Working principle and main standards of gate valves

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Main standards for gate valves: (1) GB/T 12232-2005 – General-purpose iron gate valves with flange connections; (2) GB/T 12234-2007 – Steel gate valves with bolted valve covers for use in the petroleum and natural gas industries; (3) GB8486-87 – General technical specifications for gate valves, globe valves, ball valves, and check valves with internal thread connections; (4) GB8465.1-87 – Basic dimensions for gate valves, globe valves, ball valves, and check valves with internal thread connections (iron gate valves); (5) JB/T53162-1999 – Quality grading of gate valve products; (6) JB/T5298-91 – Steel flat gate valves for pipelines; (7) JB/Z243-85 – Procedures for testing the hydrostatic service life of gate valves; (8) JB/TQ648-8 – Iron wafer-type flat gate valves; (9) JB/T53200-94 – Quality grading of iron wafer-type flat gate valve products; (10) JB/T53242-94 – Quality grading of steel flat gate valve products. 1. Working principle of gate valves: The closing element (gate plate) moves vertically along the centerline of the passage to achieve full opening and full closing, thereby shutting off flow. 2. Selection of gate valves: Gate valves are primarily used to shut off or connect the fluid in a pipeline, and are generally not used for regulation or throttling. 3. Classification of gate valves: Depending on the classification method, gate valves can be divided into parallel gate valves, wedge gate valves, lift gate valves, rotating rod gate valves, quick-opening and closing gate valves, reduced-diameter gate valves, flat gate valves, etc. 4. Features of gate valves: low fluid resistance, a wide range of applicable pressures and temperatures, no restriction on the flow direction of the medium, and good sealing performance. Execution standards for gate valves:
1. Product standards for gate valves:
“General requirements for iron gate valves with flange connections” GB/T 12232-2005
“General requirements for steel valves” GB/T 12224-2005
“Steel flat gate valves for pipelines” JB/T 5298-91
“Inspection and testing of valves” JB/T 9092-1999
“Safety evaluation standards for water supply and distribution equipment and protective materials for potable water” GB/T 17219-1998

2. Engineering standards for valves:
“Code for acceptance of construction quality of building water supply, drainage and heating systems” GB 50242-2002
“Code for acceptance of construction quality of ventilation and air conditioning systems” GB50243-2002
JB/T 1712-2010: Packing and packing gaskets for gate valve components
GB 15558.3-2010: Buried polyethylene (PE) pipeline systems for gas – Part 3: Gate valves
JB/T 2769-2010: High-pressure threaded flanges for gate valve components
JB/T 1741-2010: Stem parts for gate valve components
JB/T 1726-2010: Valve disc covers and split rings for gate valve components
JB/T 1703-2010: Bushings for gate valve components
JB/T 3595-2002: General requirements for power station gate valves
JB/T 5208-2010: Spacer rings for gate valve components
JB/T 1700-2010: Nuts, bolts and plugs for gate valve components
GB/T 12239-2010: Industrial gate valves and metal diaphragm valves
JB/T 6903-2010: Ultrasonic testing of forged steel parts for gate valves
GBT 22652-2010: Process qualification for surfacing of seal surfaces on gate valves
GB/T 8464-2010: Iron and copper threaded gate valves
JTJ 308-2003: Design code for marine gate valves
JB/T 6902-2010: Liquid penetrant testing for gate valves
GB/T 13927-2010: Pressure testing of industrial gate valves
GB/T 15188.1-1994: Structural length of gate valves – Welded connection gate valves
GB 13927-1992: Pressure testing of general gate valves
DB33/T 730-2009: Quality requirements for copper gate valves in gas pipelines
JB/T 2778-2010: Temperature marking for high-pressure pipe fittings and fasteners used in gate valve components
JB/T 5211-2010: Valve seats for gate valve components
JB/T 7760-2010: Standards for packing seal testing of gate valves
JB/T 7248-2010: Technical requirements for castings made of low-temperature steel for gate valves
JB/T 2772-2010: High-pressure blind flanges for gate valve components
JB/T 1718-2010: Gaskets and retaining washers for gate valve components
GB/T 6567.4-2010: Graphic symbols for piping systems in technical drawing – Gate valves and control elements
JB/T 10768-2007: Electric gate valves for air-conditioning water systems
GB/T 6567.5-2010: Graphic symbols for piping systems in technical drawing – Axonometric representation of symbols for pipes, pipe fittings and gate valves
JB/T 6440-2010: Radiographic testing of pressure-cast steel parts for gate valves
JB/T 93-2010: Wrenches, handles and hand wheels for gate valve components
GB/T 12227-2009: Technical requirements for ductile iron parts of general gate valves
EJ/T 531-2001: Evaluation of drive mechanisms for safety-grade gate valves in nuclear power plants
GB/T 308-2004: Method for naming gate valve models
GB/T 19278-2003: General definitions and terms for thermoplastic pipes, pipe fittings and gate valves
GB/T 12226-2005: Technical requirements for gray cast iron parts of general gate valves
GB/T 21465-2010: Terms related to gate valves
JB/T 5300-2010: Guidelines for selecting materials for industrial gate valves
JB/T 450-2010: Technical requirements for forged angular high-pressure gate valves
YB/T 5136-1993: Chromium-vanadium spring steel wires for gate valves
YB/T 5102-1993: Oil-quenched and tempered carbon spring steel wires for gate valves
SN/T 1455-2004: Inspection procedures for exported gate valves
SHS01030-92 (English version): Maintenance and repair procedures for gate valves
SH/T 3064-2003: General steel gate valves for petrochemical industries – Inspection and acceptance
SH/T 3064-2003: Selection and inspection of general steel gate valves for petrochemical industries
SH/T 3064-2003: Selection, inspection and acceptance of general steel gate valves for petrochemical industries
SH 3518-2000: Inspection and management procedures for gate valves
SH 3518-2000: Inspection and management procedures for gate valves
SH 3064-94 (old PDF version): Selection, inspection and acceptance of general steel gate valves for petrochemical industries
QJ 16-20: Design criteria for low-temperature gate valves
JB/T 10529-2005: Technical requirements for ceramic-sealed gate valves
JB/T 7746-2006: Compact steel gate valves
JB/T 6446-2004: Vacuum gate valves
JB/T 5263-2005: Technical requirements for cast steel parts of power station gate valves
CJ/T 180-2003: Manual gas gate valves for household use
CB/Z 800-2004: Guide for selecting marine gate valves
GB/T 19672-2005: Technical requirements for pipeline gate valves
GB/T 12230-2005: Technical requirements for stainless steel castings of general gate valves
GB/T 12227-2005: Technical requirements for ductile iron parts of general gate valves
GB/T 12226-2005: Technical requirements for gray cast iron parts of general gate valves