Guide structure regulating valve with external valve core and internal valve seat

Abstract

The utility model provides a guide structure regulating valve with an external valve core and an internal valve seat, which relates to the technical field of valve structures, and comprises a valve body, the valve seat and the valve core, the valve body comprises a valve cavity, the valve seat comprises a valve seat body and a guide shell connected above the valve seat body, the valve seat body is connected to the inner wall of the valve cavity, and the valve core is arranged in the guide shell. A plurality of throttling hole sets are evenly formed in the guide shell in the radial direction of the guide shell, and each throttling hole set comprises two centrosymmetric throttling holes. The valve element is arranged on the periphery of the guide shell in a sleeving mode and moves up and down along the guide shell so as to adjust the opening degree of each throttling hole. The whole stroke of the valve element is guided through the guide shell, fluid can be decomposed into a series of jet flows through the multiple throttling hole sets in the guide shell, the jet flows collide with one another in the center area of the guide shell, and the mutual counter-acting force of the fluid is limited in the center area in the valve seat; and the situation that the valve element is unstable due to unbalanced impact force of a medium can be effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of valve structure technology, and in particular to a regulating valve with an external valve core and an internal guide structure. Background Technology

[0002] Traditional linear control valves are generally divided into single-seat control valves and sleeve control valves. The structure published in the *Practical Valve Design Handbook* (4th Edition) and other valve reference materials is consistent with the structure of linear control valves on the market. It mainly consists of a valve body, valve seat, valve core (valve plug), pressure cage (sleeve), valve stem, and valve cover. The valve stem drives the valve core to move away from or towards the valve seat, thereby opening and closing the control valve and regulating the flow rate. However, existing valve cores (valve plugs) are susceptible to uneven impact forces from the medium, causing them to rotate inside the valve body, leading to valve regulation failure or damage. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model adopts the following technical solution:

[0004] According to one aspect of the present invention, a regulating valve with an external valve core and an internal guide structure is provided, the regulating valve comprising:

[0005] Valve body, including valve cavity;

[0006] A valve seat includes a valve seat body and a guide housing connected above the valve seat body. The valve seat body is connected to the inner wall of the valve cavity. The guide housing is provided with a plurality of throttling orifice groups evenly distributed along its radial direction. Each throttling orifice group includes two centrally symmetrical throttling orifices.

[0007] The valve core is sleeved on the outer periphery of the guide housing and moves up and down along the guide housing to adjust the opening of each throttling orifice.

[0008] According to one embodiment of the present invention, the outer periphery of the valve seat body is provided with a valve seat sealing surface that cooperates with the valve core, and the inner periphery of the bottom of the valve core is provided with a valve core sealing surface corresponding to the valve seat sealing surface. The valve seat sealing surface is located below the throttling orifice, and the valve core sealing surface and the valve seat sealing surface cooperate to control the opening and closing of the valve body.

[0009] According to one embodiment of the present invention, the guide housing is provided with an annular groove on its outer periphery above the throttling orifice group, a sealing ring is installed in the annular groove, and the outer side of the sealing ring is connected to the valve core.

[0010] According to one embodiment of the present invention, the valve stem is further connected to the top of the valve core, and the top of the valve core is provided with a mounting hole for mounting the valve stem, and a positioning part for positioning the valve stem is provided between the mounting hole and the valve stem.

[0011] According to one embodiment of the present invention, the mounting hole includes a cylindrical hole segment and a conical hole segment located above the cylindrical hole. The inner wall of the conical hole segment forms the positioning part. The valve stem includes a first rod segment connected to the cylindrical hole segment and a second rod segment connected to the conical hole segment. The lower end of the second rod segment is inserted into the conical hole segment. The lower end of the second rod segment is provided with a positioning surface corresponding to the inner wall of the conical hole segment. The inner wall of the conical hole segment and the positioning surface together form the positioning part.

[0012] According to one embodiment of the present invention, the regulating valve with an external valve core and an internal guide structure further includes:

[0013] A sleeve is fitted around the outer periphery of the guide housing, with its bottom abutting against the top outer periphery of the valve seat body, and multiple through holes are provided thereon;

[0014] A valve cover is connected to the top of the valve body and the sleeve.

[0015] An actuator is connected to the side of the valve stem away from the valve core, and is used to drive the valve stem and the valve core to move up and down.

[0016] According to one embodiment of the present invention, the top of the valve core is provided with a plurality of evenly distributed balance holes, the balance holes connecting the inner cavity of the valve core and the valve cavity.

[0017] According to one embodiment of the present invention, the valve core and the valve seat are made of the same material and have equivalent mass.

