GB 5135.4-2003 Automatic sprinkler fire extinguishing system Part 4: Dry alarm valve
Some standard content:
Edition). Chapter 4 and Chapter 6 of this part are mandatory, and the rest are recommended. GB5135 "Automatic sprinkler fire-extinguishing system" is currently divided into 15 parts: Part 1: Sprinkler heads; Part 2: Wet alarm valves, delay devices, hydraulic alarms; Part 3: Water mist nozzles; Part 4: Dry alarm valves; Part 5: Deluge alarm valves; Part 6: General valves; Part 7: Water flow indicators; Part 8: Additives Speed controller;
Part 9: Early suppression fast response (ESFR) sprinkler; - Part 10: Pressure switch;
Part 11: Grooved pipe fittings and assemblies; - Part 12: Sprinklers with extended coverage; - Part 13: Water curtain sprinkler;
Part 14: Pre-action device;
Part 15: Domestic sprinkler;
This part is Part 4 of GB5135.
GB 5135.4—2003
This part mainly refers to ISO6182.3 "Requirements and test methods for dry alarm valves for automatic sprinkler fire extinguishing systems" (English version, 1993). Appendix A of this part is a normative appendix, and Appendix B is an informative appendix. This part was proposed by the Ministry of Public Security of the People's Republic of China. This part is under the jurisdiction of the Second Technical Committee of the National Fire Protection Standardization Technical Committee (CSBTS/TC113/SC2). This part was drafted by the Tianjin Fire Protection Research Institute of the Ministry of Public Security. The main drafters of this part are Ling Guidao, Yang Zhenming, and Li Yi. 1 Scope
Automatic sprinkler fire extinguishing system
Part 4: Dry alarm valve
GB5135.4—2003||t t||This part of GB5135 specifies the requirements, test methods, inspection rules and markings, instruction manuals, packaging, transportation, storage, etc. for dry alarm valves of automatic sprinkler fire extinguishing systems. This part does not apply to accessories other than dry alarm valves. 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of GB5135. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part; however, parties to an agreement based on this part 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 part. GB/T528—1998 Vulcanized Rubber Rubber or thermoplastic rubber tensile stress strain properties determination GB/T3098.1 mechanical properties of fasteners bolts, screws and studs GB/T3098.2 mechanical properties of fasteners nut coarse thread GB/T3098.3 mechanical properties of fasteners set screws GB/T3287 malleable cast iron pipeline connectors
GB/T3512-2001 vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance test GB/T5720--1993 O-ring test method GB/T6031-1998 vulcanized rubber or thermoplastic rubber hardness determination (10~100IRHD) GB/T9112 steel pipe flange types and parameters 3 terms and definitions
the following terms and definitions The meaning applies to this part of GB5135. 3.1
Dry alarm valvedrypipevalve
A control valve in the automatic sprinkler fire extinguishing system. It is a one-way valve that is filled with compressed gas on its outlet side. When the gas pressure is lower than a certain value, water can automatically flow into the sprinkler system and alarm. 3.2
Differential-typedrypipevalveA type of dry alarm valve. The diameter of the air seal seat in this valve is larger than the diameter of the water seal seat, and the two seal seats are separated by an intermediate chamber at atmospheric pressure.
Mechanical dry alarm valvemechanical-typedrypipe valveA type of dry alarm valve. The valve is kept in a ready state by a mechanical amplifier mechanism. 3.4
Ready condition
When the dry alarm valve is installed in the system, the outlet side of the valve is filled with gas at a predetermined pressure, and the water supply side of the valve is filled with water at a stable pressure, and there is no water flowing through the alarm valve. 1
GB5135.4—2003
Anti-reseat latch mechanism prevents the valve disc assembly of the dry alarm valve from returning to its set position after actuation. 3.6
automatic drain valve
Automatic drain valve
A normally open automatic drain valve connected to the intermediate chamber of the dry alarm valve. When the dry alarm valve is in the open position, the valve automatically closes.
