Safety valve structure in many forms, the basic structure of the classification is as follows: First, the safety valve according to its overall structure and the loading mechanism can be divided into heavy hammer lever, spring and pulse three. 1, Hammer lever safety valve Hammer lever safety valve is the use of weights and levers to balance the role of the force on the valve. According to the principle of leverage, it can use the weight of the smaller hammer by increasing the lever to obtain greater force, and by moving the weight of the position (or change the mass of the hammer) to adjust the relief valve opening pressure. Hammer lever safety valve structure is simple, easy to adjust and more accurate, the added load will not increase due to the valve has a greater increase, suitable for high temperature applications, used to be more common in the past, especially Is used in boilers and high temperature pressure vessels. However, heavy hammer leveraged safety valve structure is relatively bulky, loading mechanism is easy to vibration, and often due to vibration and leakage; its back seat pressure is low, not easy to close after opening and maintain tight. 2, spring-loaded safety valve Spring-loaded safety valve is the use of compression spring force to balance the role of the valve flap force. The amount of compression of the helical coil spring can be adjusted by turning the adjusting nut above it, with which it is possible to correct the opening (setting) pressure of the safety valve as required. The spring-loaded safety valve is lightweight and compact, with high sensitivity and unlimited mounting position. It is also suitable for mobile pressure vessels because of its low sensitivity to vibration. The disadvantage of this type of safety valve is that the applied load changes with the opening of the valve. As the valve flap rises, the amount of compression of the spring increases and the force acting on the valve flap also increases. This is a detriment to the quick opening of the safety valve. In addition, the spring on the valve will reduce the spring force due to the long-term high temperature. When used on a container with a high temperature, the structure is complicated by the fact that the problem of heat insulation or heat dissipation of the spring is often taken into consideration. 3, pulse safety valve Pulse safety valve by the main valve and auxiliary valve composition, through the auxiliary valve pulse driven main valve action, its complex structure, usually only applies to a large amount of safe discharge boiler and pressure vessels. Among the above three types of safety valves, spring-loaded safety valves are commonly used. Second, in accordance with the different media discharge, safety valve can be divided into fully enclosed, semi-closed and open three. 1, fully enclosed safety valve Fully enclosed safety valve exhaust, all the exhaust gas through the exhaust pipe, the media can not leak outside, mainly for the media is toxic. Flammable gas containers. 2, semi-enclosed safety valve Semi-enclosed safety valve part of the gas discharged through the exhaust pipe, there are some leakage from the gap between the valve cover and stem, and more for the medium is not polluting the environment of gas containers. 3, open the safety valve Open the safety valve cover is open, so that the spring chamber with the atmosphere, which will help reduce the temperature of the spring, mainly for the medium for steam, as well as the atmosphere does not produce pollution of the hot gas container. Third, in accordance with the valve opening of the maximum height and the diameter of the safety valve flow channel to divide, and can be divided into micro-Kai-type safety valve and the whole Kai-type safety valve two. 1, Micro-Kai safety valve Micro-Kai safety valve opening height is less than 1/4 of the diameter of the runner, usually the flow diameter 1/40 a 1/20. Micro-Kai-type safety valve action is proportional action type, mainly for liquid applications, and sometimes also for small emissions gas occasions. 2, All-in-safety valve All-in-one safety valve opening height greater than or equal to the diameter of the channel 1/4. The full relief valve discharge area is the smallest cross-sectional area of ​​the valve seat throat. The action process belongs to two sections of action type, must be resorted to a lift mechanism to achieve full open, all-purpose safety valve is mainly used for gas media occasions. 3, Kai-type safety valve opening height between the micro-Kai and Kai-type between. That can be made into two sections, can also be made into a proportional action. Fourth, according to the principle of action can be divided into direct-acting safety valve and non-direct-acting safety valve. 1, direct-acting safety valve Direct-acting safety valve is opened in the direct role of the working medium, that is, rely on the role of the working medium pressure to overcome the loading mechanism added to the valve disc mechanical load, the valve open. This safety valve has the advantages of simple structure, quick action and good reliability. But because of relying on the structure of the load, the load size is limited, can not be used for high pressure, large diameter of the occasion. 2, non-direct acting safety valve This type of safety valve can be divided into pilot-operated safety valve, safety valve with power-assisted device. Pilot-operated safety valves are driven or controlled by the medium exiting the pilot valve. The pilot valve itself is a direct-acting safety valve, and sometimes other forms of valves. Pilot-type safety valve for high pressure, large diameter of the occasion. The main valve of the pilot-operated safety valve can also be designed to seal against the working medium or to apply a much greater mechanical load to the valve disc than the direct-acting safety valve, thus providing a good seal. At the same time, its movements are rarely affected by back pressure. The disadvantage of this type of safety valve is that its reliability is related to the main valve and the pilot valve. The operation is not as fast, reliable and complex as the direct acting safety valve. The safety valve with power-assisted device is forced by a power-assisted device to force the safety valve to open below normal cracking pressure. This safety valve is suitable for opening pressure is very close to the working pressure of the occasion, or the need to regularly open the safety valve for inspection or blowing off the adhesive, frozen media occasions. At the same time, a means of forcibly opening the safety valve in an emergency situation is also provided. Fifth, whether the pressure can adjust the classification can be divided into fixed and non-adjustable safety valve and adjustable safety valve 1. Fixed not adjustable safety valve pressure value has been set by the factory, can not be changed when used, commonly used in central air conditioning, air conditioning, boiler wall hanging Furnace, solar and other systems, such as the S10 series safety valve. 2. Adjustable safety valve take-off pressure with the user's different needs in a certain range can be arbitrarily set, commonly used in the system to protect the pressure to be changed frequently occasions, such as the S10 series safety valve, but the price is generally higher. Six, according to the working temperature is divided into room temperature safety valve and high temperature safety valve 1. Normal temperature safety valve is generally only installed in HVAC, air-conditioning or water system temperature 110 ℃ safety valve, such as the S10 series safety valve. 2. High-temperature safety valve is specifically used in solar systems and mold temperature system temperature 180 ℃ safety valve, such as S10 series safety valve.
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