[0018] According to one embodiment of the present invention, the throttling orifice includes:

[0019] The first orifice section has a V-shaped or trapezoidal projection on the axial direction of the guide housing, and the flow area of ​​the first orifice section gradually increases from bottom to top;

[0020] The second hole section is connected above the first hole section, and the projection of the second hole section on the axial direction of the guide housing is rectangular.

[0021] According to one embodiment of the present invention, the regulating valve with external valve core and internal guide structure further includes an inlet chamber and an outlet chamber that connect the valve cavity, wherein the centerline of the inlet end of the inlet chamber and the centerline of the outlet end of the outlet chamber are collinear.

[0022] This utility model has the following advantages or beneficial effects:

[0023] The guide housing of this invention guides the valve core throughout its entire stroke. Its large guiding area ensures the valve core is supported at any position during its stroke, preventing it from being affected by turbulence, standing waves, and pressure transients caused by throttling flow. This eliminates internal vibrations caused by lateral unstable impacts, resulting in a more stable valve regulation process. Furthermore, the multiple throttling orifices on the guide housing decompose the fluid into a series of jets. These jets collide with each other in the central region of the guide housing, consuming energy and generating back pressure. This reduces the pressure drop upstream and downstream of the throttling orifices, minimizing medium velocity, erosion, and noise, effectively preventing instability of the valve core due to uneven impact forces from the medium. Attached Figure Description

[0024] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0025] Figure 1 This is a cross-sectional view of a regulating valve with an external valve core and an internal guide structure, according to an exemplary embodiment.

[0026] Figure 2 This is a cross-sectional view of a valve seat according to an exemplary embodiment.

[0027] Figure 3 This is a cross-sectional view of a valve core shown according to an exemplary embodiment.

[0028] Figure 4 This is a partial structural schematic diagram of a valve stem according to an exemplary embodiment.

[0029] The reference numerals in the attached figures are explained as follows:

[0030] 1. Valve body; 11. Valve chamber; 12. Inlet chamber; 13. Outlet chamber;

[0031] 2. Valve seat; 21. Valve seat body; 211. Valve seat sealing surface; 22. Guide housing; 221. Throttling orifice assembly; 2211. Throttling orifice; 22111. First orifice section; 22112. Second orifice section; 222. Annular groove;

[0032] 3. Valve core; 31. Valve core sealing surface; 32. Mounting hole; 321. Cylindrical hole section; 322. Tapered hole section; 33. Balance hole;

[0033] 4. Sealing ring;

[0034] 5. Valve stem; 51. First stem segment; 52. Second stem segment; 521. Positioning surface;

[0035] 6. Sleeve; 61. Through hole;

[0036] 7. Valve cover;

[0037] 8. Implementing agency. Detailed Implementation

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0039] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0040] This utility model discloses a regulating valve with an external valve core and an internal guide structure. The regulating valve includes a valve body 1, a valve seat 2, and a valve core 3. The valve body 1 includes a valve cavity 11. The valve seat 2 includes a valve seat body 21 and a guide housing 22 connected above the valve seat body 21. The valve seat body 21 is connected to the inner wall of the valve cavity 11. The guide housing 22 has multiple throttling orifice groups 221 evenly distributed radially, each throttling orifice group 221 including two centrally symmetrical throttling orifices 2211. The valve core 3 is sleeved on the outer periphery of the guide housing 22 and moves up and down along the guide housing 22 to adjust the opening degree of each throttling orifice 2211. Figure 1 The valve seat body 21 shown is connected to the valve cavity 11. The valve seat body 21 and the guide housing 22 are integrally formed. The guide housing 22 is cylindrical. The valve core 3 has an inner cavity corresponding to the guide housing 22. The valve core 3 is sleeved on the outer periphery of the guide housing 22. The inner wall of the valve core 3 is in clearance fit with the outer wall of the guide housing 22. Within the range of motion of the valve core 3, the outer peripheral surface of the guide housing 22 is always in contact with and guides the inner peripheral surface of the valve core 3. That is, the guide housing 22 guides the valve core 3 throughout its entire stroke. The valve core 3 is supported at any position in its stroke. The valve core 3 is not affected by turbulence, standing waves and pressure transients generated by throttling flow, thereby eliminating internal vibration caused by lateral unstable impact. Compared with the prior art, which only relies on the contact surface between the valve stem 5 and the valve body 1 for guidance, this application has a larger guiding area, a more stable valve adjustment process, and a balanced structural design, which significantly reduces the force required by the actuator 8. In addition, as Figure 1-2The guide housing 22 shown has a circular radial cross-section. Multiple throttling orifice groups 221 are uniformly distributed along the outer periphery of the radial cross-section of the guide housing 22. The two throttling orifices 2211 in each throttling orifice group 221 are centrally symmetrical, that is, the two throttling orifices 2211 in each throttling orifice group 221 are arranged opposite each other along the diametrical direction of the radial cross-section of the guide housing 22. The central axes of the two throttling orifices 2211 are collinear and intersect with the central axis of the guide housing 22. The advantage of this design is that when fluid is input into the inlet chamber 12, as the fluid is injected into the interior of the guide housing 22 (also known as the valve seat 2) from each throttling orifice group 221, the mass flow of the fluid is effectively decomposed into a series of jets. Since the jet directions in the two oppositely arranged throttling orifices 2211 are completely opposite, these jets collide with each other in the central region of the guide housing 22, generating back pressure while consuming energy, thereby reducing the pressure drop upstream and downstream of the throttling orifice 2211, and thus minimizing the flow velocity, erosion and noise of the medium. Meanwhile, since the mutual reaction forces of the fluids are all confined to the central area inside the valve seat 2, the valve core 3 can be effectively prevented from becoming unstable due to the uneven impact force of the medium.

