Housing structure of valve device, actuator for valve, and manufacturing method of valve device

Abstract

To provide a housing structure of a valve device which can evenly apply a paint to a gap between a flange part provided at a housing as a pedestal and a surface of the housing, and to provide an air actuator for a valve and a manufacturing method of the valve device.SOLUTION: In a housing structure 1 of a valve device, a flange part 33 is provided at a housing 10 as a pedestal around a valve stem or a drive shaft 51. The flange part 33 protrudes into an area facing a surface 20a of the housing 10. The flange part 33 has, a surface at the side facing the surface 20a of the housing 10, a thickness adjustment surface part 33b having an inclined surface shape or a curved surface shape which gradually expands from the back side to the inlet G1 side in a gap G between the flange part 33 and the surface 20a of the housing 10.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a housing structure of a valve device, an air actuator for a valve, and a method for manufacturing the valve device, and in particular to a housing structure of a valve device having a flange portion on the housing, an air actuator for a valve, and a method for manufacturing the valve device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, valves or valve devices such as air actuators for valves that actuate the valves often have their housings molded in separate parts by casting. For this reason, such a valve device is assembled by connecting together a plurality of divided housings that constitute a housing. If housings with such a connected structure are painted separately, it is easy to paint the areas that will become gaps after connection; however, this increases the number of painting steps and causes paint to adhere to areas that do not actually need to be painted, so a painting method in which spray painting is applied to the entire structure using a spray gun or the like after connection is often chosen.

[0003] For example, Patent Document 1 describes a method for painting a valve after assembly, an apparatus for painting the valve, and the valve. The valve coating method, apparatus, and valves described in Patent Document 1 are not only suitable for high-mix, low-volume production in automated valve coating, but also enable automated coating of valves without paint blemishes by performing the coating automatically within the minimum necessary space, thereby making a significant contribution to labor savings. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-34114 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the housing of the valve device is formed with a through hole in the axial direction of the valve shaft, and the valve shaft or a drive shaft connected to one end of the valve shaft passes through this through hole, a protruding flange portion is provided to add a function as a base for mounting an external attachment related to the rotational movement of the valve shaft or drive shaft, such as a valve open / close display plate or a limit switch, and this flange portion has come to affect both the painting and the cost of the valve device. That is, when it comes to painting valve equipment, due to recent demands for compact valves or air actuators for valves, as well as dimensional restrictions imposed by standards such as the Namur standard, it is only possible to provide a small gap between the flange of the housing that functions as a base and the surface of the housing that faces this flange, making it difficult to insert a nozzle into that narrow gap when painting with a paint spray. For this reason, painting must be applied to the valve equipment from a distance, but simply changing the application angle of the paint spray to paint in narrow gaps makes it difficult to paint evenly inside the gap.

[0006] The present invention was developed to solve the problems of the related art, and its object is to provide a housing structure for a valve device, an air actuator for a valve, and a method for manufacturing a valve device, which make it possible to apply paint evenly into the gap between a flange portion provided as a base on the housing and the surface of the housing. [Means for solving the problem]

[0007] In order to achieve the above object, the invention of claim 1 is a housing structure for a valve device in which a flange portion is provided on a housing as a base around a valve shaft or a drive shaft, this flange portion protrudes into an area facing the surface of the housing, and the flange portion has a thickness adjustment surface portion on the side facing the surface of the housing, the thickness adjustment surface portion having an inclined or curved shape that gradually widens the gap with the surface of the housing from the back side toward the inlet side.

[0008] The invention of claim 2 is a housing structure for a valve device in which a housing is assembled by connecting a plurality of split housings, a flange portion is provided on one of the plurality of split housings so as to protrude toward the connected split housing, and a thickness adjustment surface portion is provided on the surface facing the connected split housing.

[0009] In order to achieve the above object, the invention of claim 3 is an air actuator for a valve, which is provided with a flange portion that protrudes into an area facing the surface of the housing as a base around the drive shaft, and an external attachment mounting surface portion for mounting an external attachment to the upper surface of the housing including the flange portion, and the flange portion has a thickness adjustment surface portion on the side facing the surface of the housing that has an inclined or curved shape that gradually widens the gap with the surface of the housing from the back side toward the inlet side.

[0010] The invention of claim 4 is an air actuator for a valve, in which a housing is assembled by connecting a number of split housings, a flange portion is provided on one of the multiple split housings so as to protrude toward the connected split housing, and a thickness adjustment surface portion is provided on the surface facing the connected split housing.

[0011] The invention of claim 5 is an air actuator for a valve, in which a split housing having a flange portion is a housing that accommodates a drive shaft, and the connected split housing is a cylinder that accommodates an air-driven piston and is connected to the housing so as to extend in the direction of movement of the piston, and the flange portion has a thickness adjustment surface portion in at least one direction, with an end portion that protrudes in the extension direction of the cylinder to the upper region of the cylinder as the entrance of a gap.

