F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/20
F16K 31/50 (2006.01) F16K 31/528 (2006.01)
Patent
CA 1187855
HIGH TORQUE PLUG VALVE ACTUATOR ABSTRACT OF THE DISCLOSURE A high torque actuator for a plug valve of the type having a body with a central chamber having diametrically opposed inlet and outlet ports and a plug within the chamber having a transverse passage therethrough and an upstanding stem. The plug has a first, upper, valve-open position with its transverse passage in alignment with the inlet and outlet ports of the chamber, and a second, lower valve-closed position wherein its transverse passage is oriented at 90° to the chamber inlet and outlet ports and seal means on the plug are in sealing engagement with the chamber walls about the inlet and outlet ports. Means closing the top of the chamber through which the plug stem extends in fluid-tight fashion. The actuator comprises a hollow cylindrical yoke the lower end of which is operatively affixed to the plug valve with the plug stem extending axially into the yoke. A valve stem is rotatively mounted at the upper end of the yoke and has a lower threaded portion extending axially into the yoke. The valve stem is threadedly engaged with a drive cam non-rotatively mounted within the yoke and axially-shiftable by the valve stem within the yoke. The lower portion of the drive cam has a diametrically opposed identical pair of sloped drive slots therein and is received in the axial bore of a coupling and is affixed thereto by a drive pin passing through the drive cam drive slots with its ends mounted in diametrically opposed perforations in the coupling. The upper end of the plug stem is non-rotatively affixed to the cylindrical coupling. The coupling has diametrically opposed cam slots formed therein. The yoke supports a cam follower for each cam slot. The cam slots are so configured that upon turning the valve stem in one direction, the plug in its valve-open position will be simultaneously partially lowered and turned 90° and thereafter lowered without rotation to its valve-closed and sealed position. Upon turning the valve stem in the opposite direction, the plug will first be lifted vertically without rotation out of sealing relationship with the chamber inlet and outlet ports and thereafter simultaneously lifted and rotated 90° to its valve-open position. The drive cam and its slots impart additional torque to the coupling during rotation of the plug.
406786
Mueller John H.
Grove Truseal Valve Company
Smart & Biggar
LandOfFree
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