Some standard content:
JB/T9092—1999
This standard is a revision of ZBJ16006-90 "Testing and Inspection of Valves". Compared with ZBJ16006-90, the main technical differences between this standard and ZBJ16006-90 are as follows:
1: The name of the standard is changed to "Inspection and Testing of Valves", 2. The terms "single-way seal and double-way seal" are added; 3. The provisions of the "necessary tests" of valves are separately stipulated according to the nominal pressure and nominal diameter; 4. The test items of gate valves and stop valves are separately stipulated; 5. The minimum duration of the shell test and seal test of butterfly valves has been modified to be consistent with other valves; 6. The minimum duration of the seal test on the valve has been modified; 7. The maximum allowable leakage of the seal test has been modified according to the requirements of API598-96; 8. The test method of the low-pressure seal test has been modified. This standard replaces ZBJ16006-90 from the date of implementation. This standard is proposed and managed by the National Valve Standardization Technical Committee. The drafting units of this standard: Hefei General Machinery Research Institute, Shanghai General Machinery Technology Research Institute. The main drafters of this standard: Wang Xiaogou, Song Zhongrong, Shi Jianhong. 719
1 Scope
Mechanical Industry Standards of the People's Republic of China
Valve inspection and testing
Valve inspection and testing This standard specifies the inspection and pressure test requirements of valves. 21999
JB/T 9092
Replaces ZBJ16006-90
This standard applies to the inspection and pressure test of gate valves, stop valves, plug valves, ball valves, check valves and butterfly valves with metal sealing pairs, elastic sealing pairs and non-metallic sealing pairs (such as ceramics). It can also be applied to other types of valves with the consent of both the supplier and the buyer. Elastic sealing pairs refer to:
(1) Soft sealing pairs, sealing pairs composed of solid and semi-solid greases (such as oil-sealed plug valves); (2) Sealing pairs composed of non-metallic and metallic materials; (3) Other types of sealing pairs with elastic sealing leakage rates specified in Table 3. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. JB/T7927—1999 Appearance quality requirements for valve castings 3 Technical 3.1 Single-sided seal After the valve is closed, the medium must enter from one direction at both ends of the valve, and the valve sealing pair can maintain a seal. 3.2 Bidirectional seal No matter from which direction the medium enters from both ends of the valve, the valve sealing pair can maintain a seal after the valve is closed. 4 Inspection 4.1 Inspection in the valve manufacturing plant If the buyer stipulates in the order contract that the valve needs to be inspected at the manufacturer, the buyer's inspector may enter the factory at any time during the manufacturing of the ordered valve for inspection. 4.2 Inspection outside the valve manufacturer If the buyer stipulates that the inspection includes shell parts manufactured outside the valve manufacturer, these parts should be inspected by the buyer's inspector at their original manufacturer. 4.3 Inspection notice When the buyer requires inspection, the valve manufacturer shall notify the buyer at the address listed in the order contract 7 days before the inspection according to the required test items. If inspection is required outside the valve manufacturer, the manufacturer shall also notify the buyer 7 days in advance. 4.4 Scope of Inspection
Approved by the State Machinery Industry Bureau on July 12, 1999 720
Implementation on January 1, 2000
JB/T 9092
—1999
If no other additional items are specified in the order contract, the buyer's inspection shall be limited to the following: a) Inspect the valve during assembly using non-destructive inspection tools and methods as specified in the order contract; b) The appearance inspection of castings shall comply with the provisions of JB/T7929; c) "Required" and "Optional" pressure tests; d) Other supplementary inspections (see 4.6);
e) Review of processing records and non-destructive inspection records (including specified radiographic inspection records). Note: All inspections shall be carried out in accordance with the written procedures compiled in the relevant standards. 4.5 Inspection
4.5.1 The valve manufacturer shall conduct visual inspections on all castings of valve bodies, valve covers and seals to ensure compliance with the provisions of JB/T7927. 4.5.2 The valve manufacturer shall inspect each valve to ensure compliance with the provisions of this standard and relevant product standards. 4.6 Supplementary inspection
