GB/T 33146-2016 PDF English
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Valves for liquefied dimethyl ether cylinders
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GB/T 33146-2016: Valves for liquefied dimethyl ether cylinders---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT33146-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
J 16
Valves for Liquefied Dimethyl Ether Cylinders
液化二甲醚瓶阀
Issued on: OCTOBER 13, 2016
Implemented on: MAY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
1 Scope... 5
2 Normative Reference... 5
3 Terms and Definitions... 6
4 Model Compilation... 6
5 Structure Type and Basic Dimension... 7
6 Technical Requirements... 8
6.1 Material requirements... 8
6.1.1 Metallic materials... 8
6.1.2 Non-metallic sealing materials... 8
6.2 Process requirements... 9
6.3 Performance requirements... 9
6.3.1 Opening and closing performance... 9
6.3.2 Air tightness... 9
6.3.3 Vibration resistance... 10
6.3.4 Temperature resistance... 10
6.3.5 Durability... 10
6.3.6 Valve body pressure resistance... 10
6.3.7 Valve body stress corrosion resistance... 10
6.3.8 Installation... 10
6.3.9 Handwheel fire resistance... 10
6.4 Minimum design service life... 11
7 Detection and Test Methods... 11
7.1 General test principles... 11
7.2 Mechanical properties test and chemical composition analysis method of valve body
metallic material... 11
7.3 Material performance test of non-metallic seals... 11
7.4 Appearance inspection... 12
7.5 Inspection of the basic dimensions of the valve and the inlet and outlet threads... 12
7.6 Mass inspection... 13
7.7 Opening and closing test... 13
7.8 Air tightness test... 13
7.9 Vibration resistance test... 13
Valves for Liquefied Dimethyl Ether Cylinders
1 Scope
This Standard specifies the terms and definitions, model compilation, structural type and basic
dimensions, technical requirements, detection and test methods, inspection rules, marking,
packaging, storage and transportation of liquefied dimethyl ether cylinder valves (hereinafter
referred to as valves).
This Standard applies to valves on liquefied dimethyl ether cylinders with an ambient
temperature of -40 ℃ ~ +60 ℃, a nominal working pressure of 1.6 MPa, a nominal volume of
no more than 150 L, and a medium that complies with the provision of GB 25035.
This Standard does not apply to liquefied dimethyl ether cylinder valves for vehicles.
NOTE. The pressure in this Standard refers to the gauge pressure.
2 Normative Reference
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) is applicable 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 1184 Geometrical tolerancing - Geometrical tolerance for features without
individual tolerance indications
GB/T 1804 General Tolerances - Tolerances for Linear and Angular Dimensions without
Individual Tolerance Indications
GB/T 3934 Specification of gauges for general purpose screw threads
GB/T 4423 Copper and copper alloy cold-drawn rod and bar
GB/T 5121.1 Methods for chemical analysis of copper - The electrolytic method for the
determination of copper content
GB/T 5121.3 Methods for chemical analysis of copper and copper alloys - Part 3.
a) Aging resistance
Non-metallic seals shall be placed in air at a temperature of 100 ℃ ± 2 ℃ for 72 h
without cracks or obvious aging.
b) Low temperature resistance
Non-metallic seals shall be placed in air at a temperature of -40 ℃ ±1 ℃ for 24 h without
cracks or other damage.
c) Medium compatibility
After non-metallic seals are immersed in liquefied dimethyl ether solution at a
temperature of 23 ℃ ±2 ℃ for 168 h, the volume expansion rate is no more than 15% or
the shrinkage rate is no more than 1%, and the mass loss rate is no more than 10%.
6.2 Process requirements
6.2.1 The valve body shall be forged. The valve body surface shall be free of cracks, wrinkles,
inclusions, incomplete filling and other defects that may damage the valve performance. The
valve body surface shall be shot peened; and the size and depth of the surface pits shall be
uniform.
6.2.2 Unspecified size tolerance specified shall be processed according to the Level-m precision
in the GB/T 1804-2000 standard.
6.2.3 Unspecified geometric tolerance shall be processed according to the Level-k precision in
the GB/T 1184-2000 standard.
6.2.4 The actual mass of valves of the same model, specification and trademark after assembly
shall not deviate from the design mass of the valve by more than 5%.
6.3 Performance requirements
6.3.1 Opening and closing performance
Under the nominal working pressure, the opening and closing torque of the valve shall not
exceed 5 N·m; and there shall be no jamming when the valve is opened or closed in the full
stroke.
