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GB/T 15382-2021 PDF in English


GB/T 15382-2021 (GB/T15382-2021, GBT 15382-2021, GBT15382-2021)
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GB/T 15382-2021: PDF in English (GBT 15382-2021)

GB/T 15382-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Replacing GB/T 15382-2009, GB/T 10879-2009
General specifications of gas cylinder valves
(ISO 10297:2014, Gas cylinders - Cylinder valves - Specification and type testing,
NEQ)
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 9
4 Basic type and structure ... 11
4.1 Basic types of valves ... 11
4.2 Main components of valve ... 12
5 Technical requirements ... 15
5.1 Material requirements ... 15
5.2 Design and process requirements ... 17
5.3 Performance requirements ... 18
6 Inspection and test methods ... 21
6.1 General principles for testing ... 21
6.2 Inspection of material mechanical properties and chemical composition ... 22
6.3 Oxygen aging resistance test ... 22
6.4 Low temperature resistance test ... 22
6.5 Inspection of connection dimensions ... 22
6.6 Pressure resistance test ... 23
6.7 Fire resistance test ... 23
6.8 Opening and closing test ... 23
6.9 Air tightness test ... 24
6.10 Vibration resistance test ... 25
6.11 Endurance test ... 25
6.12 Part integrity inspection ... 27
6.13 Mechanical impact resistance test ... 28
6.14 Oxygen pressure ignition resistance test ... 29
6.15 Valve part tightness test ... 32
6.16 Hydrochloric acid corrosion resistance test ... 33
6.17 Action test of safety pressure relief device ... 33
7 Inspection rules ... 34
7.1 Exit-factory inspection ... 34
7.2 Type test ... 35
8 Marking, packaging, transportation, storage ... 38
8.1 Marking... 38
8.2 Packaging, transportation, storage ... 39
9 Product certificate and product batch inspection quality certificate ... 39
9.1 Product certificate ... 39
9.2 Product batch inspection quality certificate ... 40
Appendix A (Normative) Residual pressure device ... 41
A.1 Type test ... 41
A.2 Inspection methods and judgment basis ... 42
General specifications of gas cylinder valves
1 Scope
This document stipulates the terms and definitions, basic types, technical requirements,
inspection and test methods, inspection rules, marking, packaging, transportation,
storage, product certificates, product batch inspection quality certificates of gas
cylinder valves.
This document is applicable to valves for compressed, liquefied, dissolved gas cylinders
(hereinafter referred to as valves), whose ambient temperature is -40 °C ~ +60 °C,
whose nominal working pressure is not greater than 35 MPa, which is transportable and
refillable.
This document does not apply to the valves for welding insulated cylinders, fire
extinguishing cylinders, vehicle cylinders, respirator cylinders, liquefied petroleum gas
cylinders, liquefied dimethyl ether cylinders, industrial non-refillable welded cylinders.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB/T 3863 Industrial oxygen
GB/T 4423 Copper and copper alloy cold-drawn rod and bar
GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight joints are
not made on the threads
GB/T 8335 Special thread for gas cylinders
GB/T 8337 Fusible plug device for gas cylinders
GB/T 13005 Terminology of gas cylinders
5.1.1.5 The liquid chlorine cylinder valve shall be made of materials resistant to
hydrochloric acid corrosion.
5.1.2 Valve body material
5.1.2.1 The valve body material shall be made of materials that will not change from
plasticity to brittleness (such as copper alloy, austenitic stainless steel, aluminum alloy,
nickel alloy, etc.), meanwhile it shall meet the design strength requirements of the valve
body. The performance of the material shall comply with corresponding national
standards.
5.1.2.2 When selecting brass material for the valve body, its copper content shall be in
the range of 57.0% ~ 65.0%, lead content shall be in the range of 0.8% ~ 1.9%, iron
content shall be ≤ 0.5%. The mechanical properties of the material shall not be lower
than those specified in GB/T 4423.
5.1.3 Operating mechanism and operating device materials
5.1.3.1 The valve operating device shall have sufficient strength and fire resistance,
which should be made of aluminum alloy material.
5.1.3.2 The materials of the valve stem, valve, connecting plate shall have sufficient
strength and corrosion resistance. The valve stem used for liquid chlorine medium shall
be made of stainless steel material, that is resistant to hydrochloric acid corrosion, or
materials with higher resistance to hydrochloric acid corrosion.
5.1.3.3 The spring placed inside the valve should be made of corrosion-resistant
stainless steel.
5.1.3.4 The diaphragm piece of the diaphragm valve shall be made of elastic stainless
steel material, or a combination of media corrosion-resistant material and elastic
stainless steel material.
5.1.4 Rubber seal materials
5.1.4.1 Oxygen aging resistance
The rubber seal shall be kept in oxygen at a pressure of (2.3 ± 0.2) MPa and a
temperature of (70 ± 5) °C for 96 hours; there shall be no visible cracks or aging.
