H77X Double Disc Check Valve

• Media: Water-Vapour Oil
• Temperature: Low Temperature
• Material: Stainless Steel Carbon Steel Brass
• Connection Form: Flange Welding
• Structure: Swing
• Pressure: High Pressure, Medium Pressure and Low Pressure
• Model NO.: H77X
• Function: Ddcv Double Lobe, Nrvr Silence, Sfcv Rubber Lobe, Nrvz Silence, Nrvg Silence
• Sealing Form: Hard Seal and Soft Seal
• Flow Direction: Unidirection
• Standard: DIN GB ANSI Bsw JIS
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Transport Package: Wooden Box
• Specification: DN15-DN800
• Trademark: XC
• Origin: China
• HS Code: 8481804090
• Production Capacity: 9999

Product Description

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 number	Nominal pressure PN(MPa)	Test pressure PN(MPa)		Operating temperature (ºC)	Applicable medium
		Shell	Tight 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

Materials for main parts:

Zero parts name

Ingredients

H77X-	10C, 25
	16, 40

H77H-	16C -, 40
	25, 64

H77Y-	25I	64I
	40I

H77W-	16C, 25
	25C, 40

H77W-	10P, 25P
	16P, 40P

Body, butterfly plate

Cast steel WCB

Chrome-molybdenum steel

Cast steel WCB

1Cr18Ni9Ti

Valve stem

2Cr13

1Cr18Ni9Ti

2Cr13

Body seal ring

-

Surfacing alloy welding

Surfacing welding carbide welding

-

-

Helper spring

1Cr18Ni9Ti

Heat resistant alloy

1Cr18Ni9Ti 

Main form connection dimensions:

Nominal diameter DN(mm)	L	D 2	D 3		Nominal diameter DN(mm)	L	D 2	D 3
			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	seven hundred	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