Features and Correct Storage Methods of normal safety valves

Safety valves with Closed bonnet or Open bonnet

The valve bonnet and valve cap are closed for safety valves with closed bonnet. There are two purposes: one is to protect the valve’s inner parts from the damage of the dust or other impurities and there’s no requirement for air sealing test. The other purpose is to prevent the leakage of the poisonous or flammable medium, but the air sealing test is needed for it。The requirement of outlet air sealing test should be marked before ordering if it’s needed. Generally the Air Sealing Test Pressure is 0.6Mpa. The safety valve with open bonnet can be used for high temperature medium such as steam as the open bonnet can help to lower the temperature in the spring chamber.

Safety Valves With Lifting Lever or not

According to the National Boiler Safety Inspection Standard, boiler safety valve should be used with lifting lever and should be done opening test regularly. When the medium pressure is up to 75% of the opening pressure, users can lift the valve disc by lifting the lever so as to check the flexibility of the safety valve opening.

The transportation and storage of the safety valve

The careless and casual transportation and storage of the safety valve before using may affect the valve working performance, and may even cause damage to the safety valve. Safety valves should be packed in a wooden case and fixed in it before delivery. While transportation, strenuous vibration should be avoided and the valves should be stored in dry and ventilated room. Either during transportation or storing the safety valves, both ends of the valves should be sealed with flange cap.