5.1.4.2 Low temperature resistance
The rubber seal shall be kept in air at a temperature of (-40 ± 2) °C for 24 hours; there
shall have no cracks or other damage.
5.1.5 Non-metallic materials in contact with oxygen or strongly oxidizing gases
5.1.5.1 Non-metallic seals, lubricants, sealants and other materials that come into
contact with oxygen or strongly oxidizing gases shall be flame retardant.
5.1.5.2 Non-metallic seals, lubricants, sealants and other materials that come into
contact with oxygen or strongly oxidizing gases should be subjected to self-ignition
tests, according to the test methods specified in GB/T 31481. Their self-ignition
temperature shall be at least 100 °C higher than the maximum operating temperature.
Note: The maximum operating temperature refers to the highest temperature the valve may be
at during use (such as when inflated).
5.1.5.3 Non-metallic seals, lubricants, sealants and other materials that come into
contact with oxygen or strongly oxidizing gases shall be subjected to pressure impact
tests under pvt pressure, according to the test methods specified in GB/T 31481; it shall
not react with oxygen.
5.1.6 Materials of safety pressure relief devices
The material of the safety pressure relief device shall comply with the requirements of
GB/T 8337 or GB/T 16918.
5.2 Design and process requirements
5.2.1 The valve shall be able to operate normally within the ambient temperature range
of -40 °C ~ +60 °C. This temperature range can be appropriately expanded for a short
period of time (such as inflating). When the cylinder is used for a long time at a lower
or higher temperature, the supplier and the buyer shall sign an agreement and make it
clear in the supplier's instructions.
5.2.2 The manufacturer shall specify the design service life of the valve, which is at
least one periodic inspection cycle of the gas cylinder.
5.2.3 The valve’s inlet and outlet should adopt connection types and sizes that comply
with the provisions of GB/T 8335 and GB/T 15383. The accuracy of the valve's inlet
and outlet connection threads shall meet the requirements of GB/T 8335, GB/T 197,
GB/T 7307. The accuracy of metric threads shall at least meet the requirements of 6 g
and 6 H; the accuracy of cylindrical pipe threads shall at least meet the requirements of
Class B.
5.2.4 The closing direction of the valve shall be designed to be clockwise, so that the
valve can be opened or closed flexibly regardless of whether there is pressure in the
cylinder. For valves used for oxygen or strongly oxidizing gases, they shall be rotated
more than circle when fully opened.
5.2.5 For valves that use a handle to open and close, the maximum length of the handle
shall ensure that the valve stem and the sealing surface of the valve are not damaged,
meanwhile an adjustable wrench should not be used.
5.3.10 Valve tightness
Use a non-metallic sealed dissolved acetylene cylinder valve. Burn the valve seal with
a flame. Install the valve parts into the valve without any cleaning. Close the valve with
a torque of not more than 12 Nꞏm. The leak rate under the pressure of pvt shall not be
greater than 50 cm3/h.
5.3.11 Hydrochloric acid corrosion resistance
The valve stem of the liquid chlorine cylinder valve shall undergo a hydrochloric acid
corrosion resistance test. After the test, close the valve using a torque of To. The valve
shall have no leakage at room temperature and pvt pressure; the valve stem shall not
break.
5.3.12 Operation performance of safety pressure relief device
5.3.12.1 The design of the safety pressure relief device of the valve shall comply with
the requirements of GB/T 33215. A bursting disc device, a fusible alloy plug device, a
bursting disc-fusible alloy plug composite device or a spring-type pressure relief device
can be installed as needed.
5.3.12.2 The operating pressure of the bursting disc device, the setting pressure and the
reseating pressure of the spring-type pressure relief device shall comply with the
provisions of GB/T 33215.
5.3.12.3 The operating temperature of the fusible alloy plug device should be as follows:
a) , used for valves with nominal working pressure not greater than 3.45
MPa;
b) (100 ± 5) °C, used to dissolve acetylene cylinder valve;
c) (110 ± 5) °C, used for valves with nominal working pressure greater than 3.45
MPa and not greater than 35 MPa.
5.3.12.4 The operating pressure and operating temperature of the bursting disc-fusible
alloy plug composite device shall comply with the provisions of 5.3.12.2 and 5.3.12.3.
6 Inspection and test methods
6.1 General principles for testing
6.1.1 Test environment
Unless there are other special requirements, the test shall be conducted at room
temperature of 15 °C to 30 °C; the lab shall be kept shockproof, moisture-proof,
anticorrosive, well ventilated.
6.1.2 Test medium
In the absence of other special requirements, except for the pressure resistance test
medium which is clean water, the other test media are pure dry air or nitrogen.
