PACKINGLESS GATE VALVE AND ACTUATOR ASSEMBLIES

摘要

A packingless gate valve having a stepped through passage defined by respective half housings formed with passages of different diameter and respective bolt connector flanges disposed in face to face relation with spacer strips interposed between diametrically opposite flange face margins to define a laterally related gate passage, a compressible elastomeric liner sleeve fitted to the passage of greater diameter with its opposite ends protruding axially from the passage ends and the end opposed to the flange face defining the end of the smaller diameter passage formed to span the gate passage and provide a protruding lip sealingly engaging the last mentioned flange face in annular surrounding relation to the smaller diameter passage end, a gate having a leading knife edge slidingly mounted in the gate passage with the lead tip of the knife edge disposed to enter the line of seal and deform the lip into sealing engagement with the opposed face of the knife edge and gate in its reciprocal movement in the gate passage, and actuator means operatively supported by the connector flanges and connected to the gate to effect controlled movement of the gate between its open and closed positions. The packingless gate valve is adapted for spigot or take off point mounting relative to a pipe line sidewall passage by means of a suitably formed saddle and pipe wall sealing gasket clampingly disposed between the pipe outer wall and the opposite end of the housing defining the larger diameter through passage by pipe encircling straps connected to the corners of the housing connector flanges by suitable draw bolt and nut assemblies.