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Stainless steel 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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Stainless 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 use

The stainless steel gate valve is suitable for the pipeline of various systems of petroleum, chemical, hydraulic and thermal power stations with nominal pressure PN1.6 ~ 2.5MPa and working temperature <-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, small flow 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.



◆ Main technical specifications

Design Criteria GB/T12234
Pressure-Temperature Rating GB/T12224
Structure length GB/T12221
Flange connection size JB/T 79、GB/T9113、HG/T20592
Welding end connection GB/T12224
Inspection and test JB/T9092、GB/T13927、GB/T26480
Nominal pressure (MPa) PN1.6 PN2.5 PN 4.0
Test pressure (MPa) Shell test 2.4 3.75 6.0
High pressure seal test 1.8 2.8 4.4
Low pressure gas seal test 0.6 0.6 0.6
Upper seal test 0.6 0.6 0.6
Applicable temperature -29 ℃ ~ 550 ℃ (different materials for different working conditions)
Applicable media Water, oil, steam and all kinds of corrosive media (different media use different materials)

 

◆ Material of main parts

Part Name Material Part Name Material
Valve body CF8/CF8M Packing flexible graphite
Ram CF8/CF8M Packing sleeve A182F304/F316
Stem A182 F304/F316 Packing gland CF8/CF8M
Bolt A193 B8 Swing bolt A193 B8
Nut A1948 Stem Nut ZCuAl10Fe3
Gasket Flexible graphite stainless steel Handwheel KTH300-08
Bonnet CF8/CF8M Lock nut ASTM A105

 

◆ 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
500 700 715 650 310 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 16F30 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/T 9113-2010, and the structure length is in accordance with GB/T 12221-2005.
 

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