SEALING DEVICE

• US 3,827,700 A
• Filed: 09/29/1972
• Issued: 08/06/1974
• Est. Priority Date: 10/01/1971
• Status: Expired due to Term

• Current Assignee: Sigurd Kaller
• Original Assignee: Sigurd Kaller
• Inventors: Kaller, Sigurd
• Primary Examiner(s): Prince, Louis R.
• Assistant Examiner(s): Smith, Robert I.
• Application Number:
  US05/293,718
• Time in Patent Office: 676 Days
• Field of Search: 277/58,59,60,75,73
• US Class Current: 277/529
• CPC Class Codes: F16J 15/56 Other sealings for reciprocating rods
• CPC Class Codes: F16J 9/28 of non-metals
• CPC Class Codes: Y10S 277/904 Viscous seal

Abstract

A sealing arrangement for a high pressure gas cylinder closed at one end by a slideable piston. An annular space between the piston and cylinder carries opposing sealing members with facing sealing lips. Oil in the cavity between the sealing members is kept under pressure by the expansive force of the gas in the cylinder. The oil pressure is always maintained higher than the gas pressure by either a spring urging the sealing members together, or a stepped construction whereby the reactive area of the cavity is less than the active area between the piston and cylinder.

Claims

1. Sealing device for preventing leakage of high-pressure gas between two relatively movable elements comprising at least two spaced and facing sealing members defining together with the movable elements a space for a non-gaseous medium, characterized in that a first sealing member contiguous to the high-pressure gas is displaceable under the action of the high-pressure gas towards a second sealing member contiguous to the low-pressure side and in that means coacting with the displaceable sealing member are adapted to impart to the medium confined in said space a resulting pressure higher than the pressure of the highpressure gas.

2. Sealing device according to claim 1, characterized in that the means coacting with the displaceable sealing member are constituted by spring means acting on the side of the sealing member facing away from the space.

3. Sealing device according to claim 1, characterized in that said means coacting with the displaceable sealing member are constituted by a sleeve member surrounding both sealing members and adapted to be moved together with the displaceable sealing member and during the displacement of the latter sealingly slide on the second sealing member and to form an extension of that surface of the displaceable sealing member, which faces the high-pressure gas.

4. Sealing device according to claim 3, characterized in that the sleeve member includes a rear annular guide member.