Air Operated - Uses auxiliary compressed air or water source to shift valve, rather than a solenoid operator.
气动—使用辅助压缩空气或水的来源转变阀，而不是一个螺线管操作。
2
Safety relief valve is used to protect the machine and operator shall not be adjusted.
溢流阀是用来保护机器和操作人员的安全的，不得任意调整。
3
Air Operated - Uses auxiliary compressed air or water pressure to shift valve, rather than a solenoid operator. ASCO offers a choice of 3 pneumatic operator pressure ratings.