Abstract: A knife gate valve is provided, comprising: a unitary valve body having a flow channel extending there through, a guide segment and a stuffing box. A knife gate is located in the guide segment, the stuffing box and the flow channel and is slideable between an open and closed position. Lateral seals are provided in the stuffing box and can be replaced while the valve body is connected in its associated fluid system. These seals include an injectable sealing material contained in the stuffing box. A knife gate seat is provided in the valve body for sealing the knife gate and it can be replaced without completely removing the valve body from its associated fluid system.

Abstract: A gate seal for a knife gate valve comprising a sealing surface lining the gate channel and an integral gasket for compression between valve body halves, a chest seal for a knife gate valve comprising a body having an expandable sealing surface and one or more injection chambers adapted to receive an injectable packing, each chamber having a cross-sectional area that is completely surrounded by the body member, and/or a knife gate valve comprising one or both such seals. The chest seal body may comprise a knife gate slot that is peripherally surrounded by the body. The gate seal and the chest seal may comprise a single integral elastomeric member or separate components.

Abstract: A knife gate valve is provided, comprising: a unitary valve body having a flow channel extending there through, a guide segment and a stuffing box. A knife gate is located in the guide segment, the stuffing box and the flow channel and is slideable between an open and closed position. Lateral seals are provided in the stuffing box and can be replaced while the valve body is connected in its associated fluid system. These seals include an injectable sealing material contained in the stuffing box. A knife gate seat is provided in the valve body for sealing the knife gate and it can be replaced without completely removing the valve body from its associated fluid system.