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GB/T 34530.1-2017 (GB/T34530.1-2017)

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GB/T 34530.1-2017English150 Add to Cart 0--10 minutes. Auto-delivery. Valve for cryogenic insulated cylinder -- Part 1: Pressure regulating valve GB/T 34530.1-2017 Valid GB/T 34530.1-2017
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GB/T 34530.1-2017: PDF in English (GBT 34530.1-2017)
GB/T 34530.1-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
J 74
Valve for cryogenic insulated cylinder -
Part 1: Pressure regulating valve
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Basic type ... 6 
5 Technical requirements ... 8 
6 Test methods ... 12 
7 Inspection rules ... 19 
8 Marking, packaging, transportation, storage ... 22 
9 Product certificate, quality certificate of product batch inspection ... 22 
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Basic type ... 6 
5 Technical requirements ... 8 
6 Test methods ... 12 
7 Inspection rules ... 19 
8 Marking, packaging, transportation, storage ... 22 
9 Product certificate, quality certificate of product batch inspection ... 22 
Valve for cryogenic insulated cylinder -
Part 1: Pressure regulating valve
1 Scope
This part of GB/T 34530 specifies the terms and definitions, basic types,
technical requirements, test methods, inspection rules, marking, packaging,
transportation, storage, product certificate, batch inspection quality certificate
of pressure regulating valves for cryogenic insulated cylinders (hereinafter
referred to as “valves”).
This part applies to the pressure regulating valve for gas cylinders which contain
mediums such as liquid oxygen, liquid nitrogen, liquid argon, liquefied natural
gas, carbon dioxide, nitrous oxide, have a nominal working pressure of not more
than 3.5 MPa, the design temperature of -196 °C ~ +85 °C, the ambient
temperature of -40 °C ~ +60 °C, the pressure regulating range of 0.2 MPa ~ 3.5
MPa.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 4423 Copper and copper-alloy cold-drawn rod and bar
GB/T 5231 Designation and chemical composition of wrought copper and
copper alloys
GB/T 12716 Taper pipe threads with 60 degree
GB/T 13005 Terminology of gas cylinders
GB/T 15382 General technical requirements for valves of gas cylinders
JB/T 6896-2007 Surface clearness of air separation plant
YS/T 482 Methods for analysis of copper and copper alloys - The atomic
emission spectrometry
3 Terms and definitions
The terms and definitions as defined in GB/T 13005 as well as the following
terms and definitions apply to this document.
3.1
Pressure build regulator
A valve that vaporizes the liquid in the pressure build line of cylinder, to raise
and stabilize the cylinder’s pressure.
3.2
Pressure economizer regulator
A valve that makes the cylinder to preferentially use the gas at the top of the
liner and maintains stable working pressure of the liner.
3.3
Combination pressure regulator
A valve that has both the pressure-increase function and the pressure-
reduction function.
3.4
Pressure build inlet
The inlet of the pressure build regulator and the combination pressure
regulator, which is connected to the pressure build line of the cylinder.
Note: The pressure build inlet is identified by PB IN.
3.5
Pressure build outlet
The outlet of the pressure build regulator, which is connected to the gas
phase space of the cylinder.
Note: pressure build outlet is identified as PB OUT.
3.6
Pressure economizer inlet
or oxidizing gas, it should use fluoroplastics.
5.1.2 Valve material
The valve material should adopt HPb59-1 lead brass. Its mechanical properties
and chemical composition shall meet the requirements of GB/T 4423 and GB/T
5231. When using other materials, the mechanical properties shall not be lower
than the requirements of HPb59-1.
5.1.3 Non-metallic sealing materials
5.1.3.1 Resistance to oxygen-aging
After being continuously placed in an oxygen (purity ≥ 99.5%) which has a
temperature of 70 °C ± 2 °C and a pressure of 2 MPa for 96 hours, when
checking in a magnifying glass of 25x, there shall be no crack.
5.1.3.2 Compatibility of liquefied natural gas medium
For the non-metallic sealing material for liquefied natural gas medium, immerse
it in n-pentane at a temperature of 25 °C ± 3 °C for 72 h; the volume change
rate shall be not more than 20%. Then place it in air at 40 °C ± 3 °C for 48 h,
the mass change rate shall be not more than 5%.
