Wafer Butterfly Check Valve

May 19, 2014

Wafer butterfly check valve has short face to face dimension (only 1/4~1/8 of the conventional flange check valve), small volume, light weight (1/4~1/20 of conventional flange check valve). Wafer butterfly check valve can be used for horizontal pipe lines and vertical pipe lines. The check valve also has the advantages of compact structure, beautiful modeling, long service life and excellent reliability.

Check valve is used for pipeline to avoid refluence of medium. Check valve is an automatic valve that open and close by the medium pressure. In the past, flanged swing check valve and flanged lift check valve are widely used, but those valves have the disadvantages of large volume, fluid resistance, high water hammer pressure, hard installation and short service life.

For that, based on American API Standards and German DIN Standards, combining with abundant experience on research, design and manufacturing, we develop wafer butterfly check valve wich is welcome in petroleum, metallurgy, power and other industries.

Characteristics:

1. Short face to face dimension(only 1/4~1/8 of conventional flange check valve);

2. Small volume, light weight (1/4~1/20 of conventional flange check valve);

3. The disc closes rapidly,and has small water hammer pressure;

Can be used for horizontal pipe lines and vertical pipe lines. 4. Convenient utilization;

5. Free channel and small fluid resistance;

6. Excellent sealing;

7. Short stroke of valve disc and small impact force when closing valve;

8. Compact structure, beautiful modeling;

9. Long service life and reliability.

Comparison between Wafer Butterfly Check Valve and Conventional Check Valve

Structure	Wafer butterfly check valve	Conventional check valve
Water hammer pressure	Small. Valve disc has short stroke. With assistance of spring, it can be closed rapidly.	Large. It needs long time to close for its long stroke.
Water hammer pressure	Only 1/2~1/5
Size & Weight	Short face to face dimension, small volume, light weight convenient for utilization and save cost	Long face to face dimension, large volume and heavy weight
Size & Weight	Face to face dimension: only 1/4~1/6 of conventional flange check valve; Weight: 1/4~1/10 of conventional flange check valve
Fluid Resistance	Quite small; fluid drag coefficient: 2.6～0.7 Larger caliber, smaller fluid drag coefficient	Quite small, fluid drag coefficient: 1.3~3. It cannot be opened completely with low pressure which caused large fluid resistance. Larger size, bigger fluid drag coefficient.
Installing	Can be installed horizontally or vertically or vertically, without support for light weight.	Can be installed horizontally and vertically. Support is needed for large size for heavy weight
Pressure	Quite low. The valve can be opened completely under low differential pressure.	High. Valve disc only can be opened completely with large differential pressure
Reliability	Compact and simple structure having long service life and excellent reliability, for low impact fore and water hammer pressure when closing valve.	High impact fore and water hammer pressure cause damage to valve easily.

Components Materials

	Nominal Pressure	PN1.0MPa, PN1.6MPa, PN2.5MPa, PN4.0MPa, PN6.4MPa, PN10.0MPa
	Model No.	H76H-C	H76W-P	H76W-P8	H76W-P3	H76W-R	H76W-R8	H76W-R3
Components Materials	Valve Body	WCB(A105)	ZG1Cr18Ni9Ti	CF8(304)	CF8(304L)	ZG1Cr18Ni12Mo2Ti	CF8M(316)	CF3M(316L)
	Valve Disc	CF8	CF8	CF8	CF3	CF8M	CF8M	CF3M
	Valve Stem	2Cr13	1Cr18Ni9Ti	0Cr18Ni9	00Cr19Ni10	1Cr18Ni12Mo2Ti	0Cr17Ni12Mo2	00Cr17Ni14Mo2
	Spring	0Cr18Ni9	0Cr18Ni9	0Cr18Ni9	00Cr19Ni10	0Cr17Ni12Mo2	0Cr17Ni12Mo2	00Cr17Ni14Mo2
Application Conditions	Applicable Medium	Water, vapour and oil, etc.	Nitric acid		Strong oxidizing medium	Acetic acid		Carbamide and other corrosive medium
Application Conditions	Applicable Temperature(℃)	-29～425	-196～540		-196～425	-196～540		-196～455

Dimensions

Pressure	Size		Dimensions(mm)				Weights(kg)	Companion Flange(only for consulting)
	NPS	DN	L	D	D 3	D 2		Bolt Hole Diameter D 1	Bolt Numbers	Bolt Diameter d		Bolt Length L 1
	NPS	DN	L	D	D 3	D 2		Bolt Hole Diameter D 1	Bolt Numbers	in	mm	RF	RJ
Class 150 PN2.0MPa	2	50	60	103	56	51	2	120.5	4	5/8	M16	140	155
	2 1 /2	65	67	122	73	65	3	139.5	4	5/8	M16	150	165
	3	80	73	135	88	80	4	152.5	4	5/8	M16	160	175
	4	100	73	173	108	102	6	190.5	8	5/8	M16	170	185
	5	125	86	195	132	127	8	216.0	8	3/4	M20	190	205
	6	150	98	220	160	152	13	241.5	8	3/4	M20	205	220
	8	200	127	277	210	203	25	298.5	8	3/4	M20	240	255
	10	250	146	337	266	254	39	362.0	12	7/8	M24	270	285
	12	300	181	407	310	305	54	432.0	12	7/8	M24	310	325
	14	350	184	448	355	350	80	476.0	12	1	M27	325	340
	16	400	191	512	405	400	117	540.0	16	1	M27	340	355
	18	450	203	547	455	450	138	578.0	16	1 1 /8	M30	365	380
	20	500	219	604	505	500	163	635.0	20	1 1 /8	M30	385	400
	24	600	222	715	605	600	331	749.5	20	1 1 /4	M33	405	420
	28	700	305	773	700	700	380	795.5	40	3/4	M20	455	-
	30	750	305	824	750	746	425	846.0	44	3/4	M20	455	-
	32	800	305	878	800	796	560	900.0	48	3/4	M20	460	-
	36	900	368	983	910	898	640	1009.5	44	7/8	M24	540	-
	42	1050	432	1142	1055	1050	960	1171.5	48	1	M27	625	-
	48	1200	524	1302	1205	1200	1400	1335.0	44	1 1 /8	M30	740	-
Class 300 PN5.0MPa	2	50	60	110	58	51	3	127.0	8	5/8	M16	155	175
	2 1 /2	65	67	128	73	65	4	149.0	8	3/4	M20	175	195
	3	80	73	147	88	80	6	168.5	8	3/4	M20	190	210
	4	100	73	179	108	102	8	200.0	8	3/4	M20	195	215
	5	125	86	214	132	127	15	235.0	8	3/4	M20	215	235
	6	150	98	249	160	152	18	270.0	12	3/4	M20	230	250
	8	200	127	305	210	203	31	330.0	12	7/8	M24	280	300
	10	250	146	359	266	254	51	387.5	16	1	M27	315	335
	12	300	181	420	310	305	77	451.0	16	1 1 /8	M30	365	385
	14	350	222	483	355	350	117	514.5	20	1 1 /8	M30	410	430
	16	400	232	537	405	400	190	571.5	20	1 1 /4	M33	435	455
	18	450	264	594	455	450	200	628.5	24	1 1 /4	M33	475	535
	20	500	292	652	505	500	265	686.0	24	1 1 /4	M33	510	585
	24	600	318	772	608	600	410	813.0	24	1 1 /2	M39	560	-
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