National standard lift check 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:
Stainless 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 use
National standard lift check valve is suitable for nominal pressure PN1.6-2.5MPa, working temperature -196~550 ℃ of petroleum, chemical, pharmaceutical, fertilizer, power industry and other working conditions of the pipeline, to prevent the backflow of the medium.
◆Product features
1. The product has compact structure, reliable sealing, excellent performance and beautiful appearance;
2, valve, valve seat sealing surface welding Co-based carbide, wear resistance, corrosion resistance, anti-scratch performance is good, long service life;
3. The material, flange and gasket size of the parts can be reasonably selected according to the actual working conditions or user requirements to meet various engineering needs.
◆ Executive standards
| Design Criteria | GB/T 12235 |
| Pressure Temperature Rating | GB/T 12224 |
| Structure length | Gb/t 12221-2005 、 gb/t 15188.1 |
| Flange type and size | GB/T9113-2010、JB/T 79-2015 |
| Butt-weld end connection | GB/T 12224 |
| Inspection and test | GB/T 26480、GB/T13927 |
◆ Main performance specifications
| Nominal pressure (MPa) | PN1.6 | PN2.5 | PN4.0 | PN6.4 | |
| Test pressure (MPa) |
Shell test | 2.4 | 3.75 | 6.0 | 9.6 |
| High pressure seal | 1.76 | 2.75 | 4.4 | 7.04 | |
| Low pressure seal | 0.6 | ||||
| Applicable temperature | -196 ℃ ~ 550 ℃ (different materials for different working conditions) | ||||
| Applicable media | Water, oil, steam and all kinds of corrosive media (different media use different materials) | ||||
◆ Main parts materials
| Part Name | Stainless Steel | Alloy Steel | low temperature steel |
| Valve body | CF8/CF8M | WC6 | LCB |
| Disc | CF8/CF8M | WC6 | LCB |
| Gasket | Flexible Graphite SS304/316 | Flexible Graphite SS304 | Flexible Graphite SS304 |
| Bonnet | CF8/CF8M | WC6 | LCB |
| Stud | B8、B8M | A193 B16 | A320 L7 |
| Nut | 8、8M | A1942H | A1947 |
| Spring | X-750 | 17-7PH | 17-7PH |
◆ Main outline connection dimension
| Nominal pressure PN | DN(mm) | L | D | D1 | D₂ | b-f | Z-Fd | H | WT(kg) |
| PN1.6MPa | 20 | 150 | 105 | 75 | 58 | 18-2 | 4-F14 | 77 | 4 |
| 25 | 160 | 115 | 85 | 68 | 18-2 | 4-F14 | 80 | 5 | |
| 32 | 180 | 140 | 100 | 78 | 18-2 | 4-F18 | 85 | 7 | |
| 40 | 200 | 150 | 110 | 88 | 18-3 | 4-F18 | 95 | 9 | |
| 50 | 230 | 165 | 125 | 102 | 18-3 | 4-F18 | 105 | 10 | |
| 65 | 290 | 185 | 145 | 122 | 18-3 | 8-F18 | 120 | 20 | |
| 80 | 310 | 200 | 160 | 138 | 20-3 | 8-F18 | 130 | 30 | |
| 100 | 350 | 220 | 180 | 158 | 20-3 | 8-F18 | 140 | 39 | |
| 125 | 400 | 250 | 210 | 188 | 22-3 | 8-F18 | 155 | 50 | |
| 150 | 480 | 285 | 240 | 212 | 22-3 | 8-F22 | 180 | 70 | |
| 200 | 600 | 340 | 295 | 268 | 24-3 | 12-F22 | 215 | 161 | |
| 250 | 730 | 405 | 355 | 320 | 26-3 | 12-F26 | 260 | 251 | |
| 300 | 850 | 460 | 410 | 378 | 28-4 | 12-F26 | 315 | 395 | |
| PN2.5MPa | 20 | 150 | 105 | 75 | 58 | 18-2 | 4-F14 | 105 | 5 |
| 25 | 160 | 115 | 85 | 68 | 18-2 | 4-F14 | 120 | 5.7 | |
| 32 | 180 | 140 | 100 | 78 | 18-2 | 4-F18 | 130 | 9.1 | |
| 40 | 200 | 150 | 110 | 88 | 18-3 | 4-F18 | 135 | 11.8 | |
| 50 | 230 | 165 | 125 | 102 | 20-3 | 4-F18 | 149 | 14.4 | |
| 65 | 290 | 185 | 145 | 122 | 22-3 | 8-F18 | 160 | 23 | |
| 80 | 310 | 200 | 160 | 138 | 24-3 | 8-F18 | 169 | 30 | |
| 100 | 350 | 235 | 190 | 162 | 24-3 | 8-F22 | 194 | 44 | |
| 125 | 400 | 270 | 220 | 188 | 26-3 | 8-F26 | 222 | 65 | |
| 150 | 480 | 300 | 250 | 218 | 28-3 | 8-F26 | 255 | 99 | |
| 200 | 600 | 360 | 310 | 278 | 30-3 | 12-F26 | 305 | 190 | |
| 250 | 730 | 425 | 370 | 335 | 32-3 | 12-F30 | 355 | 315 | |
| 300 | 850 | 485 | 430 | 395 | 34-4 | 16-F30 | 410 | 450 |
Note: The flange size in this table is in accordance with GB/T9113 and EN1092 standards, and the structure length is in accordance with GB/T 12221 standards.
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