Flow control valve, assembly method and hydraulic system

Abstract

The present invention relates to flow control valves, assembly methods, and hydraulic systems. An example valve includes a housing, a sleeve disposed within the housing and having a first end and a second end opposite the first end, and the sleeve includes a plurality of sleeve projections at the first end, and a plurality of fluid flow passages are formed between adjacent sleeve projections, a seal carrier disposed within the sleeve and having a carrier projection extending from the second end of the sleeve and abutting an inner surface of the housing, and an end cap mounted to the housing such that the plurality of sleeve projections abut the end cap.

Description

Technical Field

[0001] This disclosure generally relates to a flow control valve with a multi-functional sleeve, and more specifically to a flow control valve that controls the fluid flow rate to an actuator to move the actuator in a controlled manner. Background Technology

[0002] Flow control valves guide the flow of a liquid medium, typically oil, via a hydraulic system and control the fluid flow rate supplied to the actuator. Example valves have a movable element, such as a spool, inside a housing or sleeve, and based on the movement of the spool within the sleeve, open and close a transverse orifice defined on the sleeve to achieve the desired flow rate. Summary of the Invention

[0003] This disclosure describes examples involving flow control valves, assembly methods, and hydraulic systems.

[0004] In one aspect, this disclosure describes a flow control valve. The flow control valve includes a housing and a sleeve disposed within the housing. The sleeve has a first end and a second end opposite to the first end. The sleeve includes a plurality of sleeve protrusions at the first end, and a plurality of fluid flow channels are formed between adjacent sleeve protrusions. The flow control valve also includes a sealing carrier disposed within the sleeve. The sealing carrier includes a carrier protrusion extending from the second end of the sleeve and abutting against an inner surface of the housing. The flow control valve also includes an end cap mounted to the housing such that the plurality of sleeve protrusions abut against the end cap.

[0005] In another aspect, this disclosure describes a hydraulic system. The hydraulic system includes a cylinder having a chamber and a flow control valve fluidly coupled to and configured to control fluid flow to and from the chamber. The flow control valve includes a housing and a sleeve disposed within the housing. The sleeve has a first end and a second end opposite to the first end. The sleeve includes a plurality of sleeve protrusions at the first end, and a plurality of fluid flow channels are formed between adjacent sleeve protrusions. The flow control valve also includes a sealing carrier disposed within the sleeve. The sealing carrier includes a carrier protrusion extending from the second end of the sleeve and abutting against an inner surface of the housing. The flow control valve also includes an end cap mounted to the housing such that the plurality of sleeve protrusions abut against the end cap.

[0006] In another aspect, this disclosure describes a method of assembling a flow control valve. The method includes positioning a sleeve within a housing. The sleeve has a first end and a second end opposite to the first end, and the sleeve includes a plurality of sleeve protrusions at the first end, and a plurality of fluid flow channels are formed between adjacent sleeve protrusions. The method also includes positioning a sealing carrier within the sleeve. The sealing carrier includes a carrier protrusion extending from the second end of the sleeve and abutting against an inner surface of the housing. The method further includes mounting an end cap to the housing such that the plurality of sleeve protrusions abut against the end cap.

[0007] The foregoing description of the invention is merely illustrative and is not intended to be limiting in any way. Further aspects, examples, and features, in addition to the illustrative aspects, examples, and features described above, will become apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0008] The appended claims set forth novel features that are considered exemplary examples. However, the illustrative examples, preferred modes of use, further purposes, and description thereof will be best understood when read in conjunction with the accompanying drawings and by referring to the following detailed description of the illustrative examples of this disclosure.

[0009] Figure 1 An aircraft with a three-wheeled landing gear configuration is shown according to an example implementation.

[0010] Figure 2 A schematic representation of a hydraulic system configured to control the main landing gear of an aircraft is shown according to an example embodiment.

[0011] Figure 3 An example implementation is shown. Figure 2 A schematic representation of a hydraulic system, where arrows indicate the direction of fluid flow in another operating mode.

[0012] Figure 4 A perspective view of a flow control valve is shown according to an example embodiment.

[0013] Figure 5 An example implementation is shown. Figure 4 A cross-sectional view of the flow control valve.

[0014] Figure 6 An example implementation is shown. Figures 4 to 5 A perspective cross-sectional view of the flow control valve.

[0015] Figure 7 A perspective view of the sleeve is shown according to an example embodiment.

[0016] Figure 8 An example implementation is shown. Figure 7 A cross-sectional view of the sleeve.

[0017] Figure 9 This is a flowchart of a method for assembling a flow control valve according to an example embodiment. Detailed Implementation

[0018] Within this example, this document discloses a flow control valve with a multi-functional sleeve, a hydraulic system, and a method for assembling the flow control valve. The sleeve is disposed within the housing of the flow control valve, and a spool is configured to be slidably received within the sleeve. Based on the movement of the spool within the sleeve, a transverse orifice defined by the interaction between the spool and the sleeve is opened and closed to achieve a desired flow rate.

[0019] The sleeve is configured to allow fluid flow through a fluid flow channel formed within it. The sleeve also has a slot or cavity to retain the orifice plug, instead of using a separate lock nut and orifice plate. This eliminates the need for additional components, integrating their features into the sleeve. Therefore, compared to conventional valves, this valve can have a reduced number of parts, and consequently, reduced weight and cost.

[0020] Furthermore, the orifice plug integrated with the sleeve can function as a safety feature, allowing a specific amount of fluid flow (e.g., at least a minimum flow) through it when components operate undesirably, blocking the transverse orifice. Therefore, the valve is able to operate the actuator in an application despite accidental operation of some components. By providing a minimum fluid flow through it when components operate unexpectedly, these valves enable the actuator to move to a safe position in certain applications. An example application where the valve can be used is a hydraulic system configured to control the operation of an aircraft's main landing gear. However, it should be understood that the flow control valves disclosed herein can be used with other types of actuators and applications.

[0021] Figure 1 An aircraft 100 with a three-wheeled landing gear configuration is shown according to an example embodiment. The three-wheeled landing gear configuration includes a type of aircraft landing gear in which a single nose wheel is positioned at the front of the aircraft 100, and two main wheels are positioned slightly aft of the aircraft 100's center of gravity. For example, the aircraft 100 has a nose landing gear 102 with wheels at the front. The aircraft 100 also has two main landing gears, main landing gear 104 and main landing gear 106, wherein the associated wheels are slightly aft of the aircraft 100's center of gravity.

[0022] For example, the main landing gear 104 includes actuators, such as actuator 216. Figure 2As shown in the illustration, the actuator has a piston that is axially movable within a cylinder and configured to deploy the wheels during landing and retract the wheels into the wheel wells after takeoff of the aircraft 100. In this example, the piston moves at a specific desired speed by controlling the amount of fluid flow supplied to the actuator, and the actuator is operated in a controlled manner to safely operate and deploy or retract the main landing gear 104. The main landing gear 106 is configured in a similar manner. The example hydraulic system described below is configured to control the actuators of the main landing gear, such as the main landing gear 104 or the main landing gear 106.

