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What is the safety valve hydraulic

At present mass production of a spring-loaded safety valve and leveraged two categories. Another impulse of safety valve, the pilot of safety valve, safety valve switch, to extract the safety valve, such as static re-safety valve. Spring-loaded safety valve spring rely mainly on the work force, spring-loaded safety valve in the closed and has not closed, the general flammable, explosive or toxic media should use closed, steam or inert gas, can be selected is not closed Type in the spring-loaded safety valve in there with wrenches and without the wrench. Wrench main role is to check the valve degree of flexibility, and sometimes also used as an emergency pressure relief manual used in Figure 3. Lever-type safety valve on the main levers and weights of the work force, but because lever-type safety valve size often limit the scope of choice. Higher temperatures when the radiator with optional safety valve.

Is the safety valve of the main parameters of displacement, the decision to emissions in the calibre of the valve seat and open the valve of a high degree, by opening a high degree of different, is divided into Weiqi-and-two full-Kai. Weiqi-valve is the opening height of the valve seat jets Drive 1 / 40 ~ l/20. All Kai-valve is the opening height of the valve seat jets Drive 1 / 4.

2. Selection of safety valve

Pressure relief valve operated by the decision of the Nominal pressure, temperature decision by the use of safety valve temperature range, calculated by the constant pressure of the safety valve spring or decision of the constant pressure of the lever, then use the media in accordance with the material and determine safety valve Structure, in accordance with safety valve to vent放量calculate the safety valve of the jets Drive. Following is the safety valve of the general rules of selection.

(L) hot water boiler in general does not bring closure wrench Weiqi-safety valve.
(2) steam boiler or steam pipe generally does not bring the closure of Kai-wrench the whole safety valve.
(3), such as liquid water can not be compressed using Media General closed Weiqi-safety valve, or safety relief valve.
(4) high-pressure water with the general closure of the whole Kai-safety valve, such as high-pressure water heaters, heat exchangers, and so on.
(5), such as gas compressibility Media General closed by the whole Kai-safety valve, such as cylinders, gas pipelines and so on.
(6) E-class steam boiler with static re-general safety valve.
(7) large-diameter, large displacement and high pressure systems generally use pulse safety valve, such as by temperature decompression devices, such as utility boilers, as shown in Figure 8.
(8) tankers transporting LNG train, car tankers, tank general with the contents of safety valve, shown in Figure 4.
(9) at the top of the general use of hydraulic oil tank safety valve, to be used in conjunction with breathing valve.
(10) underground drainage or natural gas pipelines and general-use pilot safety valve, as shown in Figure 6.
(11) liquefied petroleum gas stations can pump the liquid return to the export pipeline on the general to return with safety valve.
(12) or negative pressure in the course of operation could have negative pressure systems generally use vacuum safety valve.
(13) back-pressure volatile and toxic or flammable containers pipeline system generally used bellows safety valve.

Principle and structure:
Safety valve in the system from the security protection. When the pressure exceeds the value, the safety valve opened Ting, a part of the system of gas into the atmosphere, allowing the system to allow the pressure of not more than the value, thus ensuring system is not due to excessive pressure on the incident. Also known as the safety valve relief valve. Picture shows the safety valve for several typical structure. Plans for a safety valve piston, valve core is a plate. Gas source in Detroit A pressure on, when the pressure more than determined by the spring of the security value, the Pistons were Top A, part of compressed air from a valve port into the atmosphere when the gas pressure below the safety value, the spring-driven Pistons down, close the valve port.

Fig b and c, respectively ball valve and diaphragm-type safety valve, working principle is identical with the piston. This spring the three are to provide safety valve control, regulation of spring preload, you can change the security value of size, the straight-called safety valve.

Figure d-safety valve for the pilot to provide small straight valve control pressure on the diaphragm, the patch is the spool on the hard-core, the pressure on the valve seat. A source of pressure when the gas pressure is greater than security, open the valve core, the compressed air output from the left into the hole atmosphere. Diaphragm pilot safety valve and pressure-relief valve of a better, action sensitive, but the biggest opening force is relatively small, poor flow characteristics. Practical applications, the choice should be based on actual needs of the type of safety valve, and in accordance with the largest displacement to choose their path.

Safety valve in the system from the security protection. When the pressure exceeds the value, the safety valve opened Ting, a part of the system of gas into the atmosphere, allowing the system to allow the pressure of not more than the value, thus ensuring system is not due to excessive pressure on the incident. Also known as the safety valve relief valve. Picture shows the safety valve for several typical structure. Plans for a safety valve piston, valve core is a plate. Gas source in Detroit A pressure on, when the pressure more than determined by the spring of the security value, the Pistons were Top A, part of compressed air from a valve port into the atmosphere when the gas pressure below the safety value, the spring-driven Pistons down, close the valve port.

Figure b and c, respectively ball valve and diaphragm-type safety valve, working principle is identical with the piston. This spring the three are to provide safety valve control, regulation of spring preload, you can change the security value of size, the straight-called safety valve.

Figure d-safety valve for the pilot to provide small straight valve control pressure on the diaphragm, the patch is the spool on the hard-core, the pressure on the valve seat. A source of pressure when the gas pressure is greater than security, open the valve core, the compressed air output from the left into the hole atmosphere. Diaphragm pilot safety valve and pressure-relief valve of a better, action sensitive, but the biggest opening force is relatively small, poor flow characteristics. Practical applications, the choice should be based on actual needs of the type of safety valve, and in accordance with the largest displacement to choose their path.