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Browse Prior Art Database

TRANSIENT CONTROL VALVE

IP.com Disclosure Number: IPCOM000024811D
Original Publication Date: 1982-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

A transient control valve 1 for regulating pressure variations inside an ink cavity 2 from which ink under pressure is squirted to generate ink droplets for printing. During droplet generator startup, the ink inside the cavity experiences several pressure oscillations until a steady state pressure is achieved. Air in the fluid system also renders less stable the system startup. The disclosed valve 1 vents air from the cavity as well as controls pressure variations thereby reducing generator performance variations at startup.

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XEROX DISCLOSURE JOURNAL

TRANSIENT CONTROL VALVE Proposed Donald N. Kords Classification

U.S. C1. 346/75 Int. C1. Gold 15/18

0

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A transient control valve 1 for regulating pressure variations inside an ink cavity 2 from which ink under pressure is squirted to generate ink droplets for printing. During droplet generator startup, the ink inside the cavity experiences several pressure oscillations until a steady state pressure is achieved. Air in the fluid system also renders less stable the system startup. The disclosed valve 1 vents air from the cavity as well as controls pressure variations thereby reducing generator performance variations at startup.

The valve 1 comprises a movable pressure seat 4 which experiences a downward force dictated by the setting of an adjustable spring compressor 5 and an upward force from the fluid inside the ink cavity 2. The downward force can be varied by adjusting the compression of a spring 8 which contacts the seat 4. So long as the spring compressor exerts a greater force than the fluid, a seal closes the valve 1. When pressure oscillations cause the fluid pressure to exceed the spring force, however, the seat 4 moves allowing fluid venting through a vent 7. Since the spring compressor is adjusted to exert a force slightly greater than the steady state force the fluid exerts on the seat 4, the valve 1 is closed during steady state operation. The valve 1 serves the dual purpose of both venting air from the system and reducing pr...