本章节所罗列的是球阀和蝶阀气动执行机构最常用的基本备选件和附件（对于气动隔膜阀，请参阅下一个章节）。如果所需要的附件、备选件、功能或特殊控制器在本章节中没有列出，则请联系美国斯毕尔公司。为了区别，“备选件”用来表示执行器基本功能的变化所需部件，而“附件”用来表示对执行器增加额外的功能。备选件和附件都根据订单要求由工厂配置在执行机构组件包内。
　　The basic options and accessories listed in this section represent many of the most commonly used for Pneumatic actuation of Ball Valves and Butterfly Valves (see next section for Pneumatic Diaphragm Valves). Contact Spears® for any desired accessories, options, functions, or special control not listed. For differentiation, "Option" is used to identify a basic variation in the actuator while "Accessory" is used to identify an add-on function to the actuator. Both options and accessories are factory configured to order on the actuation package.

可提供的基本备选件和附件概述
Overview of Basic Options & Accessories Available

弹簧复位（故障安全）
（气-到-开启，或气-到-关闭）备选件
Spring Return (Fail Safe)
(Air-to-Open or Air-to-Close) Option

　　可配置在所有高级气动阀门上。执行器内部弹簧可配置成气源供应中断时复位到开启或关闭的位置。弹簧复位可以指定为当希望弹簧复位关闭时气-到-开启（故障关闭）或者希望弹簧复位开启时气-到-关闭（故障开启）。
　　Available for all Premium Pneumatic actuated valves. An internal spring in the actuator is configured to either open or close upon loss of air supply. Spring return can be specified as either Air-to-Open (fail-close) when spring return close is desired or Air-to-Close (fail-open) when spring return open is desired.

气源压力备选件
Operating Pressure Option

　　可配置在高级气动真活接球阀和蝶阀上。标准配置的球阀和蝶阀执行器要求80 psi的气源压力。作为备选件，执行器也可配置成40 psi或60 psi（必须指定）等较低的气源压力。
　　Available for Premium Pneumatic actuated True Union Ball Valves and Butterfly Valves. Standard ball and butterfly valve actuators require an 80 psi supply pressure. With this option, the actuator is configured for lower supply pressures of either 40 psi or 60 psi (must specify).