Other supplementary inspections shall be carried out only when specified in the order contract. The specific requirements shall be carried out in accordance with the procedures and requirements agreed upon by the buyer and the seller. The inspection shall be carried out by the manufacturer under the supervision of the buyer's inspector. 5 Pressure test
5.1 Test location
The pressure test shall be carried out by the valve manufacturer in the valve manufacturer. 5.2 Test equipment
The equipment used for pressure test shall not have any external force that affects the valve seat seal during the test. 5.3 Test requirements
5.3.1 Each valve shall be pressure tested according to the requirements of Table 1 or Table 2. 5.3.2 Valves with a nominal diameter less than or equal to 100 mm and a nominal pressure less than or equal to 25.0 MPa, and valves with a nominal diameter greater than or equal to 125 mm and a nominal pressure less than or equal to 10.0 MPa shall be tested according to Table 1. 5.3.3 Valves with a nominal diameter less than or equal to 100 mm and a nominal pressure greater than 25.0 MPa, and valves with a nominal diameter greater than or equal to 125 mm and a nominal pressure greater than 10.0 MPa shall be tested according to Table 2. Table 1 Pressure test
Test items
Upper seal
Low pressure seal
High pressure seal1
Stop valve
Required5)
Plug valve
Not applicable
Required2
Optional"
Valve type
Positive return valve
Not applicable
Select3)
Floating ball valve
Not applicable
1) All valves with upper sealing performance should be subject to upper sealing test, except bellows sealed valves. 2) For oil-sealed plug valves, high pressure sealing test is required 3) With the consent of the purchaser, the valve manufacturer may use low-pressure sealing test instead of high-pressure sealing test; 1) After the high-pressure sealing test, the sealing performance of elastic sealing valves in low-pressure working conditions may be reduced; butterfly valves and fixed ball valves
Not applicable
5) For power-driven stop valves, the test pressure of the high-pressure sealing test should be 110% of the design pressure difference used by the selected power drive device, 721
Test items
Upper seal
Low pressure seal
High pressure seal3)
Stop valve
Must1
JB/T 9092-. 1999
Table 2 Pressure test
Valve type
Plug valve
Not applicable
Check valve
Not applicable
Option 2)
Floating ball valve
Not applicable
1) All valves with upper sealing performance should be subjected to upper sealing test, except bellows sealed valves; 2) With the consent of the purchaser, the valve manufacturer may use low-pressure sealing test instead of high-pressure sealing test; 3) After the high-pressure sealing test, the sealing performance of elastic sealing valves under low-pressure conditions may be reduced; Butterfly valve and fixed ball valve
Not applicable
4) For power-driven stop valves, the test pressure of the high-pressure sealing test should be 110% of the design pressure difference used by the selected power drive device. 5.3.4 Unless otherwise specified in the order contract, for valves with upper sealing performance, the upper sealing test can be a high-pressure sealing test or a low-pressure sealing test, which is selected by the manufacturer.
5.4 High-pressure sealing test
In Tables 1 and 2, some types of valves must undergo high-pressure sealing tests, and some types of valves have optional high-pressure sealing tests, but these valves should be able to pass the high-pressure sealing test (as a test of the valve sealing structure). 5.5 Test medium
5.5.1 The test medium for shell test, high-pressure upper sealing test and high-pressure sealing test should be water, air, kerosene or non-corrosive liquid with a viscosity not higher than that of water. The temperature of the test medium shall not exceed 52°C. The test medium temperature for low-temperature valves can be specified in the order. 5.5.2 For low-pressure sealing and low-pressure upper sealing tests, the test medium should be air or inert gas. 5.5.3 When air or other gases are used for shell test, sealing test and upper sealing test, the manufacturer should adopt the correct leak detection method. When testing with water or other liquids, the air inside the valve should be removed. 5.5.4 The water used in each test may contain water-soluble oil or rust inhibitor. When the purchaser has specified, the water may contain lubricants. When testing austenitic stainless steel valves, the chloride content of the water used should not exceed 100 mg/L. 5.6 Shell test of high-pressure gas
5.6.1 When the order contract stipulates that a shell test of high-pressure gas is required, the test should be carried out after the shell liquid test and corresponding safety measures should be taken.
5.6.2 The shell test pressure of high-pressure gas is 1.1 times the maximum allowable working pressure at 38°C or as specified in the order contract. No visible leakage is allowed during the test.
