| 摘要 |
A piston for use with a rotary piston rod or so-called rotary piston can be constructed so as to utilize a solid sleeve-like piston body of a material selected from the group consisting of structural carbon and graphite. This piston body is utilized around an elongated, tubular center member which has openings extending to the interior of the piston body for the purpose of conveying hydraulic fluid so as to lubricate the piston body to facilitate relative rotation of the piston body relative to the sleeve. Appropriate grooves holding elastomeric fluorocarbon sealing rings are located in the piston body and holding structures are provided for holding the piston on the sleeve. The piston is particularly adapted for use in machines for use for cleaning tubes and pipes.
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