Europe's largest high-speed rail operator has predicted that domestic air travel in the UK will lose millions of passengers to a 250mph train service if an ultra-fast network becomes a reality.
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。
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.