| 摘要 |
<p>1492539 Pistons POLYPAC BAL Ltd 2 Dec 1974 [29 Dec 1973] 60143/73 Heading F2T In a piston sealing member, having an elastomeric sealing ring 15, the inner and/or outer rims of support rings 16, 17 are of knurled form, to provide leakage grooves (18, Fig. 2, not shown), so as to relieve any fluid pressure which may build up in the space between them. Additional leakage grooves, extending from the base 12 of the groove up its side walls, may be formed in the groove wall itself or in the contacting face of the supporting ring. Nylon bearings rings may be provided.</p> |