[0041] In a preferred embodiment of this utility model, such as Figure 1-2 The valve seat body 21 shown has a valve seat sealing surface 211 on its outer periphery that mates with the valve core 3. The valve core 3 has a valve core sealing surface 31 on its inner bottom periphery that corresponds to the valve seat sealing surface 211. The valve seat sealing surface 211 is located below the throttle orifice 2211. The valve core sealing surface 31 and the valve seat sealing surface 211 mate to control the opening and closing of the valve body 1. Figure 2 It is easy to see that the valve seat sealing surface 211 and the throttling orifice 2211 maintain a certain distance, allowing the medium to flow above the valve seat sealing surface 211. This prevents the valve seat sealing surface 211 from being eroded during small valve opening adjustments, thus avoiding valve adjustment failure or damage. Furthermore, the valve core sealing surface 31 and the valve seat sealing surface 211 are machined with the same diameter, improving the sealing effect between them. Simultaneously, the balance hole 33 on the valve core 3 ensures that the unbalanced area on the valve core 3 is only the area limited by the diameter of the valve stem 5, resulting in a very small unbalanced force.

[0042] In a preferred embodiment of this utility model, such as Figure 1-2 The guide housing 22 shown has an annular groove 222 on its outer periphery above the throttling orifice group 221. A sealing ring 4 is installed in the annular groove 222, and the outer side of the sealing ring 4 is connected to the valve core 3. The sealing ring 4 is used to seal the upper part of the valve seat 2 and the valve core 3, preventing fluid in the valve cavity 11 from entering the outlet cavity 13 through the balance hole 33 and the gap between the valve seat 2 and the valve core 3, thus ensuring the sealing performance of the valve.

[0043] In a preferred embodiment of this utility model, such as Figure 1 and 3The control valve with an external valve core and internal guide structure shown also includes a valve stem 5 connected to the top of the valve core 3. The top of the valve core 3 is also provided with a mounting hole 32 for mounting the valve stem 5. A positioning part for positioning the valve stem 5 is provided on the side of the mounting hole 32 near the valve stem 5. In the prior art, the valve core 3 and valve stem 5 are generally connected by threads and fixed with a transverse pin to prevent rotation. However, the coaxiality of the valve core 3 and valve stem 5 is low after connection, resulting in unstable sealing. This application, by providing a positioning part between the valve core 3 and valve stem 5, can effectively improve the coaxiality of the valve core 3 and valve stem 5, thereby improving the stability of the control valve operation.

[0044] In a preferred embodiment of this utility model, such as Figure 1 and 3 The mounting hole 32 shown includes a cylindrical hole section 321 and a tapered hole section 322 located above the cylindrical hole. The inner wall of the tapered hole section 322 forms a positioning part. The valve stem 5 includes a first rod section 51 connected to the cylindrical hole section 321 and a second rod section 52 connected to the tapered hole section 322. The lower end of the second rod section 52 is inserted into the tapered hole section 322. The lower end of the second rod section 52 is provided with a positioning surface 521 corresponding to the inner wall of the tapered hole section 322. The inner wall of the tapered hole section 322 and the positioning surface 521 together form the positioning part. Through the cooperation of the inner wall of the tapered hole section 322 and the positioning surface 521, the valve core 5 is threadedly connected to the valve stem 5, achieving tapered positioning and effectively controlling the coaxiality of the valve core 3 and the valve stem 5, thus improving the stability of valve operation.