5.7 Test pressure
5.7.1 The shell test pressure is 1.5 times the maximum allowable working pressure at 38°C. 5.7.2 The pressure of the high-pressure seal test and the high-pressure upper seal test is 1.1 times the maximum allowable working pressure at 38°C. 5.7.3 The low-pressure sealing test and low-pressure upper sealing test pressure are 0.4～0.7MPa. For butterfly valves specified in the user's purchase specifications, the sealing test pressure is 1.1 times the design pressure difference. 5.7.4
5.7.5 The sealing test pressure of the check valve is the nominal pressure at 38℃. 5.8 Test duration
For each test, the shortest time to maintain the test pressure shall be as specified in Table 3. 722
Valve specifications
65~150
200～300
Stop valve
JB/T 9092-·1999
3 Duration of test pressure maintenance
Maintain test pressure for the longest duration
Other valves
Guangxi seal
Positive valve
Other valves
Note: The shortest duration of test pressure maintenance refers to the minimum time to maintain the specified test pressure after the pressure of the test medium in the valve rises to the specified value. 5.9 Leakage
5.9.1 For shell test and upper seal test, no visible leakage is allowed. If the test medium is liquid, there shall be no obvious visible droplets or surface moisture. If the test medium is air or other gas, there shall be no bubble leakage. There shall be no structural damage during the test. 5.9.2 For low-pressure sealing test and high-pressure sealing test, no obvious leakage is allowed through the contact surface of the valve disc, valve seat and valve body, and there is no structural damage. During the test duration, the allowable leakage rate of the test medium through the sealing surface is shown in Table 4. Table 4 Maximum allowable leakage rate of sealing test
Valve specifications
65~150
200~300
All elastic sealing valves
Drops/min
Bubbles/min
All metal sealing valves except check valves Liquid test
Drops/min
1) For liquid test medium. 1ml. (cm2) Machine f16 Drops Gas test
Bubbles/min
Metal sealing check valve
Liquid test
Gas test
2) No leakage within the specified shortest test time (see Table 3). For liquid test, "0\ drops" means no visible leakage within each specified short test time; for gas test, "0\ bubbles" means the leakage is less than 1 bubble within each specified short test time. 3) For stop valves with a diameter greater than DN600mm, the allowable leakage should be agreed upon by both parties. 5.9.3 For valves with non-metallic sealing pairs such as ceramics, the allowable leakage rate of the sealing test should be based on The provisions of the same type and specification of metal sealing valves in Table 4,
6 Pressure test method
6.1 General requirements
6.1.1 For special structure valves (except oil-sealed plug valves) that allow emergency sealing grease to be injected into the sealing surface or packing part, the injection system should be empty and inoperative during the test. 6.1.2 When testing with liquid, the air in the cavity should be exhausted. 6.1.3 Before the shell test, the valve should not be painted or painted with other coatings that can cover surface defects (phosphorus used to protect the valve surface) Chemical treatment or similar chemical treatment, before the test, use of the permit, should not cover the defects such as pores, holes, sand holes, etc.) 6.1.4 When conducting the sealing test of gate valves, rotary valves and ball valves, the body cavity between the valve cover and the sealing should be filled with medium and pressurized to the test pressure to avoid the leakage of the seal being undetected due to the gradual filling of the medium and the pressure during the test. 6.1.5 When conducting the sealing test, no external force that affects the sealing surface leakage should be applied to both ends of the valve, and the operating torque of the "closing valve" should not exceed the closing torque designed for the valve.
6.2 Shell test
JB/T 9092--1999
6.2.1 Pressurize the installed valve body cavity, close both ends of the valve, and partially open the closure. During the test, there should be no leakage at all connections. Except for the bellows-sealed valve, the packing gland is pressed tightly enough to maintain the test pressure, so that the stuffing box part is tested. There should be no leakage at the stuffing box during the test.
6.2.2 For valves with non-adjustable stem seals (such as "O\ rings, single-layer sealing rings or similar packings), there should be no leakage at the seal during the shell test.
