GB/T 34530.1-2017 English PDF (GBT34530.1-2017)

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GB/T 34530.1-2017: Valve for cryogenic insulated cylinder -- Part 1: Pressure regulating valve
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 nitro...