Everyone knows that there are two types of air pressure safety valves
, which are spring-type air compressor safety valves and rod-type air compressor safety valves. In the subdivision of air compressor safety valves, there are: impulse safety valve, pilot-operated air compressor safety valve, safety switching valve, safety decompression valve, static weight safety valve, etc. The spring-type air compressor safety valve mainly relies on the force of the spring to work. There are closed and non-closed spring-type safety valves. Generally, the flammable, explosive or toxic medium should be closed, and steam or inert gas can be used. The non-closed type is selected, and there are spring-loaded safety valves with and without a wrench. The lever type safety valve mainly relies on the force of the lever hammer to work, but the large size of the lever type safety valve often limits the selection range. When the temperature is high, choose a safety valve with a radiator. The main parameter of the air compressor safety valve The main parameter of the air compressor safety valve is the displacement, which is determined by the diameter of the valve seat and the opening height of the valve disc. According to the different opening heights, it is divided into micro-opening and full-opening two types. The slightly open type means that the opening height of the valve disc is 1/40 ~ l/20 of the throat diameter of the valve seat. Full lift means that the opening height of the valve disc is 1/4 of the throat diameter of the valve seat. The working principle of the air compressor safety valve The safety valve plays a role in safety protection in the system. When the system pressure exceeds the specified value, the safety valve is opened, and part of the gas in the system is discharged into the atmosphere, so that the system pressure does not exceed the allowable value, so as to ensure that the system does not have an accident due to excessive pressure. Safety valve is also called overflow valve. The figure shows several typical structural forms of safety valves. Figure a is a piston safety valve, the valve core is a flat plate. The air source pressure acts on the piston A. When the pressure exceeds the safe value determined by the spring force, the piston A is pushed open, and a part of the compressed air is discharged into the atmosphere from the valve port; when the air source pressure is lower than the safe value, the spring drives The piston moves down, closing the valve port. The selection of the air compressor safety valve is determined by the operating pressure to determine the nominal pressure of the air compressor safety valve, the operating temperature determines the operating temperature range of the safety valve, and the calculated constant pressure value of the safety valve determines the constant pressure range of the spring or lever. Then determine the material and structural type of the safety valve according to the medium used, and then calculate the throat diameter of the safety valve according to the discharge volume of the safety valve. The following are general rules for safety valve selection. (l) Hot water boilers generally use non-closed micro-opening safety valves with wrenches. (2) Steam boilers or steam pipelines generally use non-closed full-open safety valves with wrenches. (3) For liquid incompressible media such as water, a closed micro-opening safety valve or a safety relief valve is generally used. (4) High-pressure feedwater generally uses closed full-open safety valves, such as high-pressure feedwater heaters, heat exchangers, etc. (5) Compressible media such as gas generally use closed full-open safety valves, such as gas storage tanks, gas pipelines, etc. (6) Class E steam boilers generally use dead-weight safety valves. (7) Pulse-type safety valves are generally used in large-diameter, large-displacement and high-pressure systems, such as temperature reduction and pressure reduction devices, power station boilers, etc. (8) Built-in safety valves are generally used in train tankers, automobile tankers, and storage tanks that transport liquefied gas. (9) Hydraulic safety valve is generally used at the top of the oil tank, which needs to be used in conjunction with the breathing valve. (10) Pilot-operated safety valves are generally used for underground drainage or natural gas pipelines. (11) A safety return valve is generally used on the liquid-phase return pipeline at the outlet of the tank pump of the LPG station. (12) Negative pressure or systems that may generate negative pressure during operation generally use a vacuum negative pressure safety valve. (13) Bellows safety valves are generally used for containers or pipeline systems with large fluctuations in back pressure and toxic and flammable. The above is the description of Lianke Valve Co., Ltd. editor on how to choose the safety valve of the air compressor. Lianke Valve Co., Ltd. is a company dedicated to valve innovation and manufacturing. Strive to bring more practical valves to everyone. If there is anything you don't understand, please feel free to come to us.
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