Everything you need to know about pressure relief valves

Author : JohnSmith
Publish Date : 2020-11-09 06:07:41


Everything you need to know about pressure relief valves

Purifiers for direct acting spring relief valve design continued to provide heat and power locomotives, river boats and pumps in response to the widespread use of steam billers. Steam boilers are less common today, but safety relief valves are an important component in a system with pressurized vehicles to prevent damage or catastrophic failure.

Each application made by the pressure relief valve manufacturers India has its own specific requirements, but before entering the selection process, let’s take a look at the operating principles of a specific direct acting pressure valve.

Reliable relationship under pressure

Safety relief valves India has three functional elements:

  • Valve element, usually spring load parrot valve.
  • Sensing element, usually diaphragm or piston.
  • Reference force element. Usually a spring.

In operation, the pressure relief valve normally remains closed until the pressure above the pressure reaches the desired set pressure. The valve will open when the pressure is set, and will continue to open more, allowing more flow when the pressure increases. When the upper pressure drops a few psi below the set, the valve will close again.

(1) Valve element (parrot valve)

Typically, a pressure relief valve appoints a spring load "P" puppet valve as the valve element. The P pet puppet includes an elastomeric seal or, in some high-pressure designs, a thermoplastic seal, which is configured to seal the valve seat. And apply opposing forces to the upstream pressure valve.When the pressure of the upstream pressure exceeds the force of the spring, the poppet moves away from the valve seat which allows fluid to pass through the outlet port. Closes.

(2) Sensing element (piston or diaphragm)

Piston-style designs are used when relief pressure is required, when stiffness is a concern, or when relief pressure stiffness is not tolerated. The piston design is more sluggish than the diaphragm design due to friction with the piston seal.

(3) Reference force (spring)

The reference force element is usually a mechanical spring. This spring provides force on the sensing element and acts to close the valve. Many pressure relief valves are designed with an adjustment that allows the user to adjust the relief pressure set-point by replacing it with a reference spring.

Design parameters

  • Pressure of relief

Expected relief pressure is an important factor in determining which product is most suitable for application, when created by the safety relief valve manufacturers India.

  • Flow requirements

What is the maximum flow rate for the application? How different is the flow rate? Porting configuration and effective if refs are also important matters.

  • Liquids used (gas, liquid, toxic or flammable)

The chemical properties of the liquid must be considered before determining the best material for your application. Each fluid will have its own specific characteristics, so care must be taken to select the appropriate body and seal material that will be exposed to the fluid. Parts of the pressure relief valve in contact with the fluid are referred to as "wet" components. If the fluid is flammable or hazardous in nature, the pressure relief valve should be able to discharge safely.

  • Size and weight

Space is limited and weight is a factor in many high-tech applications. Some people specialize in small components and should be consulted. The choice of material, especially the body components of the relief valve, will affect the weight. Also carefully consider the port (thread) size, adjustment styles and mounting options as this will affect the size and weight.



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