Exact purpose of a pressure relief valve? And the most preferable locations to use it.

Key Factors to Consider While Selecting and Sizing Control Valves-min
Key Factors to Consider While Selecting and Sizing Control Valves
August 29, 2022
Advice for Selecting and Maintaining Three-Way Valves for air and hydraulic circuits
October 6, 2022

Exact purpose of a pressure relief valve? And the most preferable locations to use it.


A pressure relief valve that is manufactured in India  is a tool used to guard against excessive pressure on piping and other equipment. Protection from high pressure is the main purpose of safety and relief valves.

Therefore, a pressure relief valve is a safety feature created to protect a pressurised system from an overpressure event while it is in use.

A predetermined set pressure is required for the pressure relief valve (PRV) to open. Therefore, once the system pressure exceeds the predetermined pressure, the PRV pops to release the excess pressure, and then the PRV closes once the excess pressure has been released.The various kinds—also known as pressure relief valves, relief valves, or safety valves—serve the same purpose in varied situations. There are many pressure relief valve manufacturers in India that can offer you high quality material.

What is the Working Principle of pressure relief valve?

Although fairly complicated, a relief valve’s operation is simple to comprehend. A relief valve is frequently put in a hydraulic system after the pump because, when the device opens to bleed extra fluid into a reservoir, it offers a direct, efficient, and quick response.  When the pressure from backpressure or downstream is sufficient to push the poppet or spool open against its spring, the device opens.

In order to lower the pressure in the work port when a relief valve is functioning, excessively pressured fluid is supplied from an open passage to a tank. The force is provided to the base of the spool or poppet as soon as the fluid pressure starts to build.

The poppet or spool is pushed toward the spring by hydraulic force up until a point where the hydraulic force and spring force are equal. As a result, the valve can initially open modestly and just slightly bleed fluid as necessary. However, if the pressure in the downstream direction keeps increasing, the pressure on the spool will eventually cause it to explode.

A pressure relief valve’s functions are listed below.

  • A pressure relief valve‘s main objective is to save pressure vessels or systems from catastrophic collapse. Catastrophic failure, which could be liquid or gaseous, could be disastrous during an overpressure event.
  • In many cases, the last line of defence is a pressure relief valve, which is a safety device. The valve must always be kept in working order and must always be used as intended.
  • The Singer 81-RP pilot senses upstream pressure through a connection to the valve inlet in order for the pressure relief valve to operate. Until the inlet pressure exceeds the pilot setting, the valve and pilot stay closed. When the pressure drops back below the set-point, the valve smoothly closes at a customizable pace, opening quickly to release dangerous overpressure.

What aspects need to be taken into account while choosing a pressure relief valve?

Vapour must be vented at a rate equal to the rate of generation, hence the relief capacity must be adequate. Overpressure is usually caused by a combination of internal and external heat loads, which must be taken into account as the driving source. The air equivalent base must be taken into consideration while choosing the vapour relief devices.

What are the most preferable locations to use a pressure relief valve?

In the petrochemical, petroleum refining, and chemical production industries, this equipment is commonly utilised. Pressure relief valves in India are also widely used in the power production, water supply, and natural gas processing industries.


Find out what needs your valve needs to meet. Two-way valves are good for turning something on or off in a system, while three-way valves can be used to turn something on or off and change the flow of something or mix it. Also, track how often your valve will be open or closed. Order a valve that normally opens in this direction but the other direction when it gets the power to make it last longer.