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National standard wedge gate valve

A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category.

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Classification:

Cast steel valve series

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Description


A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category. The valve may be operated manually or with a hand wheel, handle or pedal, and may also be controlled to vary the pressure, temperature and flow rate of the fluid medium. The valve can perform continuous or repeated operations on these changes, such as safety valves installed in hot water systems or steam boilers. In more complex control systems, automatic control valves are used as required by external inputs (I. e., to adjust the changing set point of the flow through the pipeline). The automatic control valve does not need to be manually operated according to its input and setting, so that the valve can accurately control the various requirements of the fluid medium. Valves can also be divided into cast iron valves, cast steel valves, stainless steel valves, chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, dual phase steel valves, plastic valves, non-standard customized valve materials, etc.

◆ Product overview

The national standard wedge gate valve is suitable for the pipeline of various systems of petroleum, chemical, hydraulic and thermal power stations with nominal pressure PN1.6 ~ 6.4MPa and working temperature of -29 ℃ ~ 550 ℃ to cut off or connect the pipeline medium. Applicable medium: water, oil, steam, and acid, alkali, ammonia, urea, sulfur-containing natural gas, etc.

◆Product features

1. Compact structure, reasonable design, good valve rigidity, smooth channel and small flow resistance coefficient;
2, the sealing surface is made of stainless steel and hard alloy, long service life;
3. Flexible graphite packing, reliable sealing, light and flexible operation;
4. The driving mode is manual, pneumatic, electric, gear transmission, hydraulic;
5. The structure form is elastic wedge type single ram, rigid wedge type single ram double ram type.



◆ Executive standards

Product Specification Design Specification Structure length Connecting flange TEST AND INSPECTION Pressure-Temperature
GB/T12234 GB/T12221-2005 JB/T79-2015、
HG/T 20592、GB/T 9113
GB/T 13927GB/T 26480 GB/T 12224

 

◆ Main performance specifications

1. Test pressure

Nominal pressure PN
(MPa)
Shell Test pressure (MPa) Upper seal
Seal (liquid) Seal (gas)
1.6 2.4 1.8 0.6 1.8
2.5 3.8 2.8 0.6 2.8
4.0 6.0 4.4 0.6 4.4
6.4 9.6 7.0 0.6 7.0

2. Applicable medium and applicable temperature

Shell material Applicable media Applicable temperature ℃
Carbon Steel (Type C) Water, steam, oil ≤ 425
Chromium-Nickel Steel (Type P) Nitric acid ≤200
Chromium-nickel-molybdenum steel (R type) Acetic acid ≤200
Chromium-molybdenum steel (Type I) Water, steam, oil ≤ 550

 

◆ Main parts materials

Body/Bonnet Ram/Seat Stem Stem Nut Packing Handwheel
carbon steel High quality carbon steel carbide or stainless steel Chrome stainless steel Copper alloy graphite asbestos packing malleable cast iron
chromium-nickel steel Stainless steel, stainless steel carbide Chromium nickel stainless steel Copper alloy dipped in polytetrafluoroethylene malleable cast iron
chromium nickel molybdenum steel Stainless steel, stainless steel carbide Chromium nickel stainless steel Copper alloy Asbestos packing malleable cast iron
chromium molybdenum steel Alloy Steel Cemented Carbide chromium molybdenum steel Copper alloy flexible graphite malleable cast iron

 

◆ Main outline connection dimension

Nominal pressure PN DN(mm) L D D1 D2 b-f Z-fd H
PN1.6MPa 50 250 165 125 102 18-3 4-F18 350
65 270 185 145 122 18-3 8-F18 370
80 280 200 160 138 20-3 8-F18 390
100 300 220 180 158 20-3 8-F18 435
125 325 250 210 188 22-3 8-F18 520
150 350 285 240 212 22-3 8-F22 610
200 400 340 295 268 24-3 12-F22 785
250 450 405 355 320 26-3 12-F26 960
300 500 460 410 378 28-4 12-F26 1080
350 550 520 470 438 30-4 16-F26 1200
400 600 580 525 490 32-4 16-F30 1400
450 650 640 585 550 40-4 20-F30 1500
500 700 715 650 610 44-4 20-F33 1630
600 800 840 770 725 54-5 20-F36 1830
PN2.5MPa 50 250 165 125 102 20-3 4-F18 350
65 270 185 145 122 22-3 8-F18 370
80 280 200 160 138 24-3 8-F18 390
100 300 235 190 162 24-3 8-F22 435
125 325 270 220 188 26-3 8-F26 520
150 350 300 250 218 28-3 8-F26 610
200 400 360 310 278 30-3 12-F26 785
250 450 425 370 335 32-3 12-F30 930
300 500 485 430 395 34-4 16-F30 1080
350 550 555 490 450 38-4 16-F33 1250
400 600 620 550 505 40-4 16-F36 1430

Note: The flange size in this table is in accordance with GB/T9113-2010, and the structure length is in accordance with GB/T 12221-2005.

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