Potter Roemer 4042 non-adjustable Reg-U-Matic pressure regulating valve

Potter Roemer 4042 Valve
BrandPotter Roemer
Model Code 4042
Inlet Size (in.)1.5
Model Info

The cast brass valve with rising stem has brass and stainless steel internal parts and aluminum hand wheel. There is also a female NPT inlet and outlet with visual indicator.

It is used as a hose station control to regulate inlet pressure to 300 PSI/20.6 bars. Also may be used as a zone control valve to regulate high-pressure sprinkler, standpipe and combined systems with flow up to 250 FPM/946.3 lpm.


  • 1½"/3.8 cm Female X Female
  • Hydraulic piston design
  • Tamper Proof Pressures
  • Selected pressure control under residual and static conditions
  • Selected pressure control for 20 to 400 PSI/1.3 to 27.5 bars
  • Valve opens fully under low residual supply pressure
  • Monitor Switch Adapter to provide valve supervision

Additional Features:

  • Maximum back pressure does not damage valve components
  • Listed by Underwriters Laboratories as a checking device
  • Listed by Underwriters Laboratories up to 400 PSI/27.5 bars pressure
  • Complete piping system can be hydrostatically tested to 400 PSI/27.5bars without damage to valve
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