5.2 Design and process requirements
5.2.1 Valves and cylinders shall be thread-connected. The thread’s size should
be NPT 1/4. The thread’s precision shall meet the requirements of GB/T 12716.
5.2.2 The valve shall, according to the working pressure of the cylinder, be pre-
adjusted to a set pressure value. It shall also mark the set pressure value and
pressure regulating range on the valve.
5.2.3 The joints of the valve shall be permanently marked by abbreviated
markings.
5.2.4 The valve shall be so designed that the rotation of regulating screw
clockwise will increase the set pressure, otherwise it will reduce the set
pressure. Meanwhile it shall have a locking device.
5.2.5 It shall, according to the thermal expansion coefficient of the material, set
the clearance of the moving parts, to ensure that the moving parts are able to
move flexibly within the design temperature range.
5.2.6 The upper part of the bonnet shall have a venting hole, to keep the
pressure in the upper cavity consistent with the outside.
5.2.7 The sealing structure of the pressure build regulating should use metal-
maintain the pressure for at least 1 min, the pressure build sealing port of the
valve shall be free of leakage.
5.3.4 Pressure regulating performance of combination pressure regulator
and pressure build regulator
The valve shall, within the pressure regulating range, be pre-adjusted to a set
pressure. The allowable difference between the actual closing pressure of the
valve and the set pressure shall not exceed 5%. When the pressure at the
pressure build outlet is 90% below the set pressure, the valve shall open.
5.3.5 Pressure-regulating performance of pressure economizer regulator
The valve shall, within the pressure regulating range, be pre-adjusted to a set
pressure. Under the set pressure, the valve shall act. Reduce the pressure at
the input end of the valve. When the flowrate drops to 50 mL/min, the pressure
at the input end at this time must not be lower than 95% of the set pressure.
5.3.6 Opening performance of pressure economizer regulator
At 102% ~ 105% of the set pressure, the valve’s output flowrate shall be not
less than 800 mL/min.
5.3.7 Vibration-resistance
Under the nominal working pressure, the valve shall be able to withstand a
vibration which has a displacement amplitude of 2 mm (P-P), a frequency of
33.3 Hz, a time of 120 min, in three mutually-perpendicular directions (X, Y, Z).
Each threaded connection on the valve shall not loose. Meanwhile it shall meet
the requirements of 5.3.2.1.
5.3.8 Durability
Under the action of the liquid nitrogen gas at 105% of the set pressure, the
valve is subjected to 30000 pressure cycles as follows:
a) 28000 cycles at room temperature;
b) 1000 cycles at a temperature of 85 °C ± 2 °C;
c) 1000 cycles at -40 °C ± 2 °C.
The change of set pressure of the valve shall not vary by more than 5%.
Meanwhile it shall comply with the requirements of 5.3.2.1.
5.3.9 Resistance to salt spray corrosion
The valve shall, within the salt spray chamber of 33 °C ~ 36 °C, according to
the test method of 6.14, be subjected to 96 h of salt spray test. The change of
comply with the provisions of 5.1.3.2.
6.3.2 Test of mass change
This test uses the same group of specimens as for the test of volume change.
After finishing the test of volume change, place the sample in air at 40 °C ± 3 °C
for at least 48 h. Then place it at room temperature until the mass is constant.
Record the final weighing value (M2'). The mass change rate is calculated
according to the formula (2):
Take the average of the three samples as the test results, which shall meet the
requirements of 5.1.3.2.
6.4 Visual inspection
The appearance of the valve shall be checked by visual inspection. The results
shall comply with the provisions of 5.2.10 and 8.1.
6.5 Inspection of connection size of air inlet and outlet
The size of the air inlet and outlet of the valve shall be inspected by a gage that
meets the tolerance grade of the size. The inspection result shall meet the
corresponding tolerance requirements of the size.
6.6 Test of pressure resistance
Mount the valve on the test device. Plug the vent hole of the valve to outside.