[0012] The invention according to claim 6 is an air actuator for a valve, in which the flange portion has thickness adjustment surface portions in a plurality of directions formed from the back side of the gap toward the inlet side in a plurality of different directions.

[0013] The invention according to claim 7 is an air actuator for a valve, in which the split housing is a casting.

[0014] The invention of claim 8 is a method for manufacturing a valve device, which includes a thickness adjustment surface forming step of providing a flange portion on a housing as a base around a valve shaft or a drive shaft, painting the housing of a valve device in which the flange portion protrudes into an area facing the surface of the housing, and forming a thickness adjustment surface portion having an inclined or curved shape on the surface of the flange portion facing the surface of the housing so that the gap between the surface of the housing and the flange portion gradually expands from the back side toward the inlet side, and an oblique painting step of spraying paint from diagonally above the surface of the housing facing the thickness adjustment surface portion with a paint nozzle directed toward the surface of the housing when painting the gap between the surface of the flange portion on which the thickness adjustment surface portion is formed and the surface of the housing. Effect of the Invention

[0015] According to the invention of claim 1, a flange portion is provided on the housing as a base around the valve shaft or drive shaft, the flange portion protrudes into an area facing the surface of the housing, and the flange portion has a thickness adjustment surface portion on the side facing the surface of the housing, the thickness adjustment surface portion having an inclined or curved shape that gradually widens the gap with the surface of the housing from the rear side toward the inlet side. As a result, in the region where the thickness adjusting surface portion is provided, the thickness of the flange portion is formed to be thicker on the base end side, which is the inner side of the gap, and is formed to be gradually thinner from the base end toward the protruding tip end. In the area where the thickness adjustment surface portion is provided, the gap between the flange portion and the surface of the housing gradually expands from the back side toward the entrance side, and is largest at the entrance, and the thickness adjustment surface portion, which becomes the painted surface, is positioned with its inclined surface facing the entrance side. Therefore, the base end of the flange portion ensures sufficient strength as a seat, while the thickness of the portion that is less likely to affect the strength is reduced to enlarge the opening on the inlet side. When spray painting is applied to the gap between the flange portion of the housing and the surface of the housing using a spray gun or the like, paint is sprayed from the large opening inlet toward the area of ​​the surface facing the thickness adjustment surface portion with the paint nozzle directed diagonally from above, thereby effectively painting that surface, while in the area of ​​the surface where the thickness adjustment surface portion is provided, the thickness adjustment surface portion facing the inlet is effectively painted, and moreover, the paint penetrates into the interior through the gap space that expands from the back toward the inlet, thereby effectively painting the back side of the gap and even the surrounding area of ​​the thickness adjustment surface portion. Therefore, it is possible to paint evenly in the gap between the housing and the flange portion provided as a base on the housing.

[0016] Furthermore, according to the invention of claim 1, by providing a thickness adjustment surface portion on the flange portion, the flange portion is formed gradually thinner in the area where the thickness adjustment surface portion is provided from the base end portion which is the back side of the gap toward the protruding tip end, thereby reducing the amount of material used in the flange portion and enabling material costs to be reduced.

[0017] According to the invention of claim 2, the housing is assembled by connecting a plurality of split housings, a flange portion is provided on one of the plurality of split housings so as to protrude toward the connected split housing, and a thickness adjustment surface portion is provided on the surface facing the connected split housing. If a housing with such a connected structure is painted separately, it is easy to paint the areas that will become gaps after connection; however, this increases the amount of painting work and causes paint to adhere to areas that do not actually need to be painted, which is inconvenient. Therefore, if spray painting is applied to the entire housing after connection using a spray gun or the like, it becomes difficult to paint the gaps that form after connection. However, according to the invention of claim 2, it is possible to evenly paint the gaps between the flange portion of a housing assembled by connecting multiple split housings and the split housing that is to be connected.

[0018] According to the invention of claim 3, the housing is provided with a flange portion protruding into an area facing the surface of the housing, and an external attachment mounting surface portion for mounting an external attachment to the upper surface of the housing including the flange portion, and the flange portion has a thickness adjustment surface portion on the side facing the surface of the housing, the thickness adjustment surface portion having an inclined or curved shape that gradually widens the gap with the surface of the housing from the rear side toward the entrance side. As a result, in the region where the thickness adjusting surface portion is provided, the thickness of the flange portion is formed to be thicker on the base end side, which is the inner side of the gap, and is formed to be gradually thinner from the base end toward the protruding tip end. In the area where the thickness adjustment surface portion is provided, the gap between the flange portion and the surface of the housing gradually expands from the back side toward the entrance side, and is largest at the entrance, and the thickness adjustment surface portion, which becomes the painted surface, is positioned with its inclined surface facing the entrance side. Therefore, the base end of the flange portion ensures sufficient strength to withstand the load of external attachments, while the thickness of the portion that is less likely to affect the strength is reduced to enlarge the opening on the inlet side. When spray painting is applied to the gap between the flange portion of the housing and the surface of the housing using a spray gun or the like, paint is sprayed from diagonally above through the large opening at the surface area facing the thickness adjustment surface portion, thereby effectively painting that surface, while in the surface area where the thickness adjustment surface portion is provided, the thickness adjustment surface portion facing the entrance is effectively painted, and moreover, the paint penetrates into the interior through the gap space that expands from the back towards the entrance, thereby effectively painting the back side of the gap and even the surrounding area of ​​the thickness adjustment surface portion. Therefore, it is possible to paint evenly in the gap between the housing and the flange portion provided as a base on the housing.

