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ASCO™ HOV1B Hydramotor Safety Valves
Hydramotor Valves HOV1B ASCO
The ASCO Series HOV1B are bronze-bodied safety valves electro-hydraulically operated to provide reliable on-off control of fuel oil.
The valves´ spring-loaded, stem-guided PTFE seat opens within 9 seconds of power application and closes within 1 second of power interruption. The valves are agency-approved for fuel oil safety shutoff. The HOV1B Series consist of a flexible two-piece actuator and the valve body design that is ideal for OEMs who want both actuator and body as a set, and for end users and distributors who want to minimize inventory by mixing/matching separate actuators and valve bodies. The HOV 1B Series are suitable for boilers/burners, ovens/furnaces, kilns/incinerators, and heating equipment.
ASCO™ HOV1B Hydramotor Safety Valves


Valve Actuation
Body Material
Fuel Oil
Pipe / Port Size
1/2", 3/4”, 1"
Port Type
2 way - 2/2 Normally Closed
4.5 - 6.0 Cv
120V/60 Hz, 110V/50 Hz, 24V/60Hz
Max Differential / Max Operating Pressure
300 PSI
Operating Environment
Indoor (Type 1) and Outdoor (Type 4)
Standards / Regulations
UL 429, FM 7400, CSA 22.2


  • Self-contained, hermetically sealed, pull-type electrohydraulic actuator has motor/pump unit immersed in oil, reducing wear and enhancing reliability
  • Rugged construction and broad ambient temperature range (-40F to 150F) permit use in challenging environments
  • Type 1 General Purpose enclosure standard, optional Type 4, Watertight
  • HOV1B Series offers offers ½" to 1" NPT and flow range from Cv 4.5 to 6, and operating pressure of 300 psi and operating pressures from 4 psi to 20 psi
  • Visual indication of valve open & closed position is standard
  • Proof of closure switch available is a standard equipment
  • Mountable in any position for installation flexibility
  • UL Listed, FM Approved, CSA Certified


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