Quarter turn, double acting and spring return type with a totally enclosed design and no external moving linkages.
四分之一转，双动和弹簧回位类型，具有全封闭结构，没有外部活动连接。
Air or gas cylinder actuators include single or double acting, fail open or closed by mechanical spring or pneumatic force. They can be manufactured to accommodate any length stroke.
空气或燃气缸体执行机构包括单动或双动，由机械弹簧或气动力实现故障开启或关闭等各种类型。
They are available in either double-acting or spring-return configurations.
他们可以以双作用或弹簧返回配置。
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