Patent ID: 9261196
Filing Date: 2016-02-16
CPC Classification: F16K,Y10T

Claim Text:
1. A method of opening and closing a flow line, comprising: (a) providing a gate valve with a valve body with a flow passage intersected by a gate cavity; (b) moving a gate within the gate cavity between a gate closed position and a gate open position, the gate having a downstream gate face, and an upstream gate face on an opposite side; (c) providing a seat ring between each gate face and the valve body, at the intersection of the flow passage and the gate cavity; (d) providing an annular seal between each of the seat rings and the valve body, wherein each of the seals comprises a one way seal, the method further comprising allowing the fluid flow to pass by one of the seals from the flow passage towards the gate cavity; and (e) filtering a fluid flow along a flow path between at least one of the seat rings and the valve body with a filter located radially inward from one of the annular seals relative to an axis of the flow passage.