Elements of the Safety Relief Valves:
- Valve Element: Safety relief valves employ a spring loaded “poppet” valve as a valve element. In operation, the spring and upstream pressure apply opposing forces on the valve. When the force of the upstream pressure exerts a greater force than the spring force, then the poppet moves away from the valve seat which allows fluid to pass through the outlet port.
- Sensing Element: This senses when the fluid has reached the desired limit and self closes during normal service operations.
- Reference Force Element: The reference force element is usually a mechanical spring. This spring exerts a force on the sensing element and acts to close the valve. Many pressure relief valves are designed with an adjustment which allows the user to adjust the relief pressure set-point by changing the force exerted by the reference spring.
Operation of Safety Relief Valves:
In operation, the pressure relief valve remains normally closed until pressures upstream reaches the desired set pressure. The valve will crack open when the set pressure is reached, and continue to open further, allowing more flow as over pressure increases. When upstream pressure falls a few psi below the set pressure, the valve will close again.
Importance of Safety Relief Valves:
- Helps in restoring of fluid and not wastage.
- Protection of life, property, and the environment.
- Relieve excess pressure from vessels or equipment and to prevent the further release of fluid.
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