Seal

A shaft seal for reducing leakage between a high pressure side and a low pressure side, the seal comprising:

• a lip at a low pressure end of the shaft seal;
• a tapered cylindrical body extending from the lip, the tapered cylindrical body having a first diameter where the tapered cylindrical body meets the lip and the tapered cylindrical body having a second diameter at a distal end, the distal end exposed to a high pressure fluid;
• an aperture the aperture formed along an axis of the lip and an axis of the tapered cylindrical body, the aperture has a first end at the lip and the aperture having a distal second end, the aperture has a first inner diameter slightly greater than an outer diameter of the shaft at the first end and the aperture tapering to a second inner diameter at the distal end of the aperture, the second inner diameter being approximately the diameter of the shaft;
• and
• an o-ring, the o-ring is mounted around the tapered cylindrical body such that a resilient force of the o-ring applies pressure on the tapered cylindrical body against the shaft and as pressure of the high pressure fluid is exerted against the o-ring, the o-ring exerts additional pressure on the tapered cylindrical body against the shaft.