Wafer Check Valve

Product Model: DH77X-10Q、DH77X-16Q、DH77X-150LB
Size: DN50-DN800
Nominal Pressure: PN10/PN16/Class 150
Suitable Temperature: -20～120℃
Applicable Medium： Clear water, neutral liquid, Oils, etc.
Body Materials: Ductile Iron
Application field: Municipal construction, water treatment, water supply and drainage, water conservancy projects, etc.

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Product Introduction

Wafer check valve is mainly used at the water supply and drainage pipe network wells or the water pump outlet of fire fighting, petrochemical, light textile, papermaking and high-rise buildings. It is a safety device to prevent the backflow pressure difference of pipeline medium and forming water hammer impact and water pump reversal when the water pump is stopped.

1、Design Standards

Design and Manufacture Standard:	API 594
Face to Face	API 594
Test Standard：	API 598

2、Main Parts Materials

Body Materials:	DI
Disc Materials:	DI、CF8、CF8M、CF3、CF3M
Seat Materials:	EPDM、NBR
Stem Materials:	SS420、SS304

3、Product Advantages

（1）Small size, light weight, compact structure and convenient maintenance;
（2）The valve plate is of dual type, which can close quickly under the elastic moment of the spring.
（3）Due to the fast closing effect, it can prevent the medium from backflowing , and eliminate the strong effect of water hammer;
（4）The valve body structure has small length, good rigidity, safety and reliability;
（5）Surface coating: Epoxy powder coating is adopted, with strong adhesion and good weather resistance. It can be used indoors and outdoors.
（6）The numerically-controlled machine tool grinds the sealing surface of the body, with good flatness and surface roughness, which can ensure the zero pressure sealing of wafer check valve.
（7）The rubber and valve body are joined by vulcanization process, and the adhesive strength is higher than 1.7mpa, and it can avoid the falling off of the valve seat during use

4、Parameters

DN		φD	φD1	L	DN	φD	φD1	L
2″	DN50	101	65	43	12″	378	310	114
2.5″	DN65	118	80	46	14″	438	360	127
3″	DN80	132	94	64	16″	489	410	140
4″	DN100	157	117	64	18″	539	450	152
5″	DN125	186	145	70	20″	594	505	152
6″	DN150	213	170	76	24″	695	624	178
8″	DN200	272	224	89	28″	810	720	229
10″	DN250	328	265	114	32″	917	825	241