Pressure relief valve is to prevent equipment and vessels or containers can lead to increased pressure or internal pressure exceeds the limits of the burst of the safety device. Safety valve is a pressure system of pressure vessel, boiler, pressure pipe, use a wide range of safety devices, ensure the safe operation of pressure systems.
When the tank pressure exceeds the design requirements, the valve automatically opens, exhaust gas pressure reduction over inside, to prevent the vessel or pipeline damage. When the pressure inside the container to the normal operating pressure, container is automatically turned off to avoid over-pressure exhaust all the gas, resulting in waste and production interruption. Safety valve mainly comprises a valve seat, the valve (valve) and a loading mechanism is composed of three parts. Some of the valve seat and valve body as a whole, there is and the valve assembly together, it is connected with the equipment. Often associated with valve stem, it is closely linked to the seat. The above is a disc loading mechanism, load size can be adjusted. When the equipment inside the pressure within the pressure range of certain time, internal medium acting on the valve flap is less than the force above the loading body force added to the valve above, the difference is formed between the valve and valve seat sealing force, squeeze the valve seat so, the media can not be discharged. When the equipment inside the pressure exceeds the pressure of work and achieve the safety valve opening pressure, the internal medium acting on the valve above the force is greater than the loading mechanism exerts a force on it, then leave the seat valve, safety valve opens, the equipment medium discharged through the valve seat, if the safety valve emissions than the equipment the safety discharge equipment, pressure is gradually decreased, and the exhaust through a short time, the pressure is reduced back to normal working pressure. The pressure acting on the valve flap above the force is less than the loading mechanism exerts a force on it, then pressed the valve seat, the media to stop the discharge, equipment to maintain the normal operating pressure continues to run. Therefore, the safety valve is the valve flap on the ebb and flow of medium body force and loading force, or turn itself off in order to achieve the purpose of preventing over-pressure device.
2, the selection of safety valve
Nominal pressure safety valve decided by the operating pressure, operating temperature range determined by the operating temperature safety valve set pressure value, by spring or lever set pressure range determined by the safety valve of the calculated, according to the decision to use media materials and structure type safety valve, and then calculated according to the safety valve discharge valve throat diameter. The following general rules for the safety valve selection.
(L) hot water boilers generally is not closed with a safety valve with a wrench weiqi.
(2) steam boiler or steam pipe is not closed with the general use of full-kai-type safety valve wrench.
(3) water and other liquids can not be closed for general use compressed medium inching valve, or safety relief valve.
(4) high-pressure water for general use of closed valve, such as high-pressure feedwater heater, heat exchanger etc..
(5) the gas can be generally closed to the safety valve of compressed media, such as the gas tank, gas pipelines.
(6) e steam boiler safety valve for general use static weight.
(7) large diameter, large discharge capacity and high pressure systems generally use pulse valve, such as temperature and pressure equipment, boiler etc..
(8) the train transporting liquefied gas tanker, tank trucks, tanks and other general use built-in safety valve.
(9) safety valve hydraulic tank top general, be used in conjunction with the breathing valve.
(10) underground water or gas pipeline pilot safety valve for general use.
(11) pipe on the general safety valve reflux liquefied petroleum gas station tank liquid pump outlet.
(12) the system may produce negative pressure or negative pressure during operation of the vacuum valve for general use.
(13) the back pressure and toxic volatile flammable container or piping system is generally used Bellows Safety valve.
(14) medium low freezing point of the system generally used in thermal insulation jacket safety valves.
The article explains:
1, this is the network editors and authors publishing, the publishing the article aims to convey more information to visitors.
2, this article please indicate are from: Jiangyin OuLeiShi valve valve repair factory www.olschina.com
3, involves the content of the works, copyright and other issues, please contact with the network in 30 days, we will make the appropriate treatment for the first time! The relevant copyright matters please contact: 13515194999
4 other links:
Valve repair, valve repair, valve repair equipment, valve grinding machine, import valve repair, valve repair, valve repair
5, the article source:
|