Leak point
The pressure of air and water on the outlet side when the dry alarm valve starts to release water during its opening process. 3.8
trippoint
The point at which the dry alarm valve allows water to enter the sprinkler system, expressed by the inflation pressure on the outlet side and the water supply pressure on the water supply side.
differential
When the dry alarm valve is at normal water supply pressure, the inflation pressure value on the outlet side is called the differential value, which is expressed by the gauge pressure measured at the trip point.
intermediate chamber
The space separating the air seal seat and the water seal seat in the dry alarm valve. The pressure in the intermediate chamber is atmospheric pressure when the valve is in the set position. 3.11
primingwater
Water used to seal the air seal assembly and prevent the operating parts from sticking. 3.12
service pressure
The static water pressure at the valve inlet when the dry alarm valve is in the servo state. 3.13
Outlet pressure
When the dry alarm valve is in the servo state, the static water pressure at the valve outlet. 3.14
Rated working pressurerating working pressureThe allowable working pressure of the dry alarm valve in the servo state or working state. 4 Requirements
4.1 Appearance quality
The dry alarm valve should have clear markings, a smooth and clean surface, no processing defects and scratches, uniform coating, and beautiful color. 4.2 Specifications
The nominal diameters of the inlet and outlet of the dry alarm valve are 50mm, 65mm, 80mm, 100mm, 125mm, 150mm, 200mm, and 250mm. The diameter at the valve seat ring can be smaller than the nominal diameter. For the clearance requirements of the dry alarm valve, see Appendix B. 4.3 Rated working pressure
The rated working pressure of the dry alarm valve should not be less than 1.2MPa. When the dry alarm valve is used with equipment with a lower working pressure level, the inlet and outlet joints of the valve are allowed to be processed according to the lower pressure level 2
, but the rated working pressure must be marked accordingly on the valve. 4.4 Corrosion resistance of materials
GB 5135.4-2003
4.4.1 The valve body and valve cover shall be made of materials with corrosion resistance not lower than cast iron, and the corrosion resistance of the valve seat material shall be not lower than bronze. 4.4.2 Parts that are required to rotate or slide shall be made of corrosion-resistant materials such as bronze, nickel-copper alloy, brass, and austenitic stainless steel. If materials with poor corrosion resistance are used, linings made of the above-mentioned corrosion-resistant materials shall be added to the relative motion. 4.5 Valve body and valve cover
4.5.1 The joint dimensions on the valve body and valve cover shall comply with the provisions of GB/T9112 and GB/T3287. 4.5.2 The valve body shall be provided with a drain port, and the minimum nominal diameter of the drain port shall be 20mm. 4.5.3 Facilities for testing the alarm device without opening the valve shall be provided on the water supply side of the valve disc assembly of the valve body. 4.6 Parts
4.6.1 When the valve disc or valve disc assembly is fully opened, the parts shall not have permanent deformation or breakage under water impact according to the test conditions in 5.9.7 and 5.9.8.
4.6.2 When the valve is subjected to 4 times the rated working pressure, the nominal design load of the fasteners shall not be less than that specified in GB/T3098.1~GB/T3098.3.
4.6.3 The spring and diaphragm shall be able to withstand 5000 normal working cycles specified in 5.2 without breakage and damage. 4.7 Rigid non-metallic parts
4.7.1 After the rigid non-metallic parts are subjected to aging tests according to the provisions of 5.3 and 5.4, they shall not have distortion, creep, cracks or other deformation damage that hinders the normal operation of the device.
4.7.2 Dry type alarm valves assembled from parts that have undergone aging tests shall comply with 5.7 and 5.When conducting leakage and functional tests in accordance with the provisions of 9, the provisions of 4.10 and 4.12 shall be complied with.
