E51/52 Enviro-safe Valve – High Integrity Flanged Valves

Worcester’s Enviro-Safe range of ball valves has a high cycle life at an increased range of temperatures and pressures. At the heart of the valve’s high integrity performance is its dual stem packing. The unique primary seal is designed so that it will always fail in service BEFORE the secondary seal. With a monitoring port drilled through to a lantern ring which is located between the two sealing stages, primary seal leakage can be detected whilst the secondary seals ensure overall integrity. This unique and foolproof stem packing design is live loaded with stainless steel disc springs and has been proven in testing to be bubble-tight on helium even after primary seal leakage. Primary seal integrity can then be restored by simply tightening down the gland plate. The Enviro-Safe features two stem purge bosses. One is drilled and tapped to 1/8″ BSPT standard thread that allows connection of instrumentation/sensing devices, while the optional second port allows through purging between the stem seals. In addition, the one piece body eliminates unnecessary joints. The Enviro-Safe valves are also available in fire-safe versions EF51/52 or sour gas versions to NACE (MR. 0175/ISO 15156). A further benefit allows automated versions to have the actuator removed without affecting the integrity of the valve seals.