Abstract: A fixing device for clamping a tissue including a clamp mechanism for closing a tissue, a support mechanism for carrying the clamp mechanism, the support mechanism including a drive assembly for driving the clamp mechanism to open and close; a delivery control device including a push shaft for pushing the fixing device and a mechanism for enabling the push shaft and the fixing device to be separably connected, the clamp mechanism includes a pair of closure members, a guide slot including at least a nonlinear segment in each of the pair of closure members, a pin slidable in each guide slot to drive ends of closure clamping portions of the closure members to move towards or away from each other.

Abstract: A piston check valve system includes a body including an upstream end and a downstream end, a bonnet secured to a proximal opening of the body, and a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat. The piston check valve system also includes a retainer configured to guide and retain the piston and to secure the valve seat within the body.

Abstract: A piston check valve system includes a body including an upstream end and a downstream end, a bonnet secured to a proximal opening of the body, and a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat. The piston check valve system also includes a retainer configured to guide and retain the piston and to secure the valve seat within the body.

Abstract: A valve includes a valve body including a first fluid, a second fluid port, and an interior passage fluidly connecting the first and second fluid ports, a bore extending inwardly of the valve body and terminating in an annular first seat securement surface extending around the interior passage, the second fluid port fluidly connected to the bore, a cage disposed in the bore, the cage having an annular second seat securement surface and an opposed first annular surface, the annular second seat securement surface facing the annular first seat securement surface, a cover extending over the first wall of the valve body and including a cage engagement surface contacting the first annular surface, and an annular seat having a main body having an opening therethrough and comprising a first annular region having a first elevation and a second annular region having a second elevation different than the first annular region.

Abstract: A pool cycling valve system with a pool cycling valve, a plurality of water zones, an interface, and a microcontroller. The pool cycling valve has a valve body with an inlet port and a plurality of outlet ports. Each of the plurality of water zones is configured to fluidly couple with a respective outlet port of the plurality of outlet ports. The interface is configured to receive input from a user for a user-selected sequence for activating each water zone, a user-selected duration of activate time per water zone, and a number of water pressure cycles for a particular water zone to receive prior to activation of a subsequent water zone. The interface is configured to communicate the input to the microcontroller. The microcontroller is configured to intelligently and selectively discharge water to each of the plurality of water zones based on the input received from the interface.

Abstract: A shear seal includes a seal plate having a first seal surface and a sliding seal assembly having a second seal surface, and at least one of the first and second sealing surfaces comprise an insert comprising a material different than that of the seal plate or the sliding seal connected to the seal plate or sliding seal assembly by a compressed member disposed between the insert and the adjacent surface of seal plate or sliding seal assembly.

Abstract: A gate valve system includes a body including an upstream end, a downstream end, and a flow path extending through the upstream end and the downstream end. The gate valve system includes a gate assembly extending within the body, the gate assembly including a gate a stem secured to the gate and configured to place the expandable gate in a first position in which a flow of fluid is permitted between the upstream end and the downstream end and a second position in which the flow of fluid is prevented. The gate valve system also includes a lubrication port in an exterior of the body, the lubrication port being in fluid communication with an interior of the body and including a lubrication guiding insert configured to guide a supply of lubricating fluid to a location inside the body and between the upstream end and the downstream end.

Abstract: A pressure relief valve includes a valve body including a monitored pressure inlet leading to a monitored pressure region, a piston having a shear seal bore and a surface facing the monitored pressure region, a vent passage and a the shear seal assembly comprising a seal plate having a sealing surface thereon, and the shear seal assembly includes a sealing surface facing the seal plate and having a first annular area, and a first surface having an annular surface area at least twice as large as the first area of the sealing surface, the first surface facing away from the first area, and a biasing seal in contact with the first surface.

Abstract: A pool cycling valve with a valve body, a ratchet assembly, and a bottom plate. The valve body has an inlet port and a plurality of outlet ports. The ratchet assembly is rotatably coupled to the valve body and has a ratchet arm extending away from the ratchet assembly. When in a closed position, the ratchet assembly is configured to interfere with a stream of water. When in a open position, the ratchet assembly is rotated from the closed position by a predetermined angle. The bottom plate has an outlet port aperture aligned with one of the outlet ports and a ratchet tooth operably aligned with the ratchet arm. When the ratchet assembly rotates from the open position to the closed position, the ratchet assembly aligns the outlet port aperture with a different outlet port.

Abstract: A method for operating a pool cycling valve includes receiving a stream of water into a valve body through an inlet port to a ratchet assembly in a closed position configured to interfere with the stream of water flowing through the inlet port. Rotating the ratchet assembly from the closed position to an open position, directing the stream of water to a bottom plate outlet port aperture aligned with an outlet port of the valve body. Discharging the stream of water through the outlet port aperture and the outlet port. Rotating the ratchet assembly from the open position to the closed position. Aligning the outlet port aperture with a different outlet port in response to a water pressure change, such as a combination of an increase and a decrease in water pressure, within the valve body.