6.1.3 Pressure gauge for testing
The accuracy of the pressure gauge used for testing shall be no less than level 1.6; the
range of the pressure gauge shall be 1.5 ~ 2 times the test pressure.
6.2 Inspection of material mechanical properties and chemical
composition
The mechanical properties of the valve body material shall be tested in accordance with
the provisions of GB/T 228.1; the chemical composition should be tested using
spectroscopic methods, to check whether the mechanical properties and chemical
composition of the material comply with the provisions of 5.1.2.1 and 5.1.2.2. Where
dispute arbitration occurs, the inspection methods specified in the corresponding
material standards shall be used.
6.3 Oxygen aging resistance test
Place 5 rubber seals in the aging test device. Remove the air in the device. Fill it with
oxygen at a purity of ≥ 99.5%. Bring the pressure to (2.3 ± 0.2) MPa. Raise the
temperature to (70 ± 5) °C. Take it out after keeping it for 96 hours. Visually check
whether the result meets the requirements of 5.1.4.1.
6.4 Low temperature resistance test
Place the 5 rubber seals in a test chamber at a temperature of (-40 ± 2) °C. After keeping
it for 24 hours, take it out and put it on a steel mandrel which has a diameter 1.2 times
the inner diameter of the rubber seal. Visually inspect, to see whether the results comply
with the provisions of 5.1.4.2.
6.5 Inspection of connection dimensions
6.5.1 The connection size of the valve's air inlet and outlet shall be tested using
measuring tools that meet the corresponding thread and dimensional accuracy
requirements; check whether the results comply with the provisions of 5.2.3.
Install the valve on the test device. Slowly increase the closing torque, until the valve
mechanically fails. Then disassemble the valve. Check whether each part meets the
requirements of 5.3.3.3. Install the valve on the test device. Slowly increase the opening
torque, until the valve mechanically fails. Disassemble the valve. Check whether each
part meets the requirements of 5.3.3.3.
6.8.3.2 Failure torque test of handle valve
Install the valve on the test device. Slowly increase the closing torque, until the valve
mechanically fails. Record the torque. Then install the other valve on the test device.
Slowly increase the opening torque, until the valve mechanically fails. Record the
torque. Take the smaller of the two as the Tf value of the valve. This value is used to
calculate the To and Te values in Table 1.
6.9 Air tightness test
6.9.1 Air tightness test for type test
6.9.1.1 Overview
The air tightness test during type test shall be carried out according to the following
requirements:
a) The valve shall undergo external air tightness test, internal air tightness test,
vacuum air tightness test (if required);
b) The valve shall be tested, item by item at the temperatures (room temperature, -
40 °C, -20 °C, +65 °C) and test sequence specified in Table 4, at the pressure
specified in Table 2;
c) When the valve is tested for low-temperature and high-temperature air tightness,
it shall be kept at this temperature for at least 30 minutes, to ensure that the valve
has reached the corresponding temperature before leak testing;
d) When the valve is undergoing a -20 °C air tightness test, it can be directly raised
from -40 °C to -20 °C. There is no need to first raise to room temperature and
then cool down;
e) After the valve has passed the -20 °C air tightness test, it shall be raised to room
temperature through natural conditions, then raised to +65 °C;
f) When conducting the internal air tightness test at -40 °C, the valve shall be closed
first at room temperature and then cooled down.
6.9.1.2 External air tightness test
Install the valve on the test device. Block the air outlet of the valve. Open the valve to
any open state at the torque of Te, start (use Te, end after the endurance test) in Table 1.
Apply the pressure specified in Table 2 from the air inlet of the valve. Maintain the
specified pressure for at least 1 minute. Check whether the result meets the requirements
of 5.3.4.
Note: The air tightness test during exit-factory inspection is only conducted at room temperature;
the test pressures are pvt, 0.05 MPa, vacuum degree (if required), respectively.
6.9.1.3 Internal air tightness test
Install the valve on the test device. Close the valve using the torque of Te, start in Table 1
(use Te, end after the endurance test). Remove the valve outlet seal. Fill the valve inlet
with the pressure specified in Table 2. Maintain the pressure for at least 1 minute. Check
whether the result meets the requirements of 5.3.4.
Note: The air tightness test during exit-factory inspection is only conducted at room temperature;
the test pressures are pvt, 0.05 MPa, vacuum degree (if required), respectively.
6.9.1.4 Vacuum air tightness test
Install the valve on the test device. Connect the valve outlet to the vacuum pump.
Connect the valve inlet to the vacuum gauge. Keep the valve in the open state. Turn on
the vacuum pump. Wait until the pressure in the valve reaches the set value. Close the
valve using the torque of Te, start (use Te, end after the endurance test) in Table 1. Hold it
for 5 minutes. The pressure in the valve shall not rise.
