Spring reset valve device

Abstract

A spring return cartridge for a rotary actuation valve includes a torsion spring having a spring loaded intermediate portion between a first end and a second end and a spring bracket sleeved with the torsion spring. The spring bracket includes: a first portion rotationally fixed to a first end of the torsion spring; and a second portion rotatably coupled with the second end portion of the torsion spring such that the second end portion of the torsion spring is rotatable relative to the spring bracket and relative to the first end portion of the torsion spring between a first rotational limit position and a second rotational limit position, wherein an intermediate portion of the torsion spring biases the torsion spring second end to the first rotational limit position and maintains a spring loaded state in the first rotational limit position.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all benefits of U.S. Provisional Patent Application No. 63 / 390,683, filed on July 20, 2022, for a "SPRING RETURN VALVE HANDLE WITH PRELOADED SPRING RETURNSUBASSEMBLY," and U.S. Provisional Patent Application No. 63 / 494,261, filed on April 5, 2023, for a "SPRING RETURN VALVE HANDLE ARRANGEMENT S," and the entire disclosure of each application is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to spring return handles. More particularly, the present disclosure relates to spring return valve handles for rotary actuated valves. Background Art

[0004] Manually operated fluid control valves are used in many applications. As an example, a grab sample panel provided with a main process line includes a manually operated sampling valve for selectively dispensing a sample of the process fluid into a sample container or bottle. In such an application, failure of an operator to fully close the valve (e.g., by manually rotating a valve handle to a closed position) may result in an undesired release of fluid and lead to potential safety issues, contamination, and production losses. Summary of the invention

[0005] According to exemplary aspects of one or more inventions set forth in the present disclosure, a spring return cylinder includes: a torsion spring having a spring-loaded middle portion extending between a first end and a second end; and a spring bracket, the spring bracket being sleeved with the torsion spring. The spring bracket includes: a first portion, the first portion being rotationally fixed to the first end of the torsion spring; and a second portion, the second portion being rotatably coupled to the second end of the torsion spring, so that the second end of the torsion spring can rotate between a first rotation limit position and a second rotation limit position relative to the spring bracket and relative to the first end of the torsion spring. The middle portion of the torsion spring biases the second end of the torsion spring to the first rotation limit position and maintains the spring-loaded state in the first rotation limit position.

[0006] In some embodiments, the first end of the torsion spring includes at least one fastener hole that is aligned with a corresponding fastener hole in the first portion of the spring bracket, wherein a fastener is installed through the aligned fastener hole to rotationally secure the first end of the torsion spring to the first portion of the spring bracket.

[0007] In some embodiments, the second end of the torsion spring includes at least one fastener hole that is aligned with a corresponding slot in the second portion of the spring bracket, wherein a fastener is installed in the fastener hole and extends through the slot to rotatably secure the second end of the torsion spring to the second portion of the spring bracket.

[0008] In some implementations, the first end of the torsion spring includes a first end collar that provides one or more attachment points to the first portion of the spring bracket.

[0009] In some implementations, the first end collar is integrally formed with the torsion spring intermediate portion.

[0010] In some implementations, the second end of the torsion spring includes a second end collar that provides one or more attachment points to the second portion of the spring bracket.

[0011] In some implementations, the second end collar is integrally formed with the torsion spring intermediate portion.

[0012] In some implementations, the torsion spring is housed within the spring bracket.

[0013] In some implementations, the spring loaded intermediate portion and the first and second ends of the torsion spring are formed as an integral assembly.

[0014] In some implementations, the spring bracket is assembled with the torsion spring.

[0015] In some implementations, the torsion spring includes a coil spring.

[0016] In some implementations, the torsion spring includes a coil spring.

[0017] In some implementations, the first portion of the spring bracket includes a lower end portion of the spring bracket, and the second portion of the spring bracket includes an upper end portion of the spring bracket.

[0018] In some implementations, the spring bracket is integrally formed with the torsion spring.

[0019] In some implementations, the torsion spring comprises a coil spring, wherein the first end of the torsion spring comprises an outer radial portion of the coil spring and the second end of the torsion spring comprises an inner radial portion of the coil spring.

[0020] In some implementations, the second end of the torsion spring includes a shaft that is surrounded by the spring-loaded middle portion of the torsion spring.

[0021] In some embodiments, the spring bracket includes an inner peripheral first interlocking portion, and the shaft includes an outer peripheral second interlocking portion, which is radially aligned with the first interlocking portion so that the first interlocking portion and the second interlocking portion engage with each other to define a first rotational limit position and a second rotational limit position of the second end of the torsion spring.

[0022] In some implementations, the first interlocking portion includes at least one radially inwardly extending protrusion, and the second interlocking portion includes at least one arcuate recess that receives the at least one radially inwardly extending protrusion.

[0023] In some implementations, the at least one radially inwardly extending protrusion includes a pin that is mounted through a hole in the spring bracket second portion.

[0024] In some implementations, the shaft includes a lower bore portion for receiving a valve stem of the rotary actuated valve when the spring return cartridge is installed on the rotary actuated valve.

[0025] In some implementations, the shaft includes an upper stem extension configured to attach to a valve handle.

[0026] In some implementations, the shaft includes an upper bore portion for receiving a stem extension configured to be attached to a valve handle.

[0027] In some implementations, the spring return cylinder further includes a guide rod extension mounted in the upper hole portion.

[0028] In some implementations, the spring return cylinder further includes a cover plate that is fixed to the shaft and covers the spring bracket and an upper end of the torsion spring.

[0029] According to exemplary aspects of one or more inventions set forth in the present disclosure, a spring return cylinder includes: a torsion spring having an outer radial first end and an inner radial second end; a spring bracket surrounding the torsion spring and rotationally fixed to the outer radial first end; and a shaft surrounded by the torsion spring and rotationally fixed to the inner radial second end.

[0030] In some embodiments, the spring bracket is rotatably coupled to the shaft so that the shaft can rotate relative to the spring bracket between a first rotational limit position and a second rotational limit position, wherein the torsion spring biases the shaft to the first rotational limit position and maintains a spring-loaded state in the first rotational limit position.

[0031] In some implementations, the spring bracket is integrally formed with the torsion spring.

[0032] In some implementations, the shaft is integrally formed with the torsion spring.

[0033] In some embodiments, the spring bracket includes an inner peripheral first interlocking portion, and the shaft includes an outer peripheral second interlocking portion, which is radially aligned with the first interlocking portion so that the first interlocking portion and the second interlocking portion engage with each other to define a first rotational limit position and a second rotational limit position of the second end of the torsion spring.

[0034] In some embodiments, one of the first interlocking portion and the second interlocking portion includes at least one radially extending protrusion, and the other of the first interlocking portion and the second interlocking portion includes at least one arcuate recess for receiving the at least one radially extending protrusion, and the shape of the at least one arcuate recess is designed to define the first rotational limit position and the second rotational limit position.

[0035] In some implementations, the at least one radially extending protrusion includes a pin that is mounted through a hole in the spring bracket.

[0036] In some implementations, the at least one radially extending protrusion is integrally formed with the spring bracket.

[0037] In some implementations, the shaft includes a lower bore portion for receiving a valve stem of the rotary actuated valve when the spring return cartridge is installed on the rotary actuated valve.

[0038] In some implementations, the shaft includes an upper bore portion for receiving a stem extension configured to be attached to a valve handle.

[0039] In some implementations, the spring return cylinder further includes a guide rod extension mounted in the upper hole portion.

[0040] In some implementations, at least one of the guide rod extension and the upper bore portion includes a ribbed surface to provide a press-fit retention of the guide rod extension to the shaft.

[0041] In some implementations, the spring return cylinder further includes a cover plate that is fixed to the shaft and covers the spring bracket and an upper end of the torsion spring.

[0042] In some implementations, the shaft includes an upper stem extension configured to attach to a valve handle.

[0043] In some implementations, the spring bracket, the torsion spring, and the shaft are formed as an integral assembly.

[0044] In some implementations, the spring bracket, the torsion spring, and the shaft are formed using additive manufacturing.

[0045] According to another exemplary aspect of one or more inventions set forth in the present disclosure, a spring return handle device includes a spring return cylinder (e.g., a spring return cylinder including one or more of the above-described features), a valve handle graspable by a user, and a guide rod. The spring return cylinder includes: a torsion spring having a spring-loaded middle portion extending between a first end and a second end; and a spring bracket, the spring bracket being sleeved with the torsion spring and having a first portion and a second portion, the first portion being rotationally fixed to the first end of the torsion spring and attachable to the valve body of the valve, the second portion being rotatably coupled to the second end of the torsion spring. The guide rod can be inserted through the spring return cylinder and includes an end portion and a guide rod interlocking portion, the end portion being attachable to the valve handle, the guide rod interlocking portion being configured to interlock with the spring interlocking portion on the second end of the torsion spring.

[0046] In some implementations, the guide rod interlock portion includes a shoulder surface and the spring interlock portion includes a complementary shaped countersunk surface for mating engagement with the shoulder surface.

