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. 25, 1991
Filed:
Jan. 29, 1990
Floyd V Edwards, Eggertsville, NY (US);
Scott H DeWitt, Lockport, NY (US);
Harmac Medical Products, Inc., Buffalo, NY (US);
Abstract
A check valve, including an inlet housing portion and outlet housing portion which are adapted to be snap-fit together, is inexpensively and quickly produced using valve disks which are capable of providing variable fluid flow resistance. The valve disk is stamped from flexible materials having a Shore A durometer hardness in the range of from about thirty to about one hundred (e.g., a thermoplastic elastomer). Flat, circular shapes having at least three, arcuately-shaped windows defined therein, with an outer sealing periphery being joined to a circular closing member by webs which separate the windows, provide a valve disk of substantial manufacture ease. The check valve is adapted to be used in primary and secondary solution lines, and its variable resistance to fluid flow is enable by merely increasing or decreasing the combined surface area of the windows, increasing or decreasing a preload provided by extending a valve seat in the inlet housing towards the valve disk, increasing or decreasing thicknesses of a valve disk, or varying the proportion of the diameters of the closing member to the valve seat.