Connect the air inlet of the valve to the hydraulic pressure test stand. Fill in
clean tap water. Slowly raise the pressure to 5 times the nominal working
pressure. Hold the pressure for 5 min. It shall comply with the provisions of
5.3.1.
6.7 Test of airtightness
6.7.1 Test of airtightness at ambient temperature
At ambient temperature, block the PB IN and PB OUT of valve. From the PB IN
(combination pressure regulator, pressure build regulator) and PB OUT
(pressure economizer regulator), fill in the dry, clean nitrogen or air, to 1.2 times
the nominal working pressure. Immerse it in water to hold pressure for at least
1 min. It shall meet the requirements of 5.3.2.1.
6.7.2 Test of airtightness at low-temperature
6.7.2.1 Test of airtightness of combination pressure regulator and
Mass change rate
6.14 Test of resistance to salt spray corrosion
Place the valve in a salt spray chamber at 33 °C ~ 36 °C. Block each inlet and
outlet of the valve. Under the conditions where there is no shield, use a solution
which consists of 5% sodium chloride and 95% distilled water (mass), to
continuously carry out 96 h salt spray test. Then remove it. Immediately rinse
the specimen. Gently wipe off the surface deposit. Then follow the requirements
of 6.7.1, 6.9, 6.10, carry out corresponding test. The results shall comply with
the provisions of 5.3.9.
6.15 Test of resistance to stress corrosion
Remove the grease from the valve. Use a torque of 30 N • m to tighten the plugs
on each port of the valve. It shall not use Teflon tape or sealant on the threads.
Pour 600 mL of ammonia water which has a relative density of 0.94 (mass) into
a 30 L capped glassware. Place the valve on a plastic tray 40 mm above the
level of the ammonia solution. Place the glassware in a high-temperature box
at a temperature of 34 °C ± 2 °C for 24 h. The results shall meet the
requirements of 5.3.10.
Note: 30 N • m is the tightening torque of NPT 1/4 thread. If using other threads,
it shall, according to the sealing requirements of the interface, determine the
corresponding torque.
7 Inspection rules
7.1 Inspection of raw materials
7.1.1 The enter-factory materials and parts shall have a quality certificate.
7.1.2 The valve material shall, based on batches of materials, be subjected to
enter-factory re-inspection of mechanical properties and chemical composition.
7.2 Exit-factory inspection
7.2.1 One-by-one inspection
The valve shall be inspected one by one before exit-factory. The inspection
items shall be as specified in Table 1. In the course of inspection, if one item
fails, the valve is unqualified.
7.2.2 Batch inspection
The valve shall be taken from the products that are continuously produced and
qualified after one-by-one inspection from each batch (not more than 2000
products form one batch). Take 3 samples from each batch. Where the number
of finished products per batch is less than 2000, also take 3 samples. The
10
Test of opening performance of pressure
economizer regulator (apply to pressure
economizer regulator)
6.11 5.3.6 V7 ~ V9
11 Test of vibration-resistance 6.12 5.3.7 V7
12 Test of durability 6.13 5.3.8 V8
13 Test of resistance to salt spray corrosion 6.14 5.3.9 V9
14 Test of resistance to stress corrosion 6.15 5.3.10 V5 ~ V6
8 Marking, packaging, transportation, storage
8.1 Marking
The valve shall have a clearly-visible, easy-to-view permanent marking, which
shall include at least the following:
a) The model of valve;
b) The pressure regulating direction of the valve;
c) The pressure regulating range and set pressure of valve;
d) The port identification of valve;
e) The name or trademark of the manufacturer;
f) The production batch number, product serial number;
g) No. of special equipment manufacturing license and the marking of .
8.2 Packaging, transportation, storage
Packaging, transportation, storage shall be in accordance with GB/T 15382.
9 Product certificate, quality certificate of product
batch inspection
9.1 Product certificate
Each valve shall be accompanied by a product certificate (or electronic
certificate mark). The certificate shall include the following contents:
a) The certificate number;
b) The name and model of the valve;
c) The pressure regulating range and set pressure of the valve;
......
 
(Above excerpt was released on 2019-05-11, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT34530.1-2017