Abstract: A check valve for low pressure operating conditions includes: a valve cover, a valve body, and an upper diaphragm between the body and the cover. A first pressure cavity is provided on a lower surface of the valve cover and used for accommodating a backward direction medium, a second pressure cavity is machined on an upper surface of the valve body, within which an inflow passage and an outflow passage are provided, an inflow hole is machined from an inner wall of the inflow passage to a bottom face of the second pressure cavity, and a medium enters into the second pressure cavity from the inflow passage via the inflow hole, and applies upward pressure on the upper diaphragm. A backflow channel in communication with the first pressure cavity is machined on a side wall of the outflow passage.

Abstract: A self-sealing back draft damper for fully stopping backflow air through exhaust fans and extractor hoods. Contains a housing (1), with exit openings (2) and can have at least one mounting hole (10). Inside the housing (1) at least one inclined relative to the horizontal plane conical tapered tube (3) is airtightly fixed at its lower positioned narrow end to the hole (10), forming the conical tapered inlet (6) of the damper. Apertures are available on the tube part inside the housing. The tube (3) contains a spherical closing member (5) freely movable inside it, which closes the conical tapered inlet (6) and opens it when pushed away by airflow in direction to the vent. The axis of the tapered tube (3) can be also vertically oriented. The damper is airtightly attached preferrably to the entrance of a fan, to the exhaust of an extractor hood or a vent.

Abstract: A pneumatic valve control device includes an air cylinder. The air cylinder includes a first piston; an air outlet; and a locking and releasing mechanism configured to lock and release the first piston when the first piston is pushed up. The device also includes a hydraulic cylinder. The hydraulic cylinder includes a second piston; an air vent disposed on a first side of the second piston; and a liquid inlet and a liquid outlet disposed on a second side of the second piston. The device also includes a partition disposed between the hydraulic cylinder and the air cylinder; a partition channel disposed on the partition; a piston rod connected to the second piston and configured to pass through the partition channel; and a tappet valve connected to the piston rod and configured to leave the partition channel in response to an upward movement of the piston rod.

Abstract: Provided is a valve assembly and method for opening and closing thereof. The valve assembly, in one aspect, includes a valve body having inlet and outlet flow passageways connected by a valve chamber, and a ball valve member having a bore there through creating a ball/bore interface, the ball valve member located in the valve chamber for selective rotation between valve open and valve closed positions to control flow through the valve assembly. The valve assembly, according to this aspect, includes a linear actuation member slideable to engage proximate the ball/bore interface to assist in moving the ball valve member to the valve closed position.

Abstract: A variable flow area injector for a liquid rocket engine. The injector has a poppet with a variable outer width portion and a housing with a variable inner width portion. An annular flow path is defined between the variable width portions. Increased throttling of the engine passively increases the annular flow area of the injector by forcing the poppet in a distal direction. Decreased throttling allows a restoring spring to move the poppet in a proximal direction to decrease the annular flow area. A bellows can be included to dampen movement of the poppet. The bellows may be in a propellant-filled cavity separate from the main propellant flow path and have a series of openings through which the separate propellant flows.

Abstract: A pressure control valve for a downhole drilling system includes a choke body and a restrictor body. The choke body is installed in the bore of a housing. A fluid flow flows through an orifice in the choke body. Changing a distance between the choke body and the restrictor body changes a pressure differential uphole of the pressure control valve.

Abstract: A pneumatic valve control device includes an air cylinder. The air cylinder includes a first piston; an air outlet; and a locking and releasing mechanism configured to lock and release the first piston when the first piston is pushed up. The device also includes a hydraulic cylinder. The hydraulic cylinder includes a second piston; an air vent disposed on a first side of the second piston; and a liquid inlet and a liquid outlet disposed on a second side of the second piston. The device also includes a partition disposed between the hydraulic cylinder and the air cylinder; a partition channel disposed on the partition; a piston rod connected to the second piston and configured to pass through the partition channel; and a tappet valve connected to the piston rod and configured to leave the partition channel in response to an upward movement of the piston rod.