6.3 Valves with upper sealing performance (except bellows valves) should be subjected to upper sealing tests. During the upper sealing test, the valve ends are closed and pressure is applied to the assembled valve body cavity. The valve should be fully opened and the packing gland is loosened. This test is carried out in the shell test house. Valve manufacturing! "Valves that pass the upper sealing test should not be used as a basis for recommending that the valve add or replace packing when under pressure. 6.4 Low-pressure sealing test
6.4.1 During the test, the sealing surface should be kept clean and free of oil stains (but not applicable to valves that use lubricating oil as the main sealing function). To prevent scratches on the sealing surface, a layer of oil film not thicker than kerosene film can be applied. 6.4.2 Low-pressure sealing shall be carried out in one of the following ways: a) For valves with two-way sealing (except multi-channel valves and stop valves), pressurize each end of the closed valve in turn, and open the other end to the atmosphere to check the leakage of the sealing surface at the outlet end. For valves with one-way sealing and marked with the medium flow direction mark, pressurize at the inlet end. For stop valves, pressurize at the outlet end, pour clean water or apply soapy water or other similar solutions on the sealing surface at the valve opening, observe bubbles to check the leakage of the seat, the contact surface between the seat and the valve body, and the valve sealing pair. It can also be checked according to the test device specified in the order contract, and the leakage unit specified in the table can be converted to the supply.
b) For valves with multi-channel seals, the test medium should be introduced into the sealed channel and pressurized in turn, and the leakage rate of the inlet sealing surface should be checked from the stuffing box (no stuffing should be installed at this time) or other open channel ports. During the test, the leakage rate of the sealing surface should not exceed the leakage rate specified in the installation.
Note: For model single-disc (rigid or elastic) gate valves, the following test methods are not allowed: such as sealing the test medium on the two sealing surfaces, pouring clean water or applying soapy water on the two sealing surfaces, and other similar test methods. 6.4.3 For elastically sealed butterfly valves, whether one-way or two-way sealing, only It is necessary to perform a pressure test at the end with the most unfavorable sealing. 6.5 High-pressure sealing test
The high-pressure sealing test is the same as the low-pressure sealing test method. When the test medium is liquid, the leakage detection should be liquid 7 Valve certificate and retest
7.1 Certificate
The valve manufacturer shall provide the purchaser with a certificate proving that the valve product meets the order. 7.2 Retest
If the purchase contract does not stipulate that the purchaser shall conduct retests, the tested valves do not need to be retested. During retesting, the painted valves do not need to remove the paint. The stock valves should be cleaned before retesting and shipment.8 Test duration
For each test, the shortest time to maintain the test pressure shall be in accordance with the provisions of Table 3. 722
Valve specifications
65~150
200～300
Stop valve
JB/T 9092-·1999
3 Duration of maintaining test pressure
Maintain test pressure for the longest duration
Other valves
Wide seal
Positive valve
Other valves
Note: The shortest duration of maintaining test pressure refers to the minimum time to maintain the specified test pressure after the pressure of the test medium in the valve rises to the specified value. 5.9 Leakage
5.9.1 For shell test and upper seal test, no visible leakage is allowed. If the test medium is liquid, there shall be no obvious visible droplets or surface moisture. If the test medium is air or other gas, there should be no bubble leakage. There should be no structural damage during the test. 5.9.2 For low-pressure sealing test and high-pressure sealing test, no obvious visible leakage is allowed through the valve disc, valve seat and valve body contact surface, and there is no structural damage. During the test duration. The allowable leakage rate of the test medium through the sealing surface is shown in Table 4. Table 4 Maximum allowable leakage rate of sealing test
Valve specification
65~150
200~300
All elastic sealing valves
Drops/min
Bubble/min
All metal sealing valves except check valves Liquid test
Drops/min
1) For liquid test medium. 1ml. (cm2) Machine f16 Drops Gas test
Bubble/min
Metal sealing check valve
Liquid test
Gas test
2) No leakage within the specified shortest test time (see Table 3). For liquid test, "0\ drops" means no visible leakage within each specified short test time; for gas test, "0\ bubbles" means the leakage is less than 1 bubble within each specified short test time. 3) For stop valves with a diameter greater than DN600mm, the allowable leakage should be agreed upon by both parties. 5.9.3 For valves with non-metallic sealing pairs such as ceramics, the allowable leakage rate of the sealing test should be The provisions of the same type and specification of metal sealing valves in Table 4,
6 Pressure test method
6.1 General requirements
6.1.1 For special structure valves (except oil-sealed plug valves) that allow emergency sealing grease to be injected into the sealing surface or packing part, the injection system should be empty and inoperative during the test. 6.1.2 When testing with liquid, the air in the cavity should be exhausted. 6.1.3 Before the shell test, the valve should not be painted or painted with other coatings that can cover surface defects (phosphorus used to protect the valve surface) Chemical treatment or similar chemical treatment, before the test, use of the permit, should not cover the defects such as pores, holes, sand holes, etc.) 6.1.4 When conducting the sealing test of gate valves, rotary valves and ball valves, the body cavity between the valve cover and the sealing should be filled with medium and pressurized to the test pressure to avoid the leakage of the seal being undetected due to the gradual filling of the medium and the pressure during the test. 6.1.5 When conducting the sealing test, no external force that affects the sealing surface leakage should be applied to both ends of the valve, and the operating torque of the "closing valve" should not exceed the closing torque designed for the valve.
