Fisher OSE

The Type OSE slam-shut valve serves to provide overpressure and/or underpressure protection by shutting down the flow to the downstream system. 

Pressure is registered on one side of the diaphragm piston, or bellows and is opposed by the setpoint control spring of the manometric sensing device. The Type OSE slam-shut valve tripping pressure is determined by the setting of the control spring.


  • Two-stage tripping mechanism reduces nuisance tripping caused by vibrations or inlet pressure variations.
  • NPS 1 through 6 (DN 25 through 150) body sizes
  • High accuracy
  • Easy in-line maintenance
  • Water tight
  • Positive shutoff
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