[0023] Figure 2 A schematic representation of a hydraulic system 200 configured to control the main landing gear of an aircraft is shown according to an example embodiment. For example, the hydraulic system 200 controls the main landing gear 104 or main landing gear 106 of the aircraft 100.

[0024] The hydraulic system 200 includes a cylinder (e.g., cylinder 222 described below) having a chamber (e.g., chamber 230 described below). The hydraulic system 200 also includes a flow control valve (e.g., flow control valve 214) fluidly coupled to the chamber of the cylinder and configured to control fluid flow to and from the chamber.

[0025] The following text is relative to Figures 4 to 8 An example configuration of the flow control valve 214 is described. In this example, the hydraulic system 200 includes other components as described below.

[0026] Hydraulic system 200 receives pressurized fluid 201 from a landing gear delivery valve fluidly connected to a fluid source (e.g., a pump, accumulator, or other valve from a different part of the aircraft's hydraulic circuit). The pressurized fluid 201 is then supplied to inlet fluid line 202. Hydraulic system 200 supplies return fluid flow to the landing gear delivery valve via return fluid line 204, which then supplies return fluid to a fluid reservoir or a different part of the aircraft's hydraulic circuit.

[0027] The hydraulic system 200 includes a landing gear selector valve 206 fluidly connected to an inlet fluid line 202 and a return fluid line 204. In this example, the landing gear selector valve 206 is configured as a directional control valve.

[0028] As an example, the landing gear selector valve 206 is actuable via an electric actuator (e.g., a solenoid actuator), a fluid actuator, or a mechanical actuator. For instance, the landing gear selector valve 206 has a spool within its valve body, and based on an actuation signal to the landing gear selector valve 206 (e.g., an actuation signal for one of the two solenoids of a solenoid actuator), the spool is movable in a first linear direction or a second direction opposite to the first direction. Based on the direction of movement of the spool, the landing gear selector valve 206 supplies pressurized fluid to fluid line 208 while receiving return fluid via fluid line 210, or the landing gear selector valve 206 supplies pressurized fluid to fluid line 210 while receiving return fluid via fluid line 208.

[0029] Fluid line 208 can be referred to as a downpressure fluid line, while fluid line 210 can be referred to as an uppressure fluid line. "Downpressure" refers to the fluid line receiving pressurized fluid when the main landing gear deploys (moving downwards from the wheel wells in preparation for landing), while "uppressure" refers to the fluid line receiving pressurized fluid when the main landing gear retracts (moving upwards towards the wheel wells after takeoff). Figure 2 The key indicates that fluid lines with circles represent fluid lines involved in retracting the main landing gear, and fluid lines with crosshairs represent fluid lines involved in deploying the main landing gear.

[0030] Hydraulic system 200 includes a volumetric fuse 212. The volumetric fuse 212 is configured to allow a specific volume of fluid to pass through it in a single operating cycle. If such a volume of fluid is exceeded, the volumetric fuse 212 cuts off the fluid flow. In this example, as described below, the volumetric fuse 212 protects hydraulic system 200 from line rupture within hydraulic system 200 and resets after each operating cycle when less than a predetermined volume of fluid flows through it.

[0031] The hydraulic system 200 also includes a flow control valve 214, which may be referred to as a flow regulator, configured to control the flow rate of fluid supplied to and discharged from the main landing gear actuator 216. The flow control valve 214 is fluidly connected to a delivery cylinder 218 and a fragile component 220. As described below, the fragile component 220 operates with a volumetric fuse 212 to provide safety protection for the hydraulic system 200, and the delivery cylinder 218 is configured as a time-delay element to allow the locking mechanism of the main landing gear to release before the main landing gear is deployed or retracted.

[0032] The main landing gear actuator 216 includes a cylinder 222 and a piston 224 slidably housed within the cylinder 222. The term “slidably housed” is used herein to indicate that a first component (e.g., piston 224) is positioned relative to a second component (e.g., cylinder 222) such that the first component is movable relative to the second component.

[0033] The piston 224 includes a piston head 226 and a piston rod 228 extending from the piston head 226 along the central longitudinal axis of the cylinder 222. The piston head 226 divides the interior or internal space of the cylinder 222 into a chamber 230 and a chamber 232. The chamber 230 may be referred to as the cover chamber or head chamber, while the chamber 232 may be referred to as the rod chamber.

[0034] The piston rod 228 is configured to be coupled to the main landing gear. For example, the end of the piston rod 228 is configured to be coupled to a strut or other mechanism that is coupled to the wheel assembly of the main landing gear. The main landing gear actuator 216 is configured such that when the piston 224 extends (e.g., moves to...),... Figure 2 When the piston 224 retracts (e.g., moves to the left side of the wheel well), the main landing gear and wheels retract or return to the wheel wells after takeoff. On the other hand, when piston 224 retracts (e.g., moves to the left side of the wheel well), the main landing gear and wheels retract or return to the wheel wells after takeoff. Figure 2 When the main landing gear and wheels deploy from the wheel wells (on the right side of the landing gear), they prepare for landing.

[0035] As described above, the main landing gear has a locking mechanism that releases before allowing the main landing gear to retract or deploy. The locking mechanism is coupled to and can be released by both the lowering actuator 234 and the upper actuator 236. For example, when the main landing gear is deployed, the lowering actuator 234 locks the main landing gear in place. Then, before retracting the main landing gear, the lowering actuator 234 is actuated to release the locking mechanism. Alternatively, when the main landing gear is retracted in the wheel well, the upper actuator 236 locks the main landing gear in place. Then, before deploying the main landing gear, the upper actuator 236 is actuated to release the locking mechanism.

[0036] The locking actuator 234 and locking actuator 236 are generally configured similarly to the main landing gear actuator 216. The locking actuator 234 includes a cylinder 238 and a piston 240 slidably housed within the cylinder 238. The piston 240 includes a piston head 242 and a piston rod 244 extending from the piston head 242 along the central longitudinal axis of the cylinder 238. The piston head 242 divides the internal space of the cylinder 238 into chambers 246 and 248.

[0037] Similarly, the locking actuator 236 includes a cylinder 250 and a piston 252 slidably housed within the cylinder 250. The piston 252 includes a piston head 254 and a piston rod 256 extending from the piston head 254 along the central longitudinal axis of the cylinder 250. The piston head 254 divides the internal space of the cylinder 250 into chambers 257 and 258.

