Fisher internal valves have gained acceptance as the primary shutoff valve, excess flow valves, and the back check valves. They are installed in the inlets and outlets of pressure vessels and piping systems to control the flow of LPG, NH3 and NGL’s. It features a patented rapid equalization bleed area which provides fast valve response for quick opening by moving the flow area away from the stem and through the poppet.
Each threaded internal valve has a compact, single-piece body design for use in liquid and vapor bobtail, transport and bulk plant applications. They can be actuated manually, by cable controls or by use of pneumatic cylinders.