[0019] According to the invention of claim 4, the housing is assembled by connecting a plurality of split housings, a flange portion is provided on one of the plurality of split housings so as to protrude toward the connected split housing, and a thickness adjustment surface portion is provided on the surface facing the connected split housing. This allows the paint to be applied evenly to the gap between the flange portion provided on the upper surface thereof as a base for mounting an external attachment and the other divided housing with which it is connected.

[0020] According to the invention of claim 5, the split housing having a flange portion is a housing that accommodates a drive shaft, and the connected split housing is a cylinder that accommodates an air-driven piston and is connected to the housing so as to extend in the direction of movement of the piston, and the flange portion has a thickness adjustment surface portion in at least one direction, with an end portion that protrudes in the extension direction of the cylinder up to the upper region of the cylinder as the entrance of a gap. This effectively utilizes the upper region of the cylinder where the flange portion extends in the direction of piston movement to enlarge its upper surface, which serves as the mounting surface for external attachments, and the thickness adjustment surface portion provided in the direction extending to the upper region of the cylinder ensures that the opening of the gap is largest at the entrance in the upper region of the cylinder. As a result, the upper surface of the flange portion, which is expanded greatly to the upper region of the cylinder, is widely secured as a mounting surface for external attachments, while paint can be applied evenly to the entire gap between the expanded flange portion and the other divided housing with which it is connected.

[0021] According to the invention of claim 6, the flange portion has thickness adjustment surface portions in multiple directions formed from the back side of the gap toward the entrance sides in multiple different directions, so that the base end of the flange portion is thick enough to provide strength, while thin portions are formed in multiple locations that are unlikely to affect the strength of the flange portion, and multiple entrances in different directions of the gap are opened wide. Therefore, when spray painting is performed using a spray gun or the like into the gap between the flange portion and the surface of the housing, the spray painting can be performed from multiple inlets that are opened widely in multiple directions.

[0022] According to the invention of claim 7, since the split casing is a cast product, when the casing is formed by casting, each of the split casings can be divided into several parts and each split casing can be molded separately. By connecting a split casing having a flange portion to a corresponding split casing, a small gap can be provided between the flange portion of the assembled casing and the corresponding split casing. The thickness adjustment surface portion provided on the underside of the flange portion, which is inside the gap, makes it possible to apply paint evenly within the gap.

[0023] According to the invention of claim 8, the method includes a thickness adjustment surface forming step of forming a thickness adjustment surface portion having an inclined or curved shape on the surface of the flange portion facing the surface of the housing so that the gap between the surface of the housing and the thickness adjustment surface portion gradually widens from the rear side toward the entrance side, and an oblique painting step of spraying paint from diagonally above the surface of the housing facing the thickness adjustment surface portion with a paint nozzle directed toward the surface of the housing when painting the gap between the surface of the flange portion on which the thickness adjustment surface portion is formed and the surface of the housing. As a result, in the region where the thickness adjusting surface portion is provided, the thickness of the flange portion is formed to be thicker on the base end side, which is the inner side of the gap, and is formed to be gradually thinner from the base end toward the protruding tip end. In the area where the thickness adjustment surface portion is provided, the gap between the flange portion and the surface of the housing gradually expands from the back side toward the entrance side, and is largest at the entrance, and the thickness adjustment surface portion, which becomes the painted surface, is positioned with its inclined surface facing the entrance side. Therefore, the base end of the flange portion ensures sufficient strength as a seat, while the thickness of the portion that is less likely to affect the strength is reduced to enlarge the opening on the inlet side. When spray painting is applied to the gap between the flange portion of the housing and the surface of the housing using a spray gun or the like, paint is sprayed from the large opening inlet toward the area of ​​the surface facing the thickness adjustment surface portion with the paint nozzle directed diagonally from above, thereby effectively painting that surface, while in the area of ​​the surface where the thickness adjustment surface portion is provided, the thickness adjustment surface portion facing the inlet is effectively painted, and moreover, the paint penetrates into the interior through the gap space that expands from the back toward the inlet, thereby effectively painting the back side of the gap and even the surrounding area of ​​the thickness adjustment surface portion. Therefore, it is possible to paint evenly in the gap between the housing and the flange portion provided as a base on the housing. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view of an air actuator for a valve having a housing structure for a valve device according to a first embodiment. [Diagram 2] FIG. 2 is a partial cross-sectional view of the air actuator for a valve shown in FIG. [Diagram 3] 2 is a perspective view of a top cover having a flange portion shown in FIG. 1. [Figure 4] 13 is a diagram for explaining the effect of providing a thickness adjusting surface portion on the flange portion in painting an air actuator for a valve. FIG. [Diagram 5] 13 is a diagram for explaining the effect of providing a thickness adjusting surface portion on the flange portion in painting an air actuator for a valve. FIG. [Figure 6] FIG. 13 is a diagram showing a first modified example of the thickness adjusting surface portion. [Figure 7] FIG. 13 is a diagram showing a second modified example of the thickness adjusting surface portion. [Figure 8] FIG. 11 is a cross-sectional view of a valve having a housing structure of a valve device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a housing structure for a valve device, an air actuator for a valve, and a method for manufacturing a valve device according to the present invention will be described in detail with reference to FIGS. The present disclosure is not limited to the embodiments shown below. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each element may differ from the reality. Furthermore, the drawings may include parts with different dimensional relationships and ratios.