Abstract: A downhole valve is described. The downhole valve has a pilot valve section and a tool section. The pilot valve section has a first tube. The tool section has a second tube slidably coupled to the first tube of the pilot valve section so as to provide fluid communication between the pilot valve section and the tool section. The tool section can be in the form of a signal valve section of a mud pulse telemetry valve, a reamer, a vertical steerable tool, a rotary steerable tool, a by-pass valve, a packer, a whipstock, or stabilizer.

Abstract: A downhole valve includes a housing, and a sleeve positioned within the housing. The sleeve has a first axial end, a second axial end, and a seat positioned between the first and second ends. The sleeve defines an opening facing in a radial direction. The sleeve prevents fluid flow in an opposite radial direction, away from the opening. The valve also includes a retaining element coupled to or integral with the sleeve, and a first obstructing member positioned in the sleeve and movable between the seat and the retaining element. In a first position, the first obstructing member engages the seat and prevents fluid flow through the housing. In a second position, the first obstructing member is separated apart from the seat such that at least a portion of the opening is axially between the first obstructing member and the first obstructing member.

Abstract: An apparatus for use in marine platform jacking is disclosed herein. In one aspect, a jetting valve includes a valve body with a piston assembly disposed therein. The piston assembly is selectively operated to open and close the valve. A biasing member is coupled to the piston assembly. The piston assembly includes a first piston and a second piston. The dual pistons, in cooperation with the biasing member, allow the valve to self-seal thereby preventing entry of a fluid which is external to the valve.

Abstract: A wellbore assembly includes a drill string and a drill bit in fluid communication with the drill string. The drill bit has a tubular wall, an internal fluid channel, a tapered tube, and a spring. The fluid channel receives and flows the drilling fluid from the drill bit bore and out the drill bit. The fluid channel includes an inwardly projecting shoulder. The tapered tube is disposed inside the fluid channel. The tube has a rim and a wall extending from and converging away from the rim in a flow direction of the drilling fluid. The spring is disposed between the inwardly projecting shoulder and the rim. The tapered tube is movable under fluidic pressure in the flow direction to compress or extend the spring. The tube pushes an obstruction in the fluid channel out of the fluid channel upon movement of the tube.

Abstract: An expiratory valve (10) of a ventilation device (100), including a valve body (12) having a fluid inlet (14) and a fluid outlet (16) for breathing air of a patient formed therein the valve body (12) defining a fluid flow path between fluid inlet (14) and fluid outlet (16), with the cross-sectional area of the fluid flow path expanding in the direction towards the fluid outlet (16).

Abstract: A valve device can be compact, low cost and has a bleed function. A valve body defines an accommodation recess which opens at a surface of the valve body and contains a valve element therein, a primary flow path and a secondary flow path connected to the accommodation recess, the valve element having a sealing portion for blocking direct communication between the primary flow path and the secondary flow path through the accommodation recess, a detour passage for making the primary flow path and the secondary flow path communicate through the valve element, and a bleed hole for making the detour passage and the secondary flow path communicate through the accommodation recess.

Abstract: Downhole apparatus (30) comprises: a tubular body (42) for incorporation in a tubing string (24); a float valve (30) mounted in the body (42) and operable to prevent flow up though the body; and a float valve retainer (38) maintaining the float valve (30) in an inoperable configuration and permitting flow up through the body (42), the retainer (38) comprising a flow restriction (80) to permit creation of a pressure differential across the restriction (80) and reconfiguring of the retainer (38) to permit operation of the float valve (30). The flow restriction (80) has a retracted configuration and an extended configuration to permit creation of the pressure differential, the flow restriction (80) maintaining the retracted configuration until exposed to a selected absolute pressure.

Abstract: A reverse cementing tool has an outer case connected in a casing string. A dual stage actuating sleeve is disposed in the outer case and is operable in a first stage actuation to open a cement flow path from a well annulus to a central flow passage of the reverse cementing tool. In a second stage actuation the cement flow path is closed. The actuating sleeve includes inner and outer sleeves in the outer case. The inner and outer sleeves move in opposite directions in the outer case to first open, and then close the cement flow path.

