Axial flow cut-off valve

Abstract

The present invention relates to the technical field of pneumatic valves, and in particular to an axial flow cut-off valve, comprising: a valve body, a cut-off actuator, a valve core, and a balancing valve. The valve body is provided with an air inlet chamber, an inner chamber, and an air outlet chamber that are connected in sequence according to the direction of gas flow. The valve core is arranged between the inner chamber and the air outlet chamber. The cut-off actuator is partially arranged in the inner chamber. The output power of the cut-off actuator drives the valve core to move along its own axial direction, thereby realizing the connection and disconnection between the inner chamber and the air outlet chamber. The balancing valve is arranged on the valve body. The balancing valve is used to connect the air inlet chamber and the inner chamber when the valve core is closed. In the present invention, the valve core moves along its own axial direction under the drive of the cut-off actuator, thereby realizing the opening and closing of the valve. The valve core has the characteristics of large flow rate and low noise. The closing direction of the valve core is the same as the gas flow direction, thereby ensuring the sealing of the cut-off valve and having practicality.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic valves, and in particular to an axial flow cut-off valve. Background Art

[0002] Pneumatic shut-off valve is one of the automation components in the industrial production process. It is the actuator in the pneumatic unit combination instrument. It opens or cuts off the flow medium of the process pipeline according to the signal of the instrument to meet the system's requirements for industrial parameters such as pressure, temperature, and flow. It has the characteristics of simple structure, sensitive response, and reliable action. It can be widely used in industrial production departments such as petroleum, chemical industry, and metallurgy.

[0003] In the prior art, a general shut-off valve has a tortuous passage inside the circulation pipeline, which will produce a larger pressure loss compared with a shut-off valve that is similar to a straight pipe. When the gas flows inside the valve body, it will generate a large noise during use due to the impact on the pipeline wall. Moreover, when the valve core is closed, it is not tight enough and leakage is likely to occur, which has a great impact on the safety of the pipeline.

[0004] In view of the existence of the above problems, the designer, based on many years of rich practical experience and professional knowledge in the engineering application of such products, actively carried out research and innovation, in order to create an axial flow cut-off valve to make it more practical. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an axial flow cut-off valve, thereby solving the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An axial flow cut-off valve comprises: a valve body, a cut-off actuator, a valve core, and a balancing valve;

[0008] The valve body is provided with an air inlet cavity, an inner cavity and an air outlet cavity which are connected in sequence according to the gas flow direction, and the valve core is arranged between the inner cavity and the air outlet cavity;

[0009] The cut-off actuator is partially arranged in the inner cavity, and the output power of the cut-off actuator drives the valve core to move along its own axis direction, thereby realizing the connection and disconnection between the inner cavity and the air outlet cavity;

[0010] The balancing valve is arranged on the valve body, and the balancing valve is used to connect the air inlet cavity and the inner cavity when the valve core is closed.

[0011] Furthermore, the cut-off actuator at least includes a transmission rod, a valve stem, and a compression spring. The axis of the transmission rod is perpendicular to the axis of the valve stem. A limiting housing is arranged outside the transmission rod and the valve stem. The limiting housing is used to limit the movement direction of the transmission rod and the valve stem so that the transmission rod and the valve stem can only move along their own axis directions. One end of the transmission rod is connected to the valve core. The compression spring is arranged between the valve core and the limiting housing. A groove body is arranged on the side of the transmission rod close to the valve stem. The side of the groove body close to the valve core is a vertical surface structure, and the side of the groove body away from the valve core is Inclined surface structure, the end of the valve stem is an inclined surface structure, the end of the valve stem is inserted into the groove body and the end of the valve stem is fitted with the inclined surface of the groove body, pulling the valve stem away from the transmission rod to reduce the contact area between the groove body and the end of the valve stem, and the valve core moves close to the air outlet cavity driven by the elastic force of the compression spring until it contacts the air outlet cavity to close the axial flow cut-off valve, pushing the valve stem to move close to the transmission rod to increase the contact area between the groove body and the end of the valve stem, and the valve core moves away from the air outlet cavity driven by the transmission rod until it is out of contact with the air outlet cavity to open the axial flow cut-off valve.

