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ASCO™ Series HV434 Gas Shutoff Valves
The ASCO Series HV434 is a family of low-temperature, stainless-steel shutoff valves with proof of closure for on-off or gas pilot control of commercial and industrial gas burners in harsh environments.
The valves combine a unique double-disc design with a rugged 303 SST GO™ Switch to provide electrical indication of "closed" position. Their low-power DC peak-and-hold constructions reduce energy consumption to 0.85 W (hold). The valves design with large pilot orifice provides consistent and reliable operation. Suitable for applications such as tank heaters, line heaters, incinerators and flare stacks.
ASCO™ Series HV434 Gas Shutoff Valves


2 way - 2/2 Normally Closed
Valve Actuation
Natural Gas
Pipe / Port Size
Body Material
Brass - Nickel Plated
110 AC; 120 AC; 230 AC; 220 AC - 50; 60
Port Type
From 6.0 Cv to 14.0 Cv; From 2.0 Cv to 6.0 Cv; From 1.0 Cv to 2.0 Cv
Max Differential / Max Operating Pressure
Vacuum to 150 PSIG
Operating Environment
Indoor; Outdoor; Hazardous
Standards & Regulations


  • Requires zero minimum pressure differential for robust operation in locations with low supply pressure
  • Solenoid operator and proof-of-closure switch have Class I, Div. 1 enclosures for use in hazardous locations
  • Wide ambient temperature range of -40° F to 125° F (-40° C to 52° C)
  • Maximum operating pressure differential up to 50 psi (3.4 bar)
  • Resilient soft seating for tight shutoff
  • Complies with ANSI/ISA- single-seal requirements
  • Meets the metallurgical requirements of NACE MR0175-2003 (DC only)
  • Offered in 1" pipe size
  • Available in AC and DC voltages