[0047] In some implementations, the shoulder surface and the countersunk surface include interlocking ridged surfaces.

[0048] In some implementations, the shoulder surface and the countersunk surface include knurled surfaces.

[0049] In some implementations, the device further includes a nut threadably connectable to the guide rod end and configured to be screwed onto the spring interlocking portion to maintain an interlocking engagement between the spring interlocking portion and the guide rod interlocking portion.

[0050] In some implementations, the guide stem includes a guide stem extension having a lower bore configured to receive a valve stem of the valve.

[0051] According to another exemplary aspect of one or more inventions presented in the present disclosure, a valve assembly includes: a valve having a valve body and a rotatable valve stem extending from the valve body; and a spring return handle device (e.g., a spring return handle device including any of the above features), wherein a first portion of the spring bracket is assembled with the valve body, and a second end of the torsion spring is assembled with the valve stem and rotationally fixed.

[0052] In some implementations, the valve body includes a bonnet portion, wherein the first portion of the spring bracket is assembled with the bonnet portion.

[0053] In some implementations, the first portion of the spring bracket is threadably assembled with the valve cover portion.

[0054] In some implementations, the valve assembly further includes a guide stem extension, the guide stem extension being assembled with the valve stem.

[0055] In some implementations, the guide stem extension includes a lower aperture that receives the valve stem.

[0056] According to another exemplary aspect of one or more inventions set forth in the present disclosure, a method for assembling a preloaded spring return cylinder is provided. In the exemplary method, a torsion spring is sleeved with a spring bracket. The first end of the torsion spring is rotationally fixed to the first portion of the spring bracket. The second end of the torsion spring is rotated to a preloaded first rotational position. The second end of the torsion spring is rotatably fixed to the second portion of the spring bracket in the preloaded first rotational position.

[0057] According to another exemplary aspect of one or more inventions set forth in the present disclosure, a method for mounting a preloaded spring return cartridge and a valve handle on a valve is provided, the valve having a valve body and a guide rod extending from the valve body. In an exemplary method, when the guide rod is in a desired spring return rotational position, the guide rod is inserted through a central hole of the spring return cartridge. A spring interlocking portion of the spring return cartridge is fixed in mating engagement with a guide rod interlocking portion of the guide rod. The valve handle is assembled with the guide rod.

[0058] According to another exemplary aspect of one or more inventions set forth in the present disclosure, a method for preloading a spring return cylinder for a rotary actuated valve is provided, wherein the spring return cylinder comprises: a torsion spring having an outer radial first end and an inner radial second end; a spring bracket, the spring bracket surrounding the torsion spring and being rotationally fixed with the outer radial first end; and a shaft, the shaft being surrounded by the torsion spring and being rotationally fixed with the inner radial second end. In an exemplary method, the shaft is rotated relative to the spring bracket to a first rotation limit position in which the torsion spring is in a spring-loaded state. An inner circumferential first interlocking portion on the spring bracket engages with an outer circumferential second interlocking portion on the shaft to fix the shaft in the first rotation limit position. The first interlocking portion and the second interlocking portion are configured to allow the shaft to rotate to a second rotation limit position defined by the engagement of the first interlocking portion and the second interlocking portion, wherein the spring-loaded torsion spring is configured to bias the shaft toward the first rotation limit position.

[0059] In some embodiments, one of the first interlocking portion and the second interlocking portion includes at least one radially extending protrusion, and the other of the first interlocking portion and the second interlocking portion includes at least one arcuate recess for receiving the at least one radially extending protrusion, and the shape of the arcuate recess is designed to define the first rotational limit position and the second rotational limit position.

[0060] In some implementations, the at least one radially extending protrusion includes a pin that is mounted through a hole in the spring bracket.

[0061] In some implementations, the at least one radially extending protrusion is integrally formed with the spring bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a schematic cross-sectional side view of a preloaded spring return cartridge according to an exemplary embodiment of the present disclosure;

[0063] Figure 2 According to an exemplary embodiment of the present disclosure, Figure 1 A schematic cross-sectional side view of a valve assembly with a preloaded spring return cartridge;

[0064] Figure 3 is an exploded perspective view of a preload spring return cylinder according to an exemplary embodiment of the present disclosure;

[0065] Figure 4 yes Figure 3 A perspective view of a preloaded spring return cylinder having a guide rod extension, a clamping nut and a set screw;

[0066] Figure 5According to an exemplary embodiment of the present disclosure, Figure 3 A partial cross-sectional perspective view of a valve assembly with a preloaded spring return cartridge;

[0067] FIG. 6A to FIG. 6D Shows Figure 5 A perspective view of a valve assembly during an exemplary assembly process;

[0068] Fig. 7A An exemplary guide rod extension having a triangular lower hole is shown;

[0069] Figure 7B yes Fig. 7A A plan view of the triangular lower hole of the guide rod extension;

[0070] Fig. 8A is an exploded perspective view of a preloaded spring return cartridge for a rotary actuated valve according to an exemplary embodiment of the present disclosure;

[0071] Figure 8B yes Fig. 8A A partial cross-sectional perspective view of a spring return cylinder element of a spring return cylinder;

[0072] Figure 8C yes Fig. 8A A bottom view of the spring return cylinder shown in a preloaded configuration;

[0073] Fig. 9 is a cross-sectional perspective view of a valve assembly including the spring return cartridge of FIG. 8 shown in a preloaded configuration according to an exemplary embodiment of the present disclosure;

[0074] Fig. 10A is a bottom view of a spring return cylinder having a spring bracket with an integrally formed flexible interlocking portion according to an exemplary embodiment of the present disclosure, the spring return cylinder being shown in an unloaded state;

[0075] Fig. 10B yes Fig. 10A A bottom view of the spring return cylinder shown in a preloaded first rotational limit position;

[0076] Fig. 10C yes Fig. 10A A bottom view of the spring return cylinder shown in a second rotational limit position;

[0077] Fig.11 is a cross-sectional perspective view of a spring return cylinder having a central shaft with an integrally formed flexible interlocking portion according to another exemplary embodiment of the present disclosure, the spring return cylinder being shown in an unloaded state;

[0078] Fig.11A yes Fig.11A bottom view of the spring return cylinder shown in an unloaded state;

[0079] Fig. 11B yes Fig.11 A bottom view of the spring return cylinder shown in a preloaded first rotational limit position; and

[0080] Fig. 11C yes Fig.11 A bottom view of the spring return cylinder is shown in the second rotational limit position. DETAILED DESCRIPTION

[0081] The specific embodiments describe only exemplary embodiments and are not intended to limit the scope of the claims in any way. In fact, the claimed invention is broader than the exemplary embodiments and is not limited thereto, and the terms used in the claims have their full ordinary meaning. For example, although the illustrated exemplary embodiments disclosed herein describe a spring return valve handle device for a quarter-turn ball valve, the features of the present disclosure may be applied in addition or alternatively to other types of manually actuated valves (e.g., plug valves, needle valves, diaphragm valves, etc.), other rotating handle-operated devices (e.g., electromechanical switch-operated devices) or devices having handles operable within different ranges of motion (e.g., half a turn or 180°, three-quarters of a turn or 270°, or any other suitable degree of rotation).

[0082] Although various creative aspects, concepts and features of the present invention may be described and shown herein as embodied in combination in exemplary embodiments, these various aspects, concepts and features may be used individually or in various combinations and sub-combinations thereof in many alternative embodiments. Unless expressly excluded herein, all such combinations and sub-combinations are intended to fall within the scope of the present invention. Further, although various alternative embodiments (such as alternative materials, structures, configurations, methods, circuits, devices and components, alternatives to formation, assembly and function, etc.) about various aspects, concepts and features of the present invention may be described herein, such descriptions are not intended to be complete or exhaustive enumerations of available alternative embodiments (whether currently known or later developed). Those skilled in the art may easily use one or more of the creative aspects, concepts or features for additional embodiments and uses within the scope of the present invention, even if such embodiments are not explicitly disclosed herein. In addition, even if some features, concepts or aspects of the present invention may be described herein as preferred arrangements or methods, such descriptions are not intended to imply that such features are necessary or essential, unless it is explicitly stated that the case is so. Further, exemplary or representative values ​​and ranges may be included to aid in understanding the present disclosure, however, such values ​​and ranges should not be interpreted in a limiting sense and are intended to be critical values ​​or ranges only where explicitly stated. Unless otherwise expressly stated, a parameter identified as "approximately" or "about" a specified value is intended to include the specified value, values ​​within 5% of the specified value, and values ​​within 10% of the specified value. In addition, it should be understood that the drawings accompanying the present disclosure may, but need not, be drawn to scale, and thus may be understood to teach various ratios and proportions apparent in the drawings. In addition, while various aspects, features, and concepts may be expressly identified herein as being inventive or forming part of the present invention, such identification is not intended to be exclusive, but there may be inventive aspects, concepts, and features that are fully described herein and not expressly identified as such or as part of a particular invention, which is instead set forth in the accompanying claims. The description of an exemplary method or process is not limited to including all steps required in all cases, nor should the order in which the steps are presented be interpreted as being required or necessary unless expressly so stated.