[0012] Furthermore, a soft sealing structure is provided on the contact surface between the valve core and the air outlet cavity, and the soft sealing structure includes a trapezoidal groove opened on the valve core and a sealing ring inserted into the trapezoidal groove. A hard sealing surface is also provided on the contact surface between the valve core and the air outlet cavity, forming a double sealing structure with the soft sealing structure.

[0013] Furthermore, the limiting shell is provided with an air vent, and the air vent conducts gas inside and outside the limiting shell to prevent the pressure difference inside and outside the limiting shell from generating resistance to the axial movement of the transmission rod.

[0014] Furthermore, the interfaces at both ends of the valve body are butt-connected to the connecting pipeline via flanges.

[0015] Furthermore, the valve body is provided with a threaded sleeve at the air outlet cavity, the threaded sleeve is embedded in the air outlet cavity, and is fixedly connected to the air outlet cavity by threads.

[0016] Furthermore, the cut-off actuator also includes a pneumatic unit and a reset unit. The pneumatic unit includes a piston and a piston housing arranged outside the piston. The piston is dynamically sealed with the piston housing. The piston can move along its own axis. The piston is perpendicular to the valve stem. A limiting rod is provided on the end surface of the piston close to the valve stem. The diameter of the limiting rod is smaller than the diameter of the piston. Driven by the piston, the limiting rod can approach the side of the valve stem and axially limit the valve stem. An annular pressure chamber is formed between one end of the piston where the limiting rod is provided and the piston housing. A pressure interface is provided on the piston housing for connecting an external gas delivery pipeline with the pressure chamber. The external gas delivery enters the pressure chamber through the pressure interface to form a driving force on the piston, so that the piston moves away from the valve stem. A pressure regulating unit is connected to one end of the plug housing away from the valve stem, and the pressure regulating unit is used to adjust the reaction force preset in the axial movement of the piston. The reset unit includes a manual cut-off shaft and a rotating rod. The manual cut-off shaft includes a camshaft rotating along its own axis and an end head arranged at one end of the camshaft. The camshaft is installed inside the piston housing. A groove is provided on one side of the limit rod, and the end head enters the groove. The end head includes two relatively arranged circular arc surfaces and two planes. The circular arc surface or plane of the end head is changed to conflict with the inner wall of the groove by rotating the camshaft, so that the piston moves axially. The outside of the manual cut-off shaft is connected to the rotating rod, and the axis of the rotating rod is perpendicular to the axis of the camshaft. The circumferential rotation of the rotating rod drives the manual cut-off shaft to rotate along its own axis.

[0017] Furthermore, a steel ball is provided at the contact point between the limit rod and the side of the valve stem, an arc-shaped groove is provided on the limit rod, and an annular groove is provided on the valve stem, and the arc-shaped groove and the annular groove form a cavity for accommodating the steel ball.

[0018] Furthermore, the pressure regulating unit includes an adjusting shell, a spring, a connecting plate, and an adjusting screw. The adjusting shell is connected to the piston shell, and the inner cavity of the adjusting shell is communicated with the adjusting piston shell. The spring and the connecting plate are both located in the inner cavity of the adjusting shell, one end of the spring is connected to the piston, and the other end of the spring is connected to the connecting plate. The adjusting screw is screwed into the threaded hole on the adjusting shell and connected to the connecting plate.

