Hoke 7 Series high performance, bi-directional ball valves exceed 50,000 cycles (For best results use a filter upstream to the valve. Dirty, errosive and corrosive fluids may affect the cycle life of the valve, cycle life is based on working pressures less than 150 psig.) with Zero leakage per API 598. The 7 Series includes an energized PTFE stem seal and live loaded seats which require no adjustment over the life of the valve. 2-way valves can be configured for unidirectional flow by replacing standard seat rings with opposing curved disc spring seats. 7 series come standard in 316 stainless steel, and special alloys when requested. A variety of handles and remote actuation packages are available.