| 摘要 |
PURPOSE:To obtain a rotary valve giving a less fluid leak by forming a pressure chamber at the back of a rotary valve rotor, a small diameter part at the side of the rotor in contact with a disc having a passage, and a pressure chamber between said small diameter part and an external casing cylinder. CONSTITUTION:A disc 41 having a passage and a rotor 40 in contact with the side of said disc 41 and able to change over the passage in said disc 41 through turning are provided within a casing cylinder 90. The rotor 40 at the side of the disc 41 is so made as to have a small diameter and the part having the small diameter and the internal wall of the casing cylinder 90 form a pressure chamber 103. Also, another pressure chamber 102 is formed at the opposite side of the disc 41 of the rotor 40 and this rotor 40 is so positioned as to be able to move finely in an axial direction. When the rotor 40 is turned, the pressure chamber 102 is kept at a low pressure level and, when the rotor 40 is fixed, at a high pressure level. Consequently, the pressure chamber 103 is always fed with the same kind of a pressurized fluid as a working fluid, thereby reducing a fluid leak at a rotary valve.
|
