Double Flanged Type Double Disc Swing Check Valve (Api)

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Pressure level	Size		Dimensions(mm)													Pipe flange(for reference)
	NPS	DN	L	D	D1	D2		D3	D4	P	b	Screw Quantity	d1Screw diameterd1		N	Bolt Quantity	Bolt diameter d		BoltlengthL1
	NPS	DN	L	D	D1	RF	RJ	D3	D4	P	b	Screw Quantity	in	mm	N	Bolt Quantity	in	mm	RF	RJ
Class 150 PN2.0MPa ASME B16.47B	8	200	127	345	298.5	270	273	203	210	247.65	27	8	7 /8	22.5	2	8	3 /4	M20	120	135
	10	250	146	405	362	324	330	254	266	304.801	28.6	12	1	25.5	2	12	7 /8	M24	135	150
	12	300	181	485	432	381	406	305	310	381.001	30.2	12	1	25.5	2	12	7 /8	M24	135	150
	14	350	184	535	476	413	425	350	355	396.876	33.4	12	1¹/₈	28.5	2	12	1	M27	145	160
	16	400	191	595	540	470	483	400	405	454.026	35	16	1¹/₈	28.5	2	16	1	M27	155	170
	18	450	203	635	578	533	546	450	455	517.526	38.1	16	1¹/₄	32	2	16	1¹/₈	M30	165	180
	20	500	219	700	635	584	597	500	505	558.801	41.3	20	1¹/₄	32	2	20	1¹/₈	M30	170	185
	24	600	222	815	749.5	692	711	600	605	673.101	46.1	20	1³/₈	35	2	20	1¹/₄	M33	185	200
	28	700	305	835	795.5	762	−	700	700	−	43	40	7 /8	22.5	2	40	3 /4	M20	205	−
	30	750	305	885	846	813	−	746	750	−	43	44	7 /8	22.5	2	44	3 /4	M20	210	−
	32	800	305	940	900	864	−	796	800	−	44.6	48	7 /8	22.5	2	48	3 /4	M20	225	−
	36	900	368	1055	1009.5	972	−	880	893	−	50.9	44	1	25.5	2	44	7 /8	M24	250	−
	42	1050	432	1225	1171.5	1130	−	1040	1045	−	57.3	48	1¹/₈	28.5	2	48	1	M27	275	−
	48	1200	524	1390	1335	1289	−	1166	1200	−	63.6	44	1¹/₄	32	2	44	1¹/₈	M30	305	−

Wafer check valve is applicable for various pipelines with nominal pressure of PN1.0MPa~42.0MPa,Class150~2500 and nominal diameter of DN15~1200mm,NPS1/2-48 and working temperature of-196~540℃ to be used for protecting from medium backflowing.The different materials selection can apply to the medium involving water,steam,oils,nitric acid,acetic acid,strong oxidizing medium and urea etc..

Standard and specification

1.Design and manufacture:API594,API6D,JB/T8937;

2.Face to face and end and end:API594,API6D,DIN3202,JB/T8937;

3.Pressure-temperature ratings ASME B16.34,DIN2401,GB/T12224;

4.Inspection and test:API598、GB/T26480;

5.Pipe flange:JB/T74~90,GB/T9113,HG20592~20635,SH3406,ASME B16.5,DIN2543-2548,GB/T13402.API605.ASME B16.47。

Swing check valve contrast

Structure	H76-type wafer double disc swing check valve	H44 Flange Swing Check Valve univalve
Water hammer pressure	Small disc a short trip,and a spring assisted closure,close the valve fast	Large valve travel,and require a longer closing time
Water hammer pressure	H76 Type H44–type water hammer pressure is only 1/2 to1/5
Dimensions &Weight	Very short structural length,low volume and light mass gives a vast convenient for installation,portage,storage and pipeline arrangement of valves,moreover,it can greatly reduce materials and cut construction cost.	A long length of the structure,volume stupid big,heavy weight
Dimensions &Weight	H76 H44–type length of the structure type is only 1/4 ~ 1/6,H76 Type H44 Type weighs only 1/4 to 1/10
Fluid resistance	Small,fluid resistance coefficient ξ of 2.6 to 0.7,with the valve diameter increases,the fluid resistance coefficient decreases	low flow resistance coefficient ξ is 1.3~3,but under the condition of low pressure,the valve disc can not be completely opened,high fluid resistance. The resistance will be increased as the augment at ion of valve size.
Installation	Can be installed in horizontal or vertical installation,light weight,do not have to set the bearings for the valve	Can be installed in horizontal or vertical installation,the weight of heavy large diameter valves,bearings needs to be set
Opening pressure	Small valve under pressure in a small can fully open	Larger in larger valve can be fully opened under pressure
Reliability	The valve body is of integrated structure,simple and compact,small close down impact,low water hammer pressure,long service life and good reliability	The valve is closed and the huge impact of water hammer pressure is easy to damage the valve