[0038] Hydraulic system 200 also includes other components. For example, hydraulic system 200 includes several flow restrictor check valves, including flow restrictor check valve 260, flow restrictor check valve 262, and flow restrictor check valve 264. The flow restrictor check valves are configured to allow free fluid flow (e.g., with minimal pressure drop) in one direction (in the direction of the arrow shown in the symbol of the flow restrictor check valve) while restricting fluid flow in another direction (wherein the flow restrictor is shown in the symbol of the flow restrictor check valve).

[0039] The hydraulic system 200 may further include a safety valve to release pressurized fluid when the pressure level in a particular chamber or fluid line exceeds a certain threshold pressure value. For example, the hydraulic system 200 includes a safety valve 266 configured to open and provide a fluid path for fluid in the chamber 246 of the locking actuator 234 if the pressure level of the fluid therein exceeds the threshold.

[0040] The hydraulic system 200, in conjunction with the piston 224 of the extended main landing gear actuator 216 (e.g., moves the piston 224 to...), Figure 2 Operable in the first operating mode associated with the left side of the image (as shown in the image), this corresponds to retracting the main landing gear into the wheel wells after takeoff. The hydraulic system 200 is activated by the piston 224 of the main landing gear retraction actuator 216 (e.g., moving the piston 224 to...). Figure 2 The second operating mode associated with the right side of the diagram is operable, which corresponds to deploying the main landing gear from the wheel wells to prepare for landing the aircraft.

[0041] Hydraulic system 200 Figure 2 An arrow is used to indicate the direction of fluid flow in the first operating mode. In this first operating mode, the landing gear selector valve 206 supplies fluid flow to the fluid line 210. In this example, the fluid line 210 is fluidly connected to the alternative braking system 268 via the fluid line 270, such as... Figure 2 As shown in the diagram, the alternative braking system 268 is configured to activate when the aircraft's normal braking system fails and / or when low hydraulic pressure is detected in the normal braking system. Therefore, if the normal braking system fails, pressurized fluid is supplied to the alternative braking system 268 via fluid line 270 to brake the wheels and stop their rotation while the main landing gear retracts, thereby preventing damage to components within the aircraft's wheel wells.

[0042] Pressurized fluid is supplied to the volumetric fuse 212 via fluid line 210, which allows fluid to flow through it as long as the fluid volume does not exceed a specific capacity of the volumetric fuse 212. The fluid is then supplied to a flow control valve 214, which operates to control the amount of fluid flow supplied to the main landing gear actuator 216 in order to move the piston 224 in a controlled manner, such as at a desired speed.

[0043] The fluid then flows through the flow control valve 214 to the delivery cylinder 218. The delivery cylinder 218 is configured to delay the supply of fluid to the chamber 230 until the main landing gear locking mechanism is released. In particular, the delivery cylinder 218 is configured as a delay element that allows fluid flow to be supplied to the lower locking actuator 234 to release the main landing gear locking mechanism before the main landing gear retracts. For example, the delivery cylinder 218 includes a piston 272 that divides the internal space of the delivery cylinder 218 into two chambers.

[0044] Fluid is supplied from flow control valve 214 to delivery cylinder 218, causing piston 272 to move (e.g., move to...). Figure 2 (Left side of the image). As long as piston 272 is moving and fluid is filling delivery cylinder 218, fluid is not supplied to main landing gear actuator 216. Once piston 272 reaches the end of its stroke within delivery cylinder 218, fluid is diverted to flow restrictor check valve 262 and main landing gear actuator 216.

[0045] As the piston 272 of the delivery cylinder 218 moves, fluid is supplied from the volumetric fuse 212 to the chamber 246 of the locking actuator 234 via the flow restrictor 273. The fluid supplied to the chamber 246 causes the piston 240 to extend (e.g., move to) the cylinder. Figure 2 (Left side of the middle). As the piston 272 of the delivery cylinder 218 reaches the end of its stroke, the piston 240 has also extended sufficiently to release the locking mechanism and allow the main landing gear to retract.

[0046] As the locking mechanism is released, fluid is supplied to the chamber 230 of the main landing gear actuator 216 through the flow restrictor check valve 262, causing the piston 224 to extend (e.g., move to) the chamber 230 of the main landing gear actuator 216. Figure 2 (Left side of the wheel well), thereby retracting the main landing gear toward the wheel well after takeoff. The aircraft's braking system is configured to brake the wheels and prevent them from rotating before reaching the wheel well, in order to avoid damage to the wheel well. In the event that the wheels remain rotating, the hydraulic system 200 is configured to stop the main landing gear from retracting further (i.e., to stop the piston 224 from extending) as a safety feature to avoid damage to the wheel well.

[0047] Specifically, the fragile component 220 has a lever 274. This fragile component is configured such that if the main landing gear wheels continue to rotate as the wheels retract, the lever 274 breaks. When the lever 274 breaks, fluid from the flow control valve 214 flows through the fragile component 220 and then, following the path of least resistance, flows to the external environment of the hydraulic system 200, for example, to a low-pressure volume. Therefore, the fluid velocity flowing through the volumetric fuse 212 can increase and exceed its capacity, and in response, the volumetric fuse 212 cuts off the fluid flow therethrough.

[0048] In this way, fluid is not supplied to the flow control valve 214, and the piston 224 stops extending to prevent the main landing gear from retracting further. However, the piston 224 is allowed to retract so that the main landing gear can deploy and the aircraft can land safely.

[0049] As described above, the hydraulic system 200 also works in conjunction with the piston 224 of the retracting main landing gear actuator 216 (e.g., moving the piston 224 to...). Figure 2 The second operating mode associated with the right side of the diagram is operable, which corresponds to deploying the main landing gear from the wheel wells in preparation for landing the aircraft.

[0050] Figure 3 A schematic representation of a hydraulic system 200 with arrows is shown according to an example embodiment, where the arrows indicate the direction of fluid flow in a second operating mode. In this second operating mode, the landing gear selector valve 206 supplies fluid flow to fluid line 208. The pressurized fluid flowing through fluid line 208 flows through fluid line 300 via a flow restrictor check valve 260 and then flows to delivery cylinder 218. Figure 3 As shown, the fluid line 300 is also connected to the chamber 258 of the lock actuator 236 via a flow restrictor 302.

[0051] The delivery cylinder 218 operates in a manner similar to its operation in the first operating mode, but the piston 272 moves in another direction (e.g., moves to...). Figure 3 (Right side of the image). Therefore, the delivery cylinder 218 operates as a delay element that allows fluid flow to be supplied to the locking actuator 236 to release the locking mechanism of the main landing gear before deployment. As the piston 272 moves and fluid supplied through the flow restrictor check valve 260 fills the delivery cylinder 218, fluid is not supplied to the chamber 232 of the main landing gear actuator 216. Once the piston 272 reaches the end of its stroke within the delivery cylinder 218, fluid is supplied to the chamber 232 of the main landing gear actuator 216.

