A disc features inside a piston/lift check valve that lifts up off its seat by higher pressure of the upstream fluid to flow to the outlet or downstream side. When the pressure drops, gravity or higher downstream pressure causes the disc to lower onto its seat, shutting the valve to stop reverse flow.
A disc features inside a piston/lift check valve that lifts up off its seat by higher pressure of the upstream fluid to flow to the outlet or downstream side. When the pressure drops, gravity or higher downstream pressure causes the disc to lower onto its seat, shutting the valve to stop reverse flow.
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