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. 17, 1993
Filed:
Jan. 16, 1992
Rand H Ackroyd, Methuen, MA (US);
Watts Investment Company, Wilmington, DE (US);
Abstract
A toggle linkage check valve includes a housing having an inlet and an outlet, and a valve assembly disposed within the housing. The valve assembly includes (i) a sealing plug 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, and (ii) a spring assembly removably disposed within the valve assembly. The spring assembly contacts the sealing plug and biases the sealing plug towards the first, closed position. The spring assembly comprises a rod member and means for biasing the rod member toward the sealing plug. In the second, open position of the sealing plug, the rod member lies at an acute angle to a plane of the sealing plug.