O-Series Pressure Regulating Valve

Brand: Watson McDaniel

The O-Series direct-operated pressure regulators with heavy duty cast iron bodies and internal strainer are suitable for a wide range of applications in the low-to-moderate flow range. Applications include small heaters, humidifiers, various hospital equipment, tire molds, as well as many other general uses.

This style of regulator does not require an external sensing line. Set pressure is controlled by turning an adjustment screw with lock nut that increases or decreases spring force above the diaphragm.
  • Hardened stainless steel seat and disc for extended service life (55 Rc)
  • Phosphor Bronze diaphragm for Steam Service
  • Viton diaphragm for up to 148.9° C (300° F) for Water, Oil & Air Service
  • Double spring available for extended outlet pressure range
  • Integral stainless steel strainer on 3/4" HC, 1", 1-1/4", 1-1/2" & 2"


Enclosure, Body Material

  • Cast Iron

NPT Connection

  • 1” NPT
  • 1/2” NPT
  • 1-1/2” NPT
  • 1-1/4” NPT
  • 2” NPT
  • 3/4” NPT
  • 3/8” NPT

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