Abstract: A check valve, including a valve and a valve support surface, to permit a fluid to move through the check valve in a first direction and resist a fluid flow through the valve in a second direction, the valve having a valve diaphragm and an isolating bridge, with a portion of the valve engaging against valve support surface to resist deformation or stretching of the valve when a backflow of fluid into the check valve occurs. The valve support surface having a first support surface and a second support surface, and the valve positioned with the valve diaphragm spaced apart from the first support surface, and the isolating bridge spaced apart from the second support surface.

Abstract: A subsurface safety valve for controlling fluid flow in a well conduit incorporating a pressure equalizing feature. The safety valve includes a body member having a longitudinal bore, a valve actuator having axial movement within the longitudinal bore and a valve that restricts flow through the longitudinal bore. An equalization fluid flow passageway provides a fluid path between the longitudinal bore above the valve and the longitudinal bore below the valve. An equalizing device is located within the equalization fluid flow passageway and configured to resist sand and debris effects on its operation, the equalizing device regulating flow through the equalization fluid flow passageway and operated by the valve actuator prior to opening the valve.

Abstract: A flow control device including a first channel, a second channel, and a diaphragm positioned between the first channel and the second channel, wherein the diaphragm includes a first side and a second side that faces an opposite direction as the first side. The diaphragm is configured and arranged to alternatively operate in both: a closed condition in which flow from the first channel to the second channel is impeded, and an open condition in which flow from the first channel to the second channel occurs. The diaphragm is also configured and arranged to change from the closed condition to the open condition when a force of a positive fluid flow through the first channel towards the first side of the diaphragm exceeds a combination of a gravitational force and a force of atmospheric pressure upon the second side of the diaphragm.

Abstract: An expiratory valve (10) of a ventilation device (100) is provided, including a valve body (12) having a fluid inlet (14) and a fluid outlet (16) for breathing air of a patient formed therein. The valve body (12) has at least one reinforcing rib (36, 38) formed around the fluid inlet (14).

Abstract: A water control device includes a valve, the valve including a valve body, the valve body including a first end and a second end, the valve body defining a transmission cavity allowing fluid communication between the first end and the second; a control mechanism located within the transmission cavity, the control mechanism arranged to provide modifiable fluid control within the valve; at least one sensor, the at least one sensor being in fluid communication with the transmission cavity; and at least one remote transmission unit in electronic communication with the sensor.

Abstract: A playground water feature including a feature outlet. The playground water feature also including a diaphragm valve configured to receive water flow from a water source. The playground water feature also including a mechanical activator, configured to, when actuated, open a vent valve, that is fluidically coupled to the diaphragm valve, such that the diaphragm valve opens to allow the water flow to flow to the feature outlet.

Abstract: A medical device is provided comprising a first port; a second port in fluid communication with the first port; and a third port in selective fluid communication with both the first port and the second port; a sealing membrane disposed between the third port and both the first port and the second port, the sealing membrane is configured to move between a first position preventing fluid communication between the third port and both the first port and the second port and a second position allowing fluid communication between the third port and the first port, wherein movement of a fluid supplied to the medical device at the third port moves the sealing membrane from the first position to the second position.

Abstract: A pressure equalization valve assembly may include a valve body forming fluid chamber configured to receive pressurized fluid from a fluid pressure source, a first port configured for sealed communication with a first vehicle tire, and a second port configured for sealed communication with a second vehicle tire; a first one-way valve disposed in the valve body between the fluid chamber and the first port so as to allow one-way fluid communication from the fluid chamber to the first port when the first one-way valve opens; a second one-way valve disposed in the valve body between the fluid chamber and the second port so as to allow one-way fluid communication from the fluid chamber to the second port when the second one-way valve opens; and a two-way valve disposed in the valve body between the first port and the second port so as to allow two-way fluid communication between the first port and the second port when the two-way valve opens.