[0045] In a preferred embodiment of this utility model, such as Figure 1 and 3 The illustrated regulating valve with an external valve core and internal guide structure also includes a sleeve 6, a valve cover 7, and an actuator 8. The sleeve 6 is fitted around the outer periphery of the guide housing 22, with its bottom abutting against the top outer periphery of the valve seat body 21, and has multiple through holes 61. The valve cover 7 is connected to the top of the valve body 1 and the sleeve 6. Figure 1 The valve seat 2 shown is axially fixed by the sleeve 6 and radially positioned by the valve body 1. The sleeve 6 is axially fixed by the valve cover 7 and radially positioned by the valve body 1. The valve cover 7 is radially positioned by the valve body 1. The valve sleeve 6 and valve seat 2 are detachable modules. When damaged, only the damaged part needs to be replaced, without disassembling the entire valve body 1, which facilitates later maintenance. At the same time, the cooperative structure of the valve body 1, valve seat 2, sleeve 6, and valve cover 7 makes the position of the valve seat 2 more stable, avoiding displacement caused by vibration or pressure changes, thereby preventing leakage. The valve sleeve 6 can also serve as an intermediate component, uniformly transmitting fluid pressure to the valve cover 7 and valve body 1 through multiple through holes 61, avoiding local stress concentration that could lead to deformation or cracking.

[0046] The actuator 8 is connected to the side of the valve stem 5 away from the valve core 3, and is used to drive the valve stem 5 and the valve core 3 to move up and down. The actuator 8 mainly uses compressed air as a power source. Its function is to receive control signals and drive the valve stem 5 and the valve core 3 to move up and down, so that the regulating valve can accurately and quickly adjust the valve opening and closing and the degree of opening.

[0047] In a preferred embodiment of this utility model, such as Figure 2 The valve core 3 shown has multiple evenly distributed balance holes 33 on its top, which connect the inner cavity of the valve core 3 and the valve cavity 11. In this application, the balance holes 33 on the valve core 3 can effectively reduce unbalanced forces. The unbalanced area on the valve core 3 is only the area defined by the diameter of the valve stem 5. Compared with the multiple balance holes 33, the unbalanced force of the valve stem 5 is very small, ensuring the smooth operation of the valve core 3.

[0048] In a preferred embodiment of this utility model, such as Figure 1-2 The valve core 3 and valve seat 2 shown are made of the same material and have similar mass. That is, the materials used for valve core 3 and valve seat 2 have approximately the same coefficient of thermal expansion, so changes in medium temperature have virtually no impact on the sealing effect, ensuring the sealing performance of the product.

[0049] In a preferred embodiment of this utility model, such as Figure 2 The throttling orifice 2211 shown includes a first orifice section 22111 and a second orifice section 22112. The projection of the first orifice section 22111 onto the axial direction of the guide housing 22 is V-shaped or trapezoidal, and the flow area of ​​the first orifice section 22111 gradually increases from bottom to top. The second orifice section 22112 is connected above the first orifice section 22111, and its projection onto the axial direction of the guide housing 22 is rectangular. The first orifice section 22111 corresponds to the situation when the valve is just started or the flow rate is small. The cross-sectional area of ​​the flow channel changes with the opening degree at a more gradual rate, resulting in less impact force of the fluid on the valve core 3. Furthermore, the V-shaped slope can guide the fluid to disperse and scour, reducing local wear and enabling high-precision fine-tuning. The second orifice section 22112 is suitable for valves with larger opening degrees. The cross-sectional area of ​​the flow channel increases linearly with the opening degree, allowing for rapid passage of large flow rates, reducing pressure loss. The rectangular symmetrical structure can reduce turbulence and vibration, avoiding cavitation damage caused by abrupt changes in the flow channel. In other words, the orifice 2211 of this application, through zoned optimization design, combines the large flow capacity of a rectangular structure with the fine control advantages of a V-shaped structure, while also taking into account the requirements of anti-cavitation, noise reduction, and extended lifespan. It is suitable for industrial scenarios with a wide operating range, high-precision adjustment, and high pressure differential. In addition, the orifice 2211 can be designed with linear characteristics, equal percentage characteristics, or other customized characteristics according to actual operating conditions. The shape and area of ​​the orifice 2211 can be designed according to actual operating conditions. Different flow characteristics can be achieved by changing the shape of the orifice 2211, and different flow capacities can be achieved by changing the area of ​​the orifice 2211.