4.8 Valve disc seals
4.8.1 The tensile stress-strain characteristics and heat aging resistance of valve disc seals shall not be lower than the following requirements: a) The minimum tensile strength is 10MPa and the minimum elongation is 300% (25mm~100mm); b) The minimum tensile strength is 15MPa and the minimum elongation is 200% (25mm~75mm); the part with a nominal size of 25mm is stretched to 75mm, held for 2min, and measured after being released for 2min. The maximum residual deformation shall not exceed 5mm;
d) The part is placed in an ozone environment at (70.0±1.5)℃ and 0.2MPa pressure for a test for 96h. The tensile strength and elongation shall not be less than 70% before the test, and the hardness change shall not be greater than 5 international hardness units; e) After the part is placed in distilled water at (97.5±2.5)℃ for 70h, its tensile strength and elongation shall not be less than 70% before the test. The volume change rate of parts shall not exceed 20%.
4.8.2 After the valve disc seal is tested in accordance with the provisions of 5.5.2, it shall not adhere to its mating surface, and the pressure required to open the valve disc assembly shall not exceed 0.035MPa. For products of the same type but different specifications, only the specification with the largest stress on the valve seat surface is allowed to be tested. 4.9 Valve body strength
The assembled dry alarm valve, with the valve disc assembly in the open position, shall be able to withstand a hydrostatic pressure of 4 times the rated working pressure (but not less than 4.8MPa) for 5 minutes without damage.
4.10 Leakage and deformation
4.10.1 The dry alarm valve shall prevent water from leaking from the water supply side of the valve to the outlet side when the valve is in the servo state, or adopt a mechanism that can drain leakage and water from the outlet side.
4.10.2 The mechanical dry alarm valve shall be able to withstand when the valve disc assembly is closed, the outlet side is inflated, and the water supply side is applied with a hydrostatic pressure of 2 times the rated working pressure, and maintained for 2 hours, without leakage, permanent deformation or damage, and shall also meet the functional requirements of 4.12. 4.10.3 The differential dry alarm valve shall be able to withstand when the valve assembly is closed, the water supply side is ventilated, and the outlet side is applied with a hydrostatic pressure of 2 times the inflation pressure in the servo state, and maintained for 5 minutes, without leakage, permanent deformation or damage. It shall also meet the functional requirements of 4.12. 4.10.4 The dry alarm valve shall be able to withstand the test specified in 5.7.5 when the valve disc assembly is open, without leakage, permanent deformation or 3
GB5135.4—2003
damage.
4.10.5 Dry alarm valves without locking mechanisms shall have no leakage, permanent deformation or damage when tested in accordance with 5.7.4. 4.10.6 Dry alarm valves that pass the tests in accordance with the requirements of 4.10.2, 4.10.3, 4.10.4 and 4.10.5 shall comply with the functional requirements of 4.12.3 (differential dry alarm valves) or 4.12.4 (mechanical dry alarm valves) at a water supply pressure of 0.2 MPa. 4.10.7 When tested in accordance with 5.7.1, the leakage of dry alarm valves shall not exceed 3 mL/min at any pressure. 4.10.8 After the leakage and deformation tests, dry alarm valves shall comply with the functional requirements of 4.12. 4.11 Hydraulic friction losswwW.bzxz.Net
When tested in accordance with 5.8, the hydraulic friction loss shall not exceed 0.02 MPa under the water supply flow conditions given in Table 1. Table 1
Nominal diameter/mm
4.12 Function
Water supply flow/(L/min）
4.12.1 When the dry alarm valve is in the servo state, the external force should not cause the valve's actuation mechanism to be obstructed. 4.12.2 When tested in accordance with 5.9, the dry alarm valve with auxiliary accessories should be able to operate at an inlet pressure ranging from 0.14 MPa to the rated working pressure, and give an action indication through the starting mechanism or electric alarm device. The sounding time of the alarm device of the dry alarm valve without a locking mechanism should exceed 50% of the valve's actuation state time. 4.12.3 When tested in accordance with 5.9, the working differential ratio of the differential dry alarm valve should be in the range of 5:1 to 8.5:1 at an inlet pressure of 0.14 MPa, and in the range of 5:1 to 6.5:1 at higher inlet pressures. The difference between the pressure relief point and the actuation point should not exceed 0.02 MPa.
