| 摘要 |
An improved valve construction having increased flow/pressure characteristics. The valve comprises a molded valve body including a plurality of body sections each having a generally flat inner surface, and the inner surfaces are disposed in contiguous relation along an interface. Each inner surface is formed with a plurality of recesses that mate with and complement recesses in the inner surface of the other body section to form a valve chamber and a connecting piston chamber. A spool valve is mounted for sliding movement in the valve chamber, while a piston having a generally oval cross section is connected to the spool and is mounted for movement in the oval-shaped piston chamber. The inner surfaces of the body sections are also formed with a plurality of channel portions which mate and complement channel portions in the other body section to form flow channels that communicate with the valve chamber and the piston chamber. By supplying fluid to the piston chamber, the piston will be moved to actuate the valve to control the flow of fluid to an external operating member, such as a fluid cylinder. The valve member, piston and other moving components are sealed to the respective chambers by annular seal assemblies that consist of a rigid back-up ring and a resilient ring that is mechanically locked and bonded to the back-up ring. |
