Safety return valve: A valve that protects the system from being damaged due to overpressure. Once the pressure in the system piping or device exceeds the set value, the pressure will be released automatically to achieve the purpose of safety protection. Safety valves are automatic valves, mainly for boilers, pressure vessels and pipes, the control pressure does not exceed the specified value, the personal safety and equipment plays an important protective role. Is there any standard safety valve? Safety return valve classification: 1. According to the overall structure and loading mechanism of two. In accordance with the different media discharge method. Three in accordance with the size of the valve opening and the diameter of the flow path. Four. According to the principle of action. Five. Whether the pressure can be adjusted Category 6. According to the working temperature is divided into normal temperature safety valve and high temperature safety valve safety valve selection of the general rules: (l) hot water boiler is generally not closed with a wrench micro-Kai safety valve. (2) steam boiler or steam pipe is generally not closed with a wrench full safety valve. (3) water and other liquid incompressible media commonly used closed micro-valve, or safety relief valve. (4) high-pressure water supply Generally closed full Kai-type safety valve, such as high-pressure water heaters, heat exchangers. (5) compressible gas and other gases generally use closed-type safety valve, such as gas tanks, gas pipelines. (6) E-class steam boilers generally use heavy-duty safety valve. (7) Large-caliber, large displacement and high pressure systems are generally used pulse safety valve, such as temperature and pressure relief devices, power station boilers, etc. (8) transport liquefied gas train tank car tank car tanks and other general Built-in safety valve, shown in Figure 4. (9) The top of the tank with hydraulic safety valve, need to be used in conjunction with the breathing valve. (10) Downhole drainage or natural gas pipeline generally use pilot-operated safety valve, as shown in Figure 6. (11) liquefied petroleum gas station tank pump outlet liquid return pipe commonly used safety valve. (12) Negative pressure or negative pressure may occur during operation of the system is generally used vacuum negative pressure safety valve. (13) Bellows relief valves are generally used for container or piping systems with large back pressure fluctuations and toxic flammability. Safety return valve technical indicators Nominal diameter: DN 4-25? Nominal pressure: PN 25MPa Medium: oxygen, nitrogen, argon, air and other Suitable temperature: -40 ℃ - +80 ℃ Body: Cast steel / stainless steel valve seat : Copper valve top, valve stem: Stainless steel spring: Spring steel A valve that protects the system from being over-stressed due to overpressure, which automatically relieves the pressure once the medium pressure in the system piping or fittings exceeds the set value. The purpose of protection. There are also impulse-type safety valve, pilot-operated safety valve, safety switch valve, safety relief valve, static heavy-duty safety valve. Spring-loaded safety valve depends mainly on the force of the spring to work, spring-loaded safety valve has closed and not closed, the general flammable, explosive or toxic media should be used closed, steam or inert gas can choose not closed Type, in the spring-loaded safety valve with wrench and without wrench. The role of the wrench is to check the valve flap flexibility, and sometimes can also be used as a manual emergency relief pressure, as shown in Figure 3. Lever safety valve rely mainly on the leverage of the hammer work, but because of the large size of the lever safety valve often limits the scope of selection. When the temperature is high, select the safety valve with a radiator. The main parameters of the safety valve is the displacement, the displacement depends on the caliber of the valve seat and the valve opening height, the opening height is different, is divided into two kinds of micro-Kai and full Kai. Micro-Kai refers to the valve opening height of the valve seat throat diameter 1/40 ~ l / 20. Throttle refers to the valve opening height of the valve seat throat diameter 1/4.
Hand Stick Blenders
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Description for Hand Stick Blenders
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Plastic stick or stainless steel optional
Carton box:46*34*37cm 24pcs/ctn
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