The big aperture silencing check valve uses the outline design conforming with hydraulics so as to get a better faired water path and inside of it there is attached with a jetevator design used for the guarantee of minimum pressure loss it is mounted on the outlet of a water pump and can be quickly closed be-fore the water flow goes back so as to avoid producing water hammer, water shock sound and destructive shock and to get the target of silencing, back—flow preventing and equipment protecting．Extensively used for the water supply and drainage, fire-fighting, warming, industrial etc．systems．