Check valve structure and design standards

Serial Number | Name | Structure and Characteristics | Applicable Design Standards
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
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