Pressure shaft seal and method

Details Pressure shaft seal and method Pressure shaft seal and method

1979-02-27

1981-09-15

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277182, F16J 1532

Patent

active

042893216

ABSTRACT:
A shaft seal 10 and method, for use, for example with a rotary drill bit in the oil patch industry, including an annular metal ring 12, an annular elastomeric body 14 and a polytetrafluoroethylene liner 16. The seal 10 has an axially inwardly extending lubricant lip 18 and an axially outwardly extending mud lip 20. When the pressure of the lubricant exceeds a particular value for which the seal is designed (for example, in the range of 100-200 psi), the pressure causes the lubricant lip 18 to reverse direction and allow lubricant to be purged and flow axially outwardly past both lips, until its pressure is reduced after which the lubricant lip 18 returns (flips back) to it original position. During purging, the mud lip 20 acts as a restricted opening controlling purging and excluding drilling mud.

REFERENCES:
patent: 3938813 (1976-02-01), Forch
patent: 4106781 (1978-08-01), Benjamin et al.
patent: 4171561 (1979-10-01), Bainard et al.

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