Welded Check Valve

Welded Check ValveClick to view the big picture
Short Description
 Model No.: H61H    Hits: 1446
China Welded Check Valve manufacturer Xinhai offers Bolted Bonnet Welded Check Valve, ASTM A105, A182 F22/F304/F316, A276 disc, SS Gasket, 150-1500#.

Key Specifications / Features

Welded check valve has three varieties of valve bonnet designs. The first kind is bolt bonnet, which adopts fillet and groove joint and uses gasket with the material of stainless steel and flexible graphite. It can also adopts ring type joint as required. The second kind is welded bonnet,. It is welded after screw thread sealing. It can also adopt rigid welding as required. The third kind is self-sealing bonnet which connects by thread and pressure seal bonnet.
 
Introduction 
Welded check valve open or close the disc by medium to avoid refluence of medium. It is also called as cut-off valve, one-way valve, reflux valve and back pressure valve.. Welded check valve can be classified into swing check valve (rotating with barycenter) and lift check valve (moving along with axis).
 
Manufacturing Specifications
Manufacturing: MSS SP-118,BS5352,ANSI/ASME B16.34
Test & Inspection: API 598
Marking: MSS SP-25
 
Structure 
1. Full bore or reduced bore;
2. Lift check valve;
3. Ball check valve;
4. Swing check valve;
5. Using spring to assist reset;
6. Bolt bonnet, welded bonnet and self-sealing bonnet
7. Socket Welding: ANSI/ASME B16.11 8;
8. Thread(NPT): ANSI/ASME B1.20.1.

Materials 
NO. Components American Standards 
Carbon Steel CS to ASTM
American Standards 
Alloy Steel AS to ASTM
American Standards 
Stainless Steel SS to ASTM
    Type A 105 Type F22 Type F304(L) Type F316(L)
1 Body  A105 A182 F22 A182 F304(L) A182 F316(L)
2 Lift valve disc A276 410 A276 304 A276 F304(L) A276 F316(L)
3 gasket  Corrugated SS+graphite SS+PTFE
4 Bonnet  A105 A182 F22 A182 F304(L) A182 F316(L)
5 Name Plate  
6 Bolt  A193 B7 A193 B16 A193 B8M A193 B8M
Applicable Medium    Water, oil, gas, etc HNO3,CH3OOH, etc
Applicable Temperature -29℃~425℃ -29℃~550℃ -29℃~180℃
Notes: other materials based on requirements. CS=carbon steel; AS=alloy steel; SS=stainless steel 

Dimensions & Weights
Size Port Reduced Bore(RB) 3/8 1/2 3/4 1 1 1/4 1 1/2 2  
NPS Full Bore(FB)   3/8 1/2 3/4 1 1 1/4 1 1/2 2
L 150~800Lb 79 79 92 111 120 152 172 200
  900~1500Lb 111 111 111 130 152 172 220 220
H(OPEN) 150~800Lb 61 61 65 79 95 103 118 132
  900~1500Lb 65 79 79 97 104 120 139 215
Weights Bolted 150~800Lb 1.4 1.2 1.5 3.1 3.9 5.6 8.9 12.5
    900~1500Lb 1.6 3.4 3.3 5.5 6.0 9.2 12.9 16.2
  Welded 150~800Lb 1.1 1.0 1.2 2.9 3.3 4.9 8.1 10.9
    900~1500Lb 1.3 3.2 3.1 4.8 5.4 8.5 11.2 14.3

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