[0083] In many applications, it may be desirable to provide a mechanism for ensuring that when an operator releases a manual actuator (e.g., a handle), a manually actuated valve (or other such device) returns to a desired state (e.g., a closed state), for example to prevent undesired fluid flow. Such a mechanism is often referred to as a "panic brake" handle. An exemplary arrangement for a spring return handle is disclosed in commonly owned U.S. Patent No. 11,698,144, entitled "SPRING RETURN VALVE HANDLE," the entire disclosure of which is incorporated herein by reference.

[0084] According to an exemplary aspect of the present disclosure, a spring return handle device may be provided with a preloaded spring return cylinder (e.g., a subassembly or an integral assembly) that is configured to be assembled with a valve stem for providing a spring-loaded biased rotational force to the valve stem to return the valve stem to a first rotational limit position.

[0085] In an exemplary arrangement, as Figure 1 As schematically shown in FIG. 1 , the preload spring return cylinder 10 includes a torsion spring (e.g., a helical spring or spiral spring) 20 encased in a spring bracket 30. The first (e.g., lower or outer radial) end 21 of the torsion spring 20 is rotationally fixed to a first portion (e.g., lower end) 31 of the spring bracket 30, and the second (e.g., upper or inner radial) end 22 of the torsion spring is rotatably coupled to a second portion (e.g., upper end) 32 of the spring bracket, such that the second end of the torsion spring can be rotated between a first rotational position and a second rotational position relative to the spring bracket and relative to the first end of the torsion spring by torsion or twisting movement of an intermediate or middle layer (e.g., coiled) portion 23 of the torsion spring. The second end 22 of the torsion spring 20 can be fixed to the second portion 32 of the spring bracket 30, wherein the intermediate spring portion 23 is in a preloaded or energized state, so that the second end of the torsion spring is maintained in the first rotational position without applying a rotational force to the second end of the torsion spring. In the illustrated embodiment, the spring bracket 30 is a hollow (e.g., tubular) housing or sleeve assembly surrounding the torsion spring 20. In other embodiments (not shown), the spring bracket can be surrounded by the torsion spring while still rotationally fixedly attached to the first end of the torsion spring, and rotatably attached to the second end of the torsion spring. As used herein, "enclosed" includes arrangements in which a first component is surrounded by a second component ("enclosed within the second component") as well as arrangements in which a first component surrounds a second component ("enclosed around the second component").

[0086] Many different arrangements can be used (either directly or using one or more intermediate attachment components) to rotationally secure the first end 21 of the torsion spring 20 to the first portion 31 of the spring bracket 30. For example, the first end 21 of the torsion spring 20 can be secured to the first portion 31 of the spring bracket 30 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. As an example, the first end of the torsion spring can be provided with one or more fastener holes or apertures that align with corresponding fastener holes or apertures in the first portion of the spring bracket, wherein fasteners (e.g., pins, machine screws, rivets, etc.) are installed through these fastener holes or apertures to rotationally secure the first end of the torsion spring to the first portion of the spring bracket.

[0087] Many different arrangements can be used (either directly or using one or more intermediate attachment components) to rotatably secure the second end 22 of the torsion spring 20 to the second portion 32 of the spring bracket 30. For example, the second end 22 of the torsion spring 20 can be secured to the second portion 32 of the spring bracket 30 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. As an example, the second end of the torsion spring can be provided with one or more fastener holes or apertures that align with corresponding slots or cutouts in the second portion of the spring bracket, wherein fasteners (e.g., pins, machine screws, rivets, etc.) are installed through these fastener holes or apertures to rotatably secure the second end of the torsion spring to the second portion of the spring bracket.

[0088] The preloaded spring return cartridge can be used with a variety of devices, including, for example, a rotary valve assembly. As shown, the spring return cartridge can include a central hole sized to receive a valve stem therethrough for rotationally securing the valve stem to the rotatable spring-biased second end 22 of the torsion spring 20.

[0089] Figure 2The preloaded spring return cartridge 10 is schematically shown assembled with an exemplary rotary valve 50 and a valve handle 90 for user actuation of the valve. The valve 50 includes a valve body 51 defining an internal cavity 52 that holds a valve element 56 connected or fixed to (e.g., integral with or assembled with) a guide rod 70. The guide rod 70 extends from an upper valve cover portion 53 of the valve body 51 and passes through a central hole of the spring return cartridge and is rotatable between a first position (e.g., a closed position, a reduced flow position, a first switch position) and a second position (e.g., an open position, an increased flow position, a second switch position) to adjust the position of the valve element 56. As shown, the first portion 31 of the spring bracket 30 is rotationally fixed to the valve body 51 (e.g., fixed to the valve cover portion 53 of the valve body), and the second end 22 of the torsion spring 20 is rotationally fixed to the interlocking portion 77 of the guide rod 70. The valve handle 90 is rotationally fixed to the end 78 of the guide rod 70 (e.g., using a set screw installed through the valve handle and threaded on the flat portion of the guide rod end) to allow the user to rotate the guide rod and the torsion spring second end 22 from the first rotational position to the second rotational position, for example, by grasping and rotating the valve handle, against the biasing force of the preloaded torsion spring 20. When the valve handle 90 is released, the torsion spring second end 22, the guide rod 70 and the valve handle are rotated back to the first rotational position by the spring biasing force.

[0090] Many different arrangements can be used (directly or using one or more intermediate attachment components) to rotationally secure the first portion 31 of the spring bracket 30 to the valve body 51. For example, the first portion 31 of the spring bracket 30 can be secured to the valve body 51 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. As an example, the first portion of the spring bracket can have an internal female threaded end that is sized and configured to threadably engage an external male threaded portion of a valve body bonnet portion.

[0091] Many different arrangements can be used (directly or using one or more intermediate attachment components) to rotationally secure the second end 22 of the torsion spring 20 to the guide rod interlock portion 77. For example, the second end 22 of the torsion spring 20 can be secured to the guide rod interlock portion 77 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. As an example, the second end of the torsion spring can be provided with an internal countersunk surface having an interlocking feature (e.g., a spline, groove, rough / high friction or knurled surface) that interlocks with a corresponding interlocking feature on a mating shoulder surface on the guide rod interlock portion.

[0092] The exemplary guide rod 70 has a sufficient length to accommodate the preload spring return cartridge 10 and the valve handle 90. Although the guide rod 70 can be formed as a single or unitary guide rod assembly having an integrally formed guide rod interlocking portion 77 and end 78, in some embodiments, the guide rod interlocking portion 77 and end 78 can be provided on a separate guide rod extension (schematically shown as 71) that can be fixed to a new or existing valve stem 55, for example, to provide a retrofit installation of a spring return handle with an existing rotary actuated valve. The guide rod extension can be fixed to the valve stem using a variety of arrangements including, for example, fasteners, clamps, keyed / splined connections, threaded engagement, and welding. In one such example, the guide rod extension can include a lower hole that receives the valve stem and a set screw that can be fixed with a flat portion of the valve stem to secure the guide rod extension to prevent rotation and axial movement on the valve stem.

[0093] In some embodiments, according to exemplary aspects of the present disclosure, the spring bracket may be a separate component assembled with the torsion spring and adapted to preload the torsion spring before being assembled with the valve, for example, to facilitate installation on the valve.

[0094] Figure 3 and Figure 4 An exemplary embodiment of a preloaded spring return cylinder 110 is shown including a torsion spring 120 and a spring bracket 130. A first (e.g., lower) end 121 of the torsion spring 120 is rotationally fixed to a first (e.g., lower) portion 131 of the spring bracket 130, and a second (e.g., upper) end 122 of the torsion spring is rotatably fixed to a second (e.g., upper) portion 132 of the spring bracket, such that the second end of the torsion spring can be rotated between a first rotational position and a second rotational position relative to the spring bracket and relative to the first end of the torsion spring by a torsional or twisting movement of a middle or mid-layer (e.g., coiled) portion 123 of the torsion spring. The second end 122 of the torsion spring 120 is fixed to the second portion 132 of the spring bracket 130, wherein the middle portion 123 of the torsion spring is in a preloaded or energized state, such that the second end of the torsion spring is maintained in the first rotational position without a rotational force being applied to the second end of the torsion spring.

[0095] Many different types of torsion spring elements may be used in the preload spring return cartridge, including, for example, one or more conventional helical spring assemblies. Figure 3 and Figure 4As shown, the torsion spring 120 may include an intermediate spring-loaded coiled portion 123 disposed between a first end sleeve or collar 121 and a second end sleeve or collar 122, which are secured to (e.g., fastened to, welded to, or integrally formed with) the spring-loaded portion. The first end collar 121 and the second end collar 122 may provide one or more attachment points to the spring bracket 130 and the guide rod 170, as described in more detail below. In the illustrated embodiment, the spring-loaded coiled portion 123 has a helical structure. In other embodiments, the spring-loaded portion may utilize other configurations, including, for example, with FIG. 8A to FIG. 9 The configuration shown in the embodiments is similar to a spiral or clock-type spring configuration, as described in more detail below.

