Surge relief systems are known for their quick speed of response, excellent flow characteristics, and durability in high pressure applications.

Surge relief valves are designed to have an adjustable set point that is directly related to the max pressure of the pipeline/system.

When the product on the inlet of the valve exceeds the set point it forces the valve to open and allows the excess surge to be bled out in to a breakout tank or recirculated into a different pipeline.

So in the event of the surge, the majority of the pressure is absorbed in the liquid and pipe, and just that quantity of liquid which is necessary to relieve pressures of unsafe proportions is discharged to the surge relief tank.

Pilot operated surge systems are typically used to protect pipelines that move low viscosity products like gasoline or diesel.

This style of valve is installed downstream of the pump/valve that creates the surge. The valve is controlled by an external, normally closed pilot valve. The pilot will be set to the desired set point of the system, with a sense line that runs up stream of the valve.

When the upstream process conditions start to exceed the pilot set point, the valve begins to open and relieve the excess pressure until the correct pressure is met causing the valve to close.