[0019] The beneficial effects of the present invention are as follows: the valve core in the present invention moves along its own axial direction under the drive of the cut-off actuator, thereby realizing the opening and closing of the valve, and has the characteristics of large flow rate and low noise. The closing direction of the valve core is the same as the gas flow direction, thereby ensuring the sealing of the cut-off valve. Moreover, the present invention adopts a piston-type cut-off actuator, which has the advantages of high strength and good stability, and is particularly suitable for installation in high-pressure gas pipelines, and is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an axial flow cut-off valve in an embodiment of the present invention;

[0022] Figure 2 A cross-sectional view of an axial flow cut-off valve in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the valve stem and the transmission rod in the embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the valve core in an embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a cutting actuator in an embodiment of the present invention;

[0026] Figure 6 It is a cross-sectional view of a cutting-off actuator in an embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the manual cutting shaft in an embodiment of the present invention.

[0028] Figure numerals: valve body 1, cut-off actuator 2, valve core 3, balancing valve 4, compression spring 5, air vent 6, threaded sleeve 7, steel ball 8, air inlet chamber 11, inner chamber 12, air outlet chamber 13, transmission rod 21, valve stem 22, pneumatic unit 23, reset unit 24, trapezoidal groove 31, sealing ring 32, limit housing 121, groove body 211, piston 231, piston housing 232, pressure chamber 233, pressure interface 234, pressure regulating unit 235, regulating housing 236, spring 237, connecting plate 238, adjusting screw 239, manual cut-off shaft 241, rotating rod 242, camshaft 243, end 244, limit rod 2311, groove 2312. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] like Figure 1 and 2 An axial flow cut-off valve is shown, characterized in that it comprises: a valve body 1, a cut-off actuator 2, a valve core 3, and a balancing valve 4;

[0033] The valve body 1 is provided with an air inlet cavity 11, an inner cavity 12 and an air outlet cavity 13 which are connected in sequence according to the gas flow direction, and the valve core 3 is arranged between the inner cavity 12 and the air outlet cavity 13;

[0034] The cut-off actuator 2 is partially arranged in the inner cavity 12, and the output power of the cut-off actuator 2 drives the valve core 3 to move along its own axial direction, thereby realizing the connection and disconnection between the inner cavity 12 and the air outlet cavity 13;

[0035] The balancing valve 4 is disposed on the valve body 1 , and is used to connect the air inlet cavity 11 and the inner cavity 12 when the valve core 3 is closed.

[0036] As a preferred embodiment of the above, Figure 2 and 3As shown, the cut-off actuator 2 at least includes a transmission rod 21, a valve stem 22, and a compression spring 5. The axis of the transmission rod 21 is perpendicular to the axis of the valve stem 22. A limiting housing 121 is arranged outside the transmission rod 21 and the valve stem 22. The limiting housing 121 is used to limit the movement direction of the transmission rod 21 and the valve stem 22, so that the transmission rod 21 and the valve stem 22 can only move along their own axis directions. One end of the transmission rod 21 is connected to the valve core 3, and the compression spring 5 is arranged between the valve core 3 and the limiting housing 121. A groove body 211 is arranged on the side of the transmission rod 21 close to the valve stem 22. The side surface of the groove body 211 close to the valve core 3 is a vertical surface structure, and the side surface of the groove body 211 away from the valve core 3 is an inclined surface structure. The end of the valve stem 22 is an inclined surface structure, and the end of the valve stem 22 is inserted into the groove body 211. The end of the valve stem 22 fits with the inclined surface of the groove body 211, and the valve stem 22 is pulled away from the transmission rod 21 to move, so that the contact surface between the groove body 211 and the end of the valve stem 22 is reduced, and the valve core 3 moves close to the air outlet cavity 13 under the elastic force of the compression spring 5 until it contacts the air outlet cavity 13 to close the axial flow cut-off valve, and the valve stem 22 is pushed to move close to the transmission rod 22, so that the contact surface between the groove body 211 and the end of the valve stem 22 is increased, and the valve core 3 moves away from the air outlet cavity 13 under the drive of the transmission rod 22 until it does not contact the air outlet cavity 13 to open the axial flow cut-off valve. The closing direction of the valve core 3 in the present invention is the same as the gas flow direction. After the valve core 3 is closed, due to the pressure difference between the inner cavity 12 and the air outlet cavity 13, the valve core 3 is tightly fitted at the air outlet cavity 13, and the sealing is good. The gas enters the chambers in the cut-off valve without changing the flow direction, the gas is less obstructed during the flow, and the noise is low.