[0052] As the piston 272 of the delivery cylinder 218 moves, fluid is supplied from the fluid line 300 to the chamber 258 of the locking actuator 236 via the flow restrictor 302. The fluid supplied to the chamber 258 causes the piston 252 to retract (e.g., move to) its final position. Figure 3 (Left side of the middle). As the piston 272 of the delivery cylinder 218 reaches the end of its stroke, the piston 252 has fully extended to release the locking mechanism and allow the main landing gear to deploy.

[0053] As piston 252 retracts, fluid discharged from chamber 257 flows through fluid line 304 to shimmy damper 306 and return fluid line 204. Shimmy is an oscillation in the landing gear that generates unwanted vibrations and loads on the landing gear structure. Shimmy damper 306 dampens oscillations that may occur during the movement of piston 252 to ensure smooth operation of hydraulic system 200.

[0054] As the locking mechanism is released, fluid is supplied to chamber 232 of the main landing gear actuator 216, causing piston 224 to retract (e.g., move to...). Figure 3 (on the right side of the wheel well), thereby deploying the main landing gear from the wheel well to prepare for landing. As piston 224 retracts, fluid discharged from chamber 230 flows through flow restrictor check valve 262 and then to flow control valve 214. Flow control valve 214 controls the amount of fluid discharged from main landing gear actuator 216 in order to move piston 224 in a controlled manner, such as at a desired speed.

[0055] Specifically, as the flow control valve 214 controls the flow of fluid through it, it generates back pressure in chamber 230, causing piston 224 to retract in a controlled manner. Fluid leaving the flow control valve 214 flows through volumetric fuse 212 and landing gear selector valve 206 to return fluid line 204. Therefore, the flow control valve 214 is configured to cause piston 224 of the main landing gear actuator 216 to move in a controlled manner.

[0056] Figure 4 A perspective view of the flow control valve 214 is shown. Figure 5 A cross-sectional view of the flow control valve 214 is shown, and Figure 6 A perspective cross-sectional view of the flow control valve 214 is shown according to an example embodiment. Figures 4 to 6 They are described together.

[0057] The flow control valve 214 includes a housing 400, a sleeve 412 disposed within the housing 400, and the sleeve 412 having a proximal end or first end and a distal end or second end opposite to the first end. The sleeve 412 includes a plurality of sleeve protrusions 700-706 at the first end, and a plurality of fluid flow channels 708-714 (e.g., fluid flow channels 708, 710, 712, and 714 for a total of four fluid flow channels) are formed between adjacent sleeve protrusions 700-706. The flow control valve 214 also includes a sealing carrier 424 disposed within the sleeve 412, and the sealing carrier 424 includes carrier protrusions 426, 428 extending from the second end of the sleeve 412 and abutting against the inner surface of the housing 400. The flow control valve 214 also includes an end cap 404 mounted to the housing 400 such that the plurality of sleeve protrusions 700-706 abut against the end cap 404.

[0058] The housing 400 is generally cylindrical and has a longitudinal cylindrical cavity defined therein. Components of the flow control valve 214 are disposed within the longitudinal cylindrical cavity of the housing 400. The housing 400 has a first port 402 (e.g., an opening) at its distal end 403. The first port 402 allows fluid to flow into and out of the flow control valve 214. For example, the first port 402 may be fluidly coupled to a delivery cylinder 218, a fragile fitting 220, and a flow restrictor check valve 262.

[0059] End cap 404 is coupled to housing 400 at its proximal end 401. For example, end cap 404 is threadedly coupled to housing 400 at threaded region 406 via external threads in end cap 404 and internal threads in housing 400. End cap 404 can keep flow control valve 214 intact and free from chatter and vibration, which can cause internal movement of components of flow control valve 214.

[0060] End cap 404 has a second port 408 (e.g., an opening) at the proximal end 401 of flow control valve 214 opposite to the first port 402. The second port 408 allows fluid flow through which into and out of flow control valve 214 is permitted. For example, the second port 408 may be fluidly coupled to a volumetric fuse 212. Flow control valve 214 is bidirectional and allows fluid flow through which from the first port 402 to the second port 408 or from the second port 408 to the first port 402 is permitted.

[0061] The flow control valve 214 includes a seal 410 (e.g., an O-ring) disposed in an external annular groove formed in the end cap 404 and configured to form a fluid seal between the end cap 404 and the housing 400 to prevent leakage to the external environment of the flow control valve 214. In one example, the seal 410 is inserted between support rings. For example, support rings can be used to reduce the likelihood of compression of the seal 410 as pressurization and depressurization / pressure cycles occur within the flow control valve 214.

[0062] Sleeve 412 is fixedly disposed within housing 400. Sleeve 412 is generally cylindrical and includes a corresponding longitudinal cylindrical cavity.

[0063] Figure 7 A perspective view of sleeve 412 is shown, and Figure 8 A cross-sectional view of sleeve 412 is shown according to an example embodiment. Figure 7 and Figure 8 They are described together.

[0064] The sleeve 412 has a plurality of sleeve protrusions, such as sleeve protrusion 700, sleeve protrusion 702, sleeve protrusion 704, and sleeve protrusion 706 disposed at the proximal end 401 of the sleeve 412. In one example, sleeve protrusions 700-706 are positioned as follows: Figure 7 The array shown is configured in the form of a circular array or similar array. However, other array configurations (e.g., rectangular arrays, square arrays, etc.) can be used.

[0065] In addition, in such Figure 7 In the example shown, the sleeve protrusions 700-706 are arc-shaped. However, in other examples, the sleeve protrusions 700-706 have other shapes; for example, they may be straight or rectangular. Regardless of the shape of the sleeve protrusions 700-706, they form fluid flow channels therebetween, such as fluid flow channels 708, 710, 712, and 714.

[0066] Sleeve 412 includes an orifice 716 (e.g., a stepped orifice) that defines a series of steps or shoulders at the proximal end 401 of sleeve 412 via the inner surface of sleeve 412 to accommodate other components of flow control valve 214. In other words, the inner diameter of sleeve 412 varies to define cavities of different sizes therein. For example, a cavity 718, which is part of orifice 716, is configured to receive a port plug, as described below. Shoulders 720 are defined by the transition of the inner diameter of sleeve 412 and are configured to support spring washers, as described below. Shoulders 720 can prevent fluid from flowing directly from one chamber to another and guide fluid through a transverse orifice, as described below.

[0067] Sleeve 412 includes a first set of transverse holes, such as transverse holes 722 and 724, arranged in an array around the wall of the body of sleeve 412. For example, the first set of transverse holes is arranged in a circular array around sleeve 412. Sleeve 412 also includes a second set of transverse holes, such as transverse holes 726 and 728, also arranged in an array (e.g., circular array) around the wall of sleeve 412. The second set of transverse holes is axially spaced from the first set of transverse holes along the length of sleeve 412. The term "transverse hole" is used herein to refer to a path through another hole, cavity, or channel or a hole formed transversely relative to another hole, cavity, or channel.

