| 摘要 |
A non-rotating piston (10) for slidable and longitudinal displacement within a corresponding channel housing (12) defining a housing axis (28) thereof includes a body (20) having a polygonal section formed with a plurality of rectilinear section edges (22) defining corners (24) therebetween. The body (20) defines a piston axis (26) being locally coaxial with the housing axis (28). A seal assembly (30) is mounted on the body (20) to operably interface with an inner wall (32) of the housing (12). The seal assembly (30) includes, along each section edge (22), at least one seal plate (34) being biased radially outwardly towards the housing inner wall (32) in a direction generally perpendicular to the respective section edge (22), and at each corner (24), a seal wedge (38) slidably and sealably connected to respective seal plates (34) of the section edges (22) defining the corner (24). The seal wedge (38) is biased radially outwardly towards a respective inner corner of the housing (12) defined by corresponding housing inner walls (32). |
