Treating Iron

Spring Style Relief Valve

SPM® spring actuated relief valves are direct acting, relying on the system’s hydraulic pressure to open when the preset force of the spring is exceeded. The 2” valve’s operation is a simple balance between the spring loaded keeper which holds the ball in the seat and the inlet liquid pressure acting on the ball. The spring pressure is set by tightening the hex bolt on top which pushes on the keeper, and, in turn, compresses the Belleville springs that force the keeper on the ball. When the inlet fluid pressure rises and overcomes the set spring pressure, the ball is lifted off its seat thereby discharging fluid through the outlet end. Once the pressure of the inlet fluid falls below the set spring pressure, the ball will be pushed back onto its seat and the fluid can pass downstream.

We offer multiple relief valve spring configurations, each optimized for a specific pressure range. Using a valve within the rated pressure range will likely achieve greater discharge capacity and improved repeatability. It is recommended that the valve is sized according to the maximum set pressure that may be required. This approach will help prevent the valve from being used at set pressures greater than the recommended value.

Spring Style Relief Valve Fluid Control

Key Features & Benefits

  • Externally adjustable utilizing hex screw
  • Direct acting, with repeatable usage
  • Seat made from high strength, corrosion resistant material
  • Spring loaded keeper ensures ball seats properly
  • Lock-out tag identifies set pressure and prevent tampering with valve setting


  • Fracking
  • Cementing
  • Well Service


  • Well completion