Gate valve with replaceable liner

A gate valve having a positionable gate disposed therein for regulating the flow of fluid intermediate an attached pair of pipes, said gate valve comprising:

• a. a gate having opposing surfaces and being positionable within said gate valve in a first and second position to open and close said gate valve and effect regulation of the flow of fluid;
• b. a one piece pliant liner for receiving, guiding and seating and gate, said liner including:
• i. a chest including a gate passageway with opposing side walls spaced from the opposing surfaces of said gate disposed therebetween;
• ii. a ring defining a bore and extending downwardly from said chest in general planar alignment therewith;
• iii. a depression disposed within said bore for defining a seat and a guide for said gate;
• iv. first seal means disposed near the top of of the opposing side walls within said chest and being in sealing contact with said gate for preventing a flow of fluid through said gate passageway intermediate said chest and said gate;
• v. second seal means disposed within said depression for preventing a flow of fluid through the bore of said ring on seating of said gate within said depression;
• and
• vi. third seal means disposed on opposing side walls within said chest for sealing contact with the opposing surfaces of said gate for preventing a flow of fluid intermediate said chest and said gate when said gate is in the first position;
• c. a pair of castings for receiving said liner, each of said castings including:
• i. bore for receiving a part of said ring;
• ii. a recess for receiving a part of said chest;
• and
• iii. attachment means for securing said pair of castings to one another to at least partially enclose said liner therebetween;
• whereby , said liner includes seal means for precluding a flow of fluid intermediate said gate and said chest.