[0068] Sleeve 412 also includes a first flange portion 730 and a second flange portion 732 forming a groove 734 therebetween, such as an external annular groove. The outer surfaces of the first flange portion 730 and the second flange portion 732 engage with the inner surface of housing 400 (e.g., Figures 5 to 6 (as shown in the figure), and the groove 734 is configured to receive the seal and the support ring therein, as described below.

[0069] like Figure 8 As shown, the inner diameter of sleeve 412 widens near its distal end 403 to form shoulder 736 and cavity 738. Cavity 738 is configured to receive sealing carrier 424, which is located adjacent to shoulder 736.

[0070] Reference Figures 5 to 6 as well as Figures 7 to 8 The flow control valve 214 includes a plug 414 disposed in a cavity 718 of the sleeve 412. The plug 414 is configured to have a hole 416 formed therein, for example, a hole drilled therein, to allow a specific amount of fluid flow rate to pass through it.

[0071] like Figures 5 to 6As shown, sleeve 412 is disposed within housing 400 such that a first chamber 418 is formed between the outer surface of sleeve 412 and the inner surface of housing 400. Similarly, a second chamber 420 is formed between the outer surface of sleeve 412 and the inner surface of housing 400. The first chamber 418 is separated from the second chamber 420 by flange portions 730 and 732 of sleeve 412.

[0072] Furthermore, the flow control valve 214 includes a seal 422 disposed in a recess 734 of the sleeve 412 to seal the first chamber 418 with the second chamber 420. A support ring may be disposed around the seal 422 to reduce the likelihood of the seal 422 being squeezed in the recess 734 of the sleeve 412 as pressurization and depressurization / pressure cycles occur within the flow control valve 214.

[0073] A sealing carrier 424 is disposed within the cavity 738 of the sleeve 412. Similar to the sleeve 412, the sealing carrier 424 has multiple carrier protrusions, such as carrier protrusions 426 and 428, which form a fluid flow channel, such as a fluid flow channel 430, between them. As an example, the carrier protrusions 426 and 428 are arcuate in shape and arranged in a circular array. However, other configurations are possible. Furthermore, the sealing carrier 424 includes a seal 432 (e.g., an O-ring) disposed in an external annular groove formed in the sealing carrier 424 and configured to form a fluid seal between the sealing carrier 424 and the sleeve 412 to prevent fluid leakage therebetween. A support ring may also be used with the seal 432.

[0074] The sealing carrier 424 is also configured to receive a plug 434 similar to the plug 414. The plug 434 has a hole 436 formed therein to allow a specific amount of fluid flow rate to pass through it.

[0075] like Figures 5 to 6 As shown, the sleeve protrusions 700-706 are close to the distal end 403 of the end cap 404. Therefore, the sleeve 412 is axially fixed in the proximal direction via the end cap 404.

[0076] Furthermore, the sealing carrier 424 is secured in the proximal direction via the shoulder 736 of the sleeve 412 (see [link]). Figure 8 Additionally, carrier protrusions (e.g., carrier protrusions 426, 428) extend from the distal end 403 of the sleeve 412 and abut against the inner surface of the housing 400, thus axially securing the sealing carrier 424 to the housing 400 in the distal direction. With this configuration, the sleeve 412 and the sealing carrier 424 are longitudinally secured within the housing 400 via their own features (sleeve and carrier protrusions, and shoulders) without the use of additional components (e.g., spacers).

[0077] The flow control valve 214 also includes a spool 438, which is slidably received within a longitudinal cylindrical cavity of the sleeve 412 and is axially movable within the longitudinal cylindrical cavity of the sleeve 412. The spool 438 is hollow and forms a spool shoulder 440, which is an annular protrusion or ring having a hole 442 passing through it.

[0078] In addition, such as Figures 5 to 6 As shown, spool 438 is configured to receive a first spring 444 and a second spring 446 therein. Specifically, the first spring 444 has a proximal end 401 abutting a spring washer 448, which in turn abuts a shoulder 720 of sleeve 412 (see [reference]). Figure 8 The distal end 403 of the first spring 444 rests against one side of the spool shoulder 440 of the spool 438. On the other hand, the proximal end 401 of the second spring 446 rests against the other side of the spool shoulder 440, while the distal end 403 of the second spring 446 rests against the shoulder formed by the sealing carrier 424.

[0079] With this configuration, the first spring 444 applies a first spring force to the spool 438 in the distal direction, and the second spring 446 applies a second spring force to the spool 438 in the proximal direction. The spring forces hold the spool 438 in a central position. However, if the fluid pressure level on one side of the spool shoulder 440 differs from the fluid pressure level on the other side of the spool shoulder 440, the spool 438 moves axially against the spring force of one of the springs, as described below.

[0080] When spool 438 is Figures 5 to 6 In the centered position shown, the proximal end 401 of the spool 438 partially overlaps the first set of transverse holes (e.g., transverse holes 722 and 724), while the distal end 403 of the spool 438 partially overlaps the second set of transverse holes (e.g., transverse holes 726 and 728). If the spool 438 moves in the distal direction, the second set of transverse holes is further restricted (more transverse holes are blocked and the opening size of the transverse holes allowing fluid flow decreases), while the first set of transverse holes is more exposed (more transverse holes are uncovered and the opening size of the transverse holes allowing fluid flow increases).

[0081] On the other hand, if the spool 438 moves in the proximal direction, the first set of transverse orifices is further restricted (more transverse orifices are blocked, and the opening size of the transverse orifices allowing fluid flow decreases), while the second set of transverse orifices is more exposed (more transverse orifices are uncovered, and the opening size of the transverse orifices allowing fluid flow increases). With this configuration, the fluid flow rate and pressure level are modulated during operation as the spool 438 moves axially within the sleeve 412.

[0082] For example, if the direction of fluid flow is from the second port 408 to the first port 402, the fluid is received at the second port 408 and then flows through the end cap 404 to the proximal end 401 of the sleeve 412. The fluid then flows through the fluid flow channel of the sleeve 412 (i.e.,...). Figures 7 to 8 The fluid flow channels 708-714 shown flow radially outward into the first chamber 418. Then, the fluid flows radially inward through the first set of transverse holes (e.g., transverse holes 722 and 724) into the spool chamber having a first spring 444 within the spool 438.

[0083] The fluid then flows through the orifice 442 of the spool shoulder 440 into the spool chamber containing the second spring 446. As the fluid flows through the orifice 442, a pressure drop occurs (a decrease in the fluid pressure level occurs due to the fluid restriction caused by the orifice 442). This pressure drop causes the fluid force acting on the spool 438 in the distal direction to increase relative to the fluid force acting on the spool 438 in the proximal-distal direction, thereby causing the spool 438 to move in the distal direction. As the spool 438 moves in the distal direction, the second spring 446 is compressed and the first spring 444 is released.

