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Thermal Shutoff Valve
Selection Guide

About Thermal Shutoff Valves

Assured Automation supplies a complete range of Thermal Safety Shutoff Valves with fusible links. Our stock inventory includes Thermally activated Emergency Isolation Valves, and FM approved FireChek® thermal exhaust valve.

For some applications and in specific industries some of these valves are referred to as EBV (Emergency Block Valves) (API RP 553 Classes A, B,& C), EIV (Emergency Isolation Valves ) (API RP 533 Class D), SDV (Shut Down Valve) or ESV, ESD or ESDV (Emergency Shutdown Valve), Emergency Shutoff valves (ESOV) (NFPA 54), automatic-closing heat-actuated valves (OSHA 29 CFR 1910.106), Firesafe Valves (Factory Mutual FM Class 7440) and Safety Shutoff Valves (FM Class 7400). They are also sometimes referred to as ESDV (Emergency Shutdown Valves) or ROSoV (Remotely Operated Shutoff Valves).

Series Description
Heat activated pneumatic shutoff valve used to close the supply air line and vent a spring return actuator to allow return to failsafe position. Adds thermal shutoff to any spring return pneumatically actuated valve without affecting normal operation.
FM Fire-Safe Valve assembly with a spring loaded actuator held in operational position by a fusible link. Link releases at trigger temperature and spring actuates valve to emergency position. entire assembly is dedicated to this thermal shutoff function.
ESD Emergency Shutdown Valves. complete spring-return, pneumatically actuated process control valve assemblies that incorporate the FireChek® listed above to provide Emergency Shutdown.
FireChek® Series

Heat Activated Pneumatic Shutoff Valves

Key Features
  • Rapidly responds to temperature rise, NOT flames
  • Vents actuator air pressure to return to failsafe
  • Closes actuator air supply line
  • Needs no power source, self activates
  • Compatible with ALL pneumatic actuators
  • No contact with process fluids
  • Easy to test and reset
  • Reliable, intrinsic triggering
  • Easily retrofit, installs in minutes
  • Valve Made in the USA
  • FM Approved
    FM Approval through Memry Corp.


  • Body: Stainless Steel
  • Seals: BUNA
  • Thermal Insulators: DELRIN®
  • Sensor/Trigger Coil: MEMRY®

End Connections

  • NPT: 1/4" female
  • Compression: 1/4"

Actuation Temperatures

  • Standard: 165°F
  • Optional: 135°F, 150°F

Sizes & Models

  • FireChek
  • FireChek with Quick Exhaust
  • FireChek with High Flow Pilot Valve
  • FireChek with Solenoid Operated High Flow Pilot Valve
FM Fire-Safe Series

Fire-Safe Valves with Thermal or Electro-thermal Shutoff

Key Features
  • Fire-Safe to API 607
  • U.L. listed Thermal or Electro-thermal Fusible Links
  • Removable Handle for Manual Operation
  • FM Approved

Valve Types

  • Ball Valve with NPT Connections (1/2" to 2")
  • Ball Valve with 150# or 300# ANSI Flange Connections (1/2" to 4")
  • Butterfly Valve with 150# Wafer or Lugged Connections (3" and 4")


  • Body: Stainless Steel or Carbon Steel
  • Seals: TFE/SS/Graphite - Fire-safe

Actuation Temperatures

  • 165°F, 212°F, 286°F, 360°F, 500°F

Temperature and Pressure

  • Varies Depending on Valve Series Chosen

ESD Series

Emergency Shutdown Valves (Pneumatically Operated Valves with FireChek Thermal Shutoff)

emergency shut down valve
Key Features
  • Fire-Safe to API 607-5
  • Spring Return Actuator with FireChek Thermal Shutoff
  • Solenoid for Actuator Control & Remote Shutoff
  • Modulating Positioner Optional
  • Manual Override Optional
  • Variety of Limit Switches Optional


  • Body: Carbon Steel or Stainless Steel
  • Seats: TFM or 50/50
  • Seals: TFM or Graphite

End Connections

  • 150# or 300# ANSI Flange: 1/4" to 8"
  • NPT: 1/2" to 4"
  • Socket Weld with Heat Sink: 1/2" to 4"

Temperature and Pressure

  • Max. Temperature:
    50/50: 525°F
  • Max. Pressure:
    275 PSIG
    300#: 700 PSIG

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Please contact us to verify any information that is critical to your application.