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1 1/4 in. NPT single-stage pressure regulating diaphragm gas valve


1 1/4 in. NPT single-stage pressure regulating diaphragm gas valve

  • Product Info
  • Literature


V4943/8943B, C, N are Single-stage Pressure Regulating Valve;These valves are used on boilers, unit heaters, duct furnaces, makeup air and rooftop heaters.


  • Designed for replacement for V4843/V8843;Gas Valves.
  • Suitable for use on atmospheric boilers, commercial water heaters, and rooftop heaters.
  • V4943/V8943B,C,N models are solenoid-operated diaphragm valves that combine the functions of safety shutoff and pressure regulation in a single unit.
  • V4943/V8943B,N are for use with natural gas.
  • V4943/V8943C are for use with LP gas.
  • Valve body of die-cast aluminum with a straight-through pattern.
  • V4943 are used with line voltage, on/off controllers; V8943 are used with 24 Vac thermostats or controllers;
  • Valve closes on power failure; recommended for final shutoff service.

Product Specifications

Dimensions (in.)
6 9/16 in. high x 6 in. wide x 6 in. deep
Dimensions (mm)
167 mm high x 152 mm wide x 152 mm deep
(2) 30" leadwires
Item Type
Upright (horizontal)
60 Hz
Approvals, Underwriters Laboratories Inc.
File No. MH1639, Guide No. YIOZ (60 Hz only)
Approvals, Canadian Standards Association
Certificate No. 158158-1042930, Guide No. 3302-01, 81 (Z21.21, Z21.78)
Electrical Connections
1/4 in. (6 mm) spade terminals (quick connects). 30 in. (762 mm) leadwires and cover for electrical conduit connection provided.
Power Consumption
6.6 VA max
120 Vac
Operating Temperature Range (F)
-40 F to +150 F
Operating Temperature Range (C)
-40 C to +66 C
Current Ratings
0.055 max amps at rated Vac/Hz
Body Pattern
Straight-through, non-offset
Opening Characteristics
Slow Opening 1-stage
Pressure Ratings (psi)
1/2 psi
Pressure Ratings (kPa)
3.4 kPa
Type of Fuel
Pipe Size (inch)
1 1/4 in.
Pipe Size (DN)
Bleed Tapping
5/16-24 UNF
Pilot Tapping
1/8-27 NPT
Valve Opening Time
3 to 25 sec
Valve Closing Time
2 sec max
Pressure Regulator Setpoint (in. wc)
Adj. Range, High Fire-- 3 in. wc to 4.5 in. wc; Factory Setting, High Fire-- 3.5 in. wc