[0026] (Embodiment 1) Fig. 1 is a perspective view of an air actuator for a valve 100 having a housing structure 1 for a valve device according to embodiment 1. Fig. 2 is a partial cross-sectional view of the air actuator for a valve 100 shown in Fig. 1. Fig. 3 is a perspective view of an upper cover 32 having a flange portion 33 shown in Fig. 1.

[0027] The air actuator 100 for a valve is an air-driven actuator and includes a housing 10, a piston 40 assembled to the housing 10, and a rotation conversion mechanism 50 assembled to the housing 10 so as to convert the reciprocating motion of the piston 40 into rotational motion and transmit it to a drive shaft 51. This air actuator 100 for a valve has a housing structure 1 for a valve device, and a housing 10 forming the outer shell thereof is assembled by connecting a plurality of divided housings 20, 30, 31, and 32. In the valve device housing structure 1 of embodiment 1, the top cover 32 of the housing 30, which is one of the multiple divided housings 20, 30, 31, 32, has a through hole 34 in the axial direction of a valve shaft (not shown), and a drive shaft 51 connected coaxially to the valve shaft passes through this through hole 34. The top cover 32 is provided with a flange portion 33 which serves as a seat around the drive shaft 51 and protrudes towards the cylinder 20 which is the divided housing to be connected. The flange portion 33 has, on a surface 33a facing the cylinder 20, a thickness adjusting surface portion 33b in the form of an inclined surface such that the gap G between the flange portion 33 and the cylinder 20 gradually increases from the rear side toward the inlet G1 side. In the first embodiment, the "entrance G1 of the gap G" refers to the entrance on the front side of the gap G when the protruding tip surface of the flange portion 33 is taken as the front.

[0028] <Regarding the Housing 10 of the Air Actuator 100 for Valve> The casing 10 has a housing 30 which accommodates a drive shaft 51, and a cylinder 20 which accommodates an air-driven piston 40 and is connected so as to extend the casing 10 in a direction approximately perpendicular to the drive shaft 51, which is the direction of movement of the piston 40 relative to the housing 30. In the first embodiment, the cylinder 20 and the housing 30, which are the multiple divided housings that make up the housing 10, are manufactured by casting. The split housing may be manufactured by a manufacturing method other than casting. For example, the split housing may be manufactured by cutting, or various manufacturing methods may be combined.

[0029] <About Housing 30> The housing 30 is a divided housing that is connected to the cylinder 20 to form part of the housing 10 of the air actuator for a valve 100, and has a housing main body 31 and a top cover 32 that closes the top opening of the housing main body 31. That is, the housing 30 is also configured by connecting two separate housings, the housing main body 31 and the top cover 32, so that each member can be easily cast. In particular, since the housing 30 is divided into the housing body 31 and the top cover 32 and provided as separate divided housings, the flange portion 33 can be easily molded even if the gap G formed between the lower surface of the flange portion 33 and the upper surface of the cylinder 20 is set small when they are connected to each other.

[0030] A rotation conversion mechanism 50 is provided inside the housing body 31. In this embodiment 1, a so-called Scotch yoke mechanism is adopted as the rotation conversion mechanism 50. This rotation conversion mechanism 50 has a Scotch yoke 52 that engages with a pin (not shown) that protrudes radially outward from the piston rod 41, and a drive shaft 51 that is connected to this Scotch yoke 52 and is driven to rotate as an output shaft. In other words, the rotation conversion mechanism 50 converts the reciprocating motion of the piston 40 into the rotational motion of the drive shaft 51 via the Scotch yoke 52 . The drive shaft 51 has one lower end connected to a valve shaft of a valve not shown, and the upper end of the other end protrudes from the inside to the outside of the housing 30 through a through hole 34 formed in the upper surface 32a of the top cover 32, which is the upper surface of the housing 30.

[0031] The top cover 32 is provided with a flange portion 33 that enlarges the top surface that serves as the mounting surface for the external attachment M. The top surface 30a of the top cover 32 serves as an external attachment mounting surface portion 30b to which an external attachment M such as a limit switch or a positioner can be freely attached.

