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:
Jan. 05, 1993
Filed:
Dec. 12, 1991
Rand H Ackroyd, Methuen, MA (US);
Watts Regulator Company, Lawrence, MA (US);
Abstract
A toggle linkage check valve includng a housing having an inlet and an outlet and a sealing plug disposed within the housing and adapted for movement between a first, closed position for preventing flow of liquid between the inlet and the outlet, and a second, open position for substantially permitting flow of liquid between the inlet and the outlet. The check valve includes a spring assembly removably disposed within the housing. The sealing plug is mounted upon the spring assembly. The spring assembly includes a rod member and a means for biasing the rod member toward the sealing plug. In the first position of the sealing plug, the rod member lies substantialy perpendicular to a plane of the sealing member across the inlet, and in the second position of the sealing plug, the rod member lies at an acute angle to the plane of the sealing member. The means for biasing acts upon the rod member to apply, to the sealing plug, a biasing force of a second degree less than the first degree, whereby the spring assembly acts upon the sealing plug to provide a maximum resistance against liquid flow from the inlet toward the outlet when the sealing plug is in the first, closed position and a lesser resistance against liquid flow when the sealing plug is in the second, open position.