The big aperture silencing check valve uses the outline design conformed to hydraulics so as to get a better faired water path and there is an elevator design used inside it for the guarantee of minimum pressure loss. It is mounted on the outlet of the water pump and can close quickly before the water flow goes back so as to avoid the water hammer, water shock sound and destructive shock and to get the target of silencing, back-flow preventing and equipment protecting. It is used extensively for the systems of the water supply and drainage, fire-fighting, warming industries etc.

DN	DN300~600mm
PN	1.0/1.6/2.5MPa
Working temperature	0℃～80℃
Seal test	1.1times of PN
Casing test	1.5 times of PN

NO	Part	Material
1	Body	GG25
2	Valve disc	QA19-4
3	Bearing	QA19-4
4	Spring	SUS316
5	Elevators	GG25
6	Seat ring	QA19-4

Type	DN mm	D		D1		D2		N-φd		L
		1.0MPa	1.6MPa	1.0MPa	1.6MPa	1.0MPa	1.6MPa	1.0MPa	1.6MPa
CVKR-0300	300	460		400	410	370		12-13	12-28	181
CVKR-0350	350	520		460	470	429		16-23	16-28	184
CVKR-0400	400	580		515	525	480		16-28	16-31	191
CVKR-0450	450	640		565	585	530		20-28	20-31	203
CVKR-0500	500	715		620	650	582		20-28	20-34	219
CVKR-0600	600	810	840	725	770	682		20-31	20-37	222
CVKR-0700	700	895	910	840	840	794		24-31	24-37	280
CVKR-0800	800	1015	1025	950	950	901		24-34	24-40	356
CVKR-0900	900	1125	1125	1050	1050	1001		28-40	28-40	368
CVKR-1000	1000	1230	1255	1160	1170	1112		28-43	28-43	432
CVKR-1200	1200	1455	1485	1380	1390	1328		32-49	32-49	524