6.3.2 Air tightness
Under the following conditions and states, the valve leakage shall not exceed 15 cm3/h, or no
bubbles shall be generated when immersed in water for 1 min if tested by immersion method.
a) Under nominal working pressure, closed and any open state;
b) Under 0.05 MPa pressure, any open state.
6.4 Minimum design service life
The valve shall ensure safe use of at least one cylinder inspection cycle.
7 Detection and Test Methods
7.1 General test principles
7.1.1 Test environment
Except for special requirements, the tests of this Standard are carried out at room temperature
of 15 ℃ ~30 ℃, and the test room is kept shockproof, moisture-proof, corrosion-proof and
ventilated.
7.1.2 Test medium
Except for the pressure test medium which is clean tap water, other test media are pure dry air
or nitrogen.
7.1.3 Test pressure gauge
The accuracy of the test pressure gauge shall be no lower than Class-1.6, and the range of the
pressure gauge shall be 1.5 times to 2 times the test pressure.
7.2 Mechanical properties test and chemical composition analysis method of valve body
metallic material
The tensile test specimen and test method of valve body metallic material shall be in accordance
with GB/T 228.1; and the chemical composition analysis method shall be in accordance with
GB/T 5121.1, GB/T5121.3 and GB/T5121.9.
NOTE. When not in arbitration, the chemical composition analysis method of metal can also be selected
from electrolysis, atomic absorption, volumetric and spectroscopic methods.
7.3 Material performance test of non-metallic seals
7.3.1 Aging resistance test
Place three non-metallic seals in a test device at a temperature of 100 ℃ ±2 ℃ for 72 h. Then
take them out and visually observe their changes. The results shall comply with the provisions
of 6.1.2.1.
7.3.2 Low temperature resistance test
Place three non-metallic seals in a test device at a temperature of -40 ℃ ±1 ℃ for 24 h. Then
take it out and visually inspect its changes (if the seal is an O-ring, it shall be placed on a steel
mandrel with a diameter 1.2 times the inner diameter of the O-ring). The result shall comply
The inlet thread of the valve is inspected by a gauge that complies with GB/T 8336 and shall
comply with the provisions of 5.3.
The outlet thread of the valve is inspected by a gauge that complies with GB/T 3934 and shall
comply with the provisions of 5.4.
7.6 Mass inspection
Put the assembled valve on a balance with a sensitivity of no more than 1 g and an error of no
more than one thousandth; and weigh it, which shall comply with the provisions of 6.2.4.
7.7 Opening and closing test
Install the valve on the test device; block the outlet; open the valve; fill the inlet of the valve
with nitrogen or air to the nominal working pressure. Close the valve with a torque no greater
than 5 N·m; and the valve shall not leak under this pressure. Then open the valve with a torque
no greater than 5 N·m, and there shall be no jamming and no leakage during the full opening
and closing stroke of the valve.
7.8 Air tightness test
7.8.1 Install the valve on the test device; close the valve; fill the inlet of the valve with nitrogen
or air to the nominal working pressure. Immerse it in water for 1 min or place it in a leak
detection device. The result shall comply with the provisions of 6.3.2a).
7.8.2 Install the valve on the test device; block the outlet; and put the valve in any open state.
Fill the inlet of the valve with nitrogen or air to the nominal working pressure; immerse it in
water for 1 min or place it in a leak detection device. The result shall comply with the provisions
of 6.3.2a).
7.8.3 Install the valve on the test device; block the outlet; and put the valve in any open state.
Fill the inlet of the valve with nitrogen or air to a pressure of 0.05 MPa; immerse it in water for
1 min or place it in a leak detection device. The result shall comply with the provisions of
6.3.2b).
7.9 Vibration resistance test
Install the valve on the test device; close the valve according to the torque specified in 6.3.1.
fill the inlet of valve with nitrogen or air to the nominal working pressure; then install the test
device on the vibration test bench; vibrate in any direction for 30 min at an amplitude of 2 mm
and a frequency of 33.3 Hz; and then conduct an air tightness test according to the provisions
of 7.8.The result shall comply with the provisions of 6.3.3.
