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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.

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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 use

The national standard lift check valve is suitable for pipelines with nominal pressure of PN1.6-16 MPa and working temperature of -46~550 ℃ in various working conditions such as petroleum, chemical, pharmaceutical, fertilizer, and electric power industries 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 built-in pin shaft structure reduces the external leakage point and is reliable in use;
4, when the pressure> 16.0MPa, the valve cavity adopts self-tightening sealing structure, the higher the medium pressure, the better the sealing performance;
5. The material of the parts and the size of the flange and butt welding end 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 PN10.0 PN16.0
Test pressure
(MPa)
Shell test 2.4 3.75 6.0 9.6 15.0 24.0
High pressure seal 1.76 2.75 4.4 7.04 11.0 17.6
Low pressure seal 0.6

 

◆ Material of main parts

Part Name Carbon Steel Alloy Steel low temperature steel
Valve body WCB 13Cr/STL WC6 STL LCB 13Cr/STL
Disc WCB 13Cr/STL WC6 STL LCB 13Cr/STL
Gasket Flexible Graphite SS304 Flexible Graphite SS304 Flexible Graphite SS304
Bonnet WCB WC6 LCB
Stud 35CrMoA 35CrMoA 35CrMoA
Nut 45# 35CrMoA 35CrMoA
Spring 60Si12Mn 0Cr18Ni9(304) 0Cr18Ni9(304)

 

◆ 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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