Is a pressure reducing valve the same as a pressure relief valve?

A Relief valve will relieve the excess pressure from the pressure vessel or the fluid line, while a Reducing valve will reduce the pressure in the hydraulic or pneumatic circuit.

What are the three types of relief valves?

The three basic types of pressure-relief valves are conventional spring loaded, balanced spring loaded, and the pilot operated. Conventional spring loaded. In the conventional spring-loaded valve (Fig. 1), the bonnet, spring, and guide are exposed to the released fluids.

What is the purpose of reducing valve?

The reducing valve is a regulating device which serves to reduce the air pressure supply to the required delivery pressure. A typical example is shown in Fig. 8.3.

How do relief valves work?

A relief valve works by providing an excessively pressurized fluid an open path to tank with the goal of reducing work port pressure. Relief valves experience pressure rise resulting from the combination of load pressure, backpressure and the energy required to flow through the valve itself.

What is the function of relief valve in hydraulic system?

The pressure relief valve is used in almost every hydraulic system. The function of the relief valve is to limit the maximum pressure that can exist in a system. Under ideal conditions, the relief valve should provide alternative flow path to tank for the fluid while keeping the system pressure constant [1].

Does every pressure vessel require a relief valve?

One of our clients pointed out that as per clause No. UG-125 of ASME Sec VIII, Div 1 (see attached), all pressure vessels designed as per ASME, should be provided with relief valves.

Where is a relief valve used?

Pressure relief valves are used in a wide range of specifications where pressure levels are critical for smooth operations such as oil and gas, petrochemical, and power generation using steam, air, gas or liquid. They are also used in multi-phase applications in refining and chemical processing systems.