6.2 Shell test
JB/T 9092--1999
6.2.1 Pressurize the installed valve body cavity, close both ends of the valve, and partially open the closure. During the test, there should be no leakage at all connections. Except for the bellows-sealed valve, the packing gland is pressed tightly enough to maintain the test pressure, so that the stuffing box part is tested. There should be no leakage at the stuffing box during the test.
6.2.2 For valves with non-adjustable stem seals (such as "O\ rings, single-layer sealing rings or similar packings), there should be no leakage at the seal during the shell test.
6.3 Valves with upper sealing performance (except bellows valves) should be subjected to upper sealing tests. During the upper sealing test, the valve ends are closed and pressure is applied to the assembled valve body cavity. The valve should be fully opened and the packing gland is loosened. This test is carried out in the shell test house. Valve manufacturing! "Valves that pass the upper sealing test should not be used as a basis for recommending that the valve add or replace packing when under pressure. 6.4 Low-pressure sealing test
6.4.1 During the test, the sealing surface should be kept clean and free of oil stains (but not applicable to valves that use lubricating oil as the main sealing function). To prevent scratches on the sealing surface, a layer of oil film not thicker than kerosene film can be applied. 6.4.2 Low-pressure sealing shall be carried out in one of the following ways: a) For valves with two-way sealing (except multi-channel valves and stop valves), pressurize each end of the closed valve in turn, and open the other end to the atmosphere to check the leakage of the sealing surface at the outlet end. For valves with one-way sealing and marked with the medium flow direction mark, pressurize at the inlet end. For stop valves, pressurize at the outlet end, pour clean water or apply soapy water or other similar solutions on the sealing surface at the valve opening, observe bubbles to check the leakage of the seat, the contact surface between the seat and the valve body, and the valve sealing pair. It can also be checked according to the test device specified in the order contract, and the leakage unit specified in the table can be converted to the supply.
b) For valves with multi-channel seals, the test medium should be introduced into the sealed channel and pressurized in turn, and the leakage rate of the inlet sealing surface should be checked from the stuffing box (no stuffing should be installed at this time) or other open channel ports. During the test, the leakage rate of the sealing surface should not exceed the leakage rate specified in the installation.
Note: For model single-disc (rigid or elastic) gate valves, the following test methods are not allowed: such as sealing the test medium on the two sealing surfaces, pouring clean water or applying soapy water on the two sealing surfaces, and other similar test methods. 6.4.3 For elastically sealed butterfly valves, whether one-way or two-way sealing, only It is necessary to perform a pressure test at the end with the most unfavorable sealing. 6.5 High-pressure sealing test
The high-pressure sealing test is the same as the low-pressure sealing test method. When the test medium is liquid, the leakage detection should be liquid 7 Valve certificate and retest
7.1 Certificate
The valve manufacturer shall provide the purchaser with a certificate proving that the valve product meets the order. 7.2 Retest
If the purchase contract does not stipulate that the purchaser shall conduct retests, the tested valves do not need to be retested. During retesting, the painted valves do not need to remove the paint. The stock valves should be cleaned before retesting and shipment.8 Test duration
For each test, the minimum time to maintain the test pressure shall be in accordance with the provisions of Table 3. 722
Valve specifications
65~150
200～300
Stop valve
JB/T 9092-·1999
3 Duration of maintaining test pressure
Maintain test pressure for the longest duration
Other valves
Wide seal
Positive valve
Other valves
Note: The shortest duration of maintaining test pressure refers to the minimum time to maintain the specified test pressure after the pressure of the test medium in the valve rises to the specified value. 5.9 Leakage
5.9.1 For shell test and upper seal test, no visible leakage is allowed. If the test medium is liquid, there shall be no obvious visible droplets or surface moisture. If the test medium is air or other gas, there should be no bubble leakage. There should be no structural damage during the test. 5.9.2 For low-pressure sealing test and high-pressure sealing test, no obvious visible leakage is allowed through the valve disc, valve seat and valve body contact surface, and there is no structural damage. During the test duration. The allowable leakage rate of the test medium through the sealing surface is shown in Table 4. Table 4 Maximum allowable leakage rate of sealing test
