译文：
强度性能 阀门的强度性能是指阀门承受介质压力的能力。阀门是承受内压的机械产品，因而必须具有足够的强度和刚度，以保证长期使用而不发生破裂或产生变形。 密封性能 阀门的密封性能是指阀门各密封部位阻止介质泄漏的能力，它是阀门最重要的技术性能指标。阀门的密封部位有三处：启闭件与阀座两密封面间的接触处;填料与阀杆和填料函的配和处;阀体与阀盖的连接处。其中前一处的泄漏叫做内漏，也就是通常所说的关不严，它将影响阀门截断介质的能力。对于截断阀类来说，内漏是不允许的。后两处的泄漏叫做外漏，即介质从阀内泄漏到阀外。外漏会造成物料损失，污染环境，严重时还会造成事故。对于易燃易爆、有毒或有放射的介质，外漏更是不能允许的，因而阀门必须具有可靠的密封性能。 流动介质 介质流过阀门后会产生压力损失(既阀门前后的压力差)，也就是阀门对介质的流动有一定的阻力，介质为克服阀门的阻力就要消耗一定的能量。从节约能源上考虑，设计和制造阀门时，要尽可能降低阀门对流动介质的阻力。 启闭力和启闭力矩 启闭力和启闭力矩是指阀门开启或关闭所必须施加的作用力或力矩。关闭阀门时，需要使启闭件与发座两密封面间形成一定的密封比压，同时还要克服阀杆与填料之间、阀杆与螺母的螺纹之间、阀杆端部支承处及其他磨擦部位的摩擦力，因而必须施加一定的关闭力和关闭力矩，阀门在启闭过程中，所需要的启闭力和启闭力矩是变化的，其{zd0}值是在关闭的最终瞬时或开启的最初瞬时。设计和制造阀门时应力求降低其关闭力和关闭力矩。 启闭速度 启闭速度是用阀门完成一次开启或关闭动作所需的时间来表示。一般对阀门的启闭速度无严格要求，但有些工况对启闭速度有特殊要求，如有的要求迅速开启或关闭，以防发生事故，有的要求缓慢关闭，以防产生水击等，这在选用阀门类型时应加以考虑。 动作灵敏度和可靠性 这是指阀门对于介质参数变化，做出相应反应的敏感程度。对于节流阀、减压阀、调节阀等用来调节介质参数的阀门以及安全阀、疏水阀等具有特定功能的阀门来说，其功能灵敏度与可靠性是十分重要的技术性能指标。 使用寿命 它表示阀门的耐用程度，是阀门的重要性能指标，并具有很大的经济意义。通常以能保证密封要求的启闭次数来表示，也可以用使用时间来表示。

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原文：
Strength properties Strength properties of the valve is the valve to withstand medium pressure capacity. Withstand the internal pressure valve is a mechanical product, and therefore must have sufficient strength and rigidity to ensure the long-term use without breakage or deformation. Sealing Valve valve sealing performance is part of the sealing ability to prevent media leaks, it is the valve of the most important technical performance indicators. Valve sealing parts are three: open and close the two pieces with the valve seat sealing surface contacts between the Office; filler stem and the stuffing of the distribution and the Branch; body junctions with the valve cover. Of which the first one is called the leakage of internal leakage, which is commonly known as Guan lax, it will affect the media's ability to cut off the valve. For the cut valve, the internal leakage is not allowed. Leakage after the two called the leakage, that is, medium leaking into the valve from the valve outside. Leakage would cause material loss, environmental pollution can also cause serious accidents. For flammable and explosive, toxic or radioactive medium, leakage is inadmissible and, therefore, the valve must have a reliable sealing performance. Mobile Media Medium flows through the valve would cause pressure loss (both before and after the valve pressure difference), that is, the flow valve on the media have a certain resistance, medium to overcome the resistance of the valve is necessary to consume a certain energy. From the conservation of energy considerations, the design and manufacture of valves, it is necessary to minimize the resistance of the valve on the flow medium. Headstock headstock force and torque Hoisting force and hoisting moment is to open or close the valve that must be imposed by force or torque. Close the valve, the need to open and close with the Coma Berenices two pieces of the sealing surface of the seal formed between certain specific pressure, while also overcoming the stem and the packing between the stem and the nut thread between the stem end bearing at and other friction parts of the friction, and therefore must apply the closing force and closing a certain moment, the valve in the open and close the process, the required hoisting hoisting force and moment of change, and its maximum is close to the final instant or open the initial transient. The design and manufacture of valves should be sought to reduce the closing force and closing moments. Hoisting Speed Hoisting speed is used to open or close the valve to complete a movement to represent the time required. Valves open and close speeds generally no strict requirements, but some conditions the speed of the hoist have special requirements, if any, the prompt to open or closed, to prevent an accident, and some require slow and shut down to prevent the resulting water hammer, etc. , which should be considered in selection of valve type. Action sensitivity and reliability of This refers to the valve for the medium parameters change, the sensitivity of the response accordingly. For the throttle valve, reducing valve, regulating valve used to adjust the medium parameters of the valves, as well as safety valves, steam trap with a specific function such as valves, its function is very important to the sensitivity and reliability of the technical performance indicators. Life It is said that the durability of the valve is a valve key performance indicators, and has great economic significance. Usually able to ensure that the number of seals required to open and close that can also be used to indicate the use of time.