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:
Jul. 17, 1984
Filed:
Sep. 07, 1982
James R Nanci, Pittsburgh, PA (US);
James MacGregor, Claysville, PA (US);
Ralph A. Hiller Company, Pittsburgh, PA (US);
Abstract
A valve stem actuator for a slurry valve or the like includes a support frame extending from the valve body to a linear operator having a cylinder and piston. Means are provided for connecting the piston rod to the valve stem and means reciprocally mounted on the support frame rotate the valve stem with respect to the valve body independently of the linear movement of the valve stem to dislodge accumulated crust to permit the valve disc to properly seat to prevent fluid flow through the valve. The linear operator is preferably pneumatically or hydraulically actuated and the rotary actuator preferably comprises an air or hydraulically actuated rack engageable with the valve stem. The valve stem actuator is useful for new valves or for retrofit of present slurry valves or the like.