Title: Wedge-type gate valve

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Abstract: A wedge-type gate valve with a one-piece gate or wedge movable longitudinally of itself in the valve chamber and transversely of the flow passage between open and closed positions. The gate is a one-piece structure having longitudinal V-shaped guide grooves in opposite edges thereof into which extend aligned, conical guide pins carried by the valve body. The edges of the wedge are also provided with inclined cam grooves engageable by the guide pins to cam the wedge against one of its seats in the open position of the wedge. The wedge is provided with a lubricant annulus communicating with one or both valve seats in the closed position of the wedge, the lubricant annulus being provided with a suitable lubricant through a threaded actuating stem. The inner end of the actuating stem has a doubly-tapered radially-outwardly-convergent head disposed in a complementary socket in the wedge, with seals between the wedge and such head, on both sides of the head.


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