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.

Brands:
Worcester Controls

Industries:
Caustic and Chlor-Alkali

The Flowserve Worcester E51/52 Envirosafe valves provides a unique dual stem seal arrangement in a one piece body design. The unique primary seal is designed to ensure it will always fail in service before the secondary seal. This allows for the failure to be detected before any leakage to atmosphere and the live loaded stem packing to be adjusted to reload the primary seal.

The valve uses a one-piece anti-blow out stem design with the body complying with BS5351 wall thickness. For firesafe applications, graphite gland packing can be fitted to provide a certified valve (EF51/52).

This unique valve minimises potential leak paths making the valve ideal for use on a wide range of toxic and harmful applications along with seaching or expensive media.

Features

  • One piece body design to minimise leak paths
  • Unique dual stem seal arrangement
  • Primary stem seal leakage detection
  • Firesafe version available
  • Live loaded gland assembly
  • Wide range of build materials

 

The Flowserve Worcester E51/52 Enviro-safe valve provides a unique dual stem seal arrangement in a one-piece body design. The unique primary seal is designed to ensure it will always fail in service before the secondary seal. The E51/52 Enviro-Safe valve was designed as a range of Class 150/300 ball valves to prevent external leakage in demanding applications such as highly toxic media (phosgene, chlorine etc) or with very costly media where wastage is unacceptable. Experience has shown that repeated valve operation eventually causes wear in the stem sealing area and this leads ultimately to external leakage.

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.

Contact our Valve Specialist Team:

Brendan Merrigan (External) – mob: 087 2598124                           

Internal Team

Vicki McGrath – tel: 021 461 7207

Brian Barry – tel: 021 461 7211

Tim Quigley – tel: 021 461 7209

Conor Foley – tel: 021 461 7206

Ross O’Donovan – tel: 021 461 7230 

Tel: 021 461 7200