Working principle of spring type safety valve

Spring type safety valve is to rely on the power of the spring to press the valve core on the seat, so that the safety valve is closed, and the below of the valve core is subject to the force of the steam upward. In normal operation, the downward compression force of the spring is greater than the upward thrust of the steam, and the valve is closed. When the steam pressure reaches the lifting pressure of the safety valve, the force of the steam on the spool is greater than the force of the spring, so that the spool is jacked up and the safety valve exhausts steam. The lifting pressure of the safety valve can be adjusted by changing the tightness of the spring through the adjusting screw on the upper part of the valve stem. The safety valve has the advantages of convenient adjustment, small volume and weight, large steam discharge capacity, etc., and is suitable for boilers with different parameters and different capacities.