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  • H77X double disc check valve
  • H77X double disc check valve
  • H77X double disc check valve

H77X double disc check valve

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The 77X double clamped check valve is installed in the piping system and its main function is to prevent the backflow of the medium. The check valve is an automatic valve that opens and closes depending on the pressure of the medium. It has the advantages of small fluid resistance, low water hammer pressure when the valve is closed, convenient installation and maintenance, and short and long service life.
Performance parameters:

Type numberNominal pressure PN(MPa)Test pressure PN(MPa)Operating temperature (ºC)Applicable medium
ShellTight seal
H77X
H77H
H77Y
H77W
1.01.51.1Soft seal:
< 80
Hard seal:
< 450
Water, gas, oil, nitric acid, etc
1.62.41.76
2.53.752.75
4.06.04.4
6.49.67.0

Materials for main parts:

Zero parts nameIngredients
H77X-10C, 2516, 40
H77H-16C -, 4025, 64
H77Y-25I64I40I
H77W-16C, 2525C, 40
H77W-10P, 25P16P, 40P
Body, butterfly plateCast steel WCBChrome-molybdenum steelCast steel WCB1Cr18Ni9Ti
Valve stem2Cr131Cr18Ni9Ti2Cr13
Body seal ring-Surfacing alloy weldingSurfacing welding carbide welding--
Helper spring1Cr18Ni9TiHeat resistant alloy1Cr18Ni9Ti 

Main form connection dimensions:

Nominal diameter DN(mm)LD 2D 3Nominal diameter DN(mm)LD 2D 3
H77XH77H 
H77Y 
H77W
H77XH77H 
H77Y 
H77W
50431004346400140485376390
80641357180450152545427427
1006415591.594500152608479490
12570185115118600178718579588
15076210141145seven hundred229800675686
20089265191200800241905774784
2501143202302509002411005875-
3001143202302509002411005875-
350127435340340120035013251164


Product Description

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve

H77X double disc check valve