Williams Controls WM778 A1 – PRESSURE-PROTECTION VALVE (118588) – Genuine – NEW


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Williams Controls WM778 A1 – PRESSURE-PROTECTION VALVE (118588) – Genuine – NEW


The WM778 series are normally closed pressure protection valves often used when an auxiliary system is supplied off a primary system. The valve will protect primary system air pressure by reclosing automatically at a nominal 70 PSI (482 kPa). The WM778 is available with or without a filter installed in its inlet port. The filter will reduce ingestion of contaminants. Part Number: 118588 Manufactured by Williams Controls.

  • Normally closed valve until a pressure of 70 psi is reached
  • Valve will automatically close if pressure drops below 70 psi in compliance with the latest revisions to FMVSS121
  • (2) 1/4” NPT ports
  • Max operating pressure: 150 psi
  • Operating temperature range: -40F to 180F
  • Without exhaust filter

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