This valve is a safety device mounted in the pipeline or pump outlet to prevent the pump from inversed running due to the differential water hammer's shock in the pipeline when the pump stops. And it features by the brand-new structure, small fluid resistance, reliable seal, stable open-close, long duration, better energy-saving effect. Suitable for the pipeline related to the systems of water supply and drainage, fire-fighting, warming etc. or the pump outlet to prevent both pump and pipeline from being damaged due to the water hammer produced when the medium flows back and from the silencing effect.

PN(MPa)		1.0	1.6
Test pressure (MPa)	Shell strength	1.5	2.4
	Sealing performance	1.1	1.76
Working temperature		≤80℃
Applicable medium		Clean-water、Sea
Slow-close  time		0~60

Name of parts	Body,	Disc	Stem、Oil cylinder、Oil cork	Spring	Seat
Material	Cast-iron Bowl-shape steel	Bowl-shape     steel、Stainless steel	Stainless steel	Stainless steel	NBR

DN(mm)	PN(mm)	L	D	D1	D2	B	H	H1	n-φd
50	1.0/1.6	160	165	125	100	20	105	110	4-18
65		170	185	145	120	20	110	115	4-18
80		180	200	160	135	22	115	120	4-18/8-18
100		190	220	180	158	24	130	228	8-18
150		210	285	240	212	26	172	230	8-23
200		230	340	295	268	28	210	270	8-23/12-23
250		250	395/405	350/355	320	28/30	240	305	12-23/12-25
300		270	445/460	400/410	370	28/30	264	367	12-23/12-25
350		290	505/520	460/470	430	30/34	294	422	16-23/16-25
400		310	565/580	515/525	482	32/36	324	462	16-25/16-30
450		330	615/640	565/585	532	32/40	351	497	20-25/20-30
500		350	670/715	620/650	585	34/44	379	532	20-25/20-34
600		390	780/840	725/770	685	36/48	434	607	20-30/20-37
700		430	895/910	840	800	40/50	491	702	24-30/24-37
800		470	1015/1025	950	905	44/52	549	792	24-34/24-41
900		510	1115/1125	1050	1005	46/54	600	900	28-34/28-41
1000		550	1230/1255	1160/1170	1110	50/56	655	975	28-34/28-45
1200		630	1455/1485	1380/1390	1330	56/58	770	1140	32-41/32-51