4.12.4 When tested in accordance with 5.9, the mechanical dry alarm valve shall operate within the air pressure range of 0.025MPa and 0.2MPa at an inlet pressure within the range of 0.14MPa to the rated working pressure. 4.12.5 When tested in accordance with 5.9, the dry alarm valve shall be able to activate the mechanical alarm device and the electric alarm device at an inlet pressure within the range of 0.14MPa to the rated working pressure. 4.12.6 When tested in accordance with 5.9, when the dry alarm valve with auxiliary accessories operates, it shall be able to generate a pressure of not less than 0.05MPa at the inlet of the alarm device while activating the relevant alarm device at an inlet pressure of 0.14MPa. 4.12.7 If the dry alarm valve requires bottom water to seal the base, facilities for adding bottom water should be provided. 4.12.8 The dry alarm valve should be provided with one or more orifices to prevent water accumulation and check the water level. 4.12.9 Dry alarm valves shall have facilities for testing the alarm device without opening the valve. 4.12.10 There shall be facilities for automatically draining water between the alarm stop valve and the alarm. Differential dry alarm valves shall have facilities for draining water from the intermediate chamber and for preventing the formation of a local vacuum between the upper and lower sealing elements of the valve disc assembly. 4.12.12 Dry alarm valves shall have facilities for causing the alarm device to sound an audible alarm when water enters the pipeline on the outlet side and reaches a height of more than 0.5 m above the valve disc assembly. 4.12.13 The automatic drain valve in the intermediate chamber of the dry alarm valve shall be closed under the condition that the water flow pressure is not greater than 40.14 MPa within the flow range of 0.13 L/s to 0.63 I./s.
GB 5135.4-2003
4.12.14 The automatic drain valve of the intermediate chamber of the dry alarm valve should remain closed during the discharge of water on the outlet side and should open at a pressure within the pressure range of 0.0035MPa to 0.14MPa. 4.12.15 In the rated working pressure range of 0.14MPa to 1.20MPa, if the differential ratio of the valve disc assembly exceeds 1.16 by measuring the pressure balance between the upper and lower surfaces of the valve disc assembly, a locking mechanism should be provided to prevent the valve from resetting after starting. 4.13 Fire resistance
When the valve body and valve cover are made of metal materials or non-metallic materials with a melting point below 800℃, the water-filled dry alarm valve should be able to withstand a fire resistance test at 800℃ for 15min. After the test, the valve disc assembly should be able to open freely, and the valve body should be able to withstand a hydrostatic pressure of 2 times the rated working pressure for 2min without permanent deformation or damage. 5 Test methods
5.1 Appearance inspection
Use measuring tools and visual inspection to inspect the specifications, materials, components, appearance marks, etc. of the dry alarm valve, which shall comply with the provisions of 4.1 to 4.5. 5.2 Working cycle test
The spring and diaphragm of the valve disc assembly shall be able to withstand 5000 normal working cycles, and the period of each cycle shall be less than 10s. 5.3 Air aging test of non-metallic parts
5.3.1 Place the rigid non-metallic part samples in the air aging test chamber. The samples shall not contact each other or the wall of the test chamber. The stress applied to the samples and the contact materials shall be the same as the sample in use. 5.3.2 The test temperature is (120±2)℃ and the test time is 180d. If the sample cannot withstand the above temperature and softens and deforms, it is allowed to conduct an extended aging test at a lower temperature. The test duration is calculated according to formula (1). D = 737 000 e-0. 069 3 1
Wherein:
D - test duration, in days (d); t - test temperature, in degrees Celsius (°C); e = 2. 718 3.
