Pressure Balanced Bellows Valve Seal, Pressure Seal TestEPA Contract Number: 68D40045
Title: Pressure Balanced Bellows Valve Seal, Pressure Seal Test
Investigators: Larsen, Richard R.
Small Business: Flexial Corporation
EPA Contact: Manager, SBIR Program
Project Period: September 1, 1994 through March 1, 1995
Project Amount: $36,936
RFA: Small Business Innovation Research (SBIR) - Phase I (1994) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)
Description:New bellows seal technology to greatly reduce cost and improve seal integrity and life of zero-emission seals in rising stem valves. Bellows seals, considered zero-emission devices by the EPA, are urgently needed in larger-size valves -- 3 inches and up -- to meet pending fugitive emission requirements on a much more stringent scale. But their sensitivity to pressure makes them unpredictable in application, and their heavy-wall structure as pressure barriers makes them large, expensive and impractical in all but the most hazardous of applications. This invention pressure balances the bellows to stabilize life, reduce physical size, and significantly reduce cost. Pressure is transferred to a conventional, spring-energized seal and the bellows is used only as an impermeable barrier.
This proposal is to test combinations of commercial seals and stem surfaces to find an optimum dyad for the pressure and temperature environments normally expected in process control valve environments.