[0084] Furthermore, as the spool 438 moves in the distal direction, the second set of transverse orifices becomes more restricted, while the first set of transverse orifices is more exposed. Fluid in the spring chamber of the second spring 446 flows radially outward through the second set of transverse orifices (now more restricted) into the second chamber 420. From the second chamber 420, fluid flows radially inward through the fluid flow passage (e.g., fluid flow passage 430) of the sealing carrier 424, then through the first port 402 and out of the flow control valve 214.

[0085] As a portion of the fluid received at the second port 408 flows through the aforementioned path (i.e., through the fluid flow channel, the annular chamber between the sleeve 412 and the housing 400, and the sets of transverse orifices), another portion of the fluid flows through the plugs 414 and 416, then through the plugs 434 and 436 to the first port 402 and out of the flow control valve 214. This configuration provides a safety feature where a specific amount of flow is provided through the flow control valve 214 in the event of an unforeseen problem. This safety feature is advantageous, for example, to allow a specific amount of fluid flow through the flow control valve 214 to allow the main landing gear actuator 216 to operate regardless of any problems.

[0086] Specifically, if the first spring 444 or the second spring 446 does not operate as intended, the spool 438 is continuously biased in one direction by another spring, thereby completely or substantially blocking the first set of transverse holes (e.g., transverse holes 722 and 724) or the second set of transverse holes (e.g., transverse holes 726 and 728). This blocks the flow of fluid through the transverse holes to and from the first chamber 418 or the second chamber 420. However, fluid flows through the holes 416 of the plug 414 and 436 of the plug 434. In this example, at least a certain amount of fluid flow is provided through the flow control valve 214 to operate the main landing gear actuator 216.

[0087] As an illustrative example, flow control valve 214 has a fluid flow rate capacity of approximately 8 gallons per minute (GPM). A portion of this quantity (e.g., generally or 4 GPM) flows through fluid flow passages 708-714, a first chamber 418, a first set of transverse orifices, a second set of transverse orifices, a second chamber 420, and a fluid flow passage (e.g., fluid flow passage 430) in the sealing carrier 424. The remainder (e.g., another half or 4 GPM) flows through orifices 416 and 436. In this example, in the event of any unintended operation within flow control valve 214, at least 4 GPM will be supplied from the second port 408 to the first port 402.

[0088] The flow control valve 214 is a two-way valve as described above, and also allows fluid flow in another direction, i.e., from the first port 402 to the second port 408. Specifically, fluid is received at the first port 402 and then flows radially outward from the fluid flow passage (e.g., fluid flow passage 430) of the sealing carrier 424 to the second chamber 420. The fluid then flows radially inward through a second set of transverse holes (e.g., transverse holes 726 and 728) to the spool chamber having a second spring 446 within the spool 438.

[0089] The fluid then flows through the hole 442 of the spool shoulder 440 into the spool chamber containing the first spring 444. As the fluid flows through the hole 442, a pressure drop occurs. This pressure drop causes the fluid force acting on the spool 438 in the distal direction to increase relative to the fluid force acting on the spool 438 in the proximal direction, thereby causing the spool 438 to move in the proximal direction. As the spool 438 moves in the proximal direction, the first spring 444 is compressed and the second spring 446 is released.

[0090] Furthermore, as the spool 438 moves in the proximal direction, the first set of transverse orifices becomes more restricted, while the second set of transverse orifices becomes more exposed. Fluid in the spring chamber of the first spring 444 flows radially outward through the first set of transverse orifices (now more restricted) into the first chamber 418. From the first chamber 418, the fluid flows radially inward through the fluid flow channels 708-714 of the sleeve 412, then through the second port 408 and out of the flow control valve 214.

[0091] As a portion of the fluid received at the first port 402 flows through the aforementioned path (i.e., through the fluid flow channel, the annular chamber, and the sets of transverse orifices), another portion of the fluid flows through orifice plugs 434 and orifice 436, then through orifice plugs 414 and orifice 416 to the second port 408 and out of flow control valve 214. This configuration provides a safety feature, wherein, in the event of any unintended operation as described above, a specific amount of flow is supplied through flow control valve 214.

[0092] In this example, the configuration of the flow control valve 214 can provide several advantages over conventional valves. For example, the sleeve 412 is configured as a multi-functional sleeve that integrates features without additional components. For example, features of such an additional sealing carrier are integrated into the sleeve 412, instead of using a second sealing carrier (in addition to sealing carrier 424) at the proximal end 401 of the sleeve 412.

[0093] Specifically, fluid flow channels 708-714 are integrated within sleeve 412, with the orifice plug 414 fixed within sleeve 412, and no seals or support rings are used. In this example, by eliminating additional sealing carriers and their associated components (seals, support rings, etc.), the cost and weight of the flow control valve 214 can be reduced, and reliability can also be increased by reducing the number of parts in operation.

[0094] Furthermore, the sleeve protrusions 700-706 abut the end cap 404, and therefore the sleeve 412 is axially fixed within the housing 400 without the need for additional spacers. Thus, the versatility of the sleeve 412 eliminates the need for another component.

[0095] Figure 9This is a flowchart of a method 900 for assembling a flow control valve 214 according to an example embodiment. Method 900 includes one or more operations or actions as shown by one or more of blocks 902-916. Although the blocks are shown sequentially, in this example, these blocks are performed in parallel and / or in a different order than those described herein. Additionally, in this example, various blocks are combined into fewer blocks, divided into additional blocks, and / or removed based on a desired implementation. It should be understood that, for this process and other processes and methods disclosed herein, the flowchart illustrates the function and operation of one possible embodiment of this example. As those skilled in the art will understand, alternative embodiments are included within the scope of the examples of this disclosure, wherein, depending on the functions involved, the functions are not performed sequentially as shown or discussed, including substantially in parallel or in reverse order.

[0096] At block 902, method 900 includes positioning a sleeve 412 within a housing 400, and the sleeve 412 having a first end (e.g., proximal end 401) and a second end opposite to the first end (e.g., distal end 403). The sleeve 412 includes sleeve protrusions 700-706 at the first end, and a plurality of fluid flow channels 708-714 are formed between adjacent sleeve protrusions (e.g., between sleeve protrusions 700-706).

[0097] At block 904, method 900 includes positioning a sealing carrier 424 within sleeve 412, and the sealing carrier 424 includes carrier protrusions 426, 428 that extend from a second end of sleeve 412 and abut against the inner surface of housing 400.

[0098] At block 906, method 900 may optionally include mounting a plug 434 in a cavity of sealing carrier 424, and the plug 434 including a hole 436 therein to allow fluid flow through it.