Abstract: A flow diverter for connecting a central bore to an outer conduit. The flow diverter defines a portion of the central bore and angled flow passages connecting the portion of the central bore to the outer conduit. Rounded edges between the central bore and angled flow passages reduce cavitation and/or turbulence. The rounded edges and an adjacent portion of the central bore may be defined by an insert.

Abstract: A technique facilitates injection via an injector well while providing automatic restriction of unwanted back flow. A completion positioned in a borehole facilitates the injection operation. The completion includes a packer coupled with a tubing and oriented to enable formation of a seal between the tubing and a surrounding casing. A formation isolation valve is coupled to the tubing. Additionally, a mechanical assembly is coupled to the tubing at, for example, a location below the formation isolation valve. The mechanical assembly may include a mechanical formation isolation valve and a flow controller. The flow controller is automatically actuatable to enable a flow of injection fluid in a downhole direction while blocking fluid flow in an uphole direction while the mechanical formation isolation valve is in a closed position. The flow controller includes a plurality of flow restrictors positioned to control flow between an interior and an exterior of the tubing.

Abstract: An apparatus, system, and method of use that enables control of fluid flow in a wellbore drill string with a pilot. The apparatus comprises a pusher rod with a bore for fluid flow contacting a rotatable ball with an internal bore comprising at least one pilot, wherein the seat between the pusher rod and the interior of the tubular prevents fluid flow. Pressure changes on the pusher rod rotate the bore of the ball in and out of contact with the bore of the pusher rod, to enable or prevent fluid flow, respectively. A method of use opens the ball by exerting pressure and/or force on the pusher rod to enable fluid through the ball by aligning the internal bores. Fluid flow is stopped by pressure exerted on the bottom of the ball causing the ball to rotate whereby the internal bore of the pusher rod is connected to the exterior surface of the ball. An accumulator can control the operations of the valve by selectively exerting pressure and/or fluid flow on the pusher rod.

Abstract: Animal drinking troughs have pressure reducers for reducing the higher pressure of the liquid supply to a low liquid pressure for supplying the animal drinking troughs. For various reasons, it is desired to change the reduced pressure. This takes place by adjustment of the pressure reducers. It is known to undertake such an adjustment with compressed air. This requires a separate compressed air source and a corresponding pipe system. The invention makes provision to adjust the pressure reducer hydraulically by means of the higher pressure of the liquid of the liquid supply. The energy required for adjusting the pressure reducers thereby provides the liquid pressure of the liquid supply. As a result, the pressure reducers according to the invention operate autonomously. A separate energy source for adjusting the pressure reducers is not required.

Abstract: An object of the present invention is to provide a tensioner capable of keeping the oil pressure in an oil pressure chamber stable in a favorable manner. Provided is a tensioner wherein a relief mechanism includes a partition part, a valve member at least partly positioned inside an internal relief hole such as to be able to approach and separate from an oil pressure chamber, a valve biasing unit, and an external relief hole. A movement restricting part that restricts movement of the valve member toward the oil pressure chamber is formed in the partition part. An oil passing groove is formed in at least one of an outer circumferential surface of the valve member and an inner circumferential surface of the internal relief hole, the outer circumferential surface and the inner circumferential surface facing each other.

Abstract: A check valve system includes a housing, a blocking element, and a biasing member. The housing has a passageway therethrough, the passageway including a first portion and a second portion, the first portion having a diameter that is less than a diameter of the second portion so as to form a stepped portion. The blocking element is disposed within the second portion of the passageway. The biasing member is disposed within the second portion of the passageway and configured to maintain the blocking element in contact with the stepped portion when under compression. The housing, the blocking element and the biasing member being obtainable by substantially simultaneously 3D printing, so as to be formed from one or more 3D printable materials.

Abstract: A valve for subterranean whipstock service has a side port and a through passage with a biased movable sleeve to shift between circulation mode into the annulus and flow through mode for setting an anchor and then feeding window mill nozzles. The valve is run in when in circulation mode to allow operation of a measurement while drilling device. When the whipstock is properly oriented the pressure is increased to break a shear pin to allow a spring to bias the sleeve to the flow through position. The shifting of the sleeve opens a bypass passage around the restriction orifice that was first used to build pressure to break the shear pins that let the sleeve move under spring bias. As a result the spring can hold the sleeve in position despite high flow rates needed to remove cuttings from the mill as the window is opened.

