John Crane Inc.

Darin Merrill Rasmussen

James R Wasser

Syed Niamathullah

Michael G Kalodimos

Tom Steigerwald

Dan Kozlowski

Mike G Kalodimos

A non-collapsible flexible sealing membrane (or bellows) for incorporation in a mechanical seal assembly and use in rotary shaft equipment. The sealing membrane includes a substantially radially outward extending first flange portion, which can be urged into an axially shiftable ring by a biasing mechanism. The sealing membrane further includes a substantially axially outboard extending second coaxial portion, substantially radially inward of the balance diameter of the seal. The horizontal portion is advantageously held fixed to a stub sleeve by an annular band. The angle between the vertical portion and the horizontal portion of sealing membrane enables directional control of the forces acting on stub sleeve and primary ring.

Non-collapsible flexible sealing membrane and seal assembly for rotary shaft equipment

A mechanical seal assembly adapted for arrangement around a rotating shaft of a rotating device and has first and a second seal rings. The assembly also includes an annular carrier having a base and a removable end portion configured to be affixed to a housing of the rotating device. The assembly also includes an annular flexible sealing membrane. The membrane includes an outer portion arrangeable between the first seal ring and a biasing mechanism and that is axially shiftable relative to the rotating shaft. The membrane also includes an inner portion surrounded by the outer portion and positioned between the base and the removable end portion of the annular carrier and the base and a removable end portions hold the inner portion in fixed relative to the annular carrier as the outer portion shifts relative to the rotating shaft.

Flexible sealing membrane and seal assembly for rotary shaft equipment

A double seal includes two sliding seals. The seals can be non-pusher secondary seals (NPSS). In one embodiment, by employing an NPSS as the chamber side seal can handle large pressure reversals where the inner diameter pressure (pressure in the chamber) spikes and exceeds the outer diameter pressure that is provided between the two seals forming the double seal.

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Palatine, IL, United States of America

Darin Merrill Rasmussen