Butterfly Check Valve

The oxygen specific shut-off valve is made of high-quality silicon brass or stainless steel casting, which has the advantages of high mechanical strength, wear resistance, and good safety. Used on oxygen pipelines, it has effective explosion-proof and flame-retardant properties, eliminating unsafe factors on oxygen pipelines.

Key words:

Classification:

Check Valve Series

Keyword： Butterfly Check Valve

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liangbovalve@163.com

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Details

Principle of the Butterfly Check Valve

The butterfly-type check valve is installed in piping systems and primarily serves to prevent backflow of the medium. A check valve is an automatic valve that opens and closes based on the pressure of the flowing medium. Traditionally in China, the most commonly used models have been the H44 flanged swing check valve and the H41 flanged lift check valve. However, these conventional check valves are bulky, create significant fluid resistance, generate high water-hammer pressures when closing, and are difficult to install and maintain—resulting in a relatively short service life.

Our company has addressed the issues inherent in traditional check valves by developing and launching the H76 series of double-disc swing-type lug check valves and the H71 series of lift-type lug check valves. These products were designed based on both the U.S. API standard and the German DIN standard, leveraging our company's extensive experience accumulated over many years in valve testing, research, development, design, and manufacturing. After years of successful application across industries such as petrochemicals, metallurgy, power generation, light industry, and food processing—as well as integration into equipment supplied by leading manufacturers—these valves have consistently delivered outstanding performance and earned high praise from users.

Butterfly Check Valve: Structural Features

1. It has a short structural length—only 1/4 to 1/8 of that of a traditional flanged check valve.

2. Compact in size and lightweight, weighing only 1/4 to 1/20 of a traditional flanged check valve;

3. The valve disc closes rapidly, resulting in low water-hammer pressure;

4. Can be used for both horizontal and vertical pipelines, making installation convenient;

5. Smooth flow channels with low fluid resistance;

6. Quick response and excellent sealing performance;

7. Short valve stem travel and minimal valve-closing impact force;

8. Overall structure is simple, compact, and aesthetically designed;

9. Long service life and high reliability.

Basic Parameters of Butterfly Check Valves

	Nominal pressure	PN 1.0 MPa, PN 1.6 MPa, PN 2.5 MPa, PN 4.0 MPa, PN 6.4 MPa, PN 10.0 MPa
	Model	H76H-C	H76W-P	H76W-P8	H76W-P3	H76W-R
Main Parts Materials	Valve Body	WCB (A105)	ZG1Cr18Ni9Ti	CF8 (304)	CF8 (304L)	ZG1Cr18Ni12Mo2Ti
	Valve leaf	CF8	CF8	CF8	CF3	CF8M
	Valve shaft	2Cr13	1Cr18Ni9Ti	0Cr18Ni9	00Cr19Ni10	1Cr18Ni12Mo2Ti
	Spring	0Cr18Ni9	0Cr18Ni9	0Cr18Ni9	00Cr19Ni10	0Cr17Ni12Mo2
Applicable Operating conditions	Applicable Medium	Water, Steam, Oil products, etc.	Corrosive media such as nitric acid		High oxidizing power Medium	Corrosive media such as acetic acid
Applicable Operating conditions	Applicable Temperature (℃)	-29 to 425	-196 to 540		-196 to 425	-196 to 540

Main External Dimensions of the Butterfly Check Valve

Pressure level	Caliber			Dimensions (mm)			Weight (kg)		Piping Flange (For Reference)
	DN	L	D		D 3	D 2		In the bolt hole Circle diameter D 1	Number of bolts	Bolt diameter d		Bolt length L 1
	DN	L	D		D 3	D 2		In the bolt hole Circle diameter D 1	Number of bolts	in	mm	RF	RJ
Class 150 PN 2.0 MPa	50	60	103		56	51	2	120.5	4	5/8	M16	140	155
	65	67	122		73	65	3	139.5	4	5/8	M16	150	165
	80	73	135		88	80	4	152.5	4	5/8	M16	160	175
	100	73	173		108	102	6	190.5	8	5/8	M16	170	185
	125	86	195		132	127	8	216.0	8	3/4	M20	190	205
	150	98	220		160	152	13	241.5	8	3/4	M20	205	220
	200	127	277		210	203	25	298.5	8	3/4	M20	240	255
	250	146	337		266	254	39	362.0	12	7/8	M24	270	285
	300	181	407		310	305	54	432.0	12	7/8	M24	310	325
	350	184	448		355	350	80	476.0	12	1	M27	325	340
	400	191	512		405	400	117	540.0	16	1	M27	340	355
	450	203	547		455	450	138	578.0	16	1 1/8	M30	365	380
	500	219	604		505	500	163	635.0	20	1 1/8	M30	385	400
	600	222	715		605	600	331	749.5	20	1 1/4	M33	405	420
	700	305	773		700	700	380	795.5	40	3/4	M20	455	-
	750	305	824		750	746	425	846.0	44	3/4	M20	455	-
	800	305	878		800	796	560	900.0	48	3/4	M20	460	-
	900	368	983		910	898	640	1009.5	44	7/8	M24	540	-
	1050	432	1142		1055	1050	960	1171.5	48	1	M27	625	-
	1200	524	1302		1205	1200	1400	1335.0	44	1 1/8	M30	740	-
Class 300 PN 5.0 MPa	50	60	110		58	51	3	127.0	8	5/8	M16	155	175
	65	67	128		73	65	4	149.0	8	3/4	M20	175	195
	80	73	147		88	80	6	168.5	8	3/4	M20	190	210
	100	73	179		108	102	8	200.0	8	3/4	M20	195	215
	125	86	214		132	127	15	235.0	8	3/4	M20	215	235
	150	98	249		160	152	18	270.0	12	3/4	M20	230	250
	200	127	305		210	203	31	330.0	12	7/8	M24	280	300
	250	146	359		266	254	51	387.5	16	1	M27	315	335
	300	181	420		310	305	77	451.0	16	1 1/8	M30	365	385
	350	222	483		355	350	117	514.5	20	1 1/8	M30	410	430
	400	232	537		405	400	190	571.5	20	1 1/4	M33	435	455
	450	264	594		455	450	200	628.5	24	1 1/4	M33	475	535
	500	292	652		505	500	265	686.0	24	1 1/4	M33	510	585
	600	318	772		608	600	410	813.0	24	1 1/2	M39	560	-
	750	368	882		740	735	660	921.0	36	1 3/8	M36	650	-
	900	483	1044		880	873	1020	1089.0	32	1 5/8	M42	800	-
	1050	568	1196		1045	1035	1540	1244.5	36	1 3/4	M45	920	-
	1200	629	1365		1190	1179	2260	1416.0	40	1 7/8	M48	1010