Other positioners may additionally offer controls for nearby valve positioning and gauges to point provide air pressure and control air pressure (for pneumatic controllers – aged controlling strategies). กรณีฉุกเฉิน หรือไฟฟ้าดับ คำนวณค่าแรงบิด ต้องคำนวณจากแรงสปริงขณะปิดลิ้นวาล์ว This will cause the valve to move upward and open up. In the event the valve has opened https://pakoengineering.com/flowmeter-lzs-15-range-100-1000lph/