Valve specification
65~150
200~300
All elastic sealing valves
Drops/min
Bubble/min
All metal sealing valves except check valves Liquid test
Drops/min
1) For liquid test medium. 1ml. (cm2) Machine f16 Drops Gas test
Bubble/min
Metal sealing check valve
Liquid test
Gas test
2) No leakage within the specified shortest test time (see Table 3). For liquid test, "0\ drops" means no visible leakage within each specified short test time; for gas test, "0\ bubbles" means the leakage is less than 1 bubble within each specified short test time. 3) For stop valves with a diameter greater than DN600mm, the allowable leakage should be agreed upon by both parties. 5.9.3 For valves with non-metallic sealing pairs such as ceramics, the allowable leakage rate of the sealing test should be The provisions of the same type and specification of metal sealing valves in Table 4,
6 Pressure test method
6.1 General requirements
6.1.1 For special structure valves (except oil-sealed plug valves) that allow emergency sealing grease to be injected into the sealing surface or packing part, the injection system should be empty and inoperative during the test. 6.1.2 When testing with liquid, the air in the cavity should be exhausted. 6.1.3 Before the shell test, the valve should not be painted or painted with other coatings that can cover surface defects (phosphorus used to protect the valve surface) Chemical treatment or similar chemical treatment, before the test, use of the permit, should not cover the defects such as pores, holes, sand holes, etc.) 6.1.4 When conducting the sealing test of gate valves, rotary valves and ball valves, the body cavity between the valve cover and the sealing should be filled with medium and pressurized to the test pressure to avoid the leakage of the seal being undetected due to the gradual filling of the medium and the pressure during the test. 6.1.5 When conducting the sealing test, no external force that affects the sealing surface leakage should be applied to both ends of the valve, and the operating torque of the "closing valve" should not exceed the closing torque designed for the valve.
6.2 Shell test
JB/T 9092--1999
6.2.1 Pressurize the installed valve body cavity, close both ends of the valve, and partially open the closure. During the test, there should be no leakage at all connections. Except for the bellows-sealed valve, the packing gland is pressed tightly enough to maintain the test pressure, so that the stuffing box part is tested. There should be no leakage at the stuffing box during the test.
6.2.2 For valves with non-adjustable stem seals (such as "O\ rings, single-layer sealing rings or similar packings), there should be no leakage at the seal during the shell test.
6.3 Valves with upper sealing performance (except bellows valves) should be subjected to upper sealing tests. During the upper sealing test, the valve ends are closed and pressure is applied to the assembled valve body cavity. The valve should be fully opened and the packing gland is loosened. This test is carried out in the shell test house. Valve manufacturing! "Valves that pass the upper sealing test should not be used as a basis for recommending that the valve add or replace packing when under pressure. 6.4 Low-pressure sealing test
6.4.1 During the test, the sealing surface should be kept clean and free of oil stains (but not applicable to valves that use lubricating oil as the main sealing function). To prevent scratches on the sealing surface, a layer of oil film not thicker than kerosene film can be applied. 6.4.2 Low-pressure sealing shall be carried out in one of the following ways: a) For valves with two-way sealing (except multi-channel valves and stop valves), pressurize each end of the closed valve in turn, and open the other end to the atmosphere to check the leakage of the sealing surface at the outlet end. For valves with one-way sealing and marked with the medium flow direction mark, pressurize at the inlet end. For stop valves, pressurize at the outlet end, pour clean water or apply soapy water or other similar solutions on the sealing surface at the valve opening, observe bubbles to check the leakage of the seat, the contact surface between the seat and the valve body, and the valve sealing pair. It can also be checked according to the test device specified in the order contract, and the leakage unit specified in the table can be converted to the supply.
b) For valves with multi-channel seals, the test medium should be introduced into the sealed channel and pressurized in turn, and the leakage rate of the inlet sealing surface should be checked from the stuffing box (no stuffing should be installed at this time) or other open channel ports. During the test, the leakage rate of the sealing surface should not exceed the leakage rate specified in the installation.