Abstract: A ball valve system includes a body having an upstream end and a downstream end and a ball within the body between the upstream end and the downstream end, the ball being rotatable about a vertical axis to move between a closed position and an open position. The ball valve assembly includes a stem movable in an actuation direction substantially parallel to the vertical axis, the stem including a recess at a proximal portion of the stem, a guiding member extending within the recess of the stem, the guiding member being configured to prevent rotation of the stem or cause rotation of the stem, and a lubrication port in fluid communication with the recess.

Abstract: A gate valve system includes a body including an upstream end, a downstream end, and a flow path extending through the upstream end and the downstream end. The gate valve system includes a gate assembly extending within the body, the gate assembly including a gate a stem secured to the gate and configured to place the expandable gate in a first position in which a flow of fluid is permitted between the upstream end and the downstream end and a second position in which the flow of fluid is prevented. The gate valve system also includes a lubrication port in an exterior of the body, the lubrication port being in fluid communication with an interior of the body and including a lubrication guiding insert configured to guide a supply of lubricating fluid to a location inside the body and between the upstream end and the downstream end.

Abstract: An aquifer storage and recovery system can include a pump, an electric motor coupled to the pump, a drive unit configured to control operation of the electric motor, and a controller. The controller can be configured to flow water into a well bore from a source reservoir through the pump such that the pump rotates in a reverse direction and drives the electric motor coupled to the pump in the reverse direction to operate as a generator, determine a power output of the electric motor, determine a difference between the power output of the electric motor and a power output set point, and operate the drive unit to control a rotational speed of the electric motor based at least in part on the difference between the power output of the electric motor and the power output set point.

Abstract: A choke includes a cage having a plurality of openings extending therethrough, a first fluid port and a second fluid port, the openings in the cage fluidly interposed between the first and second fluid ports, and a selectively positionable blocking member positioned with respect to the openings to selectively overlie all of a portion of the openings, wherein the surface of the opening extending through the cage are a single crystal material. The single crystal material may be provided as an insert, having an opening therethrough, secured in position with respect to the cage.

Abstract: A ball valve system includes a body having an upstream end and a downstream end and a ball within the body between the upstream end and the downstream end, the ball being rotatable about a vertical axis to move between a closed position and an open position. The ball valve assembly includes a stem movable in an actuation direction substantially parallel to the vertical axis, the stem including a recess at a proximal portion of the stem, a guiding member extending within the recess of the stem, the guiding member being configured to prevent rotation of the stem or cause rotation of the stem, and a lubrication port in fluid communication with the recess.

Abstract: An aquifer storage and recovery system can include a pump, an electric motor coupled to the pump, a drive unit configured to control operation of the electric motor, and a controller. The controller can be configured to flow water into a well bore from a source reservoir through the pump such that the pump rotates in a reverse direction and drives the electric motor coupled to the pump in the reverse direction to operate as a generator, determine a power output of the electric motor, determine a difference between the power output of the electric motor and a power output set point, and operate the drive unit to control a rotational speed of the electric motor based at least in part on the difference between the power output of the electric motor and the power output set point.

Abstract: A piston check valve system includes a body including an upstream end and a downstream end, a bonnet secured to a proximal opening of the body, and a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat. The piston check valve system also includes a retainer configured to guide and retain the piston and to secure the valve seat within the body.

Abstract: A piston check valve system includes a body including an upstream end and a downstream end, a bonnet secured to a proximal opening of the body, and a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat. The piston check valve system also includes a retainer configured to guide and retain the piston and to secure the valve seat within the body.

Abstract: A valve cartridge may include an outer cylindrical body and an inner cylindrical body disposed in a channel formed by the outer cylindrical body. The outer cylindrical body may include a wall that defines the channel. The outer cylindrical body may include a ramped slot. The ramped slot may extend angularly from a first angular position on the wall to a second angular position. The ramped slot may extend longitudinally from a first longitudinal position on the wall to a second longitudinal position. The inner cylindrical body may include a handle interface approximate to a first end of the inner cylindrical body. The inner cylindrical body may include a pin extending radially from the inner cylindrical body and into the ramped slot. The inner cylindrical body may include a valve seat at a second end of the inner cylindrical body.

Abstract: A pressure relief valve includes a valve body including a monitored pressure inlet leading to a monitored pressure region, a piston having a shear seal bore and a surface facing the monitored pressure region, a vent passage and a the shear seal assembly comprising a seal plate having a sealing surface thereon, and the shear seal assembly includes a sealing surface facing the seal plate and having a first annular area, and a first surface having an annular surface area at least twice as large as the first area of the sealing surface, the first surface facing away from the first area, and a biasing seal in contact with the first surface.