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Check valve

Wafer Dual Plate Check Valve

wafer check valves, also known as dual plate check valves, have two spring loaded half-moon shaped discs that rotate about their shaft. The disc plates are kept shut by a torsion spring. When fluid flows in a forward direction, the pressure of the fluid causes the disc plates to swing open, allowing flow. The check valve is closed by the spring as soon as flow ceases, before any reverse flow can occur. The dual plate wafer check valves are a compact kind of check valve. With a small face to face length and being wafer type, these dual plate check valves can be mounted directly between flanges and in accordance to many standard connections.The body is made in one piece only, in cast iron with disc in ductile iron, stainless steel or AI-Bronze and spring in stainless steel these parameters allow the dual plate check valves to be applied for several applications. The automatic mechanism of plate opening grants low water losses,and the spring avoids fluid hammer effect.

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Description

wafer check valves, also known as dual plate check valves, have two spring loaded half-moon shaped discs that rotate about their shaft. The disc plates are kept shut by a torsion spring. When fluid flows in a forward direction, the pressure of the fluid causes the disc plates to swing open, allowing flow. The check valve is closed by the spring as soon as flow ceases, before any reverse flow can occur. The dual plate wafer check valves are a compact kind of check valve. With a small face to face length and being wafer type, these dual plate check valves can be mounted directly between flanges and in accordance to many standard connections.The body is made in one piece only, in cast iron with disc in ductile iron, stainless steel or AI-Bronze and spring in stainless steel these parameters allow the dual plate check valves to be applied for several applications. The automatic mechanism of plate opening grants low water losses,and the spring avoids fluid hammer effect.

The dual plate check valves has two spring loaded half-moon shaped discs that rotate about their shaft. The disc plates are kept shut by the torsion spring. When fluid flows in the forwards direction, the pressure of the fluid causes the disc plates to hinge open, allowing flow. Dual plate check valve is closed by the spring as soon as flow ceases, before any reverse flow can occur.

Dual plate check valve Featutes
1.Small in size,light in weight,compact in structure,easy in maintenance.
2.Two torsion springs are used excerting on each of the pair valve plates.Which close the plates quickly and automatically.
3.The quick-close action prevents the medium from flowing back and eliminates water-hammer effect.
4.This valve is short in length,so that it is rigid and easy to mount.
5.It is easy to install on pipeline which is laid horizontally or vertically.
6.This valve is tightly sealed without leakage under the pressure water test.
7.Safe and reliable in operation,high interference-resistance.
8.The connection dimensions of flanges accord with the standards of GB4216-84 GB4216.84
9.The face to face dimensions are in accordance with GB12221-89.ISO5752-82.The stem of the valve should be perpendicular to the horizontal level when the valve is mounted on horizontal pipeling.For vertical installation the direction of flow should be downward.


wafer Dual-plate  check valve
Design description of API 594 Dual Plate Check Valves:                              
One piece body                                                                         
Butterfly swing type
Dual-plate disc, Long-pattern
Renewable split disc
Hotizontal or vertical service
Wafer ends
Available with flanged ends

Design Standard of Dual Plate Check Valves:
Design and manufacture:API594,API 6D,ASME B16.34,DIN3356, JB/T8937
Face to face:API 594,API 6D,DIN3202,JB/T8937
End Flange: ASME B 16.5/ASME 16.47,DIN2543-2545,JB/T9112~24
Pressure Temp: ASME 16.34
Test: API598 , ISO5208,DIN3230, JB/T9092
Special : NACE MR-01-75
Material: WCB,LCB,WC6,WC9,CF8,CF8M,CF3,CF3M

Installation: horizontal / vertical with down-up flow direction. In horizontal position, the axis must be placed in vertical position. In vertical position, the plates must be opened in the same flow direction. Downstream, a piping of minimum length 5 times diameter, to be installed before the valve, and a pipe of minimum length 2 times diameter after the valve, to allow stabilization of flow and recovery. Installation between counter flanges.
Application:Water supply ,Heating,conditioning systems,Pumping stations , Waste water treatment plants,Irrigation.

Wafer Dual plate  check valve  main material list

No. Part name Material
1 Body A105 CF8 CF3(304L) CF8M CF3M(316L)
2 Disc CF8 CF8 CF3CF3 CF8M CF3M
3 Stem 2Cr3 304 304L CF8M CF3M(316L)
4 Spring 0Cr18Ni9 0Cr18Ni9 00Cr18N10 316 0Cr17Ni14Mo2
Suitable medium W.O.G.etc HNO3,CH2OOH etc.
Suitable Temperature -29-425℃ -196-540℃

Dual-plate wafer check valve Dimensions




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