[0050] In a preferred embodiment of this utility model, such as Figure 1 The illustrated regulating valve with an external valve core and internal guide structure also includes an inlet chamber 12 and an outlet chamber 13 connecting the valve chamber 11. The centerline of the inlet end of the inlet chamber 12 and the centerline of the outlet end of the outlet chamber 13 are collinear. Figure 1 As shown, the water flow direction in the inlet chamber 12 gradually rises from the outside to the inside. The inlet end of the outlet chamber 13 connects to the interior of the valve seat 2, and the water flow direction in the outlet chamber 13 gradually rises from the inside to the outside. The centerline of the inlet end of the inlet chamber 12 and the centerline of the outlet end of the outlet chamber 13 are collinear, and the inlet ends of the inlet chamber 12 and the outlet end of the outlet chamber 13 partially overlap. As the water flow direction changes, the inlet chamber 12 gradually rises above the outlet chamber 13. This design can solve the problem that existing single-seat regulating valves, due to their unbalanced structure (low inlet, high outlet), suffer from increased unbalanced force, resulting in a high thrust requirement for the actuator 8.

[0051] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly; for example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0052] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0053] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A regulating valve with an external valve core and an internal guide structure, characterized in that, include: Valve body (1), including valve cavity (11); The valve seat (2) includes a valve seat body (21) and a guide housing (22) connected above the valve seat body (21). The valve seat body (21) is connected to the inner wall of the valve cavity (11). The guide housing (22) has a plurality of throttling orifice groups (221) evenly opened along its radial direction. Each throttling orifice group (221) includes two centrally symmetrical throttling orifices (2211). The valve core (3) is sleeved on the outer periphery of the guide housing (22) and moves up and down along the guide housing (22) to adjust the opening of each of the throttling orifices (2211).

2. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, The outer periphery of the valve seat body (21) is provided with a valve seat sealing surface (211) that cooperates with the valve core (3). The inner periphery of the bottom of the valve core (3) is provided with a valve core sealing surface (31) that corresponds to the valve seat sealing surface (211). The valve seat sealing surface (211) is located below the throttle orifice (2211). The valve core sealing surface (31) and the valve seat sealing surface (211) cooperate to control the opening and closing of the valve body (1).

3. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, The guide housing (22) is provided with an annular groove (222) on the outer periphery above the throttling orifice group (221). A sealing ring (4) is installed in the annular groove (222), and the outer side of the sealing ring (4) is connected to the valve core (3).

4. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, It also includes a valve stem (5) connected to the top of the valve core (3), and the top of the valve core (3) is provided with a mounting hole (32) for mounting the valve stem (5), and a positioning part for positioning the valve stem (5) is provided between the mounting hole (32) and the valve stem (5).

5. The regulating valve with an external valve core and an internal guide structure according to claim 4, characterized in that, The mounting hole (32) includes a cylindrical hole section (321) and a tapered hole section (322) located above the cylindrical hole. The inner wall of the tapered hole section (322) forms the positioning part. The valve stem (5) includes a first rod section (51) connected to the cylindrical hole section (321) and a second rod section (52) connected to the tapered hole section (322). The lower end of the second rod section (52) is inserted into the tapered hole section (322). The lower end of the second rod section (52) is provided with a positioning surface (521) corresponding to the inner wall of the tapered hole section (322). The inner wall of the tapered hole section (322) and the positioning surface (521) together form the positioning part.

6. The regulating valve with an external valve core and an internal guide structure according to claim 4, characterized in that, Also includes: A sleeve (6) is fitted around the outer periphery of the guide housing (22), with its bottom abutting against the top outer periphery of the valve seat body (21), and multiple through holes (61) are provided thereon; A valve cover (7) is connected to the top of the valve body (1) and the sleeve (6); The actuator (8) is connected to the side of the valve stem (5) away from the valve core (3) and is used to drive the valve stem (5) and the valve core (3) to move up and down.

7. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, The valve core (3) has a plurality of evenly distributed balance holes (33) on its top, and the balance holes (33) connect the inner cavity of the valve core (3) and the valve cavity (11).

8. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, The valve core (3) and the valve seat (2) are made of the same material and have comparable mass.

9. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, The throttling orifice (2211) includes: The first hole section (22111) has a V-shaped or trapezoidal projection on the axial direction of the guide housing (22), and the flow area of ​​the first hole section (22111) gradually increases from bottom to top; The second hole segment (22112) is connected above the first hole segment (22111), and the projection of the second hole segment (22112) on the axial direction of the guide housing (22) is rectangular.

10. The regulating valve with an external valve core and an internal guide structure according to claim 1, characterized in that, It also includes an inlet chamber (12) and an outlet chamber (13) that connect the valve chamber (11), wherein the centerline of the inlet end of the inlet chamber (12) and the centerline of the outlet end of the outlet chamber (13) are collinear.

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