Browse Prior Art Database

Throttle Valve for Diffusion Pump

IP.com Disclosure Number: IPCOM000073534D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Schneider, RV: AUTHOR

Abstract

As shown in Drawings A and B, the valve employs an inflatable seal 1 mounted on a pivoted paddle 2 with an air supply 3 to the paddle and shaft 4. Before the throttle valve is brought into full sealing position as in Drawing A, the seal 1 is in a deflated state and, at the time required, e.g., Drawing B, the seal is inflated to expand against the throttle throat surface 5. When the throttle valve is to be rotated open, the seal 1 deflates, therefore losing contact with the throat walls. The paddle 2 can now be pivoted up with no friction or wear occurring on the seal. The valving can also be accomplished as shown in Drawings C and D by locating the seal 6 within the throat walls 7 in a deflated condition.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 98% of the total text.

Page 1 of 2

Throttle Valve for Diffusion Pump

As shown in Drawings A and B, the valve employs an inflatable seal 1 mounted on a pivoted paddle 2 with an air supply 3 to the paddle and shaft 4. Before the throttle valve is brought into full sealing position as in Drawing A, the seal 1 is in a deflated state and, at the time required, e.g., Drawing B, the seal is inflated to expand against the throttle throat surface 5. When the throttle valve is to be rotated open, the seal 1 deflates, therefore losing contact with the throat walls. The paddle 2 can now be pivoted up with no friction or wear occurring on the seal. The valving can also be accomplished as shown in Drawings C and D by locating the seal 6 within the throat walls 7 in a deflated condition. When the paddle 8 is brought to a fully closed position, as in Drawing D, the seal can be inflated with the pressure of the seal brought against the paddle. Since there is no sliding friction in the inflatable seal and the throttle valve walls, wear is eliminated. Another advantage of the inflatable throttle valve seal is the inherent ability to control the deflation of the seal which is a desirable feature in a vacuum system. By slowing down the opening of the throttle valve, a minimum disturbance to the operation of a diffusion pump is achieved. Also, the surface finish of the throat area where sealing takes place need not be a highly polished surface due to the large surface sealing area.

1

Page 2 of 2

2

[This page contains 1...