Hydraulic Vane Pump as the name suggests is embedded with a hydraulic system, which is found everywhere. Right from elevators to pumps, the hydraulic system is prominent due to its excellence in lifting immense loads and operating at high speeds. A variety of hydraulic pumps are available today, ranging from gear pump, piston pump to vane pumps, used in automotive industry, aerospace industry, food industry, etc. 

Hydraulic vane pumps create pressure by forcing hydraulic fluid like petroleum, mineral- or vegetable-based oils into an ever-smaller area before releasing it back into the system. They can handle flowing of low to medium viscosity fluids through the valve and to the hydraulic cylinder. Thus, it is a prerequisite to control when the pressure generated by a constant displacement pump is too high.

For this, Pressure Relief Valves are used in Hydraulic Vane Pump to limit the pressure from building higher than a predefined amount. They are considered a safety component for variable vane pumps as they could potentially cause damage to staff members or machinery. 

All About Safety Relief Valves

Safety relief valves help prevent catastrophic failure due to imbalance of pressure. It should always be installed with a hydraulic vane pump as pressure of the fluid is likely to be exceeded. On a high key, it has the capability to remove the excess energy that fluids put into variable vane pumps to restrict appliance failure and ensure people’s safety. Thus, safety valves help to release fluid, gas, or steam once normal conditions have been restored.

There can be multiple reasons why the pressure in hydraulic vane pumps or variable vane pumps can exceed a predetermined limit. Let’s have a quick glance on all of them.

Significant Reasons for Overpressure in Hydraulic Vane Pumps

• Blockage in fluid discharge
• Exposure to external fire
• Thermal expansion in vane pumps 
• Chemical reaction in fluids 
• Rupture of heat exchanger tube

Pressure Relief Valves

Pressure relief valve is one of the most significant types of safety valve used in hydraulic and variable vane pumps for controlling the excess pressure within the hydraulic circuit. However, the primary purpose of installing Shriank pressure relief valve is protection of life and property by venting fluid from over pressurized hydraulic systems. The sole power source of PRVs is the process fluid. Let’s have insights into how PRVs or safety valves work in hydraulic systems.

How Pressure Relief Valves Work in Hydraulic Vane Pump

Pressure Control or Relief Valves are used to reduce the downstream pressure whenever it releases surplus pressure.

They consist of a diaphragm/ball, spring-loaded mechanism, and a nozzle. It maintains pre-set pressure with a spring-loaded mechanism. How? Well, the action of the spring loaded mechanisms is quite simple whenever the pressure surpasses the pre-set level. The spring-loaded mechanism will push the diaphragm when pressure exceeds. Thus, the orifice will open and let the pressure drop to its former level. After that, it will close the orifice.

They are designed to keep pressure in control or at optimum level. They will act rapidly to exhaust air out of the hydraulic vane pumps once the pressure is normal. This makes them a top choice for people’s safety as well as protection of air compression systems. 

Final Thoughts 

Mostly, safety valves are the last line for high and low pressure in hydraulic or variable vane pumps. Thus, it is indeed essential that both pressure release valves and safety valve should be in optimum condition and of high quality so that it can operate under all conditions.

You can find Shriank HYDRANK range of pressure relief valve. They offer both REXROTH and YUKEN design pilot operated relief valve and solenoid operated relief valve.