[0037] like Figure 4 As shown, in order to prevent gas leakage when the shut-off valve is closed, a soft sealing structure is provided on the contact surface between the valve core 3 and the air outlet cavity 13. The soft sealing structure includes a trapezoidal groove 31 opened on the valve core 3 and a sealing ring 32 inserted into the trapezoidal groove 31. In order to be suitable for high-pressure gas environments, a hard sealing surface is also provided on the contact surface between the valve core 3 and the air outlet cavity 13 to form a double sealing structure with the soft sealing structure.

[0038] As a preferred embodiment of the above, Figure 2 As shown, the limiting housing 121 is provided with a vent hole 6 , which conducts the gas inside and outside the limiting housing 121 to prevent the pressure difference inside and outside the limiting housing 121 from generating resistance to the axial movement of the transmission rod 21 .

[0039] like Figure 1 As shown, the interfaces at both ends of the valve body 1 are butt-connected to the connecting pipeline through flanges, which is convenient for installation.

[0040] like Figure 2As shown, in order to facilitate the installation of parts in the inner cavity 12, the valve body 1 is provided with a threaded sleeve 7 at the air outlet cavity 13. The threaded sleeve 7 is embedded in the air outlet cavity 13 and fixedly connected to the air outlet cavity 13 by threads. The valve core 3 and the transmission rod 21 to be installed in the inner cavity 12 are first placed through the air outlet cavity 13, and then the threaded sleeve 7 is installed, which greatly facilitates the installation of the cut-off valve.

[0041] As a preferred embodiment of the above, Figures 5 to 7 As shown, the cut-off actuator 2 also includes a pneumatic unit 23 and a reset unit 24. The pneumatic unit includes a piston 231 and a piston housing 232 arranged outside the piston 231. The piston 231 is dynamically sealed and connected to the piston housing 232. The piston 231 can move along its own axis. The piston 231 is perpendicular to the valve stem 22. A limiting rod 2311 is arranged on the end surface of the piston 231 close to the valve stem 22. The diameter of the limiting rod 2311 is smaller than the diameter of the piston 231. The limiting rod 2311 can approach the side of the valve stem 22 and axially limit the valve stem 22 under the drive of the piston 231. An annular pressure chamber 233 is formed between one end of the piston 231 provided with the limiting rod 2311 and the piston housing 232. A pressure interface 234 is arranged on the piston housing 232 for connecting the external gas delivery pipeline with the pressure chamber 233. The external delivery gas enters the pressure chamber 233 through the pressure interface 234 to form a driving force on the piston 231, so that the piston 231 moves away from the valve stem 22. The body 232 is connected to a pressure regulating unit 235 at one end away from the valve stem 22. The pressure regulating unit 235 is used to adjust the reaction force preset in the axial movement of the piston. The reset unit 24 includes a manual cut-off shaft 241 and a rotating rod 242. The manual cut-off shaft 241 includes a cam shaft 243 rotating along its own axis and an end head 244 arranged at one end of the cam shaft 243. The cam shaft 243 is installed inside the piston housing 232. A groove 2312 is provided on one side of the limit rod 2311. The end head 244 enters the groove 2312. The end head 244 includes two relatively arranged arc surfaces and two planes. The arc surface or the plane of the end head 244 is changed to conflict with the inner wall of the groove 2312 by rotating the cam shaft 243, so that the piston 231 moves axially. The manual cut-off shaft 241 is externally connected to the rotating rod 242. The axis of the rotating rod 242 is perpendicular to the axis of the cam shaft 243. The circumferential rotation of the rotating rod 242 drives the manual cut-off shaft 241 to rotate along its own axis.

