Introduction to pressure relief valves

The pressure relief valve is one of the most important types of safety valves. It was designed to control or relieve overpressure levels for optimal functionality in any system, including chemical, petrochemical, power, and oil and gas industries. The valve opens to ease the building pressure by allowing it to escape, the valve then closes when it returns to a stable level. It prevents potential injury, limits the failure of equipment, and controls the pressure in a system with a point of release. There are many kinds of relief valve benefits and features. They are designed to provide high integrity performance and repeatability in the power industry, particularly at high-pressure and high temperatures. Each valve provides a unique level of support and service to ensure that your project or operation runs smoothly, from oil and gas to nuclear power, general industry, or water and wastewater. As long as the valve is properly maintained, there is no risk of injury. Most pressure relief valves fall into the categories of spring-loaded and pilot valves.

The valves are designed as a simple, reliable, system-actuated device to protect against overpressure. They are particularly suitable for applications where there is no excessive backpressure. By adjusting the spring load, the valve can be opened at a variety of pressures. The spring force keeps the disk in place, keeping the valve closed. The disk begins to lift when the line pressure exceeds the set pressure, allowing the fluid to flow through the outlet and relieve the pressure. As the inlet pressure increases, the disk lifts further. By the time the disk reaches its designed value, the valve is fully open, and the system pressure is released. If the system overpressure falls below the spring force, the spring retracts the disk to close the valve, preventing further fluid leakage.

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