Flush valve construction

In a construction for controlling fluid flow through a jacket having a fluid inlet and a fluid outlet, a piston reciprocally movable within said jacket, a valve connected to the piston, a valve seat whereby movement of the piston operates to seat and unseat the valve for controlling passage of fluid between said inlet and outlet, a stop located upstream of said valve, a shaft supporting said stop, a stop seat defined by said jacket adjacent said inlet, and means for adjusting the position of said shaft for thereby seating and unseating said stop to shut off passage of fluid through said jacket independently of said valve, said means for adjusting including a threaded section defined by said shaft, and a threaded bore receiving said threaded section whereby rotation of said shaft moves said stop relative to said stop seat, the improvement comprising an extension of said threaded section of said shaft, a nut supported on said extension of said threaded section, said valve being movable along said shaft between the seated and unseated positions, said nut thereby limiting movement of said valve and piston whereby the amount of fluid flow through the construction can be controlled, and wherein rotation of said shaft also operates to change the position of said nut relative to said valve to thereby change the location where the nut limits movement of the valve with respect to its seated position.