[0099] At box 908, method 900 may optionally include positioning spool 438 within sleeve 412, and spool 438 being slidably received within sleeve 412 and including spool shoulder 440.

[0100] At box 910, method 900 may optionally include mounting a first spring 444 between the shoulder 440 of the spindle and the shoulder 720 of the sleeve 412.

[0101] At box 912, method 900 may optionally include mounting a second spring 446 between the threaded shoulder 440 and the sealing carrier 424.

[0102] At block 914, method 900 may optionally include mounting a plug 414 in the cavity 718 of sleeve 412, and the plug 414 includes a hole 416 therein to allow fluid flow through it.

[0103] At box 916, method 900 includes mounting end cap 404 to housing 400 such that sleeve protrusions 700-706 abut against end cap 404.

[0104] The detailed description above, with reference to the accompanying drawings, illustrates various features and operations of the disclosed system. The illustrative embodiments shown herein are not intended to be limiting. Certain aspects of the disclosed system can be arranged and combined in a wide variety of different configurations, all of which are contemplated herein.

[0105] Furthermore, unless the context otherwise requires, the features shown in each figure may be used in combination with each other. Therefore, the figures should be... Figure 1 Generally considered as components of one or more overall embodiments, it should be understood that not all features shown are necessary for each embodiment.

[0106] Furthermore, any enumeration of elements, blocks, or steps in this specification or claims is for clarity purposes only. Therefore, such enumeration should not be construed as requiring or implying that these elements, blocks, or steps are performed in a particular arrangement or in a particular order.

[0107] Furthermore, in the examples, the apparatus or system is used or configured to perform the functions shown in the accompanying drawings. In some instances, components of the apparatus and / or system are configured to perform functions such that the components are actually configured and structured (in hardware and / or software) to achieve this performance. In other examples, components of the apparatus and / or system are arranged to be suitable for, able to, or adapted to perform functions, such as functions that, when operated in a particular manner.

[0108] Furthermore, this disclosure includes implementations based on the following examples:

[0109] Example 1. A flow control valve comprising: a housing; a sleeve disposed within the housing, wherein the sleeve has a first end and a second end opposite to the first end, wherein the sleeve includes a plurality of sleeve protrusions at the first end, and a plurality of fluid flow channels are formed between adjacent sleeve protrusions; a sealing carrier disposed within the sleeve, wherein the sealing carrier includes a carrier protrusion extending from the second end of the sleeve and abutting against an inner surface of the housing; and an end cap mounted to the housing such that the plurality of sleeve protrusions abut against the end cap.

[0110] Example 2. The flow control valve according to Example 1, wherein the housing includes a first port, and wherein the end cap includes a second port opposite to the first port.

[0111] Example 3. The flow control valve according to Example 1 or Example 2, further comprising: a spool slidably received within a sleeve.

[0112] Example 4. The flow control valve according to Example 1 or Example 2, wherein the sleeve further includes: a first set of transverse holes disposed around the sleeve; and a second set of transverse holes disposed around the sleeve, wherein the second set of transverse holes is axially spaced from the first set of transverse holes along the length of the sleeve.

[0113] Example 5. The flow control valve according to Example 4, further comprising: a spool slidably received within a sleeve, wherein the proximal end of the spool partially overlaps a first set of transverse holes, and wherein the distal end of the spool partially overlaps a second set of transverse holes.

[0114] Example 6. The flow control valve according to Example 4 or Example 5, further comprising: a first chamber formed between an outer surface of the sleeve and an inner surface of the housing, wherein the first chamber fluidly connects a plurality of fluid flow channels of the sleeve to a first set of transverse holes of the sleeve; and a second chamber formed between an outer surface of the sleeve and an inner surface of the housing, wherein the second chamber fluidly connects a second set of transverse holes of the sleeve to a distal end of a sealing carrier.

[0115] Example 7. The flow control valve according to any one of Examples 1 to 6, wherein the sleeve further includes a first flange portion and a second flange portion forming a groove therebetween, wherein the flow control valve further includes a seal disposed in the groove of the sleeve.

[0116] Example 8. The flow control valve according to any one of Examples 1 to 7 further includes an orifice plug disposed in the cavity of the sleeve and having an orifice formed therein.

[0117] Example 9. The flow control valve according to any one of Examples 1 to 8, the flow control valve further comprising: an orifice plug disposed within a sealing carrier and having an orifice therein.

[0118] Example 10. A flow control valve according to any one of Examples 1 to 9, wherein a plurality of sleeve protrusions are arranged in an array at a first end of the sleeve, such that a plurality of fluid flow channels are formed therebetween.

[0119] Example 11. The flow control valve according to Example 10, wherein a plurality of sleeve protrusions are arc-shaped.

[0120] Example 12. A flow control valve according to Example 10 or Example 11, wherein a plurality of sleeve protrusions are arranged in a circular array at the first end of the sleeve.

[0121] Example 13. A hydraulic system comprising: a cylinder having a chamber; and a flow control valve fluidly coupled to the chamber of the cylinder and configured to control fluid flow to and from the chamber, wherein the flow control valve comprises: a housing, a sleeve disposed within the housing, a sealing carrier disposed within the sleeve, and an end cap, wherein the sleeve has a first end and a second end opposite to the first end, wherein the sleeve includes a plurality of sleeve protrusions at the first end, and a plurality of fluid flow channels are formed between adjacent sleeve protrusions, wherein the sealing carrier includes a carrier protrusion extending from the second end of the sleeve and abutting against an inner surface of the housing, and the end cap is mounted to the housing such that the plurality of sleeve protrusions abut against the end cap.

[0122] Example 14. The hydraulic system according to Example 13, wherein the housing includes a first port fluidly connected to a chamber of a cylinder, and wherein the end cap includes a second port opposite to the first port, the second port being fluidly connected to a fluid line to receive fluid therefrom or to supply fluid thereto.

[0123] Example 15. The hydraulic system according to Example 14 further includes a volumetric fuse fluidly connected to a second port, wherein the volumetric fuse is configured to cut off the fluid flow to a flow control valve when the fluid flow rate through it exceeds the capacity of the volumetric fuse.

[0124] Example 16. The hydraulic system according to Example 14 or Example 15 further includes: a delivery cylinder fluidly coupled to a first port of the housing, wherein the delivery cylinder is configured to receive fluid from a flow control valve and delay supplying fluid to the chamber of the cylinder.

[0125] Example 17. The hydraulic system according to any one of Examples 13 to 16, the hydraulic system further comprising: a flow restrictor check valve disposed between the flow control valve and the chamber of the cylinder, wherein the flow restrictor check valve is configured to allow free fluid to flow into the chamber while restricting the flow of fluid discharged from the chamber.

