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Vacuum Gate Valve Actuating Shaft Seal Adaptor

IP.com Disclosure Number: IPCOM000080671D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Carbone, QJ: AUTHOR [+2]

Abstract

The vacuum sealing 0-rings for the actuating shaft of a conventional pneumatically operated gate valve, wear during normal operation. Such continual wear results in an increased leak rate that can limit the high-vacuum pumping performance of a vacuum system.

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Vacuum Gate Valve Actuating Shaft Seal Adaptor

The vacuum sealing 0-rings for the actuating shaft of a conventional pneumatically operated gate valve, wear during normal operation. Such continual wear results in an increased leak rate that can limit the high-vacuum pumping performance of a vacuum system.

Shown is a simple shaft seal adaptor which has been designed to provide a positive seal against this inherent leakage of the system when the valve is in the open, high-vacuum position.

As shown, the shaft seal adaptor 1 is positioned on the valve actuator shaft 2. The adaptor positioning 3 seals the valve actuator shaft 2 with the shaft seal 0- ring 4. With the valve actuator shaft 2 in the open (high vacuum) position, the valve housing seal 0-ring 6 is compressed against the inner surfaces of the valve housing end plate 7. The resultant seal eliminates the inherent leakage of the vacuum 0-ring seals, resulting in improved high-vacuum-pumping performance and reduced process contamination.

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