Utilizemitsubishi(MITSUBISHI) PLC programmable controller centralized controled, with each transmission line configurating of SICK proximity switches, pressureLever device.
Returning the lever to its normal position releases the tension on the rod permitting the valve to maintain normal system pressure.
将手柄恢复到正常位置，则“压杆”上的压力就得到缓解，使得调节阀能够保持正常的系统压力。
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In the late 1940s a company founded by Achille Gaggia produced an espresso-maker that used a lever to force boiling water through the coffee at high pressure.