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QC/T 932-2012
ICS 43.160
T 50
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Emergency shutoff valve of road tanker for dangerous
liquid goods transportation
ISSUED ON. DECEMBER 28, 2012
IMPLEMENTED ON. JUNE 1, 2013
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China
Table of Contents
Foreword ... 1
1 Scope ... 2
2 Normative References ... 2
3 Terms and definitions ... 3
4 Requirements ... 4
5 Test method... 9
6 Inspection rules ... 11
7 Marking ... 13
Annex C (Normative) Dimension specifications of the connection flange
between bottom valve and the fluid pipeline (square shape) ... 14
Annex D (Informative) The testing device of the cracking safety ... 15
Annex E (Normative) The test position of the cracking safety ... 16
References and Original Chinese Documents ... 17
Foreword
This Standard is prepared according to the rules specified in GB/T 1.1-2009.
Annex A, B, C and E of this Standard are normative, annex D is informative.
This Standard is proposed and is under the jurisdiction of National Technical Committee
(SAC/TC 114) on Road Vehicles of Standardization Administration of China.
The responsible drafting organizations. Dongguan Yongqiang Auto Co., Ltd, Hanyang
Special Purpose Vehicle Institute, Yongjia Sanjiang Petroleum Machinery Plant, Zhejiang
Jialong Machinery Equipment Co., Ltd, Xiagong Chusheng (Hubei) Special Vehicle Co.,
Ltd and Dufu (Shanghai) Trade Co., Ltd.
The chief drafting staffs of this Standard. Su Debiao, Wu Yueling, Gong Zhangyong, Lyu
Shixiang, Wang Zhaoping and Yu Shijiang.
Emergency shutoff valve of road tanker for dangerous
liquid goods transportation
1 Scope
This Standard stipulates the terms and definitions, requirements, test methods, inspection
rules and markings of the emergency shutoff valve of road tanker for dangerous liquid
goods transportation.
This Standard is applicable to the transportation of liquid petroleum products and other
dangerous liquids which comply with the Class III dangerous liquid in GB 6944
“Classification and Code of Dangerous Goods”, including petroleum whose steam
pressure is not higher than 110kPa at 50 °C, but excluding the emergency shutoff valve of
road tanker for liquid desensitized explosives, poisons and corrosives.
2 Normative References
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(Including all corrections) or revisions made thereafter shall be applicable to this Standard.
GB/T 1239.2-2009 Cold coiled helical spring technical specifications - Part 2.
Compressions spring
GB/T 2828.1-2003 Sampling procedures for inspection by attributea-Part1. Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 4356 Stainless steel wire rods
GB/T 5218 Alloy spring steel wires
GB/T 13927-2008 Industrial valves - Pressure testing
GB/T 15114 Aluminum alloy die castings
GB/T 15115 Die casting aluminum alloys
JB/T 9092-1999 Valve inspection and testing
the experiment pressure is maintained continuously for at least 10min, the valve body of
the non-pressure-balance bottom valve shall be in good state.
4.12 Sealing performance of the valve body
Within the designed temperature range, the valve body of the bottom valves (including the
operating mechanisms) shall not leak under the specified pressure state for 60s.
4.13 Sealing performance of the valve seats
Within the designed temperature range, under the specified pressure state, after
pressurized for 60s - valve clacks, valve seats and surfaces of valve body, etc. shall not
have any apparent and visible leakage. The leaking volume shall comply with the
requirements in “All Resiliently Sealed Deputy Valve” in Table 4 of JB/T 9092-1999.
4.14 Operability
After the assembly is completed, bottom valve shall be able to turn-on and turn-off quickly
through the on-off operating device; no blocking symptoms; and the closing time must not
be longer than 2s.
4.15 Service life
After 25,000 times of opening and closing actions without lubricating, bottom valve shall
still have good operability and good sealing performance on the valve seats, and pass the
sealing performance test on the valve seats.
4.16 Cracking safety
4.16.1 When the valve seat of the bottom valve (sealing mechanical part) is designed, it
shall guarantee to be in the wrapping range of the independent barn of installed tank.
4.16.2 The bottom valve shall be designed as shear structure (shear grooving design).
When it suddenly cracks and falls off under the accidental damages like the collision of
external shell of the bottom valve, etc., the sealing mechanism in the wrapping range of
the independent barn of the installed tank shall be in good state without damage.
4.16.3 The impact energy causing the cracking and falling off of the external shell of the
bottom valve due to collision shall not be more than 1000J.
4.16.4 When the external shell of the bottom valve cracks and falls off caused by
external force, its sealing mechanism and the installation connection of the bottom seat
shall be in good state. The requirements for leaking volume are as follows.
5.7.1 In this test, at least 4 samples shall be taken from each type of products as
sample-group for testing.
5.7.2 Testing device.
a) The testing device has a small container of which the side is connected to the
connecting-flange of the tested bottom valve, before the test is conducted.
b) The typical device structure parts are shown in Annex D.
c) The impact loading will be successively loaded to the four
vertical-central-line-surfaces of the tank-body-installation-connecting-flange and the
inspected bottom valve. The specific positions are shown as Annex E.
d) The tested bottom valve shall be installed in the small container of the testing device,
and the installation method shall be same as that of installing it in the independent barn of
the tank body. During the installation, the screws and sealing gaskets used shall be
consistent with the requirements of the instructions provided by the manufacturer.
5.7.3 Test procedures.
a) Install the tested bottom valve (including the operating device) on the protruding edge
of installation flange of the testing device;
b) Operate the bottom valve to validate its opening/closing functions;
c) Close the bottom valve and fully-fill the small container with water;
d) Pressurize the small container to at-least 20kPa hydrostatic pressure, and maintain
this pressure throughout the testing of the bottom valve;
e) Let stand for 60s and observe it, so as to make sure the bottom valve is in good
sealing state;
f) Conduct the impact test according to the specified impact loading;
g) 1 min after implementing the impact test; make sure that the remaining pressure
inside the container is higher than atmospheric pressure. Check the leaking volume under
the circumstances that the sealing components of the bottom valve and the valve seat are
not damaged.
6 Inspection rules
6.1 Out-of-factory items
References and Original Chinese Documents
[1] QC/T 932-2012 Emergency shutoff valve of road tanker for dangerous liquid goods
transportation.
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