Note: For model single-disc (rigid or elastic) gate valves, the following test methods are not allowed: such as sealing the test medium on the two sealing surfaces, pouring clean water or applying soapy water on the two sealing surfaces, and other similar test methods. 6.4.3 For elastically sealed butterfly valves, whether one-way or two-way sealing, only It is necessary to perform a pressure test at the end with the most unfavorable sealing. 6.5 High-pressure sealing test
The high-pressure sealing test is the same as the low-pressure sealing test method. When the test medium is liquid, the leakage detection should be liquid 7 Valve certificate and retest
7.1 Certificatebzxz.net
The valve manufacturer shall provide the purchaser with a certificate proving that the valve product meets the order. 7.2 Retest
If the purchase contract does not stipulate that the purchaser shall conduct retests, the tested valves do not need to be retested. During retesting, the painted valves do not need to remove the paint. The stock valves should be cleaned before retesting and shipment.1 For special valves with special structures that allow emergency sealing grease to be injected into the sealing surface or packing part (except oil-sealed plug valves), the injection system should be empty and inoperative during the test. 6.1.2 When testing with liquid, the air in the cavity should be exhausted. 6.1.3 Before the shell test, the valve should not be painted or painted with other coatings that can cover surface defects (phosphating treatment or similar chemical treatment used to protect the valve surface should be used before the test, and should not cover defects such as pores, holes, and sand holes). 6.1.4 When conducting sealing tests on gate valves, rotary valves, and ball valves, the body cavity between the valve cover and the sealing part should be filled with medium and pressurized to the test pressure to avoid leakage of the seal due to the gradual filling of the medium and the pressure during the test. 6.1.5 When conducting sealing tests, no external force that affects the sealing surface leakage should be applied at both ends of the valve, and the operating torque of the valve should not exceed the closing torque designed for the valve.
6.2 Shell test
JB/T 9092--1999
6.2.1 Pressurize the installed valve body cavity with both ends of the valve closed and the housing closure part opened. During the test, there should be no leakage at the joints. Except for the bellows-sealed valve, the packing gland is tightened enough to maintain the test pressure, so that the stuffing box is tested. There should be no leakage at the stuffing box during the test.
6.2.2 For valves with non-adjustable stem seals (such as "O\ rings, single-layer sealing rings or similar packings), there should be no leakage at the seal during the shell test.
6.3 Valves with upper sealing performance (except bellows valves) should be subjected to upper sealing tests. During the upper sealing test, the valve ends are closed and pressure is applied to the assembled valve body cavity. The valve should be fully opened and the packing gland is loosened. This test is carried out in the shell test house. Valve manufacturing! "Valves that pass the upper sealing test should not be used as a basis for recommending that the valve add or replace packing when under pressure. 6.4 Low-pressure sealing test
6.4.1 During the test, the sealing surface should be kept clean and free of oil marks (but it is not applicable to valves that use lubricating oil as the main sealing function). To prevent scratches on the sealing surface, a layer of oil film not thicker than kerosene film can be applied. 6.4.2 Low-pressure sealing shall be carried out in one of the following ways: a) For valves with two-way sealing (except multi-channel valves and stop valves), pressurize each end of the closed valve in turn, and open the other end to the atmosphere to check the leakage of the sealing surface at the outlet end. For valves with one-way sealing and marked with the medium flow direction mark, pressurize at the inlet end. For stop valves, pressurize at the outlet end, pour clean water or apply soapy water or other similar solutions on the sealing surface at the valve opening, observe bubbles to check the leakage of the seat, the contact surface between the seat and the valve body, and the valve sealing pair. It can also be checked according to the test device specified in the order contract, and the leakage unit specified in the table is provided.
b) For valves with multi-channel seals, the test medium should be introduced into the sealed channel and pressurized in turn, and the leakage rate of the inlet sealing surface should be checked from the stuffing box (at this time, no stuffing should be installed) or other open channel ports. During the test, the leakage rate of the sealing surface should not exceed the leakage rate specified in the installation.
