1. Categories
At present there are mass-produced spring-loaded safety valve and the rod two broad categories. There are also impulse-type safety valve, pilot-type safety valve, safety valve switching, security, decompression valve, safety valve and other static weight. Spring-type safety valve which rely mainly on the work of the spring force, spring-loaded safety valve in the closed and there are not closed, generally flammable, explosive or toxic media should be used enclosed, steam or inert gas, etc., may choose not closing type, in the spring-loaded safety valve with a wrench in there and without wrench. Main function is to examine the wrench valve flap degree of flexibility, and sometimes can also be used as a manual for emergency pressure relief use, shown in Figure 3. Lever-type safety valve mainly rely on the force lever heavy hammer to work, but because of lever-type safety valve is often bulky and limit the scope of choice. Use at high temperature safety valve with a radiator.
The main parameter is the safety valve displacement, the displacement determined by the caliber of the valve seat and valve flap opening height, from the opening a high degree of difference Enlight is divided into two kinds of style and all-Kai style. Enlight-type refers to the height of the opening flap valve seat jets Trail 1 / 40 ~ l/20. All Kai-type refers to the height of the opening flap valve seat throat diameter of 1 / 4.
2. Selection of safety valve
The decision by the operating pressure of the nominal pressure safety valve, relief valve by the operating temperature determine the operating temperature range, from the calculated values of the decision constant pressure relief valve spring or a lever set pressure range, and then decide according to the use of media material and the safety valve structural type, and then calculated under the safety valve safety valve to vent the hose heavy volume diameter. The following general rules of safety valve of choice. (1) hot water boiler tends to be used is not closed with a wrench Enlight safety valve. (2) The steam boiler or steam pipe is not closed to general use type safety valve with a wrench Kai-wide. (3), water and other liquids in a closed incompressible media in general Enlight-type safety valve, or safety relief valve. (4) High-pressure water in general with the closure of full-Kai-type safety valve, such as the high-pressure feedwater heater, heat exchanger, etc.. (5) The gas compressibility medium usually in a closed full-Kai-type safety valve, such as the gas tank, gas pipelines and so on. (6) E-class steam boiler safety valve generally static weight. (7) large-diameter, large displacement and high pressure systems are generally used pulsed valve, such as temperature and pressure reduction devices, power station boilers and so on, as shown in Figure 8. (8) train transporting liquefied gas tankers, car tankers, storage tanks and other general use built-in safety valve, as shown in Figure 4. (9) oil tank at the top of a general hydraulic safety valve, be used in conjunction with the breathing valve. (10) Underground drainage or natural gas pipelines in general with the pilot-type safety valve, as shown in Figure 6. (11) Liquefied petroleum gas station tank liquid pump outlet pipe tends to be used to return safe return valve. (12) or negative pressure during operation may produce negative pressure systems are typically used vacuum relief valve. (13) back-pressure volatile and toxic flammable container or piping systems are generally used bellows valve. (14) medium low freezing point of the system generally used in thermal insulation jacket safety valve, as shown in Figure 7. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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