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.
Key words:
Classification:
Cast steel valve series
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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