5.3.3 After the aging test, take out the sample and cool it in an air environment at (23 ± 2)°C for 24 h. The test results shall comply with the provisions of 4.7.1. 5.4 Warm water aging test for non-metallic parts
5.4.1 Place the rigid non-metallic part sample in tap water heated to 87°C for 180 days. If the sample cannot withstand the above temperature and softens and deforms, it is allowed to carry out an extended aging test at a lower temperature (but not less than 70°C). The test duration is calculated according to formula (2).
D 74 857 e-0. 069 3
Wherein:
D Test duration,The unit is day (d);
t--test temperature, the unit is Celsius (℃) e=2.7183.
5.4.2 After the aging test, take out the sample for inspection, and the test results shall comply with the provisions of 4.7.1. 5.5 Valve disc seal test
5.5.1 The determination of tensile stress-strain characteristics, accelerated aging and heat resistance tests of valve disc seals shall be carried out in accordance with the provisions of GB/T528, GB/T3512 and GB/T6031.
The physical property test of O-ring shall be carried out in accordance with the provisions of GB/T5720, and the test results shall comply with the provisions of 4.8.1. 5.5.2 The valve disc assembly is in the closed position, and a static water pressure of 0.35 MPa is applied to the valve outlet side. The valve water supply side is maintained at atmospheric pressure. The water temperature is maintained at (87 ± 2) °C by immersion or other heating methods. The test is continued for 90 days. After the test, the accumulated water on the valve outlet side is drained and cooled to (21 ± 4) °C. The valve outlet side is at atmospheric pressure. The valve water supply side is slowly pressurized to make the valve disc assembly leave the valve seat. The adhesion of the valve disc seal and the pressure on the valve water supply side shall comply with the requirements of 4.8.2.
5.6 Valve body strength test
The assembled dry alarm valve is installed on the test device, and the non-pressure-resistant structures and parts on the valve body are replaced with pressure-resistant structures and parts. The valve openings are blocked, the valve disc assembly is opened, water is filled to remove air, and a hydrostatic pressure of 4 times the rated working pressure (but not less than 4.8MPa) is applied to the valve, and maintained for 5 minutes. The test results meet the requirements of 4.9. 5.7 Leakage test and deformation test
5.7.1 Leakage test
When the valve disc assembly is in the closed position, the outlet side is filled with compressed air at a rate not exceeding 0.14MPa/min until the pressure reaches 0.07MPa above the starting point of the tested valve at its maximum water supply pressure. The rated working pressure is applied to the water supply side of the valve disc assembly, and the hydrostatic pressure is maintained for 6 hours. The valve leakage should meet the requirements of 4.10.7. 5.7.2 Pressurize the valve outlet side to 2 times the rated working pressure and maintain the hydrostatic pressure for 2 hours. After the test, check whether the valve components are deformed or damaged. Then the valve shall meet the functional requirements of 4.12. 5.7.3 For the leakage test of the differential dry alarm valve with a locking mechanism, when the valve disc assembly is in the closed position, fill the valve body with water from the outlet side of the valve disc assembly, pressurize to 2 times the maximum inflation pressure at a rate not exceeding 0.14MPa/min, maintain the hydrostatic pressure for 5 minutes, and check the valve leakage. It shall meet the requirements of 4.10.7. 5.7.4 For the leakage test of the mechanical dry alarm valve without a locking mechanism, when the valve disc assembly is in the closed position, fill the valve body with water from the outlet side of the valve disc assembly, pressurize to 2 times the rated working pressure, maintain the hydrostatic pressure for 5 minutes, and meet the requirements of 4.10.5. 5.7.5 Valve body leakage test
The assembled dry alarm valve is installed on the test device, the valve openings are closed, the valve disc assembly is opened, water is filled to exclude air, and a static water pressure of 2 times the rated working pressure is added to the valve for 5 minutes. The test results should meet the requirements of 4.10.4. 5.8 Hydraulic friction loss test
5.8.1 The hydraulic friction loss test adopts this test method (this method is an arbitration method) or the test method in Appendix A. 5.8.2The dry alarm valve is installed in the test pipeline shown in Figure 1. The distance h3-2 between the pressure holes on both sides of the valve is equal to the distance h2-1 between the pressure holes in the straight pipe section. The pipe diameters are the same. The flow measurement and pressure difference measurement accuracy are not less than 2%. 5.8.3 Adjust the water supply device so that the water flow through the dry valve meets the specified conditions described in Table 1. The pressure difference △P32 between h3-2 and the pressure difference △P21 between h2-1 are measured by the pressure difference measuring device at the same time. The hydraulic friction loss △P of the dry alarm valve is calculated by formula (3): AP = △P32 —△P21
△P should comply with the provisions of 4.11.