Abstract: A method and apparatus for controlling the flow of fluid in an injection well includes a main valve assembly having a valve and a retrievable nozzle selective lock assembly (RNSLA). The RNSLA is operable when positioned within the valve body to open the valve when fluid is pumped into the well and closes the valve when fluid flow is terminated. The RNSLA includes a replaceable orifice nozzle so that orifices of different dimensions may be used in conjunction with the valve assembly. In an alternate embodiment, the RNSLA includes a variable output nozzle assembly to maintain the valve in a protected open position without chattering over a wide range of flow rates.

Abstract: The present disclosure provides a ureteral stent, having an elongated tube configured to be inserted into a ureter; a first end having a retainer portion configured to be inserted into a kidney; and a second end configured to be inserted into a bladder, the second end having an anchor portion fluidicly coupled with the first end, the second end having a collapsible wall expandable to a cross-sectional size greater than the cross-sectional size of the ureter; a tube port fluidicly coupled with the first end; and a flapper valve having at least two valve ends coupled to the anchor portion over the port; and a flexible middle portion between the at least two valve ends configured to flex toward the port to cover the port with a predetermined amount of ambient pressure in the bladder and flex away from the port when ambient pressure is lower than the predetermined amount.

Abstract: A method and apparatus for filling an annulus between a wellbore and a casing string with cement are provided. A baffle is arranged between a port on a side of the casing string and an interior volume of the casing string. The baffle includes orifices arranged there around that distribute the flow of cement about the circumference. After the cement has been pumped, a sealing sleeve is moved over the baffle and the port and forms a metal-to-metal seal that isolates the baffle and the port from the interior volume of the casing string.

Abstract: The invention disclosed herein comprises a system focusing water current into a relatively smaller diameter lumen, imparting vortical movement to the current, and directing the water vortex through an even smaller diameter lumen en route to turbine blades having long curved blades rotatable along an axis parallel with the lumen. Rotation of the turbine blades turns gearing interfacing with the circumference of the turbine assembly, to rotate a drive shaft connected to a generator.

Abstract: A safety valve system for use in a subterranean well can include a safety valve protector connected downstream of a safety valve, whereby when closed the safety valve protector reduces a flow rate through the safety valve and prevents displacement of an object through the safety valve protector to the safety valve. Another safety valve system can include a safety valve protector which, when closed, reduces a flow rate through a safety valve, and the safety valve protector closes in response to the flow rate through the safety valve being above a predetermined level. In another safety valve system, each of the safety valve protector and the safety valve comprises an actuator, the actuators being connected by a line, and a signal transmitted by the line causes the safety valve protector actuator to close the safety valve protector, and then causes the safety valve actuator to close the safety valve.

Abstract: An apparatus, system, and method of use enable control of fluid flow in a wellbore tubular. The apparatus comprises a pusher rod with a bore for fluid flow contacting a rotatable ball with an internal bore comprising at least one pilot, wherein the seat between the pusher rod and the interior of the tubular prevents fluid flow. Pressure changes on the pusher rod rotate the bore of the ball in and out of contact with the bore of the pusher rod, to enable or prevent fluid flow, respectively. A method of use opens the ball by exerting pressure and/or force on the pusher rod to enable fluid through the ball by aligning the internal bores. Fluid flow is stopped by pressure exerted on the bottom of the ball causing the ball to rotate whereby the internal bore of the pusher rod is connected to the exterior surface of the ball.