[0042] like Figure 6 As shown, in order to facilitate the axial sliding of the valve stem 22, a steel ball 8 is provided at the contact point between the limiting rod 2311 and the side of the valve stem 22, an arc-shaped groove is provided on the limiting rod 2311, and an annular groove is provided on the valve stem 22. The arc-shaped groove and the annular groove form a cavity for accommodating the steel ball 8.

[0043] As a preferred embodiment of the above, Figure 5 and 6 As shown, the pressure regulating unit 235 includes an adjusting housing 236, a spring 237, a connecting plate 238, and an adjusting screw 239. The adjusting housing 236 is connected to the piston housing 232. The inner cavity of the adjusting housing 236 is communicated with the adjusting piston housing 232. The spring 237 and the connecting plate 238 are both located in the inner cavity of the adjusting housing 236. One end of the spring 237 is connected to the piston 231, and the other end of the spring 237 is connected to the connecting plate 238. The adjusting screw 239 is screwed into the threaded hole on the adjusting housing 236 and connected to the connecting plate 238. The length of the spring is changed by adjusting the length of the threaded hole in which the screw 239 is screwed. The elastic force of the spring changes, thereby changing the force on the axial movement of the piston 231, thereby changing the preset reaction force of the axial movement of the piston 231.

[0044] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An axial flow cut-off valve, characterized in that: include: Valve body (1), cut-off actuator (2), valve core (3), balancing valve (4); The valve body (1) is provided with an air inlet cavity (11), an inner cavity (12) and an air outlet cavity (13) which are connected in sequence according to the gas flow direction, and the valve core (3) is arranged between the inner cavity (12) and the air outlet cavity (13); The cut-off actuator (2) is partially disposed in the inner cavity (12), and the cut-off actuator (2) outputs power to drive the valve core (3) to move along its own axial direction, thereby realizing the connection and disconnection between the inner cavity (12) and the air outlet cavity (13); The balancing valve (4) is arranged on the valve body (1), and the balancing valve (4) is used to connect the air inlet cavity (11) and the inner cavity (12) when the valve needs to be opened, so as to reduce the opening resistance; The cut-off actuator (2) comprises at least a transmission rod (21), a valve stem (22), and a compression spring (5); the axis of the transmission rod (21) is perpendicular to the axis of the valve stem (22); a limiting housing (121) is provided outside the transmission rod (21) and the valve stem (22); the limiting housing (121) is used to limit the movement direction of the transmission rod (21) and the valve stem (22), so that the transmission rod (21) and the valve stem (22) only move along their own axis directions; one end of the transmission rod (21) is connected to the valve core (3); the compression spring (5) is provided between the valve core (3) and the limiting housing (121); a groove body (211) is provided on a side of the transmission rod (21) close to the valve stem (22); a side surface of the groove body (211) close to the valve core (3) is a vertical surface structure; the groove body (211) is away from the valve core (3) ) has an inclined surface structure, the end of the valve stem (22) has an inclined surface structure, the end of the valve stem (22) is inserted into the groove body (211) and the end of the valve stem (22) fits the inclined surface of the groove body (211), pulling the valve stem (22) away from the transmission rod (21), so that the contact surface between the groove body (211) and the end of the valve stem (22) is reduced, and the valve core (3) is elastically moved when the compression spring (5) is pressed against the valve core (3). The valve core (3) is driven by the transmission rod (22) to move closer to the air outlet cavity (13) until it contacts the air outlet cavity (13), thereby closing the axial flow cut-off valve; the valve stem (22) is pushed closer to the transmission rod (22), thereby increasing the contact surface between the groove body (211) and the end of the valve stem (22); the valve core (3) is driven by the transmission rod (22) to move away from the air outlet cavity (13), until it is no longer in contact with the air outlet cavity (13), thereby opening the axial flow cut-off valve; The limiting housing (121) is provided with an air vent (6), and the air vent (6) conducts gas inside and outside the limiting housing (121) to prevent the pressure difference inside and outside the limiting housing (121) from generating resistance to the axial movement of the transmission rod (21); The cut-off actuator (2) further comprises a pneumatic unit (23) and a reset unit (24); the pneumatic unit comprises a piston (231) and a piston housing (232) arranged outside the piston (231); the piston (231) and the piston housing (232) are connected in a dynamic sealing manner; the piston (231) can move along its own axis; the piston (231) is perpendicular to the valve stem (22); a limit rod (2311) is arranged on an end surface of the piston (231) close to the valve stem (22); the diameter of the limit rod (2311) is smaller than the diameter of the piston (231); the limit rod (2311) ) can approach the side of the valve stem (22) and axially limit the valve stem (22) under the drive of the piston (231); an annular pressure chamber (233) is formed between one end of the limiting rod (2311) provided on the piston (231) and the piston housing (232); a pressure interface (234) is provided on the piston housing (232) for connecting an external gas delivery pipeline with the pressure chamber (233); the external gas delivery enters the pressure chamber (233) through the pressure interface (234) to form a driving force on the piston (231), so that the piston (231) moves away from the valve stem (22). The piston housing (232) is connected to a pressure regulating unit (235) at one end away from the valve stem (22). The pressure regulating unit (235) is used to adjust a reaction force preset in the axial movement of the piston. The reset unit (24) comprises a manual cut-off shaft (241) and a rotating rod (242). The manual cut-off shaft (241) comprises a cam shaft (243) rotating along its own axis and an end (244) arranged at one end of the cam shaft (243). The cam shaft (243) is installed inside the piston housing (232). A groove (2312) is provided on one side of the limit rod (2311). The end head (244) enters the groove (2312), and the end head (244) comprises two arc surfaces and two planes arranged opposite to each other. The arc surface or the plane of the end head (244) is changed to contact the inner wall of the groove (2312) by rotating the camshaft (243), so that the piston (231) moves axially. The manual cutting shaft (241) is externally connected to the rotating rod (242), and the axis of the rotating rod (242) is perpendicular to the axis of the camshaft (243). The rotating rod (242) is rotated in a circle to drive the manual cutting shaft (241) to rotate along its own axis.

