It is mounted on the water pump's outlet pipeline of the high buildings and other water supply systems to prevent of the medium's back-flow and the water hammer and water shock.

1. Good effect of water hammer removal. Integrating the technical principles of water hammer removal by means of slow open, quick close and slow close, so as to prevent of the water hammers at both pump start and stop.
2. Easy operation. The valve will open or close automatically as per the operation procedures of the pump, once operates the On-Off button of the pump's motor.
3. Good effect of energy saving. The valve body is designed as full-path straight-flow type, resulting in small pressure loss, big flow, small volume and light weight.

DN	L	D			D1			n-d			H
		1.0Mpa	1.6 (Mpa	2.5 Mpa	1.0Mpa	1.6 Mpa	2.5 Mpa	1.0Mpa	1.6 Mpa	2.5 Mpa
50	205	165	165	165	125	125	125	4-18	4-18	4-18	293
65	216	185	185	185	145	145	145	4-18	4-18	8-18	328
80	250	200	200	200	160	160	160	8-18	8-18	8-18	364
100	320	220	220	235	180	180	190	8-18	8-18	8-22	418
125	365	250	250	270	210	210	220	8-18	8-18	8-22	481
150	415	285	285	300	240	240	250	8-22	8-22	8-26	543
200	500	340	340	360	295	295	310	8-22	12-22	12-26	673
250	605	395	405	425	350	355	370	12-22	12-26	12-26	792
300	698	445	460	485	400	410	430	12-22	12-26	12-30	927
350	787	505	520	555	460	470	490	16-22	16-26	16-30	957
400	914	565	580	620	515	525	550	16-26	16-30	16-33	1188
450	978	615	640	670	565	585	600	20-26	20-30	16-36	1218
500	978	670	715	730	620	650	660	20-26	20-33	20-36	1256
600	1150	780	840	845	725	770	770	20-30	20-36	20-39	1600
700	1300	895	910	960	840	840	875	24—30	24-36	24-42	1750
800	1450	1015	1025	1085	950	950	990	24—33	24-39	24-48	1900

Note: Either elastic seat ring sealed gate valve or butterfly valve can be selected in the schematic of installation. Recommend to select the butterfly valve in case of =DN350.