The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 1991
Filed:
Jun. 28, 1990
Alan S Drucker, DeWitt, NY (US);
Carrier Corporation, Syracuse, NY (US);
Abstract
A flow metering device for use as an expansion valve in a heat pump system includes a body having a flow passage extending therethrough. Two pistons are moveably disposed within the flow passage. Each piston has a flow metering port extending therethrough and a bypass flow means associated therewith. A refrigerant metering rod is fixed within the flow passage and extends through both metering ports. The rod has two flow metering configurations formed thereupon, each of which cooperates with one of the pistons to define a variable area flow passage within the valve. The pistons are spring biased to closed positions when there is no flow through the valve. Flow in one direction results in metering through the variable area passage defined by one piston and its associated flow configuration and free flow through the bypass means of the other piston. Flow through the valve in the opposite direction reverses the roles of the pistons.