Mechanical seal with high pressure high temperature secondary seal
A secondary seal of a mechanical seal comprises an annular sealing gasket and backing plate surrounding a cylindrical sealing surface, all of which can be made of the same metallic material. The gasket is C-shaped in cross section, and is axially pressed during operation into a C-shaped groove formed in the backing plate, the groove being shallower and larger in inner diameter than the gasket, so that the gasket, when pressed into the groove, deforms radially inward and seals against both the backing plate and the sealing surface. The contact area between the gasket and sealing surface increases with pressure. In embodiments, when the pressure is released, the gasket retracts from the sealing surface, allowing easy disassembly and allowing axial movement of the gasket and backing plate. Highly polished surfaces of the gasket and sealing surface can allow axial motion thereof during operation to maintain the seal face gap.
- Research Organization:
- Flowserve Management Company, Irving, TX (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- CRADA 1872.00.00
- Assignee:
- Flowserve Management Company (Irving, TX)
- Patent Number(s):
- 10,557,554
- Application Number:
- 16/008,214
- OSTI ID:
- 1632543
- Resource Relation:
- Patent File Date: 06/14/2018
- Country of Publication:
- United States
- Language:
- English
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