5.9 Functional test
5.9.1 Test device
(3)
The functional test of the dry alarm valve is carried out on the test device shown in Figure 1. The device includes a water supply system, an air supply system, an inlet pressure measuring instrument, an alarm pipeline control valve, a drainage device, a valve outlet side water discharge device, etc. The measurement accuracy of pressure, flow and pressure difference shall not be less than ±2%.
5.9.2 Make the dry alarm valve withstand a series of functional tests with water pressures ranging from 0.04MPa, 0.14MPa, 0.20MPa to the rated working pressure, with a step difference of 0.10MPa.
5.9.3 Each time the test is conducted, the valve disc assembly, valve seat and other moving parts shall be cleaned, the valve shall be in the servo state, and the dry alarm valve shall be opened under normal working conditions.
Alarm valve;
Alarm port;
S-control valve;
Control valve;
Control valve (quick opening type);
1, 2, 3 are pressure taking holes.
The following pressures shall be recorded during the test:
Water supply pressure;
Air pressure in the system at the initial stage;
Pressure at the valve pressure relief point;
Pressure at the valve start point;
Pressure at the alarm port.
U- differential pressure measuring instrument,
differential pressure measuring instrument;
flow measuring device with an accuracy of ±2%;
distance between the pressure holes on both sides of the alarm valve;
distance between the two pressure holes in the straight pipe section:
Figure 1 Functional test layout
5.9.5 Calculate and record the test data to obtain the differential value of the differential dry alarm valve. 5.9.6 After each test, the relative position of the valve disc assembly and the anti-reset locking mechanism must be observed. 5.9.7 Anti-reset test
GB 5135.4—2003
5.9.7.1 Install the valve in the system pipeline according to the normal installation position, install a quick-opening valve with a nominal diameter of 150mm according to Figure 2, and use a @150mm pipe to open to the atmosphere. Connect the valve to a water storage tank with a volume of not less than 1.9m3 using a pipe larger than the nominal diameter of the valve.
5.9.7.2 Place the disc assembly of the tested valve in the open position and fill the system with water, excluding the 1.9m2 water storage tank. Add water and air to the system according to the values given in Table 2. Before each test, exhaust the air in the quick-opening valve and the dry alarm water supply side pipeline. 5.9.7.3 Under each condition listed in Table 2, close the water supply valve and start the quick-opening valve to allow water to flow through the disc assembly of the tested valve.
GB 5135.4—2003
Operating pressure/MPa
Percentage of water volume in water storage tank/%
5.9.7.4 Check whether the disc assembly of the tested valve has returned to the servo state position and whether there is any damage, cracking, delamination or other damage. 5.9.7.5 Verify other functions of the valve.
Water supply
(See Table 1)
D150mm quick
opening valve
Pressure gauge
Tested dry alarm valve
Figure 2 Schematic diagram of anti-reset test device
5.9.8 Quick release test
5.9.8.1 The outlet side and water supply side of the valve flap assembly of the tested valve are respectively filled with air with twice the maximum inflation pressure, and shall not be less than 0.69MPa. The volume on the water supply side of the valve is (1.5±0.2)m2. The valve under test is started by a Φ50mm quick opening valve on the valve outlet side.
