Relief Valves

What Is a Pressure Relief Valve?

A pressure relief valve is a safety device that prevents hydraulic system pressure from exceeding a set limit. When pressure reaches that limit, the valve opens to divert fluid, protecting components and ensuring safe operation.

Hydraulic Supply Company offers:

• Pilot-operated valves – Adjustable settings for stable pressure control in steady-load systems

• Direct-acting valves – Rapid response to sudden spikes for immediate overpressure protection

Every valve is built to high manufacturing standards to ensure reliability in demanding applications. Learn more about the industries we serve.

Relief Valve Applications

Our relief valves are used across multiple industries where system protection and performance are critical. Typical applications include:

• Mobile machinery such as loaders, cranes, and utility trucks

• Manufacturing facilities requiring precise hydraulic control

• Agricultural equipment, operating implements, and attachments

• Marine and shipbuilding systems functioning in challenging environments

How to Select and Adjust a Pressure Relief Valve

Choosing the right hydraulic relief valve ensures safety, efficiency, and long service life. Key factors include:

• Pressure range – Match the valve’s min/max settings to your system requirements

• Flow capacity – Ensure the valve supports your system’s maximum GPM

• Valve type – Pilot-operated for stability, direct-acting for quick response

• Port size and configuration – Match the correct NPT size for secure installation

• Adjustment – Use the manufacturer’s screw adjustment to fine-tune pressure settings

For guidance on how to adjust a pressure relief valve or to schedule maintenance, contact us or explore our repair services.