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ASCO™ Series H137 Hydramotor Valves
The ASCO Series H137 is a cast-iron bodied safety shutoff valve with electrohydraulic actuator for on-off control of combustion gas.
It is designed for boilers, industrial furnaces, dryers, dehydrators, large conversion burners, air heaters, and similar applications. The self-contained Hydramotor actuator is a powerful, pull-type hydraulic ram providing output force of 1,400 pounds to fully open the valve. Upon current interruption, dual-redundant relief valves dump hydraulic pressure, closing the valve in 1 second or less.
ASCO™ Series H137 Hydramotor Valves


Valve Actuation
Body Material
Cast Iron
Natural Gas
Pipe / Port Size
2 "; 2 1/2 "; 3 "
Port Type
Flange, NPTF
2 way - 2/2 Normally Closed
120 AC
Max Differential / Max Operating Pressure
Vacuum to 150 PSIG
Operating Environment
Hazardous, Indoor, Outdoor
Standards / Regulations
CSA, FM, Type 4, Type 7, Type 9, UL


  • Broad ambient temperature range suitable for hot (150° F/66° C) or frigid (-40° F/-40° C) environments
  • Slow- or fast-opening constructions make it suitable for a variety of applications
  • Type 1 General Purpose enclosure standard, optional Type 4 Watertight enclosure available for outdoor or indoor wash down installations
  • Rugged construction ensures high reliability and durability
  • Visual indication of valve open & closed position is standard
  • Optional electrical interlock proof of closure switch is available
  • Mountable in any position for installation flexibility
  • UL Listed, FM Approved, CSA Certified