下列阀门执行机构术语是为了加深理解，避免沟通之间产生误会。术语和概念定义按照相关主体分组并按照字母顺序排列。
　　The following valve actuation terminology is provided for better understanding and elimination of miscommunications. Terms and definitions are grouped by related topics and listed in alphabetical order.

一般系统术语
GENERAL SYSTEM TERMS

　　周围温度 - 指的是环绕执行器周围空气的温度。一般按照适合执行器工作的最高和最低温度进行描述。请注意执行器的周围温度范围可能超过塑料阀门，因此不能被考虑作为工作温度。
　　Ambient Temperature - The temperature of the air surrounding the actuator. Generally stated as a maximum and minimum for proper actuator operation. Note that ambient temperature range for an actuator may exceed that of a plastic valve and should not be considered to be the same as the service temperature.

　　最大管线压力 - 致使阀门不得不关闭的流体介质压力。
　　Maximum Line Pressure - The media pressure against which the valve will have to close.

　　最高工作温度 - 流体介质最高温度。在实际应用中选择适当的热塑性塑料阀门材质时应该考虑工作温度。
　　Maximum Service Temperature - Maximum temperature of the media. Service temperature should be considered in selection of the proper thermoplastic valve material for the application.

　　流体介质 - 流经阀门的物质。
　　Media - The material flowing through a valve.

　　调节 - 通过阀门位于开启到关闭的各种开启位置对流体进行节流和调节。
　　Modulating - Throttling or regulating the flow through a valve by varying the position between open and closed.

　　开启-关闭工作方式 - 基本全开或全闭工作方式，用于开始或停止流体流动。
　　On-Off Service - Basic full open or full closed operation to start or stop flow.

　　操作扭矩 - 操作阀门所需的力，单位为英寸-磅或英尺-磅。
　　Operating Torque - Force required to operate a valve, expressed in inch-pounds or foot-pounds.

　　气源压力 - 操作气动执行器所需的驱动气源压力。
　　Supply Pressure - Facility air pressure supply required to operate pneumatic actuator.

执行器术语
ACTUATOR TERMS

　　双作用 - 采用气源进行开启和关闭阀门的气动执行器。也称为“气-到-气”工作方式。
　　Double Acting - A Pneumatic actuator which uses air to both open and close the valve. Also referred to as "Air-to-Air" operation.

　　电动执行器 - 用来驱动（开启，关闭，或调节）阀门的电气机械装置。需要电机和齿轮传动机构来驱动阀门。采用电动执行器需要考虑各种应用因素。这些包括，工作循环，循环时间，电源电压，工作温度，以及电气设备在各种环境条件下的外壳标准（NEMA）。
　　Electric Actuator - An electromechanical device used to actuate (open, close, or modulate) a valve. An electric motor and gear train is used to actuate the valve. Numerous application considerations must be made in using an electric actuator. These include, duty cycle, cycle time, supply voltage, operating temperature, and enclosure rating (NEMA) for use of electric devices under various environmental conditions.

　　故障关闭 - 当出现气源压力消失时，气动执行器弹簧复位到关闭阀门的位置。也可称为“气-到-弹簧关闭”或“弹簧-到-关闭”工作方式。
　　Fail-Closed - Spring return in a pneumatic actuator which closes the valve upon loss of air pressure. Also referred to as "Air-to Spring Close" or "Spring-to-Close" operation.

　　故障开启 - 当出现气源压力消失时，气动执行器弹簧复位到开启阀门的位置。也可称为“气-到-弹簧开启”或“弹簧-到-开启”工作方式。
　　Fail-Open - Spring return in a pneumatic actuator which opens the valve the upon loss of air pressure. Also referred to as "Air-to-Spring Open" or "Spring-to-Open" operation.

　　气动执行器 - 用来驱动（开启，关闭，或调节）阀门的气源动力机械装置。这种执行器通常采用活塞或隔膜将气源压力转化成机械力。机械力输出可以是旋转力，如球阀的驱动；或线性力，通常用来驱动隔膜阀。气动执行器并不受电动执行器工作循环和循环时间（实际上是即时瞬间的）的限制。但是，可能需要附加一些附件来进一步控制操作速度，而且可能需要某种电信号装置的电压供应。
　　Pneumatic Actuator - An air operated mechanical device used to actuate (open, close, or modulate) a valve. The actuator converts air pressure into mechanical force most commonly using either a piston or diaphragm. The mechanical force output can be either rotational, as in actuation of a ball valve, or linear as commonly used in actuation of a diaphragm valve. Pneumatic actuators are not significantly limited by duty cycles and cycle time (virtually instantaneous) found with electric actuators. However, they may require additional accessories to further control speed of operation and a voltage supply for certain electric signal devices which may be desired.

　　弹簧复位 - 当动力消失时，执行器采用弹簧将阀门恢复到开启或关闭的位置。弹簧复位通常用在气动执行器上，但是如果设计需要或出现系统故障有必要将阀门开启或关闭时，则在电动执行器上也可采用弹簧复位装置（请参阅故障关闭和故障开启术语）。
　　Spring Return - An actuator using a spring to return the valve to either an open or closed position upon loss of power. Spring returns are most commonly used with pneumatic actuators, but can be used on electric actuators where it is neccessary for the valve to open or close by design or by system failure (see also Fail-Close and Fail-Open terms).