5.9.8.2 Check the valve flap assembly and valve to determine whether there is any damage, cracking, delamination or other damage. 5.10 Fire resistance test
5.10.1 The fire resistance test of dry alarm valve is carried out on the test device shown in Figure 3. The device includes a water supply system, a flow measuring instrument, a temperature measuring instrument, etc.
A temperature measuring thermocouple is installed on the horizontal plane containing the valve axis. The distance from the temperature measuring point to the two flanges is equal and the distance from the valve surface is 10mm. The oil pan area is not less than 1m.
5.10.2 Install the dry alarm valve horizontally on the test device, remove the external accessories of the valve, the valve flap assembly of the mechanical dry alarm valve should not be locked, and the valve flap assembly of the differential dry alarm valve should be locked or plugged to keep the valve flap assembly open, block the openings on the valve body, fill the valve and pipeline with water, and exclude air.
Ignite the oil pan directly below the test valve, so that the average temperature of the space around the valve is maintained at 800℃~900℃ for 15min. After reaching the duration, immediately extinguish the oil pan fire. After 1min, pass water in the test pipeline at a flow rate of 100L/min for 1min. The test results should meet the requirements of 4.13.
A, B-control valve.
6 Inspection rules
Tested valve
Thermoelectric false
:00-0b0:0s!
Figure 3 Fire resistance test layout
Product manufacturing units should formulate and comply with quality management procedures to ensure that each batch of products complies with the provisions of this part. 6.1 Inspection classification
6.1.1 Factory inspection
Dry alarm valves should be tested in accordance with the provisions of 5.1, 5.7 and 5.9 before leaving the factory. 6.1.2 Type inspection
Type inspection should be carried out in any of the following situations, and the items of type inspection are all the items in Chapter 4. a) When a new product is put into production;
GB 5135.42003
After formal production, when any of the product's structure, materials, processes, and important components has a major change that may affect product performance;
When a product is stopped for more than one year and then resumes production;c)
d) When a product is transferred to another factory for production or relocated to another place;e) When the national quality supervision agency or management department proposes a type inspection requirement. 6.2 Batch
Products of the same model and specification assembled or produced by the same process, the same materials and accessories are considered a batch. 6.3 Sampling
A random sampling method is used, and the minimum sampling quantity is not less than 2 units. 6.4 Test procedure
The test procedure for dry alarm valves shall be carried out in accordance with Figure 4. 6.5 Determination of test results
If all 5.1 to 5.10 of this part are qualified, the batch of products shall be judged as qualified products. If one of the items in 5.7 and 5.9 of this part fails, the batch of products shall be judged as unqualified products. If the remaining items fail, double sampling inspection is allowed. If there is still one unqualified item, the batch of products shall be judged as unqualified products. 7 Marking and instruction manual
7.1 Marking
Dry alarm valves shall have permanent and clear markings, which shall at least include: product name, specification model, rated working pressure, water flow direction mark, manufacturer name or trademark, production date and product number, etc. 7.2 Instruction manual
GB 5135.4—2003
Dry alarm valves shall be accompanied by instruction manuals in their packaging, which shall at least include product name, specification model, environmental conditions for use, environmental conditions for storage, production date, standards based on production, necessary use parameters, installation and operation instructions and installation diagrams, precautions, manufacturer's name, address and contact information, etc. 8 Packaging, transportation and storage
8.1 Packaging
8.1.1 The dry alarm valve should be fixed separately in the packaging box. 8.1.2 The product packaging should be accompanied by the instruction manual and certificate of conformity. 8.1.3 The placement direction, stacking limit, storage protection conditions, etc. should be marked on the outside of the packaging box. 5.15.25.75.95.85.65.10
-Appearance inspection:
Working cycle test,
5.3—Air aging test,
Warm water aging test;
Valve disc seal test;
Valve body strength test,
5.7——Leakage and deformation test;
5.8—Hydraulic friction loss test;
Function test;
5. 10-—Fire resistance test.
