FIELD: sealing rods, plungers and pistons of various machines, plungers of oil well pumps, in particular. SUBSTANCE: seal includes rings fitted on flexible holder and lapped relative to one another; rings are made from antifriction material and pressed in pairs in opposite directions; rings have oval holes. Center of one of radii of oval coincides with axis of flexible holder. Width of hole is lesser than diameter of holder. Seal is provided with calibrated spring-loaded member fitted on side of pressure of medium to be sealed. EFFECT: enhanced tightness and reliability. 2 cl, 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| MECHANICAL SEAL | 2001 |
|
RU2195592C1 |
| MECHANICAL SEAL | 1993 |
|
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|
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|
RU2360166C2 |
