This valve is applied to bump exit pipe of water. As check valve, it can reduce medium regorge and avoids bringing bigger water hammer, so as to protect the pipeline system.

1．  HD7Q41X type whole-hydraulic check butterfly valve adopts whole hydraulic type in control section. Accumulator instead of hammer that can reduce wasting of energy and predigest transmission mechanism. Horizontal or vertical installment is viable.

2．  It is installed at the back of bump and can replace gate valve (butterfly valve) and check valve.

3．  When HD7Q41X is closed, we can adjust the time and switch angle of swiftness cut-off sect and tardiness cut-off sect according to pipeline system characteristic so as to avoid or reduce water hammer and protect system.