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原文
Safe return valve Safe return valve in the system from a security role. When the system pressure exceeds the set value, the safety valve Ting open, part of the system in the gas into the atmosphere, the system pressure does not exceed the allowable value, thus ensuring the system is not an accident due to excessive pressure. Safety valve, also known as relief. Icon for the safety valve of several typical structure. For the piston valve, a valve plate. Air pressure in the piston A, when the pressure exceeds the spring force to determine the safety value, the piston A is the top open, part of the compressed air that is discharged into the atmosphere from the valve port; when air pressure falls below the safety value, spring-driven piston down, close the valve port. A protection system is damaged due to high pressure valve, pipe or device once the system pressure exceeds the set value of the medium, it will automatically release the pressure, so as to achieve security objectives. In addition to impulse-type safety valve, pilot safety valve, safety valve switching, security, decompression valve, dead weight safety valve and so on. Spring-loaded safety valve spring force and rely mainly on the work, there are spring-loaded safety valve in the closed and not closed, generally flammable, explosive or toxic media should be used in closed, steam or inert gas can be used not closed type, in the spring-loaded safety valve with a wrench in there and without wrench. The main function is to check wrench valve degree of flexibility sometimes can also be used with manual emergency relief, as shown in Figure 3. Lever-type safety valve lever hammer mainly rely on the force and work, but because of the huge lever safety valve size selection is often limited scope. When used with a high temperature radiator valve. The main parameters of safe return valve is the displacement, the displacement depends on the caliber of the valve seat and valve opening height, the opening height, divided into low lift-and full-Kai-two. Enlight-type is the height of the valve seat to open throat diameter of 1 / 40 ~ l/20. Full-Kai-is the height of the valve seat to open throat diameter of 1 / 4.
原文来自：http://www.anquanfa.org

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译文：

译文：
安全回流阀在系统中起安全保护作用。当系统压力超过规定值时，安全阀汀开，将系统中的一部分气体排入大气，使系统压力不超过允许值，从而保证系统不因压力过高而发生事故。安全阀又称溢流阀。图示为安全阀的几种典型结构形式。为活塞式安全阀，阀芯是一平板。气源压力作用在活塞A上，当压力超过由弹簧力确定的安全值时，活塞A被顶开，一部分压缩空气即从阀口排入大气；当气源压力低于安全值时，弹簧驱动活塞下移，关闭阀口。一种保护系统因压力过高而被破坏的阀门，一旦系统管路或装置中的介质压力超过设定值，会自动释放压力，从而达到安全保护的目的。另外还有冲量式安全阀、先导式安全阀、安全切换阀、安全解压阀、静重式安全阀等。弹簧式安全阀主要依靠弹簧的作用力而工作，弹簧式安全阀中又有封闭和不封闭的，一般易燃、易爆或有毒的介质应选用封闭式，蒸汽或惰性气体等可以选用不封闭式，在弹簧式安全阀中还有带扳手和不带扳手的。扳手的作用主要是检查阀瓣的灵活程度，有时也可以用作手动紧急泄压用，如图3。杠杆式安全阀主要依靠杠杆重锤的作用力而工作，但由于杠杆式安全阀体积庞大往往限制了选用范围。温度较高时选用带散热器的安全阀。　　安全回流阀的主要参数是排量，这个排量决定于阀座的口径和阀瓣的开启高度，由开启高度不同，又分为微启式和全启式两种。微启式是指阀瓣的开启高度为阀座喉径的1／40～l／20。全启式是指阀瓣的开启高度为阀座喉径的1／4。

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