Abstract: An apparatus, system, and method of use that enables control of fluid flow in a wellbore drill string with a pilot. The apparatus comprises a pusher rod with a bore for fluid flow contacting a rotatable ball with an internal bore comprising at least one pilot, wherein the seat between the pusher rod and the interior of the tubular prevents fluid flow. Pressure changes on the pusher rod rotate the bore of the ball in and out of contact with the bore of the pusher rod, to enable or prevent fluid flow, respectively. A method of use opens the ball by exerting pressure and/or force on the pusher rod to enable fluid through the ball by aligning the internal bores. Fluid flow is stopped by pressure exerted on the bottom of the ball causing the ball to rotate whereby the internal bore of the pusher rod is connected to the exterior surface of the ball. An accumulator can control the operations of the valve by selectively exerting pressure and/or fluid flow on the pusher rod.

Abstract: A system allows for collection and re-use of a fluid medium derived from diverting at least some of the fluid medium of an injection. The system comprises a sterile container, an injector, a delivery catheter, a flow diverter assembly and a diversion reservoir assembly. The delivery catheter is in communication with a selected site within a patient's body. The flow diverter assembly is disposed in a flow path between the injector and the delivery catheter and is configured to divert at least a portion of a medium of the injection from the flow path. The diversion reservoir assembly has a reservoir chamber fluidly coupled to the flow diverter assembly. The reservoir chamber is configured to receive the diverted portion of the fluid medium to allow re-use by the medium injector of the diverted portion.

Abstract: Actuation mechanisms for downhole assemblies in earth-boring applications may comprise a housing comprising an internal bore defining a flow path through the housing. An actuation member may be supported within the housing. A movable sleeve may be located within the internal bore and may be movable between a first position and a second position responsive to changes in flow rate of fluid flowing through the flow path. The movable sleeve may be biased toward the first position. The actuation member may be in an initial, pre-actuation position when the movable sleeve is initially located in the first position. The actuation member may be movable to a subsequent, pre-actuation position when the movable sleeve is located in the second position. The actuation member may be released from the actuation mechanism when the movable sleeve is returned to the first position.

Abstract: A flow control valve includes a housing defining a cavity therein. The housing has an input port for receiving a gas from a gas supply, and an output port for delivering the gas to a gas cylinder. The cavity defines a staging area fluidly connected to the input port, a delivery area fluidly connected to the output port, and a pressurization area fluidly connected to a feedback sensing port. The feedback sensing port is configured to receive pressurized fluid that is pressurized to a pressure level representative of a pressure level of gas delivered to the gas cylinder. The flow control valve includes a piston slidably positioned in a channel extending between the pressurization area and the delivery area. The position of the piston changes a rate of flow of gas through the flow control valve. The piston position moves in response to a pressure at the feedback sensing port.

Abstract: A medical device is provided comprising a first port; a second port in fluid communication with the first port; and a third port in selective fluid communication with both the first port and the second port; a sealing membrane disposed between the third port and both the first port and the second port, the sealing membrane is configured to move between a first position preventing fluid communication between the third port and both the first port and the second port and a second position allowing fluid communication between the third port and the first port, wherein movement of a fluid supplied to the medical device at the third port moves the sealing membrane from the first position to the second position.

Abstract: A downhole tool has a housing, mandrel, and ball seat. The housing defines a first bore, and the mandrel defines a second bore. The mandrel is disposed in the first bore of the housing and defines an annular space with the housing. The ball seat is rotatably disposed in the second bore of the mandrel and defines an interior passage with a seat profile. First and second pistons are disposed in the annular space on opposing sides of the ball seat. These first and second pistons are movable along an axis of the tool in the annular space in opposing directions and are adapted to rotate the ball seat. Additionally, first and second biasing members are disposed in the annular space and bias the first and second pistons toward one another to reset the ball seat in the absence of pressure.

Abstract: An ORVR valve assembly operative of relatively few movable components includes a valve body, having conduits to provide for routine passage of vapors therethrough through operations of a vacuum assist system. This is when a non-ORVR vehicle is being replenished with fuel. But, when a vehicle equipped with ORVR vapor recovery is being fueled, vacuum is generated above a piston supported diaphragm, attracts the diaphragm upwardly, plugs off the vapor passage conduits, and allows the ORVR system of the automobile to exclusively treat the generated vapors at the location of the vehicle and its fuel tank. Simultaneously, air is vented into the valve body, below its diaphragm, and into the vapor return line of the vacuum assist system, to prevent it from being subject to excessive vacuuming.