2. The axial flow cut-off valve according to claim 1, characterized in that: A soft sealing structure is provided on the contact surface between the valve core (3) and the air outlet cavity (13), the soft sealing structure comprising a trapezoidal groove (31) provided on the valve core (3) and a sealing ring (32) inserted into the trapezoidal groove (31).

3. The axial flow cut-off valve according to claim 1, characterized in that: The interfaces at both ends of the valve body (1) are butt-connected to the connecting pipeline through flanges.

4. The axial flow cut-off valve according to claim 1, characterized in that: The valve body (1) is provided with a threaded sleeve (7) at the air outlet cavity (13); the threaded sleeve (7) is embedded in the air outlet cavity (13) and is fixedly connected to the air outlet cavity (13) by means of threads.

5. The axial flow cut-off valve according to claim 1, characterized in that: A steel ball (8) is provided at the contact point between the limiting rod (2311) and the side of the valve stem (22); an arc-shaped groove is provided on the limiting rod (2311); an annular groove is provided on the valve stem (22); the arc-shaped groove and the annular groove form a cavity for accommodating the steel ball (8).

6. The axial flow cut-off valve according to claim 5, characterized in that: The pressure regulating unit (235) comprises a regulating housing (236), a spring (237), a connecting plate (238), and an adjusting screw (239); the regulating housing (236) is connected to the piston housing (232); the inner cavity of the regulating housing (236) is communicated with the regulating piston housing (232); the spring (237) and the connecting plate (238) are both located in the inner cavity of the regulating housing (236); one end of the spring (237) is connected to the piston (231); the other end of the spring (237) is connected to the connecting plate (238); the regulating screw (239) is screwed into a threaded hole on the regulating housing (236) and connected to the connecting plate (238).

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