[0096] like Figure 3 As shown, the torsion spring can be a single or integral component, wherein the first end collar 121 and the second end collar 122 are integrally formed with and extend from the helically wound intermediate spring loaded portion 123. As shown, the second end collar 122 can have an outer diameter that substantially matches the outer diameter of the intermediate spring loaded portion 123 of the torsion spring 120. As shown, the use of a machined torsion spring can allow for custom attachments, such as the end collar attachments described herein, thereby eliminating additional torsion bearing connections between the spring and the guide rod and handle. As a result, a single spring can apply "pure torque", meaning that the return spring does not apply a translational (side load) force. This can allow for the elimination of one or more external stabilization components that might otherwise be required.

[0097] Many different arrangements can be used (either directly or using one or more intermediate attachment components) to rotationally secure the first end 121 of the torsion spring 120 to the first portion 131 of the spring bracket 130. For example, the first end 121 of the torsion spring 120 can be secured to the first portion 131 of the spring bracket 130 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. In some arrangements, as shown in the illustrated embodiment, the first end collar 121 of the torsion spring 120 is provided with one or more fastener holes or apertures 124 that align with corresponding fastener holes or apertures 134 in the first portion 131 of the spring bracket 130, wherein fasteners 144 (e.g., pins, machine screws, rivets, etc.) are installed through these fastener holes or apertures to rotationally secure the first end of the torsion spring to the first portion of the spring bracket.

[0098] Many different arrangements can be used (either directly or using one or more intermediate attachment components) to rotatably secure the second end 122 of the torsion spring 120 to the second portion 132 of the spring bracket 130. For example, the second end 122 of the torsion spring 120 can be secured to the second portion 132 of the spring bracket 130 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. In some arrangements, as shown in the illustrated embodiment, the second end collar 122 of the torsion spring 120 is provided with one or more fastener holes or apertures 125 that align with corresponding cutouts or slots 135 in the second portion 132 of the spring bracket 130, wherein fasteners 145 (e.g., pins, machine screws, rivets, etc.) are installed through these cutouts or slots to rotatably secure the second end of the torsion spring to the second portion of the spring bracket. The size of the slot 135 can be designed to limit the range of rotational movement of the torsion spring second end 122 relative to the spring bracket 130 (and the valve to which the spring bracket is attached) (e.g., approximately 90° for a quarter-turn valve) to provide the torsion spring second end (and the guide rod to which the spring second end is attached) with first (spring return) and second (user actuation) extreme positions corresponding to the engagement of the fastener 145 and the end of the slot 135.

[0099] In an exemplary method of assembling the preloaded spring return cylinder 110, the torsion spring 120 is inserted or sleeved within the spring bracket 130, wherein the fastener hole 124 in the first end collar 121 is aligned with the fastener hole 134 in the spring bracket first portion 131. The spring pin 144 (or other suitable fastener) is installed through the aligned fastener holes 124, 134 to rotationally fix the first portion 121 of the torsion spring 120 to the first portion 131 of the spring bracket 130. The second end collar 122 of the torsion spring 120 is rotated (e.g., counterclockwise) to align the fastener hole 125 in the second end collar 122 of the torsion spring with the slot 135 in the second portion 132 of the spring bracket. A locking pin 145 (or other suitable fastener) is installed in the torsion spring second end fastener hole 124 to extend through the spring bracket slot 135 so that the locking pin is spring biased into engagement with the first end of the slot to maintain the preloaded or energized state of the torsion spring coiled portion 123 in the first rotational position of the second end collar 122.

[0100] Figure 5 and Figures 6A to 6DThe preloaded spring return cartridge 110 is shown assembled with an exemplary rotary valve 150 and a valve handle 190 for user actuation of the valve. The valve 150 includes a valve body 151 defining an internal cavity 152 that holds a valve element 156 connected or fixed to (e.g., integral with or assembled with) a guide rod 170. Although many different types of valve elements may be utilized, in the illustrated embodiment, the valve element includes a ball portion 156 that includes a ball orifice 154 that is misaligned with a first end port 161 and a second end port 162 in the valve body 151 in a closed position to prevent fluid from passing through the valve 150, and is aligned with the valve body end ports in an open position to allow fluid to pass through the valve.

[0101] The internal cavity 152 extends to the upper valve cover portion 153 of the valve body 151, and the guide rod 170 extends from the valve cover portion. The guide rod 170 can rotate between a first position (e.g., a closed position, a reduced flow position, a first switch position) and a second position (e.g., an open position, an increased flow position, a second switch position) to adjust the position of the valve element 156.

[0102] In the illustrated embodiment, the valve 150 includes a valve seat and guide stem seal 165 in the valve cavity 152 to seal the valve to prevent valve seat and guide stem leakage. In other embodiments, other sealing arrangements may be utilized. In addition, while the illustrated embodiment includes a valve closing or shutoff valve element, other types of valve elements may also be used, including, for example, flow regulating or flow switching valve elements.

[0103] The bonnet portion 153 of the valve body 151 includes an internally threaded portion 163 for retaining the assembly of a guide nut 164 with the valve body of a guide rod 170. The guide rod 170 includes an upper portion that extends beyond the bonnet portion 153 for attachment to the spring return handle assembly 110, as described below.

[0104] As shown, the first portion 131 of the spring bracket 130 is rotationally fixed to the valve body 151 (e.g., fixed to the valve cover portion 153 of the valve body), and the second end 122 of the torsion spring 120 is rotationally fixed to the interlocking portion 177 of the guide rod 170. The valve handle 190 is rotationally fixed to the end 178 of the guide rod 170 (e.g., using a set screw 176 installed through the valve handle 190 and screwed on the flat portion of the guide rod end 178) to allow a user to overcome the biasing force of the preloaded torsion spring 120 to rotate the guide rod and the second end 122 of the torsion spring from the first rotational position to the second rotational position, for example, by grasping and rotating the valve handle. When the valve handle 190 is released, the second end 122 of the torsion spring, the guide rod 170 and the valve handle are rotated back to the first rotational position by the spring biasing force.

[0105] Many different arrangements can be used (either directly or using one or more intermediate attachment components) to rotationally secure the first portion 131 of the spring bracket 130 to the valve body 151. For example, the first portion 131 of the spring bracket 130 can be secured to the valve body 151 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. In some arrangements, as shown in the illustrated embodiment, the first portion 131 of the spring bracket 130 includes an internal female threaded portion 136 that is sized and configured to threadably engage an external male threaded portion 166 of the valve body bonnet portion 153. As shown, the first portion 131 of the spring bracket 130 can be provided with a plurality of flat portions 137, for example, to facilitate threaded assembly (or disassembly) of the spring bracket with the valve body 151 using a torque wrench or other such tool.

[0106] Many different arrangements can be used (either directly or using one or more intermediate attachment components) to rotationally secure the second end 122 of the torsion spring 120 to the guide rod interlock portion 177. For example, the second end 122 of the torsion spring 120 can include a spring interlock portion 127 that is secured to the guide rod interlock portion 177 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. In some arrangements, as shown in the illustrated embodiment, the second end collar 122 of the torsion spring 120 includes an inner countersunk surface 129 that includes interlocking features (e.g., splines, grooves, rough / high friction or knurled surfaces) that interlock with corresponding interlocking features on a mating shoulder surface 179 on the guide rod interlock portion 177. As an example, laser engraved or machined ridges can be provided on the mating countersunk surface 129 and the shoulder surface 179 to provide an interlocking engagement. These interlocking features can allow the guide rod 170 to interlock with the spring second end 122 in many or nearly any relative rotational positions, such as to place a valve handle (whose orientation on the valve stem may be limited) in a desired spring return orientation on the valve. The hexagonal nut 167 can be threaded onto the guide rod end 178 and screwed onto the second end collar 122 of the torsion spring 120 to maintain the interlocking engagement between the mating countersunk surface 129 and the shoulder surface 179. As shown, the countersunk surface 129 and the shoulder surface 179 can be, but need not be, generally frustoconical, for example, to facilitate secure interlocking engagement between the surfaces when the hexagonal nut 167 is fully tightened.

[0107] The exemplary guide rod 170 has a sufficient length to accommodate the preloaded spring return cylinder 110 and the valve handle 190. Although the guide rod 170 can be formed as a single or unitary guide rod assembly having an integrally formed guide rod interlock portion 177 and end 178, in some arrangements (including the illustrated embodiment), the guide rod interlock portion 177 and end 178 are provided on a separate guide rod extension 171 that can be secured to a new or existing valve stem 155, for example, to provide a retrofit installation of a spring return handle with an existing rotary actuated valve. The guide rod extension 171 can be secured to an existing valve stem using a variety of arrangements including, for example, fasteners, clamps, keyed / splined connections, threaded engagement, and welding. In some arrangements, as shown in the illustrated embodiment, the guide rod extension 171 includes a lower hole 172 that receives the valve stem 155 and a set screw 173 that can be secured with the flat portion 168 of the valve stem 155. As shown in FIG. Fig. 6A , Fig. 7A and Figure 7B As shown, the lower hole 172, 172a can be configured as a keyed shape (e.g., triangular, semicircular) to interlockingly receive the flat portion 168 of the valve stem 155, for example, to more rigidly or firmly attach the guide extension 171, 171a to the valve stem 155. The guide extension 171 can include a larger diameter lower portion located below the shoulder surface 179 and a smaller diameter upper portion located above the shoulder surface to closely match the larger inner diameter portion and the smaller inner diameter portion of the central hole of the spring return cylinder 110.

