The safety valve is an automatic discharging pressure unit for pressured equipment, containers or pipe roads. When the protected pressure rises over the permitted value the valve will automatically start to discharge superfluity medium and prevent the system pressure keeping on rising. When the system pressure reduces to a regulated value, the valve will be able to automatically shut and make sure the system in general operation. How to choose the safety valve correctly will be concerned to the users economic benefit and the safe for operators and equipment. The pilot operated safety valve. If the pressure increases and approaches to the set pressure, the inlet of pilot valve closes tightly. If the pressure continues to increase, the outlet opens to discharge some pressure in the main valve chamber.
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