Reversing valve construction and piston head assembly therefor and methods of making the same

US4245670A · kind A · utility

Assignee

• Robertshaw Controls Company · US

Inventors

• Werner Bauer · Neuötting, DE
• Robert A. Van Fossen · Richmond, US

Key dates

• Filing date: Nov 6, 1978
• Grant date: Jan 20, 1981
• Expiry date: Nov 6, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86726
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A reversing valve construction having a housing provided with a movable valve member therein that is interconnected to a piston unit having opposed piston heads that define a main chamber of the housing therebetween. The housing has opposed ends respectively cooperating with the piston heads to define a pair of opposed control chambers therebetween, the ends respectively having valve seats leading to the control chambers. Each piston head has a flexible seal member secured between a front disc member and a backing plate of the respective piston head so that an integral peripheral skirt of that seal member is urged into sliding and sealing engagement with an internal peripheral surface of the housing by an annular resilient O-ring member carried by the respective piston head and radially engaging and urging its respective skirt radially outwardly into the sliding and sealing engagement. Such seal member for each piston head can be adapted to close a valve seat carried by a respective end of the housing.