[0108] In an exemplary method of installing the preloaded spring return cartridge 110 and the valve handle 190 onto the valve 150, as shown in FIG. Figure 5 and FIG. 6A to FIG. 6D As shown, the guide rod extension 171 is assembled with the valve stem 155, wherein the flat portion 168 of the valve stem 155 is inserted into the lower hole 172 of the guide rod extension ( Fig. 6A ), and the set screw 173 (or another suitable fastener) is threaded onto the valve stem flat portion 168. When the valve stem 155 is in the desired "spring return" rotational position, the guide extension 171 is inserted through the torsion spring 120 ( Figure 6B ) so that the shoulder surface 179 of the guide rod extension is tightly engaged with the countersunk hole surface 129 of the second end collar 122 of the torsion spring. The hexagonal nut 167 is threaded onto the guide rod extension interlocking portion 177 and screwed onto the second end collar 122 of the torsion spring 120 ( Figure 6C ) to maintain the interlocking engagement between the mating countersunk surface 129 and the shoulder surface 179. The valve handle 190 is assembled with the flat portion of the guide stem end 178 using a set screw 176 installed through the valve handle 190 and threaded onto the flat portion of the guide stem extension end 178 ( Fig.6D ).

[0109] In some embodiments, according to exemplary aspects of the present disclosure, the spring bracket can be integrally formed with the torsion spring (e.g., as a surrounding sleeve or housing) and adapted to preload the torsion spring prior to assembly with the valve, e.g., to facilitate installation on the valve. For example, such an arrangement can provide a smaller and more compact design.

[0110] Fig. 8A , Figure 8B and Figure 8C An exemplary embodiment of a preloaded spring return cartridge 210 is shown including a spring return cartridge element 211 having a helical or clock-type torsion spring 220 integrally formed (e.g., by machining or additive manufacturing) with a spring carrier 230. A first (e.g., radially outer) end 221 of the torsion spring 220 is rotationally fixed to a first (e.g., upper inner diameter wall) portion 231 of the spring carrier 230, and a second (e.g., radially inner) end 222 of the torsion spring is rotatably fixed to a second (e.g., lower offset inner diameter) portion 232 of the spring carrier such that the second end of the torsion spring can be rotated relative to the spring carrier and relative to the first end of the torsion spring between a first rotational position and a second rotational position by twisting or twisting movement of a middle or mid-layer (e.g., helically coiled) portion 223 of the torsion spring. The second end 222 of the torsion spring 220 can be rotationally fixed or engaged with the second portion 232 of the spring bracket 230, wherein the middle portion 223 of the torsion spring is in a preloaded or energized state so that the second end of the torsion spring is maintained in a first rotational position without applying a rotational force to the second end of the torsion spring.

[0111] Many different types of torsion spring elements may be used in the preload spring return cartridge, including, for example, one or more conventional helical spring assemblies. Fig. 8A and Figure 8B As shown, the torsion spring 220 may include an intermediate spring-loaded coiled portion 223 disposed between a first end outer radial origin 221 integrally formed with and extending radially inwardly from an upper inner diameter wall portion 231 of the spring carrier 230 and a center axis 222 integrally formed with the coiled portion 223. The center axis 222 may provide one or more attachment points to a valve stem and / or guide extension, as described in more detail below. The torsion spring 220 integrally formed with the spring carrier 230 and using a plurality of evenly spaced helical spring origins 221 (e.g., three origins as shown) may facilitate the application of "pure torque," meaning that the torsion spring does not apply a translational (side load) force. This may allow for the elimination of one or more external stabilization components that may otherwise be required.

[0112] The coil spring configuration of the torsion spring 220 can be adapted to provide appropriate torque output to the spring-loaded handle and valve stem, for example by selecting the height of the spring (greater height represents greater torque output, smaller height represents less torque output) or the number of spring activations (greater number of activations represents greater torque output, smaller number of activations represents less torque output).

[0113] Many different arrangements may be used (either directly or using one or more intermediate attachment assemblies) to rotatably secure the second inner radial shaft portion 222 of the torsion spring 220 to the second lower inner diameter offset portion 232 of the spring bracket 230. For example, Figure 8B and Figure 8C As shown, the shaft 222 of the torsion spring 220 may be provided with radially outwardly extending bearing portions 226a, 226b defining one or more arcuate recesses 228, and the lower inner diameter offset portion 232 of the spring bracket 230 may be provided with one or more radially inwardly extending protrusions 235 received in the corresponding arcuate recesses. FIG. 8A to FIG. 9 In the embodiment shown in FIG. 2 , the protrusion 235 can be configured as a pin that is press-fit or otherwise installed through a hole 238 in the lower offset portion 232. In other embodiments, the protrusion can be integrally formed with the spring bracket, as described in more detail below.

[0114] The recess 228 can be sized to limit the range of rotational movement of the torsion spring second end 222 relative to the spring bracket 230 (and the valve to which the spring bracket is attached) (e.g., approximately 90° for a quarter-turn valve) to provide the torsion spring second end (and the guide rod to which the spring second end is attached) with first (spring return) and second (user actuation) extreme positions corresponding to the engagement of the protrusion 235 with the recessed bearing portions 226a, 226b. In other embodiments (e.g., similar to Figures 3 to 6D In an embodiment of the present invention, the inner diameter wall of the spring bracket may be provided with an arcuate slot or recess which receives a radial protrusion from the central axis to limit the rotational movement range of the second end of the torsion spring relative to the spring bracket.

[0115] In an exemplary method of preloading the spring return cartridge 210, the shaft 222 is rotated relative to the spring carrier 230 (e.g., at least about 90° from an unloaded orientation) to a first rotational limit position in which the torsion spring helical portion 223 is in a spring-loaded state (e.g., at or slightly beyond the first rotational limit position). One or more pins 235 are installed (e.g., press-fit) through radially extending holes 238 in the lower inner diameter offset portion 232 of the spring carrier 230. The spring-loaded intermediate portion 223 of the torsion spring 230 biases the first rotational limit limiting bearing portion 226a of the central shaft 222 against the installed pins 235 to maintain the preload spring shaft 222 in the first rotational limit position. When a rotational force or torque is applied to the shaft 222 to overcome the torsion spring biasing force, the engagement of the second rotational limit limiting bearing portion 226b against the installed pins 235 limits the rotation of the shaft to the second rotational limit position.

[0116] In some embodiments, the preload interlock feature of the spring return barrel may be integrally formed with the spring carrier and may be elastically deformable, such as during preload rotation of the spring barrel shaft, to radially align with the arcuate recess when the spring carrier barrel element is preloaded. Fig. 10A , Fig. 10B and Fig. 10C A bottom view of an exemplary spring return cartridge element 311 is shown having a fin or other such protrusion 335 extending radially inwardly from a spring bracket lower offset portion 332 and radially outwardly extending bearing portions 326a, 326b defining an arcuate recess 328. To preload the spring return cartridge element 311, the central shaft 322 is moved from an unloaded state ( Fig. 10A ) rotation (i.e., in FIG. 10A to FIG. 10C Clockwise rotation in the view shown) to the first rotation limit position ( Fig. 10B ), wherein the protrusion 335 engages with the bearing portions 326a, 326b to elastically deform without being radially aligned with the arcuate recess 328, and then elastically snaps inwardly into the arcuate recess when the shaft is in the first rotation limit position. In the first rotation limit position, the end 335a of the protrusion 335 engages with the bearing portions 326a, 326b to fix the spring return cylinder element in the preloaded first rotation limit position. The shaft 322 can overcome the torsional force of the spring-loaded coiled portion 323 and further rotate from the first rotation limit position to the second rotation limit position ( Fig. 10C ). Although the torsion limit of the torsion spring coiled portion 323 can provide a positive stop in the second rotational limit position, in other embodiments, other spring return cylinders, handles, and / or valve elements can define a positive stop in the second rotational limit position.