[0032] The flange portion 33 is provided so as to protrude in a direction in which the housing 30 is connected to the cylinder 20 and in the opposite direction. In the first embodiment, the flange portion 33 protrudes to an upper region of the cylinder 20 in the extension direction of the cylinder 20. Here, in the air actuator 100 for a valve of this embodiment 1, the distance between the underside 33a of the flange portion 33 and the top surface of the cylinder 20 is kept small in order to make the device compact. However, since the top cover 32, the housing main body 31, and the cylinder 20 are each provided separately, even if the gap G is small, it is easy to form by casting. In particular, even in the case of the air actuator 100 for a valve of this embodiment 1, a configuration in which a thickness adjustment surface portion 33b is provided on the lower surface 33a side of the flange portion 33, i.e., on the inside of the above-mentioned gap G, is made easy to cast. The housing 30 may be divided in any manner as long as the thickness adjusting surface 33b can be provided on the lower surface 33a of the flange 33. For example, the housing 30 may be formed by integrally providing the housing body 31 and the upper cover 32, or may be divided into a cylinder cap on the side opposite to the side connected to the cylinder 20 in the direction perpendicular to the drive shaft 51.

[0033] In addition, the flange portion 33 has a thickness adjustment surface portion 33b formed in an inclined surface shape on the surface of the flange portion 33 facing the cylinder 20, which is the divided housing to which it is connected, i.e., on the underside 33a of the flange portion 33, so that the gap G with the cylinder 20 gradually widens from the back side toward the inlet G1 side. The mold for casting is provided with an inclined surface portion corresponding to the thickness adjusting surface portion 33b, and the thickness adjusting surface portion 33b has an inclined surface formed by casting. In this embodiment 1, the flange portion 33 has a thickness adjustment surface portion 33b in one direction (hereinafter referred to as the ``cylinder side thickness adjustment surface portion'' when distinguishing it from other thickness adjustment surface portions) whose end portion protrudes in the extension direction of the cylinder to the upper region of the cylinder 20 and serves as the entrance G1 of the gap G, and a thickness adjustment surface portion 33bb in another direction whose end portion protrudes in the opposite direction to the thickness adjustment surface portion 33b in one direction, i.e., the side opposite to the side connected to the cylinder 20, and serves as the entrance G1 of the gap G.

[0034] Each of the thickness adjusting surfaces 33b, 33bb is formed in a substantially central region in the width direction of the flange portion 33 when the protruding tip surface of the flange portion 33 is viewed as a front surface. Therefore, at both ends of the top cover 32 when viewed from the protruding tip surface of the flange portion 33, the thickness of the base end portion 33c of the flange portion 33 is ensured from the back side of the gap G to the entrance G1 side. Both ends of this flange portion 33 are provided with screw holes 33e for fixing external attachments.

[0035] <About Cylinder 20> The cylinder 20 is a separate housing that is connected to the housing 30 to form a part of the housing of the air actuator 100 for a valve. This cylinder 20 has a space formed inside in which air is drawn in and exhausted through two air ports 21, and a piston rod 41 having the piston 40 attached to one end thereof is supported so as to be freely movable along the movement direction of the piston 40 from the cylinder 20 through the housing 30. The piston 40 is reciprocated inside the cylinder 20 by the intake and exhaust of air through two air ports 21. The reciprocating motion of the piston rod 41, which is linked to the piston 40, is converted into rotational motion of the drive shaft 51 by the rotation conversion mechanism 50, so that the valve shaft connected to the drive shaft 51 is rotated in the direction of opening and closing the valve.

[0036] The cylinder 20 is connected to the housing 30 with its longitudinal direction aligned in the reciprocating direction of the piston 40 and oriented in a direction substantially perpendicular to the drive shaft 51 . For this reason, the longitudinal direction of the cylinder 20 determines the maximum device dimension of the air actuator 100 for valves. In an air actuator for a valve 100 having such dimensional relationships, the region above the long cylinder 20 is likely to become dead space. To effectively utilize this dead space, therefore, a flange portion 33 provided on the top cover 32 of the housing 30 is provided so as to protrude in the extension direction of the cylinder 20 up to the region above the cylinder 20. In this manner, various external attachments M are attached to the upper surface 30a of the upper cover 32, including the upper surface of the enlarged flange portion 33, by effectively utilizing the dead space in the upper region of the cylinder 20. In order to prevent an increase in the size of the air actuator 100 for valves in the vertical direction, which is the direction of the valve shaft or drive shaft 51, the gap G between the flange portion 33 and the cylinder 20 is adjusted to be as small as possible.

[0037] The cylinder 20 has a connecting flange 22 that is connected to the housing body 31 . The connecting flange 22 has an outer shape such that the peripheral side surface 22b is substantially flush with the peripheral side surface 31b of the housing body 31 when the connecting flange 22 and the housing body 31 are connected by overlapping the connecting end surfaces 22a, 31a. In this embodiment, the outer shape of the connection side end of the housing body 31 is substantially rectangular, and the outer shape of the connection flange 22 is also substantially rectangular corresponding to this shape. A part of the peripheral side surface 22b of the connecting flange 22 forms a surface 20a facing a thickness adjusting surface portion 33b provided on the flange portion 33, and forms a gap G1 between the flange portion 33 and the surface 20a.