Abstract: A safety valve system for downhole use in a wellbore comprises a safety valve comprising a sealable flow path; an annulus safety valve configured to provide fluid communication between a central flow path and an annular flow path; a landing nipple, wherein the landing nipple comprises ports configured to provide fluid communication between the annular flow path and the central flow path; and a cable passing through the sealable flow path, wherein the cable comprises a sealing mechanism and latch mechanism configured to engage the landing nipple.

Abstract: A MEMS check valve includes a supporting portion having a first perforation therethrough sized to permit fluid flow and includes a displaceable portion having a second perforation therethrough sized to permit fluid flow. The displaceable portion may be moveable relative to the supporting portion between a closed position inhibiting fluid flow through the valve and an open position permitting fluid flow through the valve. The first and second perforations are offset to inhibit fluid flow when the displaceable portion is in the first position, and fluid may flow through the first and second perforations when the displaceable portion is in the second position.

Abstract: A microfluidic valve for implantation in an eye of a patient is disclosed. The valve may include a chamber formed between a substrate and a flexible membrane. The valve may also include a boss disposed in the chamber and having a top edge in selective contact with the flexible membrane. The top edge includes a relief portion and a non-relief portion, with the relief portion being structurally arranged so that a pressure required to separate the membrane from the relief portion is less than a pressure required to separate the membrane from the non-relief portion. The valve also may include an inlet extending through the boss and the substrate through which fluid enters the chamber and an outlet configured to allow fluid to exit the chamber. Methods for priming a microfluidic valve are also disclosed.

Abstract: The invention provides a flow control valve for a subsea hydrocarbon production system and a method of use. The flow control valve comprises an inlet configured to be in fluid communication to an injection fluid conduit and an outlet configured to be in fluid communication with a subsea flow system. A flow control mechanism is disposed in a flow path between the inlet and the outlet and is arranged to adjust a flow rate through the flow path. The flow control mechanism is configured to automatically adjust the flow rate of injection fluid through the flow path according to a pressure differential between fluid pressure at the inlet and fluid pressure at the outlet. Adjustment may be self-regulating, or may be controlled by a hydraulic control circuit.

Abstract: A method and apparatus for controlling the flow of fluid in an injection well includes a main valve assembly having a valve and a retrievable nozzle selective lock assembly (RNSLA). The RNSLA is operable when positioned within the valve body to open the valve when fluid is pumped into the well and closes the valve when fluid flow is terminated. The RNSLA includes a replaceable orifice nozzle so that orifices of different dimensions may be used in conjunction with the valve assembly. In an alternate embodiment, the RNSLA includes a variable output nozzle assembly to maintain the valve in a protected open position without chattering over a wide range of flow rates.

Abstract: A wireline retrievable injection valve for an oil or gas well has an internal valve that is initially moved to open a flapper safety valve and also opens to allow fluid flow through the valve. The internal valve includes a sleeve that opens the flapper safety valve and shields the flapper safety valve from fluid. In this manner the flapper valve is protected from being caused to “flutter” or “chatter” due to pressure variations in the fluid flow, thereby damaging the seat.

Abstract: A catheter assembly incorporating a pre-biased indicator, the assembly includes a catheter having a proximal end, a distal end, and catheter walls defining a catheter lumen. The assembly further includes a base located at the proximal end of the catheter, the base defining an opening to the catheter lumen, the base having a first end and a second end. An inflatable balloon having a predetermined fill volume is located at a distal end of the catheter. An inflation valve is located on the base; the inflation valve is in fluid communication with the balloon through an inflation lumen defined by the catheter walls. The pre-biased indicator located on the base in fluid communication with the balloon is configured to provide a discrete visual signal that the pressure of a fluid in the balloon is different from a predetermined level of pressure or the volume of the balloon is different from the predetermined fill volume.