[0117] In other embodiments, the preload interlock feature of the spring return barrel may be integrally formed with the central shaft and may be elastically deformable, for example during preload rotation of the spring barrel shaft, to radially align with the inner peripheral recess of the spring bracket when the spring bracket barrel element is preloaded. Fig.11 A cross-sectional perspective view of an exemplary spring return cartridge element 411 is shown having fins or other such projections 426 extending radially outward from the shaft 422 and bearing portions 435a, 435b, 435c extending radially inward from the spring bracket lower offset portion 432 to define an arcuate recess 438. To preload the spring return cartridge element 411, the central shaft 422 is moved from an unloaded state ( Fig.11A ) rotation (i.e., in FIG. 11A to FIG. 11C Clockwise rotation in the view shown) to the first rotation limit position ( Fig. 11B ), wherein the protrusion 426 engages with the bearing portion 435 to bend or deform elastically inwardly and does not radially engage with the arc-shaped recess 438, and then elastically snaps outward into the arc-shaped recess when the shaft is in the first rotation limit position. In the first rotation limit position, the end 426a of the protrusion 426 engages with the bearing portion 435 to fix the spring return cylinder element in the preloaded first rotation limit position. The shaft 422 can overcome the torsional force of the spring-loaded coiled portion 423 and further rotate from the first rotation limit position to the second rotation limit position ( Fig. 11C ). Although the torsion limit of the torsion spring coiled portion 423 can provide a positive stop in the second rotational limit position, in other embodiments, other spring return cylinders, handles, and / or valve elements can define a positive stop in the second rotational limit position.

[0118] Fig. 9 Shows FIG. 8A to FIG. 8C The preloaded spring return cartridge 210 is assembled with the exemplary rotary valve 250 and the valve handle 290 for the user to actuate the valve. The valve 250 and the valve handle 290 can similarly use one or more of the following features and FIG. 10A to FIG. 11C The spring return cylinder elements 311 and 411 are assembled together, and any of the spring return cylinder and the spring return cylinder element can be assembled with various valves and valve handles.

[0119] The valve 250 includes a valve body 251 defining an interior cavity 252 that holds a valve element 256 connected or fixed to (e.g., integral or assembled with) a valve stem 255. Although many different types of valve elements may be utilized, in the illustrated embodiment, the valve element includes a ball portion 256 that includes a ball orifice 254 that is misaligned with first and second end ports 261, 262 in the valve body 251 in a closed position to prevent fluid from passing through the valve 250, and is aligned with the valve body end ports in an open position to allow fluid to pass through the valve.

[0120] The internal cavity 252 extends to the upper valve cover portion 253 of the valve body 251, and the valve stem 255 extends from the valve cover portion. The valve stem 255 can rotate between a first position (e.g., a closed position, a reduced flow position, a first switch position) and a second position (e.g., an open position, an increased flow position, a second switch position) to adjust the position of the valve element 256.

[0121] In the illustrated embodiment, the valve 250 includes a valve seat and guide stem seal 265 in the valve cavity 252 to seal the valve to prevent valve seat and guide stem leakage. In other embodiments, other sealing arrangements may be utilized. In addition, while the illustrated embodiment includes a valve closing or shutoff valve element, other types of valve elements may also be used, including, for example, flow regulating or flow switching valve elements.

[0122] The bonnet portion 253 of the valve body 251 includes an internally threaded portion 263 of a guide nut 264 for retaining the assembly of the valve stem 255 with the valve body. The valve stem 255 includes an upper portion that extends beyond the bonnet portion 253 for attachment to the spring return handle assembly 210, as described below. Although the valve stem can extend through the spring return barrel to attach directly to the valve handle, in the illustrated embodiment, the guide extension 271 is attached to the valve stem 255 (e.g., as shown, through the hole portions 229a, 229b of the shaft 222) to form an extended valve stem assembly, as described in more detail below.

[0123] As shown, the first portion 231 of the spring bracket 230 is rotationally fixed to the valve body 251 (e.g., fixed to the valve cover portion 253 of the valve body), and the second end or shaft 222 of the torsion spring 220 is rotationally fixed to the interlocking portion or lower end 277 of the guide rod extension 271. The valve handle 290 is rotationally fixed to the upper end 278 of the guide rod extension 271 (e.g., using a set screw 276 installed through the valve handle 290 and screwed on the flat portion of the upper end 278 of the guide rod extension) to allow a user to overcome the biasing force of the preloaded torsion spring 220 to rotate the valve stem and the second end or shaft 222 of the torsion spring from the first rotational position to the second rotational position, for example, by grasping and rotating the valve handle. When the valve handle 290 is released, the shaft 222, the guide rod extension 271 and the valve handle 290 are rotated back to the first rotational position by the spring biasing force.

[0124] Many different arrangements can be used (directly or using one or more intermediate attachment components) to rotationally secure the first portion 231 of the spring bracket 230 to the valve body 251. For example, the first portion 231 of the spring bracket 230 can be secured to the valve body 251 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. In some arrangements, as shown in the illustrated embodiment, the first portion 231 of the spring bracket 230 extends to a lower female threaded collar portion 236 that is sized and configured to threadably engage with an outer male threaded portion 266 of the valve body bonnet portion 253. As shown, the collar portion 236 of the spring bracket 230 can be provided with a plurality of flat portions 237, for example, to facilitate the use of a torque wrench or other such tool to screw the spring bracket to the valve body 251. A set screw 225 can be installed through a hole 239 in the female threaded collar portion 236 to secure the collar portion to prevent accidental threaded rotation of the spring return cylinder 210 on the valve body 251. The set screw 225 can be provided with a soft (e.g., brass) tip to minimize damage to the valve cover threads. In other embodiments, other configurations (including, for example, split ring clamps or other clamping features assembled or integrally formed with the spring carrier) can be used to secure the spring return cylinder to prevent it from rotating.

[0125] Many different arrangements can be used (directly or using one or more intermediate attachment components) to rotationally secure the shaft 222 of the torsion spring 220 to the guide rod extension lower end 277. For example, the shaft 222 of the torsion spring 220 can include a spring interlocking portion that is secured to the guide rod extension lower end 277 using one or more fasteners, clamps, keyed / splined connections, threaded engagements, and / or welded portions. In some arrangements, as shown in the illustrated embodiment, the shaft 222 of the torsion spring 220 includes an inner upper bore portion 229a having an interlocking feature (e.g., splines, grooves, rough / high friction or knurled surface) that interlocks with an outer circumferential surface 279 on the guide rod extension lower end 277. As an example, circumferentially spaced ribs or projections 224 can be provided in the inner bore 229a to facilitate a rotationally fixed press-fit engagement between the shaft 222 and the guide rod extension 271. These interlocking features can allow the guide rod extension 271 to interlock with the shaft 222 in many or nearly any relative rotational positions, such as to place a valve handle (whose orientation on the valve stem may be restricted) in a desired spring return orientation on the valve. In other embodiments (not shown), the guide rod extension can be rotationally fixed to the shaft by complementary keyed cross-sectional shapes of the guide rod extension end and the bore portion on the shaft. In yet other exemplary embodiments, the guide rod extension can be integrally formed with the spring bracket shaft, thereby eliminating the need for an attachment device.

[0126] To protect the torsion spring 220 from moisture or other contaminants, a cover plate 240 may be secured over the upper end of the torsion spring and spring bracket 230. In the example shown, the cover plate 240 includes a central hole 241 that receives the lower end 277 of the guide rod extension 271, wherein the shoulder portion 275 of the guide rod extension engages the cover plate to hold the cover plate against the upper end of the torsion spring and spring bracket. The cover plate 240 may be made of, for example, a plastic material to reduce friction and noise generated on the upper end of the torsion spring and spring bracket when rotating. The cover plate may be provided with a peripheral wall or lip that overhangs the upper end of the spring bracket to, for example, further prevent the ingress of contaminants.

[0127] The exemplary guide rod arrangement 270 has a sufficient length to accommodate the preloaded spring return cartridge 210 and the valve handle 290. Although the valve stem can be formed as a single or unitary valve stem assembly having an integrally formed valve stem interlocking portion and end (not shown), in some arrangements (including the illustrated embodiment), the guide rod extension lower end 277 and upper end 278 are provided on a separate guide rod extension 271 that can be fixed to a new or existing valve stem 255 (e.g., by attaching to the shaft 222), for example, to provide a retrofit installation of a spring return handle with an existing rotary actuated valve. The guide rod extension 271 can be fixed to an existing valve stem using a variety of arrangements including, for example, fasteners, clamps, keyed / splined connections, threaded engagement, and welding. In some arrangements, as shown in the illustrated embodiment, the guide rod extension 271 is fixed to the upper bore portion 229a of the shaft 222, and the valve stem 255 is fixed to the lower bore portion 229b of the shaft. As shown, the lower hole portion 229b can be configured as a keyed shape (e.g., triangular, semicircular, single or double flat holes) to interlockingly receive the complementary shaped flat portion 268 of the valve stem 255, for example to more rigidly or firmly rotationally attach the shaft 222 to the valve stem 255. The use of a close-fitting complementary shaped flat guide 268 and the shaft lower hole portion 229b can eliminate play in the rotation of the handle without the need for set screws or other fasteners.

[0128] To assemble the spring return handle device, for example, for later assembly with a rotary actuated valve, the guide rod extension 271 is installed in the upper bore portion 229a of the spring return cylinder shaft 222, for example, by press-fitting the guide rod extension lower end 277 into the ribbed upper bore portion. The valve handle 290 is assembled with the upper end portion 278 of the guide rod extension 271, for example, by screwing a set screw set 276 installed through the valve handle 290 onto the flat portion of the upper end portion of the guide rod extension. Although the guide rod extension 271 and the valve handle 290 can be assembled to the spring return cylinder 210 after preloading, in other embodiments, the guide rod extension and the valve handle can be assembled with the spring return cylinder before preloading, so that, for example, the valve handle can be used to apply a preload torque force to the shaft 222.