[0038] The connecting flange 22 has bolt holes 22c formed at its four corners, into which bolts (not shown) for connecting and fixing the cylinder 20 to the housing body 31 are screwed. Furthermore, the connecting flange 22 has four notches 22d formed around the bolt holes 22c.

[0039] Each notch 22d is formed by cutting out a part of the connecting flange 22 from the peripheral side surface 22b of the connecting flange 22 inward while ensuring the wall thickness around the bolt holes 22c. Therefore, in the air actuator 100 for a valve, a part of the connection side end face 31a of the housing body 31 is exposed through each of the cutout portions 22d. In other words, the cylinder 20 can be made lighter by using the cutout portions 22d as recesses. Furthermore, when separating the housing body 31 and the cylinder 20 for maintenance or the like, the housing body 31 and the cylinder 20 can be easily separated by pressing a tool in the separation direction against the connecting side end face 31a of the housing body 31 exposed through each cutout portion 22d. In this embodiment, an example is given of a connecting flange 22 having four notches 22d formed therein, but the notches 22d may be formed at positions that ensure the strength around the bolt holes 22c, and the number and positions of the notches 22d may be adjusted as appropriate.

[0040] <Painting the Air Actuator 100 for Valves> Here, the effect of providing the thickness adjusting surface portion 33b on the flange portion 33 in painting the air actuator for a valve 100 will be described with reference to Figs. In this description, the effect obtained by providing the cylinder side thickness adjusting surface portion 33b out of the two thickness adjusting surface portions 33b, 33bb will be described. 4 and 5 are diagrams for explaining the effect of providing the thickness adjusting surface portion 33b on the flange portion 33 in painting the air actuator 100 for a valve. The air actuator 100 for valves is assembled by connecting and assembling multiple divided housings, such as the housing 30 and the cylinder 20, and the outer surface of the assembly is spray painted using a spray gun S. Therefore, it is necessary to paint the small gap G between the flange portion 33 and the cylinder 20.

[0041] First, using Figure 4, we will explain the difference in the finished state of the paint when painting a conventional air actuator for a valve 500 that does not have a cylinder side thickness adjustment surface portion 33b on the flange portion 33 (see Figures 4(b) and 4(c)), and when painting the air actuator for a valve 100 of this embodiment 1 that has a cylinder side thickness adjustment surface portion 33b on the flange portion 33 (see Figure 4(a)). In Figure 4, in order to visually show that the painting conditions for the comparison are identical, the diffusion state of the paint ejected from the spray gun S is shown by 20 dashed lines, and the angles of each dashed line extending from the paint ejection port S2 of the nozzle S1 are made equal. In addition, in FIG. 4, the distances between the spray gun S and the air actuator for a valve 100 in the lateral direction in the drawing are set to be equal. Here, the painted area within the gap G will be described as being divided into three areas: area A1 on the upper surface where the cylinder side thickness adjustment surface portion 33b is formed, area A2 on the lower surface opposite the cylinder side thickness adjustment surface portion 33b, and area A3 on the innermost surface that vertically connects the end positions within the gap G of area A1 on the upper surface and area B2 on the lower surface.

[0042] In the air actuator 100 for a valve of this embodiment 1, when paint is sprayed from a spray gun S positioned at an angle to the gap G, that is, when paint is sprayed diagonally from above toward the area A2 on the underside, as shown in Figure 4(a), six dashed lines indicating the diffusion state of the paint (hereinafter referred to as diffusion paint indication lines) reach the surface of the housing 10 within the gap G. More specifically, two diffusion paint marking lines reach the cylinder side thickness adjustment surface portion 33b in the upper surface area A1, two diffusion paint marking lines reach the surface area A3 at the innermost end of the gap G, and two diffusion paint marking lines reach the lower surface area A2 opposite the cylinder side thickness adjustment surface portion 33b.

[0043] On the other hand, in the case of a conventional air actuator 100 for a valve, as shown in FIG. 4(b), when paint is sprayed toward the gap G from a spray gun S positioned approximately in front of the gap G, the three diffusion paint marking lines reach the surface of the housing 10 within the gap G. More specifically, one diffusion paint marking line reaches area A1 on the upper surface, one paint diffusion line reaches area A3 on the surface at the innermost end of the gap G, and one diffusion paint marking line reaches area A2 on the lower surface.

[0044] In the conventional air actuator for valves 100, when paint is sprayed from a spray gun S positioned at an angle to the gap G, that is, when paint is sprayed diagonally from above toward the area A2 on the underside, as shown in Figure 4(c), the three diffusion paint marking lines reach the surface of the housing 10 within the gap G. More specifically, two diffusion paint marking lines reach the area A3 of the surface at the innermost end of the gap G, one paint diffusion line reaches the area A2 of the lower surface, and not a single diffusion paint marking line reaches the area A1 of the upper surface.