Note: For model single-disc (rigid or elastic) gate valves, the following test methods are not allowed: such as sealing the test medium on the two sealing surfaces, pouring clean water or applying soapy water on the two sealing surfaces, and other similar test methods. 6.4.3 For elastically sealed butterfly valves, whether one-way or two-way sealing, only It is necessary to perform a pressure test at the end with the most unfavorable sealing. 6.5 High-pressure sealing test
The high-pressure sealing test is the same as the low-pressure sealing test method. When the test medium is liquid, the leakage detection should be liquid 7 Valve certificate and retest
7.1 Certificate
The valve manufacturer shall provide the purchaser with a certificate proving that the valve product meets the order. 7.2 Retest
If the purchase contract does not stipulate that the purchaser shall conduct retests, the tested valves do not need to be retested. During retesting, the painted valves do not need to remove the paint. The stock valves should be cleaned before retesting and shipment.1 For special valves with special structures that allow emergency sealing grease to be injected into the sealing surface or packing part (except oil-sealed plug valves), the injection system should be empty and inoperative during the test. 6.1.2 When testing with liquid, the air in the cavity should be exhausted. 6.1.3 Before the shell test, the valve should not be painted or painted with other coatings that can cover surface defects (phosphating treatment or similar chemical treatment used to protect the valve surface should be used before the test, and should not cover defects such as pores, holes, and sand holes). 6.1.4 When conducting sealing tests on gate valves, rotary valves, and ball valves, the body cavity between the valve cover and the sealing part should be filled with medium and pressurized to the test pressure to avoid leakage of the seal due to the gradual filling of the medium and the pressure during the test. 6.1.5 When conducting sealing tests, no external force that affects the sealing surface leakage should be applied at both ends of the valve, and the operating torque of the valve should not exceed the closing torque designed for the valve.
6.2 Shell test
JB/T 9092--1999
6.2.1 Pressurize the installed valve body cavity with both ends of the valve closed and the housing closure part opened. During the test, there should be no leakage at the joints. Except for the bellows-sealed valve, the packing gland is tightened enough to maintain the test pressure, so that the stuffing box is tested. There should be no leakage at the stuffing box during the test.
6.2.2 For valves with non-adjustable stem seals (such as "O\ rings, single-layer sealing rings or similar packings), there should be no leakage at the seal during the shell test.
6.3 Valves with upper sealing performance (except bellows valves) should be subjected to upper sealing tests. During the upper sealing test, the valve ends are closed and pressure is applied to the assembled valve body cavity. The valve should be fully opened and the packing gland is loosened. This test is carried out in the shell test house. Valve manufacturing! "Valves that pass the upper sealing test should not be used as a basis for recommending that the valve add or replace packing when under pressure. 6.4 Low-pressure sealing test
6.4.1 During the test, the sealing surface should be kept clean and free of oil marks (but it is not applicable to valves that use lubricating oil as the main sealing function). To prevent scratches on the sealing surface, a layer of oil film not thicker than kerosene film can be applied. 6.4.2 Low-pressure sealing shall be carried out in one of the following ways: a) For valves with two-way sealing (except multi-channel valves and stop valves), pressurize each end of the closed valve in turn, and open the other end to the atmosphere to check the leakage of the sealing surface at the outlet end. For valves with one-way sealing and marked with the medium flow direction mark, pressurize at the inlet end. For stop valves, pressurize at the outlet end, pour clean water or apply soapy water or other similar solutions on the sealing surface at the valve opening, observe bubbles to check the leakage of the seat, the contact surface between the seat and the valve body, and the valve sealing pair. It can also be checked according to the test device specified in the order contract, and the leakage unit specified in the table is provided.
b) For valves with multi-channel seals, the test medium should be introduced into the sealed channel and pressurized in turn, and the leakage rate of the inlet sealing surface should be checked from the stuffing box (at this time, no stuffing should be installed) or other open channel ports. During the test, the leakage rate of the sealing surface should not exceed the leakage rate specified in the installation.
Note: For model single-disc (rigid or elastic) gate valves, the following test methods are not allowed: such as sealing the test medium on the two sealing surfaces, pouring clean water or applying soapy water on the two sealing surfaces, and other similar test methods. 6.4.3 For elastically sealed butterfly valves, whether one-way or two-way sealing, only It is necessary to perform a pressure test at the end with the most unfavorable sealing. 6.5 High-pressure sealing test
The high-pressure sealing test is the same as the low-pressure sealing test method. When the test medium is liquid, the leakage detection should be liquid 7 Valve certificate and retest
7.1 Certificate
The valve manufacturer shall provide the purchaser with a certificate proving that the valve product meets the order. 7.2 Retest
If the purchase contract does not stipulate that the purchaser shall conduct a retest, the tested valves do not need to be retested. During the retest, the painted valves do not need to remove the paint. The stock valves should be cleaned before retesting and shipment.
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