[0126] Example 18. A hydraulic system according to any one of Examples 13 to 17, wherein a cylinder is included in the actuator of the aircraft landing gear, wherein a flow control valve controls the fluid flow to and from the chamber to retract and deploy the landing gear.

[0127] Example 19. A method for assembling a flow control valve, the method comprising: positioning a sleeve within a housing, wherein the sleeve has a first end and a second end opposite to the first end, wherein the sleeve includes a plurality of sleeve protrusions at the first end and a plurality of fluid flow channels are formed between adjacent sleeve protrusions; positioning a sealing carrier within the sleeve, wherein the sealing carrier includes a carrier protrusion extending from the second end of the sleeve and abutting against an inner surface of the housing; and mounting an end cap to the housing such that the plurality of sleeve protrusions abut against the end cap.

[0128] Example 20. The method of Example 19, wherein the sleeve includes a cavity therein, wherein the method further comprises: installing a plug in the cavity of the sleeve, wherein the plug includes a hole therein to allow fluid flow through it.

[0129] By using the term "substantially," it means that the listed characteristics, parameters, or values ​​do not need to be precisely achieved, but rather that deviations or variations occur in quantity, including, for example, tolerances, measurement errors, measurement accuracy limitations, and other factors known to those skilled in the art, which do not preclude the effect intended to provide the characteristics.

[0130] The arrangements described herein are for illustrative purposes only. Therefore, those skilled in the art will understand that other arrangements and other elements (e.g., machines, interfaces, operations, commands, and operation groups, etc.) can be used alternatively, and some elements can be omitted entirely depending on the desired outcome. Furthermore, many of the elements described are functional entities that can be implemented as discrete or distributed components or in combination with other components in any suitable combination and location.

[0131] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The aspects and embodiments disclosed herein are for illustrative purposes and are not intended to be limiting; their true scope is indicated by the appended claims and the full scope of their equivalents. Furthermore, the terminology used herein is for describing particular embodiments only and is not intended to be limiting.

Claims

1. A flow control valve (214), the flow control valve (214) comprising: Housing (400), wherein the housing (400) includes a first port (402); A sleeve (412) disposed within the housing (400) has a first end and a second end opposite to the first end. The sleeve (412) includes a plurality of sleeve protrusions (700-706) at the first end, and a plurality of fluid flow channels (708-714) are formed between adjacent sleeve protrusions (700-706). A sealing carrier (424) is disposed within the sleeve (412), wherein the sealing carrier (424) includes a carrier protrusion (426, 428) that extends from the second end of the sleeve (412) and abuts against the inner surface of the housing (400); and End cap (404), which is mounted to the housing (400) such that the plurality of sleeve protrusions (700-706) are in close contact with the end cap (404), wherein the end cap (404) includes a second port (408) opposite to the first port (402). A spool (438) is slidably housed within the sleeve (412). The spool (438) moves axially within the sleeve (412) to change the overlap area between the end of the spool and the transverse holes provided around the sleeve (412), thereby regulating the fluid flow rate. The transverse holes include a first set of transverse holes (722, 724) and a second set of transverse holes (726, 728). The second set of transverse holes (726, 728) is axially spaced from the first set of transverse holes (722, 724) along the length of the sleeve (412). The sleeve has a plug inside its cavity, and the plug has a hole through which it passes.

2. The flow control valve (214) according to claim 1, wherein the proximal end of the spool (438) partially overlaps the first set of transverse holes (722, 724), and wherein the distal end of the spool (438) partially overlaps the second set of transverse holes (726, 728). When the spool (438) moves in the proximal direction, the first set of transverse holes is further restricted, while the second set of transverse holes is more exposed; when the spool (438) moves in the distal direction, the second set of transverse holes is further restricted, while the first set of transverse holes is more exposed.

3. The flow control valve (214) according to claim 1, wherein the flow control valve (214) further comprises: A first chamber (418) is formed between the outer surface of the sleeve (412) and the inner surface of the housing (400), wherein the first chamber (418) fluidly connects the plurality of fluid flow channels (708-714) of the sleeve (412) to the first set of transverse holes (722, 724) of the sleeve (412); and A second chamber (420) is formed between the outer surface of the sleeve (412) and the inner surface of the housing (400), wherein the second chamber (420) fluidly connects the second set of transverse holes (726, 728) of the sleeve (412) to the distal end of the sealing carrier (424).

4. The flow control valve (214) according to claim 1, wherein the sleeve (412) further comprises a first flange portion (730) and a second flange portion (732), a groove (734) being formed between the first flange portion (730) and the second flange portion (732), wherein the flow control valve (214) further comprises: A seal (422) is disposed in the groove of the sleeve (412).

5. The flow control valve (214) according to claim 1, wherein the plurality of sleeve protrusions (700-706) are arranged in an array at the first end of the sleeve (412) such that the plurality of fluid flow channels (708-714) are formed between the plurality of sleeve protrusions (700-706).

6. A hydraulic system (200), the hydraulic system (200) comprising: A cylinder (222) having a chamber (230); and The flow control valve (214) according to any one of claims 1 to 5, wherein the flow control valve (214) is fluidly coupled to the chamber (230) of the cylinder (222) and configured to control the fluid flow to and from the chamber (230).

7. A method (900) for assembling a flow control valve (214), the method (900) comprising: A sleeve (412) is positioned (902) within a housing (400), wherein the sleeve (412) has a first end and a second end opposite to the first end, wherein the sleeve (412) includes a plurality of sleeve protrusions (700-706) at the first end, and a plurality of fluid flow channels (708-714) are formed between adjacent sleeve protrusions (700-706), and wherein the housing (400) includes a first port (402). Positioning (904) of a sealing carrier (424) within the sleeve (412), wherein the sealing carrier (424) includes carrier protrusions (426, 428) that extend from the second end of the sleeve (412) and abut against the inner surface of the housing (400); as well as The end cap (404) is mounted (906) to the housing (400) such that the plurality of sleeve protrusions (700-706) are close to the end cap (404), wherein the end cap (404) includes a second port (408) opposite to the first port (402). A spool (438) is slidably mounted (906) within the sleeve (412) such that the proximal end of the spool partially overlaps with a first set of transverse holes (722, 724) arranged around the sleeve (412), and the distal end of the spool (438) partially overlaps with a second set of transverse holes (726, 728) arranged around the sleeve (412), thereby regulating the fluid flow rate by axial movement of the spool, wherein the second set of transverse holes (726, 728) is axially spaced from the first set of transverse holes (722, 724) along the length of the sleeve (412). The sleeve has a plug (414) inside its cavity (718), and the plug (414) has a hole (416) formed therein.

8. The method (900) according to claim 7, wherein the method (900) further comprises: The plug (414) is installed (1000) in the cavity (718), wherein the hole (416) in the plug (414) allows fluid to flow through it.

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