Waterous Fire Pump Parts

Waterous Piston Relief Valve


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.

In Stock


A Waterous Piston Relief Valve is a type of pressure relief valve that is used in hydraulic systems. It is a pilot-operated valve, which means that it uses a small pilot valve to control the operation of the main valve. This allows the relief valve to be more sensitive to changes in pressure and to provide a wider range of pressure control.

Waterous Piston Relief Valves are commonly used in fire pump systems to protect the pump and hoses from damage due to excessive pressure. They are also used in other hydraulic systems, such as mobile hydraulic excavators and cranes, to protect the components of the system from damage.

The Waterous Piston Relief Valve consists of two main components: the pilot valve and the main valve. The pilot valve is a small valve that is located upstream of the main valve. It is controlled by a spring and a pressure setting screw.

The main valve is a larger valve that is located downstream of the pilot valve. It is controlled by a piston and a spring. When fluid flows to the main valve from the pilot valve, it pushes against the piston. If the pressure is high enough, the piston will overcome the spring force and open the main valve.

When the main valve opens, fluid flows from the system through the relief valve and back to the tank. This helps to reduce the pressure in the system and prevent damage to the components.

Waterous Piston Relief Valves are available in a variety of sizes and pressure ratings. They are also available in different configurations, such as pump-mounted or remote-mounted valves.

Additional Information

Weight 1 lbs


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Contact Us About This Product

  • This field is for validation purposes and should be left unchanged.

Have a question?


You may also like…

Newsletter Signup

Sign up for our newsletter for great deals, site updates, and other great information once a week.

  • We'll never send spam or share your info
  • This field is for validation purposes and should be left unchanged.

For Immediate Parts, Service or Sales Assistance