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A gate valve has a manual actuator that includes a crank having a direct pivotal connection with a slidable valve plate. The valve plate has a teardrop configuration that enables the valve plate to swing around the pivot connection as the plate slides along guide slot edge surfaces, between a closed

A gate valve has a manual actuator that includes a crank having a direct pivotal connection with a slidable valve plate. The valve plate has a teardrop configuration that enables the valve plate to swing around the pivot connection as the plate slides along guide slot edge surfaces, between a closed position and an open position. Only a relatively small manual force is required to operate the valve.

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[ Having described my invention, I claim:] [1.] A gate valve comprising:a valve housing that includes two housing sections (12, 14) having outer peripheral flat surfaces sealably joined together, and inner facing flat surfaces spaced apart to form a guide slot (31); each housing section having a cir

[ Having described my invention, I claim:] [1.] A gate valve comprising:a valve housing that includes two housing sections (12, 14) having outer peripheral flat surfaces sealably joined together, and inner facing flat surfaces spaced apart to form a guide slot (31); each housing section having a circular hole in the associated inner flat surface, and an annular elastomeric sealing ring (29) seated on each housing section within the respective circular hole to form a flow opening;said housing sections being internally recessed to form a crank cavity (36, 38) communicating with said guide slot; said guide slot having two parallel linear edges (33) continuing beyond the slot to form boundary edge surfaces for the crank cavity; said crank cavity having facing major surfaces spaced apart by said boundary edge surfaces;a slidable valve plate (26) disposed in said guide slot for slidable movement between a closed position blocking flow through said flow opening, and an open position permitting flow through said flow opening;a manual crank (35) located within said crank cavity for swinging motion around a swing axis that extends parallel to the axis of the flow opening;a pivotal connection (45) between said crank and said slidable valve plate, whereby said plate swings around said pivotal connection as it slides within the guide slot between its open and closed positions;said slidable valve plate having a semi-circular edge section (51) that has a diameter equal to the spacing between the linear edges of said guide slot, said simicircular edge section having a pair of camming surfaces, whereby said valve plate camming surfaces engage at least a portion of said linear edges, in all positions of said valve plate;said crank having a swing arc around said swing axis of one hundred eighty degrees during movement of the slidable valve plate between its open and closed positions;said swing axis being located relatively close to one of said boundary edge surfaces and relatively remote from the other boundary edge surface; said crank having a free end that passes closely alongside said other boundary edge surface during arcuate movement of the crank around the swing axis;said valve plate and said crank having overlapping areas; said pivotal connection comprising a pivot pin extending transversely through the overlapping areas of said valve plate and crank, and an enlarged disk (47) connected to said pin; said disk having a flat face in close proximity to one of the facing major surfaces of the crank cavity;the flat facing surfaces of said guide slot having a constant spacing over the entire extent of the guide slot, whereby said guide slot maintains the valve plate in a single plane during movement between the open and closed positions; andthe semi-circular edge section on said valve plate having a knife edge sharpness, whereby said valve plate is enabled to readily pass into the space between said sealing rings as the valve plate moves to the closed position.