Patent ID: 7506660

Claim:
A gate valve for use in severe service applications, comprising: a valve body having a generally cylindrical passage defining a flow path through the gate valve; a gate for controlling fluid flow through the gate valve, the gate being translatable in a plane perpendicular to the flow path between an open position, in which fluid flows through the gate valve and the gate, and a closed position, in which fluid flow is obstructed by the gate; and a replaceable flow-path liner that extends throughout an entire length of the flow path, comprising: a cylindrical steel valve seat received in the flow path on each side of the gate, each cylindrical steel valve seat having an inner end that abuts the gate; a steel wear sleeve received in respective valve body ports of the valve body, the steel wear sleeves having respective inner ends received in respective outer ends of the respective cylindrical steel valve seats; and, a cylindrical steel gate insert received in the flow path through the gate and retained in the flow path through the gate by a mechanical fastener.