| 1 | Upright lift check valve | 1, flow channel: horizontal straight, angle, DC (Y type) 2. Connection between valve body and bonnet: flange, external thread 3, flange end BS5352-1981: Flange, butt weld, internal thread, socket weld JB/T7749-1995: socket welding, internal thread JPI-7S-36-1999: Socket welding, internal thread 4, valve flap: ball (BS5352-1981), flat sealing plug, cone sealing plug | BS5352-1987 JB/T7746-1995 JPI-7S-36-1999 MSS-SP-42-1995 BS1868-1991 BS5160-1989 GB/T12235-1989 |
| 2 | Straight-through lift check valve | 1, flow channel: vertical straight through 2. Connection between valve body and bonnet: flange, external thread 3, flange end BS5352-1981: Flange, butt weld, internal thread, socket weld JB/T7749-1995: socket welding, internal thread JPI-7S-36-1999: Socket welding, internal thread 4, valve flap: ball (BS5352-1981), flat sealing plug, cone sealing plug | BS5352-1981 BS1868-1991 |
| 3 | Internal pressure self-tightening seal | 1. Flow path: horizontal straight through 2. Connection between valve body and valve cover: internal pressure self-tightening seal 3, the connection end: flange, butt welding, socket welding 4, valve flap: cone seal plunger or flat seal plunger | ASMEB16.34-1996 (pair welding, flange, connection) BS5352-1981 (refer to socket) |
| 4 | With lift spring lift check valve | 1, flow path: angle 2. Connection between valve body and valve cover: flange 3, the connection end: flange, thread, socket welding 4, valve flap: ball, plane seal plunger, cone seal plunger | BS1868-1991 BS5352-1981 JB/T7746-1995 JPI-7S-36-1999 ASMEB16.34-1996 BS5160-1989 |
| 5 | Single flap bottom valve | 1, flow channel: vertical straight through 2, connected with the pipe: flange 3, valve flap: flat sealing plug shape (the principle of action is the same as the plug-type lifting check valve) | BS5352-1987 JB/T7746-1995 JPI-7S-36-1999 MSS-SP-42-1995 BS1868-1991 BS5160-1989 GB/T12235-1989 |
| 6 | Double flap rotary bottom valve | The valve flap is a double-valve swing type, and the other principle is the same as that of the swing-type check valve. The principle of the large multi-lobed swing check valve is the same. | reference API594-1991 |
| 7 | Slow-closing swing check valve | 1. Flow path: horizontal straight through 2. The connection between the valve body and the valve cover: Diameter ≤150, flat cover flange diameter ≥200, butterfly flange 3, the connection end: flange, butt welding 4. The rocker is fixed: the rocker is out of the body, the rocker is fixed on the valve cover (upper type), the rocker is fixed on the valve body (the convex body in the valve body) but does not wear out of the body | JISB2074-1991 GB/T12236-1989 ASMEB16.34-1996 MSS-SP-42-1995 API-6D-2002 BS1868-1991 JPI-7S-46-1999 API594-1991 |
| 8 | Internal pressure self-tightening rotary check valve | 1. Flow path: horizontal straight through 2, the valve body and the valve cover connection: internal pressure self-tightening seal 3, the connection end: flange, butt welding 4. The rocker is fixed: the rocker is worn out of the body, and the rocker is fixed on the boss of the valve body, but does not wear out of the body. | ASMEB16.34-1996 |
| 9 | Swing check valve with buffer mechanism | Buffer mechanism: 1, rotary type 2, piston type | |
| 10 | Butterfly check valve | The internal structure and action principle are the same as those of the butterfly valve, and the rotating shaft supporting the valve flap is as safe as the swing check valve. | |
| 11 | Swing check valve | 1. Flow path: straight-through 2, valve body, bonnet connection: bolted connection 3. The valve body, valve cover and valve disc are all steel castings. 4, valve seat, valve sealing surface surfacing hard alloy | GB/T12236-1989 API6D-2002 |
| 12 | Counter-rotating double-valve check valve | 1. Flow path: straight-through 2, valve body: cast steel 3, the valve flap: double plate, after the spring is reset, it has a certain angle to the horizontal and is easy to close. 4, there are single valve stem and double valve stem | JB/T8937-1999 API6D-2002 |
| 13 | Single ball wear-free ball check valve | 1. Flow path: straight-through 2. The valve body and valve cover are cast steel parts. 3, valve body, bonnet connection: bolted connection 4, the ball body has a spherical guiding device 5, the sphere is hollow steel coated rubber is easy to seal 6, suitable for nominal diameter DN ≤ 150mm | |
| 14 | Multi-ball wear-free ball check valve | 1. Flow path: straight-through 2, valve body: valve cover: welded steel or steel plate welded 3, valve body, bonnet connection: bolted connection 4, the ball body has a spherical guiding device 5, the sphere is hollow steel coated rubber is easy to seal 6, suitable for nominal diameter DN200~600mm | |
| 15 | Flanged with damping butterfly check valve | 1. Flow path: straight-through 2. The valve body and the butterfly plate are cast steel parts. 3. The rotary shaft of the butterfly plate is located on the butterfly plate in the valve body with a damping pin. 4. The valve body is provided with a damping cylinder with a spring 5, the valve body has a limit device after opening 6, the valve seal is the same as the eccentric butterfly valve | API6D-2002 |
| 16 | Stop check valve | 1. Flow path: horizontal straight 2. Connection between valve body and valve cover: flange 3, the connection end: flange, butt welding 4, plane valve flap (for nominal diameter ≤ 50mm) | BS1873-1990 |
| 17 | Boiler feed water check valve | 1, flow path: angle 2. Connection between valve body and valve cover: flange 3, the connection end: flange 4. Check valve flap: spherical or conical disc with guide | See BS1873-1990 |
| 18 | Y-type lift check valve with draft tube | 1, flow channel: DC 2. Connection between valve body and valve cover: pressure self-sealing 3, the connection end: flange, butt welding 4. Valve flap: a spherical or tapered sealing plug valve with a return conduit between the valve flap and the outlet end. | ASMEB16.24-1991 |
| 19 | Empty check valve | Function: Stop the medium at the outlet end of the valve from flowing under atmospheric pressure, and discharge the residual pressure medium at the inlet end of the valve. | |
| 20 | Full pressure valve | Function: Installed on the ventilation pipe, automatically adjust the internal and external pressure difference (nominal diameter 150~400mm, pressure 0.67~2.4MPa) |
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