Fracturing systems with frac valves having gates for controlling flow of fracturing fluid are provided. In one embodiment, a fracturing apparatus includes a frac valve having a housing with a cavity transverse to a bore. A gate is positioned in the cavity and is movable between open and closed positions to selectively block flow through the bore. The gate includes a seal assembly positioned to seal against a sidewall of the cavity to surround the bore and block flow through the frac valve when the gate is in the closed position. The seal assembly can be actuated between a less-energized state and a more-energized state following movement of the gate within the cavity from the open position to the closed position. Additional systems, devices, and methods for fracturing are also disclosed.

A choke may include an inlet for receiving a flow stream. The choke may also include a valve assembly configured to receive the flow stream from the inlet and control the flow stream. The valve assembly may include a cage element, an external sleeve adapted for selectively and controllably articulating over the cage element to control the flow stream through the valve, and an impact screen surrounding both the cage element and the external sleeve and adapted to protect the cage element and the external sleeve from impacts from large objects in the flow stream. The choke may also include an outlet for delivering the flow stream from the valve assembly.

A choke may include an inlet for receiving a flow stream. The choke may also include a valve assembly configured to receive the flow stream from the inlet and control the flow stream. The valve assembly may include a cage element, an external sleeve adapted for selectively and controllably articulating over the cage element to control the flow stream through the valve, and an impact screen surrounding both the cage element and the external sleeve and adapted to protect the cage element and the external sleeve from impacts from large objects in the flow stream. The choke may also include an outlet for delivering the flow stream from the valve assembly.

A bonnet seal assembly for a gate valve includes a generally cylindrical packing nut positioned in the stem bore around the valve stem. The packing nut includes first and second spaced-apart annular sealing surfaces, and the bonnet seal assembly includes a third annular sealing surface connected to or formed integrally with the valve stem and a fourth annular sealing surface formed concentrically in the stem bore. In a first position of the valve stem, the first annular sealing surface sealingly engages the third annular sealing surface to thereby form a first seal between the valve stem and the packing nut, and the second annular sealing surface sealing engages the fourth annular sealing surface to thereby form a second seal between the packing nut and the stem bore. In this manner, the first and second seals together operate to seal the stem bore from fluid pressure in the gate cavity.

An equalization valve includes a valve body defining a gate slot; a gate defining an equalization chamber, a first equalization channel, and a second equalization channel, the equalization chamber and the first and second equalization channels defining an equalization pathway across the gate; and an actuation stem slidable within the equalization chamber between a first chamber position, wherein the actuation stem blocks the equalization pathway, and a second chamber position, wherein the actuation stem unblocks the equalization pathway; wherein the actuation stem is further slidable within the gate slot of the valve body between a first valve position, wherein the gate is seated with the valve body, and a second valve position, wherein the gate is unseated from the valve body.

Example aspects of an equalization valve are disclosed. The equalization valve can comprise a gate defining a first face, a second face, and a sidewall extending between the first face and second face, the gate further defining an equalization chamber extending into the sidewall, a first equalization channel extending from the first face to the equalization chamber, and a second equalization channel extending from the second face to the equalization chamber; and an actuation stem defining a lower portion slidably engaged with the equalization chamber, the actuation stem movable between a first position, wherein the actuation stem blocks the first equalization channel to prevent the flow of one of gas and fluid through the equalization valve, and a second position, wherein the actuation stem unblocks the first equalization channel to allow the flow of the one of gas and fluid through the equalization valve.

Example aspects of an equalization valve are disclosed. The equalization valve can comprise a gate defining a first face, a second face, and a sidewall extending between the first face and second face, the gate further defining an equalization chamber extending into the sidewall, a first equalization channel extending from the first face to the equalization chamber, and a second equalization channel extending from the second face to the equalization chamber; and an actuation stem defining a lower portion slidably engaged with the equalization chamber, the actuation stem movable between a first position, wherein the actuation stem blocks the first equalization channel to prevent the flow of one of gas and fluid through the equalization valve, and a second position, wherein the actuation stem unblocks the first equalization channel to allow the flow of the one of gas and fluid through the equalization valve.

Fracturing systems with frac valves having gates for controlling flow of fracturing fluid are provided. In one embodiment, a fracturing apparatus includes a frac valve having a housing with a cavity transverse to a bore. A gate is positioned in the cavity and is movable between open and closed positions to selectively block flow through the bore. The gate includes a seal assembly positioned to seal against a sidewall of the cavity to surround the bore and block flow through the frac valve when the gate is in the closed position. The seal assembly can be actuated between a less-energized state and a more-energized state following movement of the gate within the cavity from the open position to the closed position. Additional systems, devices, and methods for fracturing are also disclosed.

Fracturing systems with frac valves having gates for controlling flow of fracturing fluid are provided. In one embodiment, a fracturing apparatus includes a frac valve having a housing with a cavity transverse to a bore. A gate is positioned in the cavity and is movable between open and closed positions to selectively block flow through the bore. The gate includes a seal assembly positioned to seal against a sidewall of the cavity to surround the bore and block flow through the frac valve when the gate is in the closed position. The seal assembly can be actuated between a less-energized state and a more-energized state following movement of the gate within the cavity from the open position to the closed position. Additional systems, devices, and methods for fracturing are also disclosed.

Provided is a gate valve with a disk replacement structure. The gate valve is installed on a pipe, and comprises: a valve body having a blocking space formed therein, a pair of flange pipes formed to communicate with the blocking space, and a cover mounted on an upper side thereof to close the blocking space; a disk arranged in the blocking space to be lifted and provided with a mounting hole which is formed on an upper surface thereof and has a lifting nut therein; and an operating rod installed on the cover to lift the disk. An insertion hole is formed on the cover to penetrate the cover.