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Fakai Valve Factory Site: Yongxing Industrial Zone, Longwan District, Wenzhou City Tel: 0577-88767789
Fax: 0577-85983279
Mobile: 15958706338
Contact: Mr. Wang Email: 1552028357@qq.com
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H77X Wafer Double Check Valve

H77X Wafer type double flap check valve structure diagram
H77X Wafer type double flap check valve structure diagram

Scope of application

H77X wafer double check valve uses wafer connection. Due to the short closing stroke of the valve flap and its spring loading, water hammer can be significantly reduced. The valve is mainly suitable for water supply and drainage pipe networks in cities, industries and high-rise buildings. Because its structure length is shorter than that of general check valves, it is most suitable for places with limited installation space.

Performance parameter

model Nominal pressure
PN (MPa)
Test pressure PN (MPa) Operating temperature
(℃)
Applicable medium
case seal

H77X
H77H
H77Y
H77W

1.0 1.5 1.1 Soft seal: <80
Hard seal: <450
Water, gas, oil, nitric acid, etc.
1.6 2.4 1.76
2.5 3.75 2.75
4.0 6.0 4.4
6.4 9.6 7.0

Part material

Part Name material
H77X-10C / 16/40/25 H77H-16C / 25/40/64 H77Y-25I / 40I / 64I H77W-16C / 25C / 40/25 H77W-10P / 25P / 16P / 40P
Valve body, butterfly plate Cast steel WCB Chrome-molybdenum steel Cast steel WCB 1Cr18Ni9Ti
Valve stem 2Cr13 1Cr18Ni9Ti 2Cr13
Body seal - Surfacing alloy welding Hardfacing welding - -
Assist spring 1Cr18Ni9Ti Heat resistant alloy 1Cr18Ni9Ti

Dimension table

Nominal diameter
DN (mm)
L D2 D3 Nominal diameter
DN (mm)
L D2 D3
H77X H77H
H77Y
H77W
H77X H77H
H77Y
H77W
50 43 100 43 46 400 140 485 376 390
80 64 135 71 80 450 152 545 427 427
100 64 155 91.5 94 500 152 608 479 490
125 70 185 115 118 600 178 718 579 588
150 76 210 141 145 700 229 800 675 686
200 89 265 191 200 800 241 905 774 784
250 114 320 230 250 900 241 1005 875 -
300 114 320 230 250 900 241 1005 875 -
350 127 435 340 340 1200 350 1325 1164 -