7.10 Temperature resistance test
7.10.1 Install the valve on the test device; make the valve in any open state; block the outlet;
fill the inlet of the valve with nitrogen or air to the nominal working pressure; and then place it
in a test box at 60℃ ± 2℃ for 2 h. After taking it out, start full-stroke manual opening and
closing of the valve within 30 s. After conducting for 25 times, place it in a test box at 60℃ ±
2℃ for 1 h. After taking it out, perform an air tightness test according to the provisions of 7.8
within 10 min. The result shall comply with the provisions of 6.3.4.
7.10.2 Install the valve on the test device; make the valve in any open state; block the air outlet.
Fill the inlet of the valve with nitrogen or air to the nominal working pressure; then place it in
a test box at -40℃ ± 2℃ for 2 h; take it out and start full stroke manual opening and closing of
the valve within 30 s. After conducting for 25 times, place it in a test box at -40℃ ± 2℃ for 1h.
After taking it out, perform air tightness test according to the provisions of 7.8 within 5 min.
The result shall comply with the provisions of 6.3.4.
7.11 Durability test
Install the valve on the test device; make the valve in the open state; block the outlet. Fill the
inlet of the valve with nitrogen or air to the nominal working pressure; then install the test
device on the durability test machine; and perform full stroke opening and closing at a rate of
8 times/min~15 times/min; and the opening and closing torque shall not exceed 5 N·m. After
30,000 full-stroke opening and closing, perform air tightness test according to 7.8.The result
shall comply with the provisions of 6.3.5.
7.12 Valve body pressure resistance test
Block the valve body and the external vents (except the inlet of valve body); connect the inlet
of valve body to the hydraulic pump; and fill the valve body with water to 5 times the nominal
working pressure through the hydraulic pump; and maintain the pressure for 5 min. The result
shall comply with the provisions of 6.3.6.
7.13 Valve body stress corrosion resistance test
The test method shall be in accordance with GB/T 10567.2; and the result shall comply with
the provisions of 6.3.7.
7.14 Installation test
Fix the valve on the test device and tighten it with a torque wrench according to the installation
torque specified in Table 3.The result shall comply with the provisions of 6.3.8.
7.15 Handwheel fire resistance test
The test method shall be in accordance with GB 15382; and the results shall comply with the
provisions of 6.3.9.
8 Inspection Rules
8.1 Material inspection
8.1.1 Materials and parts entering the factory shall have a quality certificate.
8.1.2 The mechanical properties (Rm, A) and chemical composition (Cu, Pb, Fe) of copper
materials and non-metallic seals shall be re-inspected according to the enter-factory batch
number.
8.2 Exit-factory inspection
8.2.1 Piece-by-piece inspection
The piece-by-piece inspection items are as follows.
a) Appearance inspection;
b) Inlet and outlet thread inspection;
c) Air tightness test.
8.2.2 Batch sampling inspection
The batch sampling inspection items are as follows.
a) Basic dimension inspection;
b) Quality inspection;
c) Opening and closing test;
d) Installation test.
8.2.3 Sampling inspection method and judgment
Valves shall be sampled from each batch (no more than 5,000 pieces) of continuously produced
products that have passed the piece-by-piece inspection. When the continuous production is
less than 5,000 pieces, they shall also be sampled as one batch; and 5 samples shall be taken
from each batch of finished products. During the inspection process, if one valve does not meet
the requirements of a certain item of this Standard, double sampling shall be conducted. If there
are still unqualified items after re-testing, the batch of valves shall be unqualified or piece-by-
piece inspection shall be carried out again.
8.3 Type test
8.3.1 The valve shall be subjected to type test when one of the following conditions is met.
9.2.2 The packaging box shall have the following marks.
a) Name and address of the manufacturer;
b) Name and model of the valve;
c) Necessary operating requirement symbols;
d) Quantity and gross weight;
e) Volume (length × width × height);
f) Production date or batch number;
g) Standard code implemented by the product;
h) Manufacturing license number and mark.
9.2.3 The product certificate shall indicate the following contents.
a) Name and address of the manufacturer;
b) Name and model of the valve;
c) Applicable temperature and medium;
d) Nominal working pressure and nominal diameter;
e) Production batch number;
f) Standard code implemented by the product;
g) Inspection date;
h) Design quality of the valve;
i) Manufacturing license number;
j) Seal of the quality department.
9.2.4 The packing list shall indicate the following contents.
a) Name and address of the manufacturer;
b) Name and model of the valve;
c) Quantity, gross weight and net weight;
d) Packer mark;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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