| 摘要 |
PURPOSE:To minimize the pressure difference before and after valves in order to reduce the pressure loss thereby increasing the efficiency, by detecting the pressure before and after the valves, and electrically operating the valves. CONSTITUTION:The suction valves 3, 4 and the discharge valves 5, 6 are situated at the top of a cylinder 1, and ends of the valves each are secured iron cores that are respectively driven by electromagnets 11, 12, 13, 14. The pressure difference between the inside of the cylinder 1 and the suction side is detected by a pressure difference detector 17, and based on it the electromagnets 11, 12 are operated through a computer 15. Further, the pressure difference between the inside of the cylinder 1 and the discharge side is detected by a pressure difference detector 18, and based on the result the electromagnets 13, 14 are operated through a computer 16. Consequently, the pressure difference before and after the valves can be minimized to reduce the pressure loss at the valves. |
