Safety valve is a kind of the static pressure on import automatic pressure protection device, it is one of the most important safety accessories for pressure vessel, its function is: when the container pressure exceeds a certain value, depending on the medium itself pressure automatically open the valve, quick discharge amount of medium. When the pressure inside the container to the allowable values, valve automatically shut down again, the container pressure allows was always lower than the upper limit, automatically to prevent possible accidents due to overpressure, so the relief valve is also known as the final protection device of pressure vessel. Working principle of the work according to the pressure relief valve can automatically opening and closing, general installation in a closed system of the equipment or piping safety protection system. Relief valve belong to automatic valve class, mainly for the boiler, pressure vessel and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role. Safety valve is a safety valve, the opening and closing pieces under the action of external force in a normally closed state, when the equipment or piping within the medium pressure, e. automatically when open, more than by discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed value. When the equipment or pipeline internal pressure than specified value, automatically open pressure, ensure that the equipment and piping within the medium pressure within the specified value, prevent the accident. automatically open, the medium releasing, decompression; When the pressure back to normal, spring pressure to the valve seat and valve core, valve automatically shut down. Safety valve's role is to prevent the pipeline or equipment of medium pressure in excess of the prescribed value, so as to achieve the goal of security and protection. Type 1. Heavy hammer lever type relief valve hammer lever type relief valve is to use a heavy hammer and leveraged to balance the force acting on the disc. According to the principle of leverage, it can use the heavy hammer through leverage with the increase of quality of the smaller force become larger, and by moving the position of the heavy hammer ( Or transform the quality of the heavy hammer) To adjust the relief valve opening pressure. Heavy hammer lever type safety valve structure is simple, easy adjustment and more accurate, and the load will not have larger by the rise of the disc, is suitable for high temperature occasion, used more widely, especially in the boiler temperature and high pressure vessel. But is bulky, heavy hammer lever type safety valve structure vibration loading mechanism easily, and often the leakage due to vibration; The back pressure is low, is not easy to shut down and keep tight after opening. 2. Micro spring raise safety valve spring and safety valve is to use the compression spring force to balance the forces acting on the disc. Spiral cast the amount of compression spring can turn the adjusting nut to adjust it, using this structure can according to need correction of the relief valve opens, Setting) Pressure. Spring raise safety valve structure of portable compact and has a high sensitivity, installation position is not restricted, and because of the sensitivity of the vibration is small, so can be used for the transportable pressure vessel. The relief valve fault is added by the load will change as the valve opens and, namely with the increase of the disc, spring compression ratio increases, the force acting on disc starts to increase. This is unfavorable for relief valve rapid opening. In addition, the spring on the valve will be because of the effect of long-term exposure to high temperature and reduce tension. Used in the container of high temperature, often want to consider the heat insulation or heat dissipation problem of spring, so that the structure is complicated. 3. Pulse valve pulse valve consists of the main valve and auxiliary valve, through the role of the pulse and auxiliary valve to drive the main valve action, its structure is complex, usually only applies to large volumes of boiler and pressure vessel safety. 4. Spring loaded safety valve spring safety valve in accordance with the medium to the different way of discharge, and can be divided into totally enclosed and semi-enclosed and open three. 1. Closed valve fully closed valve exhaust, all through the exhaust gas emission, medium can't between external leakage, it is mainly used for medium for toxic gas containers. 2. Semi-closed part relief valve semi-enclosed gas discharge by the relief valve through the exhaust pipe, there is also a part of from the bonnet and the clearance between the Industrial Valves stem leakage, gases used for medium to not pollute the environment more containers. 3. Open the relief valve open the relief valve cover is open, make the spring chamber and atmosphere are interlinked, it is beneficial to lower the temperature of the spring, mainly is suitable for the medium for steam, and the atmosphere of high temperature gas containers that don't pollute. 1 installation and maintenance, the relief valve should be installed vertically in the pot, the top of the header. Between the relief valve and the drum or header, shall not be equipped with access steam outlet pipe and valve. 2, lever type relief Industrial Valves to prevent heavy hammer to mobile devices and on its own limitation lever deviant guide frame, the spring safety valve to have raise a hand and prevent twisted casually adjusting screw of the device. 3, for the rated steam pressure is less than or equal to 3. 82 mpa boiler safety valve throat diameter should not less than 25 mm; For the rated steam pressure is greater than 3. 82 mpa boiler safety valve throat diameter should not less than 20 mm. 4, the relief valve and connecting pipe of boiler, its cross-sectional area should not be less than import cross-sectional area of the relief valve. If several common relief valve installed in a short tube attached directly to the drum, the access of the short tube cross-sectional area should not step in all safety valve exhaust steam area 1. 25 times. 5, the relief valve should be installed commonly exhaust tube, exhaust steam pipe should be direct safety, and have enough area, ensure the exhaust steam flow. At the bottom of the relief valve exhaust pipe should be put on AIRS have received safety drain pipe, on the exhaust pipe and drain pipe, are not allowed to furnish the valve.
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