6.9.2 Air tightness test for exit-factory inspection
The air tightness test during exit-factory inspection shall be carried out at room
temperature, according to the methods of 6.9.1.2, 6.9.1.3, 6.9.1.4.
6.10 Vibration resistance test
Install the valve on the test device. Close the valve according to the Te, start torque in
Table 1. Fill nitrogen or air from the valve inlet to the pvt pressure. Install the test device
in three mutually perpendicular directions of X, Y, Z, on the vibration test bench in turn.
Carry out the test according to the parameters of a displacement amplitude of 2 mm (P-
P) and a frequency of 33.3 Hz. Each vibration is for 30 minutes. The pressure shall not
drop. Then observe whether each joint is loose; check whether the results comply with
the requirements of 5.3.5.
6.11 Endurance test
Install the valve on the test device as shown in Figure 7. Fill nitrogen or air from the
6.16 Hydrochloric acid corrosion resistance test
The hydrochloric acid corrosion resistance test is carried out according to the following
steps:
a) Take out the valve stem from the valve;
b) Place the valve stem horizontally into beaker A. Add 1:1 hydrochloric acid until
the specimen is immersed about 2/3. The specimen does not touch the wall of the
beaker. Place it at a temperature of 20 °C ~ 28 °C for 12 hours;
c) After taking it out, put it horizontally into another beaker B containing solid
sodium chloride and leave it for 12 hours;
d) Repeat steps b) and c) 4 times;
e) Install the specimen's valve stem into the specimen valve. Close the valve using a
torque not greater than To at room temperature and pvt pressure. Conduct an
internal air tightness test according to the requirements of 6.9.1.3. Check whether
the results comply with the provisions of 5.3.11.
6.17 Action test of safety pressure relief device
6.17.1 Operation test of bursting disc device
Install the valve on the test device. Keep the valve at a temperature of (60 ± 2) °C. Fill
it with clean air or nitrogen to 90% of the minimum burst pressure. Set the pressure
increase rate to the point where the minimum indication value can be accurately read
on the pressure gauge. Hold the pressure for not less than 5 seconds. Then pressurize
steadily and continuously. When increasing the pressure, the minimum indication of the
pressure gauge shall be accurately read; the pressure increasing rate per second shall
not be less than 0.1% of the bursting pressure, until the bursting disc ruptures. This
process shall not exceed 2 minutes. Check whether the results comply with the
provisions of 5.3.12.2.
6.17.2 Action test of fusible alloy plug device
The action temperature test, flow temperature test, extrusion resistance test of fusible
alloy plug device shall be carried out in accordance with the methods required by GB/T
8337. Check whether the results comply with the provisions of 5.3.12.3.
6.17.3 Action test of bursting disc-fusible alloy plug composite device
The flow temperature of fusible alloy plugs is tested according to the method required
by GB/T 8337. Check the results to see if they comply with the provisions of 5.3.12.4.
materials, corresponding tests shall be added;
c) When changing the valve body material, all tests that cause changes in test
conclusions due to changes in chemical composition and mechanical properties
need to be added;
d) When changing the material of the handwheel, an additional sample needs to be
added for endurance test (no need for subsequent air tightness test), integrity
inspection of the handwheel and the contact surface between the handwheel and
the valve stem, opening and closing test, fire test;
e) When changing the diameter of the handwheel, it is necessary to add endurance
test, internal air tightness test, parts integrity check, opening and closing torque
test;
f) When changing the basic design dimensions of the valve parts (such as the
diameter of the valve stem, the pitch of the valve stem or valve thread, the valve
diameter, the size of the O-ring, the thickness of the diaphragm, etc.), it is
necessary to add all tests caused by the change;
g) When changing the metal materials of the valve operating mechanism parts (such
as pressure cap, valve stem, diaphragm, spring), all tests caused by the change
need to be supplemented;
h) When changing the gas channel structure of the valve body (such as diameter and
flow channel angle), all tests caused by the changes need to be supplemented.
7.2.4 When providing samples, the manufacturer shall at least provide the following
information to the type testing agency:
a) Technical documents, including design drawings (which shall indicate the valve
structure, grease usage, applicable gas medium for the valve, working pressure,
design service life, whether it is used for gas cylinders with or without fixed
protection devices, etc.), operating instructions (which shall include various
torque values, etc.), parts list, material technical requirements, etc.;
b) Valve identification information;
c) Media compatibility statement that meets the requirements of ISO 11114-1 and
ISO 11114-2. If the material selected for the valve does not fall within the scope
of application of ISO 11114-1 and ISO 11114-2, a compatibility certificate of the
selected material shall also be provided;
d) The opening pressure and closing pressure range of the residual pressure device.
7.2.5 Valves for type testing shall be selected from products that have passed the exit-
factory inspection. The sampling quantity, test items, test sequence are as shown in
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.