Silence check valves

Silence check valves are also popular ones among the various check valves. These valves begin to close as the forward flow diminishes and are fully closed at zero velocity preventing flow reversal and resultant water hammer or shock. Similarly, they are designed incorporating a center guided, spring loaded disc and a short linear stroke that generates a flow area equal to the pipe size.
The operation of the shall not be affected by the position of installation. The valve shall be capable of operating in the horizontal or vertical positions with the flow up or down. And sometimes the heavy duty springs for vertical flow down installations shall be provided. And the valve disc is concave enough to the flow direction providing for disc stabilization, maximum strength, and a minimum flow velocity to open the valve. No matter what, the silence check valve flow way shall be contoured and unrestricted to provide full flow areas at all locations within the valve. And the good tightness should be guaranteed. Actually, there are a lot of choices for the manufacturing materials. Whatever, many testing processes should be taken in order to ensure the performance of the silence check valve.