Figure 4 Dry alarm valve test procedure
8.2 Transportation
Dry alarm valves should be protected from rain and shock during transportation, and should be protected from impact during loading and unloading. 8.3 Storage
Dry alarm valves should be stored in a ventilated and dry warehouse, and should not be stored together with corrosive substances. The storage temperature should be 10℃～+40℃. 10
Appendix A
(Normative Appendix)
Hydraulic resistance loss test method
GB5135.4—2003
A.1 Use a calibrated standard nozzle to ensure that the water flow rate in the test pipeline is 4.5m/s. The pressure tapping ports of the differential pressure measuring instrument are respectively set at the outlet side and water supply side of the valve under test. The accuracy of differential pressure measurement and pressure measurement before the nozzle should not be less than ±2%. A.2 Adjust the pressure before the nozzle to keep the water flow velocity in the test pipeline at 4.5m/s, and directly measure the total pressure loss of the test pipeline between the two pressure ports of the dry alarm valve from the pressure difference measuring instrument. A.3 Replace the valve under test with a straight pipe section of the same nominal diameter, and measure the pressure loss of the test pipeline between the two pressure ports at the same flow rate from the pressure difference measuring instrument.
A.4 Subtract the pressure loss of the test pipeline between the two pressure ports from the total pressure loss of the dry alarm valve and the test pipeline between the two pressure ports to obtain the hydraulic friction loss of the dry alarm valve.3 Storage
Dry alarm valves should be stored in a ventilated, dry warehouse, avoid storage with corrosive substances, and the storage temperature is 10℃～+40℃. 10
Appendix A
(Normative Appendix)
Hydraulic resistance loss test method
GB5135.4—2003
A.1 Use a calibrated standard nozzle to ensure that the water flow velocity in the test pipeline is 4.5m/s. The pressure tapping ports of the differential pressure measuring instrument are respectively set at the outlet side and water supply side of the tested valve. The pressure differential measurement and the pressure measurement before the nozzle should be no less than ±2%. A.2 Adjust the pressure before the nozzle to keep the water flow velocity in the test pipeline at 4.5m/s, and directly measure the total pressure loss of the test pipeline between the two pressure tapping ports of the dry alarm valve from the differential pressure measuring instrument. A.3 Use a straight pipe section with the same nominal diameter to replace the valve under test, and measure the pressure loss of the test pipeline between the two pressure ports at the same flow rate from the pressure differential measuring instrument.
A.4 Subtract the pressure loss of the test pipeline between the two pressure ports from the total pressure loss of the dry alarm valve and the test pipeline between the two pressure ports to obtain the hydraulic friction loss of the dry alarm valve.3 Storage
Dry alarm valves should be stored in a ventilated, dry warehouse, avoid storage with corrosive substances, and the storage temperature is 10℃～+40℃. 10
Appendix A
(Normative Appendix)
Hydraulic resistance loss test method
GB5135.4—2003
A.1 Use a calibrated standard nozzle to ensure that the water flow velocity in the test pipeline is 4.5m/s. The pressure tapping ports of the differential pressure measuring instrument are respectively set at the outlet side and water supply side of the tested valve. The pressure differential measurement and the pressure measurement before the nozzle should be no less than ±2%. A.2 Adjust the pressure before the nozzle to keep the water flow velocity in the test pipeline at 4.5m/s, and directly measure the total pressure loss of the test pipeline between the two pressure tapping ports of the dry alarm valve from the differential pressure measuring instrument. A.3 Use a straight pipe section with the same nominal diameter to replace the valve under test, and measure the pressure loss of the test pipeline between the two pressure ports at the same flow rate from the pressure differential measuring instrument.
A.4 Subtract the pressure loss of the test pipeline between the two pressure ports from the total pressure loss of the dry alarm valve and the test pipeline between the two pressure ports to obtain the hydraulic friction loss of the dry alarm valve.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.