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:
Jun. 28, 1977
Filed:
Sep. 02, 1975
Leif Nielsen, Nordborg, DK;
Danfoss A/S, Nordborg, DK;
Abstract
The invention relates to a thermostatic expansion valve assembly for a refrigeration installation of the type having condenser and evaporator units. The valve assembly controls the flow of refrigerant between the condenser and the evaporator and has a conventional operating unit which is dependent upon the superheat temperature of the evaporator. Condenser pressure for summer operation is on the order of being five to ten times greater than for winter operation and this represents a greater flow quantity. Compensation for this variance in condenser pressure is provided by a seat and closure member design in which the valve is caused to open at a slower rate than any increase in the condenser pressure. This is done by equipping the closure and valve seat with a piston and cylinder construction which defines an expansible chamber which has fluid communication with the condenser inlet port. An increase in condenser pressure causes expansion of the expansible chamber which in turn effects a closing force on the valve parts.