A Gate Valvesparticularly for controlling the flow of chemicals and corrosives includes a knife edge gate and means to assure parallelism between the gate and a stainless steel gate seat in the valve casing. Cast Gate, Globe, Check ValvesA bonnet on the top of the casing has guides for the gate and allows full withdrawal of the gate from the flow line without the necessity for the gate passing through the gate stem packing. Leakage of the valve is substantially eliminated.
A gate valve comprising a casing including a ring member whose bore defines a flow passage through the valve, an annular flange on the ring member projecting inwardly of said bore and having a side face forming a seat, the ring member having a beveled groove in the bore thereof adjacent said seat and the ring member having a slot substantially tangential to said groove opening through the upper side thereof, a bonnet on said casing extending upwardly therefrom and having opposite side guide grooves registering with and leading upwardly from said slot of the ring member, a plate-like valve element including a beveled edge movably engageable with said seat and said beveled groove through said slot and adapted in one position to completely close said bore defining said flow passage and in a second position to completely open said bore, said valve element in said second position rising into said bonnet, an actuating stem connected with said valve element and extending through and above said bonnet and being screw-threaded on a portion thereof above said bonnet, a packing means for said stem and slidably receiving the stem at the top of said bonnet,GATE VALVES a hand wheel means having threaded engagement with said screw-threaded portion of the stem and operable to raise and lower the stem with said valve element, and support means for the hand wheel means secured to the bonnet and extending substantially thereabove and having a swiveled connection with the hand wheel means.

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