Swing check valve have an articulated mechanism and a disc which leant on surface of slop seat freely . The disc is connected with articulated mechanism to make sure disc can reach right place on seat every time .so that disc have enough space to swing and can contact with seat veritably in full-scale . According to the requirement , disc can be made from metal , metal embed in leather or rubber or compound .when check valve open completely ,fluid pressure have little resistance, therefore the pressure drop through valve is relative small.
Disc of lift check valve is on the seal face of seat .It?