| 摘要 |
PURPOSE:To obtain a four-way exchange valve of simple structure having reduced number of parts and high reliability by sliding and exchanging valve sections coupled to a plurality of piston mechanism having difference area for receiving fluid pressure. CONSTITUTION:First, second and third fluid pressure chambers 6, 7, 8 are partitioned through piston mechanisms 2, 3 which are coupled to provide a valve section 4 having a path exchange chamber. Under conducted state, high pressure fluid will flow out through first exchange path 10. Upon closing of a solenoid valve, leakage is produced in a check valve 15 to equalize the pressure in first pressure chamber 6 with that in second pressure chamber 7 where pressurizing force in second pressure chamber 7 will function to small diameter piston side to function a sliding valve 4 thus to exchange high pressure fluid to second exchange path 11 while to exchange low pressure fluid to first exchange path 10. In such a manner the pressure for operating the four-way valve is always the pressurizing force in second pressure chamber 7 to simplify the structure. |
