An embodiment includes a gate valve comprising: a valve body including a cavity coupled to a channel having proximal and distal portions; a gate to seal and unseal the channel; proximal and distal seats adjacent the gate; wherein (a) the proximal seat traverses towards the gate and stops at a first position when the gate is closing and the proximal channel portion is more highly pressurized than the cavity, and (b) the distal seat slides away from the gate and stops at a second position when the gate is closing and the cavity is more heavily pressurized than the distal channel portion. Other embodiments are described herein.

A valve which comprises a body (1), a closing member (2) movable in a space (11) between walls (9, 10) of the body transversely in relation to a flow passageway (3) provided through the body between at least two positions, a first position in which the flow passageway (3) is closed, and a second position in which the flow passageway is open, and an actuator (4) for moving the closing member (2) linearly between said at least two positions, which body (1) further comprises an edge part (12, 34). The valve comprises a cleaning arrangement in which an aperture (35, 36) for conducting a medium is arranged in the valve body (1), in a part of the body (1) located on the side of the closing member (2) actuator (4), and is configured to spray a cleaning medium into a part of the space located between walls (9, 10, 12, 34) of the space (11) and the closing member (2). The invention also relates to a method.

An exemplary gate valve includes a valve body having a gate cavity intersecting a through bore, the gate cavity extending through a first end of the valve body, an inner surface forming the gate cavity is angled outward from a center axis of the gate cavity to a gate cavity opening at the first end, and a gate positioned in the gate cavity and moveable between a closed position blocking flow through the through bore and an open position allowing flow through the through bore, the gate having a sealing face extending perpendicular to the through bore.

An embodiment includes a gate valve comprising: a valve body including a cavity coupled to a channel having proximal and distal portions; a gate to seal and unseal the channel; proximal and distal seats adjacent the gate; wherein (a) the proximal seat traverses towards the gate and stops at a first position when the gate is closing and the proximal channel portion is more highly pressurized than the cavity, and (b) the distal seat slides away from the gate and stops at a second position when the gate is closing and the cavity is more heavily pressurized than the distal channel portion. Other embodiments are described herein.

An assembly for actuating a gate valve. The assembly includes an actuator and a bonnet adapter and stem adapter. The assembly includes a bonnet adapter configured to attach to the actuator and configured to attach to a bonnet of the gate valve. An actuator stem is attached to the actuator and extends at least in part into the bonnet adapter. A stem adapter is configured to be positioned within the bonnet adapter and attach to the actuator stem and to a gate valve stem. The bonnet adapter further includes access windows for accessing the stem adapter and the bonnet adapter is configured to permit the actuator stem and stem adapter to move axially therewithin.

An isolation knife gate valve has a valve body including pipe couplings. Removable face sealing elements are attached on either side of the valve body interior to the pipe couplings. A perimeter seal may also be mounted within the valve body. The face sealing elements may include flexible seal elements extending around the opening. The flexible seal elements may cooperate with the perimeter seal, having portions contacting side surfaces of the perimeter seal and other portions contacting faces of the valve gate.

A hydraulic fracturing tree wing is formed with a studded hydraulic valve next to a manual valve. The stud-to-flange connection allows for a shorter, lighter wing. The studded hydraulic valve may be a gate valve that includes a T-slot coupling between an operating stem and the gate. A bonnet seal ridge may be formed to withstand undue deformation during operation that wears or destroys seals. A method for forming a hydraulic fracturing tree assembly includes using a flanged manual valve with a studded hydraulic valve. Other valves and methods are presented.

A sealing ring made of an elastomer material is fitted on the front side of an essentially rectangular valve plate for sealing a vacuum valve opening. On the rear side, the valve plate has a recess with an undercut boundary wall which forms a sloping surface which, for fastening the valve plate on a carrier, is braced with a sloping surface of the carrier. The valve plate has a lug which protrudes beyond the rear side thereof and has a through-passage bore through which a clamping screw is screwable into a threaded bore of the carrier, for bracing the valve plate sloping surface with the carrier sloping surface. In a side view of the valve plate, seen parallel to the longitudinal sides, the straight-line extension of the longitudinal center axis of the through-passage bore runs past the sloping surface at a distance from the rear side of the valve plate.

A gate valve for controlling a flow of a fluid. The gate valve includes a valve body with a first seat pocket and a flow bore, a gate which is movable so as to intersect the flow bore, a seat with a gate end and a body end, a plate with an opening which is positionable on the seat at the gate end, and a plate retainer which is positionable between the seat and the plate so as to prevent an axial movement between the seat and the plate with respect to an axis of the flow bore. The flow bore extends through the valve body for the flow of the fluid. The gate end is arranged to face the gate, and the body end is positionable within the first seat pocket of the valve body.

A valve insert for a valve assembly, the valve insert positionable within a valve inlet end and/or a valve outlet end and including a fluid passageway to permit fluid flow through the valve assembly. The valve insert is formed having an outer surface for supporting the valve insert within the bore and an inner surface defining a fluid passageway, the inner and outer surfaces extending longitudinally between a proximal face configured to engage a valve seat, and an opposed outer face. The valve insert further includes a recessed portion formed on the outer surface, the recessed portion being configured to receive a seal to sealingly engage the bore.