[0045] In other words, when painting the conventional air actuator for valve 500 using a spray gun S with the same performance as that used to paint the air actuator for valve 100 of this embodiment 1, it is difficult to paint to the same extent as the air actuator for valve 100 of this embodiment 1, even if the application angle of the spray gun S with respect to the gap G is changed. That is, in the air actuator 100 for a valve of this embodiment 1, when spray painting is applied to the gap G using a spray gun S or the like, paint is sprayed from diagonally above from the wide opening inlet G1 toward the underside area A2 facing the thickness adjustment surface portion 33b, so that the underside area A2 is effectively painted, while in the upper surface area A1 where the thickness adjustment surface portion 33b is provided, the thickness adjustment surface portion 33b facing the inlet is effectively painted, and moreover, the paint penetrates into the interior through the gap space that expands from the back side toward the inlet G1 side, so that the area A3 at the innermost surface of the gap G and even the surrounding area of ​​the thickness adjustment surface portion 33b are effectively painted. On the other hand, in the conventional air actuator for valves 500, the narrow wall of the gap entrance prevents paint from entering the gap, so when paint is sprayed diagonally from above onto one side of the gap, it is difficult for the paint to reach the other opposing side, making it difficult to evenly paint area A1 on the top surface of the gap G, area A2 on the bottom surface, and area A3 on the innermost surface in a single application. In this case, repeated painting may be considered, but this is not preferable in terms of quality because it tends to cause uneven painting.

[0046] Furthermore, in this embodiment 1, the thickness adjustment surface portion 33b is formed in approximately the central region in the width direction of the flange portion 33 when viewed from the front with the protruding tip surface of the flange portion 33 as the front, so that the thickness of the base end portion 33c is ensured at both ends of the flange portion 33 from the rear side of the gap G to the entrance G1 side. In other words, when flange portion 33 is viewed with the protruding tip surface of flange portion 33 facing forward, the cross section has a downward U-shape. Since both ends of flange portion 33 are prone to stress when bolts are inserted, etc., their strength can be easily maintained by ensuring the thickness. Moreover, when viewed as a whole, flange portion 33 is surrounded on three sides by parts having sufficient thickness, so that the thick parts function like ribs, preventing deflection due to the weight of external equipment attached to flange portion 33. For this reason, it may be thought that it would be difficult to paint both ends of the flange portion 33, but since these are ends, they can be painted evenly by painting from a direction facing the end side. In other words, in the air actuator 100 for valves, the flange portion 33 needs to have strength, and while the thickness is ensured for the portions that are easy to paint, the thickness adjustment surface portion 33b is provided so that the strength is not affected and the portions that are difficult to paint can be painted evenly within a specified time.

[0047] Next, using Figure 5, it will be explained that when painting the air actuator for a valve 100 of this embodiment 1, which has a cylinder side thickness adjustment surface portion 33b on the flange portion 33, the effect of being able to insert the tip of the nozzle S1 of the spray gun S into the gap G to make painting easier can be obtained.

[0048] In the air actuator 100 for a valve according to the first embodiment, by providing the thickness adjusting surface portion 33b on the flange portion 33, the entrance G1 of the gap G is opened larger than in the conventional air actuator for a valve. As a result, the air actuator 100 for valves is capable of applying paint by inserting the tip of the nozzle S1 of the spray gun S into the gap G, which was previously difficult to do. Therefore, as can be seen by comparing Figures 5(a) and 5(b), high-density paint is sprayed into the gap G from the tip of the nozzle S1 of the spray gun S, so that the surface of the housing 10 within the gap G can be painted evenly.

[0049] <Effects of the First Embodiment> As described above, in the housing structure 1 of the valve device according to the first embodiment, the flange portion 33 is provided on the housing 10 as a base around the drive shaft 51, the flange portion 33 protrudes into the area facing the surface 20a of the housing 10, and the flange portion 33 has a thickness adjustment surface portion 33b on the surface facing the surface 20a of the housing 10, which is an inclined surface that gradually widens the gap G between the flange portion 33 and the surface 20a of the housing 10 from the rear side toward the inlet side. As a result, in the region where the thickness adjustment surface portion 33b is provided, the thickness of the flange portion 33 is formed to be thicker on the base end portion 33c side, which is the back side of the gap G, and is formed to gradually become thinner from the base end portion 33c toward the protruding tip portion 33d side. In the region where the thickness adjustment surface portion 33b is provided, the gap G between the flange portion 33 and the surface 20a of the housing 10 gradually expands from the rear side toward the entrance G1 side, and is largest at the entrance G1, and the thickness adjustment surface portion 33b, which becomes the painted surface, is positioned with the inclined surface facing the entrance G1 side. Therefore, while the base end portion 33c of the flange portion 33 ensures sufficient strength as a seat, the thickness of the portion that is unlikely to affect the strength is reduced to enlarge the opening on the inlet G1 side. When spray painting is applied to the gap G between the flange portion 33 of the housing 10 and the surface 20a of the housing 10 using a spray gun S or the like, paint is sprayed from the wide opening inlet G1 toward the area of ​​the surface 20a facing the thickness adjustment surface portion 33b with the paint nozzle S2 directed diagonally from above, thereby effectively painting the surface 20a, while in the surface area where the thickness adjustment surface portion 33b is provided, the thickness adjustment surface portion 33b facing the inlet is effectively painted, and moreover, the paint penetrates into the interior through the gap space that expands from the back side toward the inlet G1 side, thereby effectively painting the back side of the gap G and even the surrounding area of ​​the thickness adjustment surface portion 33b. Therefore, the gap G between the housing 10 and the flange portion 33 provided as a base on the housing 10 can be painted evenly.

