Patent · US Expired

Self-compensating solenoid valve

US4681142A · kind A · utility

14Cited by

7References

5Claims

0Family size

Assignee

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

Fritz H. Woeller · Sunnyvale, US
Yutaka Matsumoto · Ueda, JP

Key dates

Filing date	Nov 7, 1985
Grant date	Jul 21, 1987
Priority date	—
Expiry date	Nov 7, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/88038
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

Solenoid valve (10) has a valve chamber (18) within valve body (12). Inlet and outlet tubes (22) and (24) extend through plate (14) into the chamber (18). Movable core (32) in chamber (18) extends into solenoid coil (30). Distal end (38) of core (32) has a silicone rubber plug (40). Other than when solenoid (30) is energized, compressed spring (48) biases core (32) downward so that surface (44) of the plug (40) is in sealing engagement with ends (26) and (28) of the tubes (22) and (24). Any leak at ends (26) and (28) increases pressure in the chamber (18), resulting in increased sealing force of the plug (40) against the other end (26) or (28). Flow direction through the valve (20) is easily reversed by changing connections to the tubes (22) and (24).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.