... forservices where dirt or other particles may be present in the fluid, where noise is objectionable,or where positive shutoff is required.Rev. 0 ME-04Page 35 Valves DOE-HDBK-1018/2-93 VALVE ... sametechniques as is used for globe valves. Piston Check ValvesFigure 25 Piston Check ValveA piston check valve, illustrated inFigure 25, is essentially a liftcheck valve. It has a dashpotconsisting ... air motors connected to thepinion shaft decreases the valveoperating time.Rev. 0 ME-04Page 45 Valves DOE-HDBK-1018/2-93 TYPES OF VALVESButterfly Check ValvesFigure 26 Butterfly Check ValveButterfly...