Remote actuated flush valve

A hydraulic actuator for use in operating a remotely located flush valve including a housing, fluid inlet and outlet ports in said housing adapted to be connected to a flush valve, said inlet port normally being under fluid pressure derived from the flush valve, passage means in said housing connecting said ports,

• a retainer member attached to said housing and positioned in said passage means,
• a sleeve positioned in said passage means and in coaxial alignment with said retainer member,
• a stem reciprocally positioned in said retainer and said sleeve and said stem extending outward from said housing,
• first and second seal members positioned on said stem, said first seal member being located closer to said inlet port than said second seal member,
• said first seal member being loosely held in said retainer member and a first seat defined by said retainer member in said passage means for said first seal member,
• a flexible second seat member positioned in said passage means for contact by said second seal member,
• support means for said second seat member located on the interior surface of said sleeve, said support means comprising an annular shoulder and a relieved area, said relieved area being downstream of said shoulder to prevent pressure build-up downstream of said second seat member,
• spring means positioned in said passage means and urging said sealing members toward said seats,
• said first and second seal members being positioned on said stem in spaced relationship whereby said first seal member is in an open position when said second seal member is in a sealing position, fluid pressure at said inlet urging said first seal member, after removal from said stem, against said first seat to close communication between said inlet and outlet ports.