[0129] In an exemplary method of installing the spring return handle device on the valve 250, the upper flat portion 268 of the valve stem 255 is partially inserted into the lower guide rod hole portion 229b of the spring return cylinder shaft 222, and the spring bracket 230 is threadedly assembled with the valve body bonnet portion 253, such as by engaging the flat portion 237 of the spring bracket collar portion 236 using a wrench or other tool. During this threaded installation, the valve stem 255 is rotated within the valve body 251. Once the spring bracket 230 has sufficient threaded engagement with the valve body bonnet portion 253, the spring bracket and valve stem 255 are rotationally adjusted to the desired "spring return" rotational position (e.g., the fully closed position of the valve stem relative to the valve body 251), and the set screw 225 in the spring bracket collar portion 236 is threaded on the valve body bonnet portion to secure the spring return cylinder to prevent further rotation on the valve body 251. In some implementations, after the spring return cartridge is installed on the valve 250 , the guide stem extension 271 and the valve handle 290 may be assembled with the spring return cartridge 230 .

[0130] The overall shape and structural configuration of the integral spring return cylinder element 211, 311, 411 may make the assembly difficult to manufacture using conventional machining, molding or casting techniques. According to aspects of the present disclosure, the spring return cylinder element may be manufactured using additive manufacturing (e.g., 3D printing) to produce an integral assembly having a desired integrally formed shaft, spring and bracket configuration. Examples of additive manufacturing techniques that may be utilized include, for example: laser powder bed fusion (direct metal laser sintering or "DMLS", selective laser sintering / melting or "SLS / SLM" or layered additive manufacturing or "LAM"), electron beam powder bed fusion (electron beam melting or "EBM"), ultrasonic additive manufacturing ("UAM") or direct energy deposition (laser powder deposition or "LPD", laser wire deposition or "LWD", laser engineered net shaping or "LENS", electron beam wire deposition), sintering-based additive manufacturing, such as binder jetting technology (BJT), mold slurry deposition (MSD), bonded metal extrusion (BME) and nanoparticle jetting technology (NPJ). Providing the spring return cartridge element as a single integral component can eliminate assembly costs, reduce component wear, reduce adverse effects of thermal cycling, improve corrosion behavior (Galvani effect, crevice, stress corrosion cracking) and reduce manufacturing lead time. In addition, manufacturing using additive manufacturing can reduce the amount of raw materials used and can reduce the size and weight of the finished component. The spring return cartridge element can be made of any suitable material (e.g., stainless steel).

[0131] As shown, the additively manufactured spring return cylinder element 211, 311, 411 provides a spring bracket, a guide rod and a torsion spring as a single or integral component for assembly with a rotary actuated valve. In other embodiments, any one or more additional or alternative features can be incorporated into the overall design by additive manufacturing to consolidate parts and / or minimize assembly, including, for example, any one or more of an interlocking protrusion, a fastening element, a cover plate, a guide rod extension, a guide rod fixing nut and a valve stem.

[0132] The spring return cylinder element 211, 311, 411 may include structural features and configurations configured to facilitate manufacturing using additive manufacturing techniques. For example, the shaft bearing portion and the transition surface between the upper wall portion and the offset portion may be provided with a draft angle (e.g., a 45° surface) to allow printing without support material. As another example, a spiral or clock-type torsion spring configuration may be selected to facilitate printability compared to a helical spring configuration. In other embodiments, different spring loading configurations may be utilized, including, for example, with Figures 3 to 5 The configuration shown in the embodiment is similar to the helical torsion spring configuration.

[0133] The inventive aspects have been described with reference to exemplary embodiments. Modifications and alterations will occur to others upon reading and understanding this specification. All such modifications and alterations are intended to be included as long as they are within the scope of the appended claims or their equivalents.

Claims

1. A spring return cylinder for a rotary actuated valve, the spring return cylinder comprising: a torsion spring having a spring-loaded intermediate portion extending between a first end and a second end; as well as a spring bracket, the spring bracket being sleeved with the torsion spring and having: a first portion, the first portion being rotationally fixed to the first end portion of the torsion spring; and a second portion rotatably coupled to the second end portion of the torsion spring so that the second end portion of the torsion spring can rotate between a first rotational limit position and a second rotational limit position relative to the spring bracket and relative to the first end portion of the torsion spring, wherein the middle portion of the torsion spring biases the second end portion of the torsion spring to the first rotational limit position and maintains a spring-loaded state in the first rotational limit position.

2. The spring return cylinder of claim 1 , wherein the first end of the torsion spring includes at least one fastener hole, the at least one fastener hole being aligned with a corresponding fastener hole in the first portion of the spring bracket, wherein a fastener is installed through the aligned fastener hole to rotationally secure the first end of the torsion spring to the first portion of the spring bracket.

3. The spring return cylinder of any one of claims 1 and 2, wherein the second end of the torsion spring includes at least one fastener hole, the at least one fastener hole being aligned with a corresponding slot in the second portion of the spring bracket, wherein a fastener is installed in the fastener hole and extends through the slot to rotatably secure the second end of the torsion spring to the second portion of the spring bracket.

4. The spring return cartridge of any one of claims 1 to 3, wherein the first end of the torsion spring includes a first end collar, the first end collar providing one or more attachment points to the first portion of the spring bracket.

5. The spring return cylinder of claim 4, wherein the first end collar is integrally formed with the torsion spring intermediate portion.

6. The spring return cartridge of any one of claims 1 to 5, wherein the second end of the torsion spring includes a second end collar, the second end collar providing one or more attachment points to the second portion of the spring bracket.

7. The spring return cylinder of claim 6, wherein the second end collar is integrally formed with the torsion spring intermediate portion.

8. The spring return cylinder according to any one of claims 1 to 7, wherein the torsion spring is sleeved in the spring bracket.

9. The spring return cartridge according to any one of claims 1 to 8, wherein the spring loaded intermediate portion and the first and second ends of the torsion spring are formed as an integral component.

10. The spring return cylinder according to any one of claims 1 to 9, wherein the spring bracket is assembled with the torsion spring.

11. The spring return cylinder according to any one of claims 1 to 10, wherein the torsion spring comprises a helical spring.

12. The spring return cylinder according to any one of claims 1 to 10, wherein the torsion spring comprises a coil spring.

13. The spring return cylinder according to any one of claims 1 to 10, wherein the first portion of the spring bracket comprises a lower end portion of the spring bracket, and the second portion of the spring bracket comprises an upper end portion of the spring bracket.

14. The spring return cylinder of claim 1, wherein the spring bracket is formed integrally with the torsion spring.

15. The spring return cylinder of any one of claims 1 and 14, wherein the torsion spring comprises a coil spring, wherein the first end of the torsion spring comprises an outer radial portion of the coil spring, and the second end of the torsion spring comprises an inner radial portion of the coil spring.

16. The spring return cartridge of any one of claims 1 and 14 to 15, wherein the second end of the torsion spring includes a shaft surrounded by the spring loaded middle portion of the torsion spring.

17. The spring return cylinder of claim 16, wherein the spring bracket includes an inner circumferential first interlocking portion, and the shaft includes an outer circumferential second interlocking portion, the outer circumferential second interlocking portion being radially aligned with the first interlocking portion so that the first interlocking portion and the second interlocking portion engage with each other to define the first rotation limit position and the second rotation limit position of the second end portion of the torsion spring.

18. The spring return cylinder of claim 17, wherein the first interlocking portion includes at least one radially inwardly extending protrusion, and the second interlocking portion includes at least one arcuate recess receiving the at least one radially inwardly extending protrusion.

19. The spring return cylinder of claim 18, wherein the at least one radially inwardly extending projection comprises a pin that is mounted through a hole in the spring bracket second portion.

20. The spring return cylinder of claim 18, wherein the at least one radially inwardly extending protrusion is integrally formed with the spring bracket second portion.

21. The spring return cylinder of claim 20, wherein the at least one radially inwardly extending protrusion is elastically deformable for interlocking engagement with the at least one arcuate recess.

22. The spring return cylinder of claim 17, wherein the first interlocking portion comprises at least one radially outwardly extending protrusion, and the second interlocking portion comprises at least one arcuate recess receiving the at least one radially outwardly extending protrusion.

23. The spring return cylinder of claim 22, wherein the at least one radially outwardly extending protrusion is integrally formed with the shaft.

24. The spring return cylinder of claim 23, wherein the at least one radially outwardly extending protrusion is elastically deformable for interlocking engagement with the at least one arcuate recess.

25. A spring return cartridge as claimed in any one of claims 16 to 24, wherein the shaft comprises a lower bore portion for receiving a valve stem of the rotary actuated valve when the spring return cartridge is mounted on the rotary actuated valve.

26. The spring return cartridge of any one of claims 16 to 25, wherein the shaft comprises an upper stem extension configured to be attached to a valve handle.

