This standard specifies the requirements, test methods, and determination of the number of static pressure life tests for industrial gate valves. JB/T 8858-2004 Gate Valve Static Pressure Life Test Procedure JB/T8858-2004 Standard download decompression password: www.bzxz.net

ICS23.060.30
Mechanical Industry Standard of the People's Republic of China
JB/T 8858—2004
Replaces JB/T885-8—1999
Static Pressure Life Test Procedure
Gate valve-potential pressure lifetest regulation2004-03-12 Issued
2004-08-01 Implementation
National Development and Reform Commission of the People's Republic of China, issued by the China Council for the Promotion of International Trade
Current normative document
Terms and definitions
Test method
Determination of the recommended pressure life test item..
. Final test
6.2 Static [E left emperor test number
Appendix 4 (performance test record
Figure 1 Static service life test system
Table 4.1 Gate static pressure life test performance record
JB/T8858-2004
JB/T885B-2004
The performance of the static pressure life test procedure is carried out. This standard is compared with JB 8858·1999 for B gate valves 88.58-1999. The main changes are as follows:
The scope of use of the standard is increased , applicable to the static pressure life test of various valves: added reference standards:
modified the requirements of the valve opening range, test pressure, test pressure difference, torque control, etc. in the test requirements: supplemented the operation adjustment of the test method, etc. This standard replaces IB/TRR581999.
Appendix A of this standard is an informative appendix.
This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Valve Standardization Technical Committee (SACITC18B): The drafting unit of this standard is the United General Machinery Research Institute. The main drafters of this standard: Wang Xiaogou, Liu Xiaochun, Zheng Qinglun: The version of this standard represents: JB/243-1985, JB/T8858-1999.1 Scope
Gate valve static pressure life test procedure
JB/T88582004
This standard specifies the requirements and test methods for the static pressure life test of industrial gate valves, and the determination of the number of static pressure life tests. This standard applies to the static life test of interchangeable gate valves, parallel gate valves, and double gate valves with a nominal pressure of 42.0MPa. 2 Normative references
The clauses in the following documents are cited in this standard and are the subject of this standard. For any referenced document with a specified date, all subsequent amendments (excluding the content of the error) or revisions are not applicable to the technical standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T13927-1992 General valve pressure test (ISO5208:1982) JB9092-1 Inspection and testing of gates
3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Potential pressure life test Under laboratory conditions, the valve is subjected to medium pressure and is tested for cyclic operation from full open to full closed. 3.2
Number of static pressure life test The total number of opening and closing cycles during which the valve can maintain the required performance in the static pressure life test. 4 Requirements
4.1 The sealing performance of the gate valve that needs to undergo static pressure life test shall comply with the provisions of GB/T13927 or B/T9092. 4.2 Principle of the test system for static pressure life test As shown in the figure,
Reciprocating system: 2-
Pressure gauge: 3-
Pressure tightness: 4-
- Water system valve 5-
Air system room:
- Pressure gauge before valve:
?- Cap motor hook: 8-Tested door: Rear pressure: 10 Rear scraper: 11-Pressure relief valve 1 Principle of static pressure life test system
r88562004
43 The test medium is water at normal temperature, and air is required to be used as the test weak medium. The design of the valve's differential control test is as follows: 4.4 For the gate that can be operated in different ways, when conducting a static pressure life test, the operating device it is equipped with should be tested with the door closed. For the manual lifting function of the wheel with a control belt or the wheel reduction mechanism, the hand wheel of the wind should be driven by the worm gear reduction mechanism. For the wheel: in the electric, pneumatic or other electric and pneumatic linkage device driven gate test, the valve with its equipped action drive device should be tested according to the 4.5 pressure life test, from the full closure to the starting point, the door opening degree reaches 9 degrees. 4.6 pressure life test, from the opening position to the closing process, the body cavity is filled with medium and pressurized, the uniform pressure is 90% [008] of the nominal pressure of the gate design pressure: when the gate reaches the closing position, the outlet side of the gate test will release the medium pressure. The gate valve can be tested! For each small opening, when the rated pressure difference requirement is increased, the rated pressure difference test stop 4.7 test shall be used during the test. Except for the flat plate gate, the valve shall be closed with the standard operating torque. The maximum opening and closing torque of the flat seal shall be used as the standard when the sealing performance is guaranteed. The force of the dynamic support shall not exceed the maximum force that the dynamic wheel equipped with the test can produce or the operating force specified in the product standard. The operating torque of the flat plate seal required for the change shall be based on the operating force when the belt is opened. The driving force is reduced by +%. 4.9 The static pressure life test should be carried out carefully to determine the characteristics of the paired materials. Each valve should be cycled 200-30 times to test the sealing performance and operating torque. After the sealing performance is qualified, continue the test; for manually operated gate valves, the operating torque can be adjusted if the valve is operated with other optional equipment. For gate valves operated with other optional equipment, it cannot be adjusted. 4.10 When the valve has installation and flow requirements, it should be installed according to the required installation and flow direction. 4.11. The record of the number of static life tests is recorded by using the signal provided by the life test machine and the operating switch driven by electric, hydraulic, pneumatic or other electric and pneumatic linkage devices, and using an electric meter to record. 5 Test method
5.! Fix the valve in the direction and installation direction of the valve to be tested. 2 Under the condition of 10D pressure difference between the medium pressure and the nominal pressure (rated pressure difference), measure the maximum operating torque when opening and closing the valve, test three times, and take the maximum value. 5.3 According to the torque measured in 5.2, adjust the control torque of the weak-acting mechanism or the output torque to meet the closing and closing requirements of the gate valve, and meet the sealing performance requirements after the sealing performance test. For flat gates with flat seals, in addition to adjusting the operating torque, the closing position is also adjusted. 5.4 After the starter cycle is 20K-300 times, check the leakage before the seal. If the operating torque changes, the drive torque should be adjusted in time to meet the sealing requirements. When the operating force increases to the point where the handwheel of the gate cannot be operated, stop the test. 6 Determination of the number of static pressure life tests
6.1 Termination of test
The test should be terminated when a jam occurs: a) During the sealing test, the sealing performance fails to meet the standard requirements; b) The test piece cannot maintain sealing, and the valve stem, valve stem, butterfly nut and other parts are not lubricated, and the valve cannot be normally closed. The opening and closing operating forces change significantly, which does not meet the requirements of 4.5 of this standard.
6.2 Number of static pressure life tests
G.2.1 After meeting the required number of tests, the performance of the valve meets the standard requirements. This number of tests is the number of static pressure life tests. 6.2.2 If any unexpected performance failure to meet the standard occurs during the test, the previous inspection shall be terminated and the corresponding number of opening and closing cycles shall be the static life test times.
Product price
Product name
Nominal strength
Appendix A
(Material quality record)
Test recordwww.bzxz.net
Table 1 Static pressure life test data record Model, specification||tt ||Sealing test ratio
Before the test: Use the operating mechanism to operate the sealing performance test standard ()
Static part
Test person:
MNext, start the operating force year
Sealing and performance conditions
Test record"
Operating torque
Description of other parts
JB/FBBS82D04
Push change E purchase
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