Waterous Fire Pump Parts

Waterous Pilot Valve Sub-Assembly


The Waterous Company has a rich history that spans over 130 years, during which it has established itself as a leading provider of firefighting equipment. The company’s dedication to innovation, quality, and customer satisfaction has allowed it to remain at the forefront of the industry, continually pushing the boundaries of what is possible.

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A Waterous Pilot Valve Sub-Assembly is a relief valve. pre-assembled component of a Waterous pilot-operated  It consists of all of the internal components of the pilot valve, except for the valve body and the external connections. This makes it a convenient and cost-effective way to replace worn or damaged pilot valve components.

The Waterous Pilot Valve Sub-Assembly typically includes the following components:

  • Pilot valve housing
  • Pilot valve spring
  • Pressure nut
  • Ball spring
  • Diaphragm
  • Pressure disc
  • Control piston
  • Guide ring
  • O-rings and seals

The pilot valve sub-assembly is installed in the pilot valve body and connected to the inlet and outlet piping. When the pressure in the inlet piping reaches the set point of the relief valve, the pilot valve opens and allows fluid to flow from the inlet to the outlet piping. This relieves excess pressure in the system and protects the equipment from damage.

The Waterous Pilot Valve Sub-Assembly is a critical component of the Waterous pilot-operated relief valve. It is important to inspect and replace the sub-assembly regularly to ensure that the valve is operating properly.

Additional Information

Weight 1 lbs


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