27. The spring return cylinder of claim 26, wherein the upper guide extension is integrally formed with the shaft.

28. The spring return cartridge of any one of claims 16 to 25, wherein the shaft includes an upper bore portion for receiving a guide stem extension, the guide stem extension being configured to be attached to a valve handle.

29. The spring return cylinder of claim 28, further comprising a guide rod extension mounted in the upper bore portion.

30. The spring return cylinder of claim 29, further comprising a cover plate fixed to the shaft and covering the spring bracket and an upper end of the torsion spring.

31. A spring return cylinder for a rotary actuated valve, the spring return cylinder comprising: a torsion spring having an outer radial first end and an inner radial second end; a spring bracket surrounding the torsion spring and rotationally fixed to the outer radial first end; and a shaft surrounded by the torsion spring and rotationally fixed to the inner radial second end; The spring bracket is rotatably coupled to the shaft so that the shaft can rotate relative to the spring bracket between a first rotation limit position and a second rotation limit position, wherein the torsion spring biases the shaft to the first rotation limit position and maintains a spring-loaded state in the first rotation limit position.

32. The spring return cylinder of claim 31, wherein the spring bracket is integrally formed with the torsion spring.

33. The spring return cylinder of any one of claims 31 and 32, wherein the shaft is integrally formed with the torsion spring.

34. A spring return cylinder as described in any one of claims 31 to 33, wherein the spring bracket includes an inner peripheral first interlocking portion, and the shaft includes an outer peripheral second interlocking portion, and the outer peripheral second interlocking portion is radially aligned with the first interlocking portion, so that the first interlocking portion and the second interlocking portion are engaged with each other to define the first rotation limit position and the second rotation limit position of the second end of the torsion spring.

35. A spring return cylinder as described in claim 34, wherein one of the first interlocking part and the second interlocking part includes at least one radially extending protrusion, and the other of the first interlocking part and the second interlocking part includes at least one arc-shaped recess for receiving the at least one radially extending protrusion, and the shape of the at least one arc-shaped recess is designed to define the first rotation limit position and the second rotation limit position.

36. The spring return cylinder of claim 35, wherein the at least one radially extending protrusion comprises a pin mounted through a hole in at least one of the spring bracket and the shaft.

37. The spring return cylinder of claim 35, wherein the at least one radially extending protrusion is integrally formed with the spring bracket.

38. The spring return cylinder of claim 37, wherein the at least one radially outwardly extending protrusion is resiliently deformable for interlocking engagement with the at least one arcuate recess.

39. The spring return cylinder of any one of claims 35 to 38, wherein the at least one radially extending protrusion extends radially inwardly from the spring bracket and the at least one arcuate recess is provided on an outer circumference of the shaft.

40. The spring return cylinder of any one of claims 35 to 38, wherein the at least one radially extending protrusion extends radially outward from the shaft and the at least one arcuate recess is provided on an inner circumference of the spring bracket.

41. A spring return cartridge as claimed in any one of claims 31 to 40, wherein the shaft includes a lower bore portion for receiving a valve stem of the rotary actuated valve when the spring return cartridge is mounted on the rotary actuated valve.

42. A spring return cartridge as claimed in any one of claims 31 to 41, wherein the shaft comprises an upper stem extension configured to be attached to a valve handle.

43. The spring return cylinder of claim 42, wherein the upper guide extension is integrally formed with the shaft.

44. The spring return cartridge of any one of claims 31 to 41, wherein the shaft includes an upper bore portion for receiving a guide stem extension, the guide stem extension being configured to be attached to a valve handle.

45. The spring return cylinder of claim 44, further comprising a guide rod extension mounted in the upper bore portion.

46. ​​The spring return cylinder of claim 45, wherein at least one of the guide rod extension and the upper bore portion includes a ribbed surface to provide a press fit retention of the guide rod extension to the shaft.

47. The spring return cylinder of claim 46, further comprising a cover plate fixed to the shaft and covering the spring bracket and an upper end of the torsion spring.

48. A spring return cartridge as claimed in any one of claims 31 to 47, wherein the spring bracket, the torsion spring and the shaft are formed as an integral assembly.

49. The spring return cartridge of any one of claims 31 to 48, wherein the spring bracket, the torsion spring and the shaft are formed using additive manufacturing.

50. A spring return handle device for assembly with a valve, the spring return handle device comprising: A spring return cylinder, the spring return cylinder comprising: a torsion spring having a spring-loaded middle portion extending between a first end and a second end; and a spring bracket, the spring bracket housing the torsion spring and having a first portion and a second portion, the first portion being rotationally fixed to the first end of the torsion spring and attachable to a valve body of the valve, the second portion being rotatably coupled to the second end of the torsion spring; a valve handle graspable by a user; and A guide rod is fixed to the spring return cylinder, the guide rod includes an end and a guide rod interlocking portion, the end can be attached to the valve handle, and the guide rod interlocking portion is configured to interlock with the spring interlocking portion on the second end of the torsion spring.

51. The spring return handle device of claim 50, wherein the spring return cylinder comprises a spring return cylinder as claimed in any one of claims 1 to 13.

52. A spring return handle arrangement as claimed in any one of claims 50 and 51 wherein the guide rod interlock portion includes a shoulder surface and the spring interlock portion includes a countersunk surface of complementary shape for mating engagement with the shoulder surface.

53. The spring return handle assembly of claim 52, wherein said shoulder surface and said countersunk surface comprise interlocking ridged surfaces.

54. The spring return handle assembly of claim 52, wherein said shoulder surface and said countersunk surface comprise knurled surfaces.

55. The spring return handle device of any one of claims 52 to 54, further comprising a nut threadably connectable to the guide rod end and configured to be screwed onto the spring interlocking portion to maintain the interlocking engagement between the spring interlocking portion and the guide rod interlocking portion.

56. A spring return handle arrangement as claimed in any one of claims 50 to 55, wherein the guide rod comprises a guide rod extension having a lower aperture configured to receive a valve stem of the valve.

57. A spring return handle device as claimed in claim 50, wherein the spring return cylinder comprises a spring return cylinder as claimed in any one of claims 14 to 49.

58. A valve assembly comprising: a valve comprising a valve body and a rotatable valve stem extendable from the valve body; as well as A spring return handle device as claimed in any one of claims 50 to 57, wherein the first portion of the spring bracket is assembled with the valve body, and the second end of the torsion spring is assembled with the valve stem and rotationally fixed.

59. The valve assembly of claim 58, wherein the valve body includes a bonnet portion, wherein the first portion of the spring bracket is assembled with the bonnet portion.

60. The valve assembly of claim 59, wherein the first portion of the spring bracket is threadably assembled with the valve cover portion.

61. The valve assembly of any one of claims 58 to 60, further comprising a stem extension assembled with the valve stem.

62. The valve assembly of claim 61, wherein the guide stem extension includes a lower aperture for receiving the valve stem.

63. A method of assembling a preloaded spring return cylinder, the method comprising: The torsion spring is covered with a spring bracket; rotationally securing a first end of the torsion spring to a first portion of the spring bracket; rotating the second end of the torsion spring to a preloaded first rotational position; as well as The second end of the torsion spring is rotatably fixed to a second portion of the spring bracket in the preloaded first rotational position.

64. A method of installing a preloaded spring return cartridge and a valve handle on a valve having a valve body and a guide stem extending from the valve body, the method comprising: When the guide rod is in a desired spring return rotational position, inserting the guide rod through the center hole of the spring return cylinder; fixing the spring interlocking portion of the spring return cylinder and the guide rod interlocking portion of the guide rod into mating engagement; as well as Assemble the valve handle and the guide rod together.

65. A method of preloading a spring return cartridge for a rotary actuated valve, the spring return cartridge comprising: a torsion spring having an outer radial first end and an inner radial second end; a spring bracket surrounding the torsion spring and rotationally fixed to the outer radial first end; and a shaft surrounded by the torsion spring and rotationally fixed with the inner radial second end, the method comprising: rotating the shaft relative to the spring bracket to a first rotational limit position wherein the torsion spring is in a spring-loaded state; engaging an inner circumferential first interlocking portion on the spring bracket with an outer circumferential second interlocking portion on the shaft to fix the shaft in the first rotation limit position; The first interlock portion and the second interlock portion are configured to allow the shaft to rotate to a second rotational limit position defined by engagement of the first interlock portion and the second interlock portion, wherein the spring-loaded torsion spring is configured to bias the shaft toward the first rotational limit position.

66. A method as claimed in claim 65, wherein one of the first interlocking part and the second interlocking part includes at least one radially extending protrusion, and the other of the first interlocking part and the second interlocking part includes at least one arcuate recess for receiving at least one radially extending protrusion, and the shape of the arcuate recess is designed to define the first rotational limit position and the second rotational limit position.

67. The method of claim 66, wherein the at least one radially extending protrusion comprises a pin that is mounted through a hole in the spring bracket.

68. The method of claim 66, wherein the at least one radially extending protrusion is integrally formed with one of the spring bracket and the shaft.

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