Abstract: A combination flow control, shutoff and pressure relief device comprises a body with a movable spool and inlet and outlet portions. The spool supports a spring loaded valve head that forms an internal fluid chamber around one end when the handle fixed to the other end is in the closed position. An orifice in the body inlet portion is progressively opened from a complete shutoff position by rotation of the spool within the body to provide flow into the fluid chamber. When fluid pressure within the internal chamber exceeds a preselected spring force on the valve head, the latter opens to provide pressure relief. Regulation of the fluid pressure in the chamber and thus in the outlet can be maintained at the preselected level by controlling the size of the inlet orifice at a point just below the actuation level of the valve spring.