[0050] Furthermore, according to the valve device housing structure 1 of embodiment 1, by providing the flange portion 33 with the thickness adjustment surface portion 33b, the flange portion 33 is formed gradually thinner in the region where the thickness adjustment surface portion 33b is provided from the base end portion 33c, which is the back side of the gap G1, toward the protruding tip end portion 33d. This reduces the amount of material used for the flange portion 33, thereby enabling material costs to be reduced.

[0051] Furthermore, according to the valve device housing structure 1 of embodiment 1, the housing 10 is assembled by connecting the cylinder 20, the housing main body 30, and the top cover 32, and the flange portion 33 is provided on the top cover 32 so as to protrude toward the connected cylinder 20, and the thickness adjustment surface portion 33b is provided on the surface 33a facing the cylinder 20. Therefore, the gap G between the cylinder 20 and the flange portion 33 of the casing 10 assembled by connecting the cylinder 20, the housing body 30, and the top cover 32 can be painted evenly.

[0052] Furthermore, according to the air actuator 100 for a valve of embodiment 1, the housing 10 is provided with a flange portion 33 protruding into an area facing the surface 20a of the housing 10, and an external attachment mounting surface portion 30b for mounting an external attachment M to the upper surface of the housing 10 including the flange portion 33, and the flange portion 33 has a thickness adjustment surface portion 33b on the surface 33a facing the surface 20a of the housing 10, which is in the form of an inclined surface that gradually widens the gap G with the surface 20a of the housing 10 from the rear side toward the entrance G1 side. Therefore, while the base end 33c of the flange portion 33 ensures sufficient strength to withstand the load of the external attachment M, the thickness is reduced in areas where the strength is not likely to be affected, and the opening on the inlet G1 side is enlarged. When spray painting is applied to the gap G between the flange portion 33 of the housing 10 and the surface 20a of the housing 10 using a spray gun or the like, in the area where the thickness adjustment surface portion 33b is provided, paint can be sprayed from the large opening of the inlet G1 toward the back side, and paint can also be sprayed onto the surface facing the inlet G1 side.

[0053] Furthermore, in the air actuator 100 for a valve of embodiment 1, the housing 10 is assembled by connecting a plurality of divided housings, namely, the cylinder 20, the housing main body 31 and the top cover 32, and the flange portion 33 is provided on the top cover 32 so as to protrude towards the cylinder 20 to which it is connected, and the thickness adjustment surface portion 33b is provided on the surface facing the cylinder 20. Therefore, it is possible to paint evenly within the gap G between the flange portion 33, which is provided on its upper surface as a base for mounting an external attachment, and the cylinder 20 to which it is connected.

[0054] Furthermore, in the air actuator 100 for a valve of embodiment 1, the split housing having the flange portion 33 is the top cover 32 of the housing 30 which accommodates the drive shaft 51, and the connected split housing is the cylinder 20 which accommodates the air-driven piston 40 and is connected to the housing 30 so as to extend in the direction of movement of the piston 40, and the flange portion 33 has a cylinder side thickness adjustment surface portion 33b in at least one direction, with the protruding tip portion 33d which protrudes in the extension direction of the cylinder 20 to the upper region of the cylinder 20 serving as the entrance G1 of the gap G. As a result, the flange portion 33 effectively utilizes the upper region of the cylinder 20 extending in the direction of movement of the piston 40 to enlarge its upper surface 30a, which serves as the mounting surface for external attachments, and the cylinder side wall thickness adjustment surface portion 33b, which is provided in a direction extending to the upper region of the cylinder 20, opens the gap G largest at the inlet G1 in the upper region of the cylinder 20. As a result, the upper surface 30a of the flange portion 33, which is expanded greatly to the upper region of the cylinder 20, is secured widely as a mounting surface for external attachments, while paint can be applied evenly to the gap G between the expanded flange portion 33 and the cylinder 20, which is the other divided housing with which it is connected.

[0055] Furthermore, according to the air actuator 100 for a valve of embodiment 1, the divided housings of the housing 10, that is, the cylinder 20, the housing body 31, and the top cover 32, are cast parts, so that when the housing 10 is molded by casting, the cylinder 20, the housing body 31, and the top cover 32, which are divided into multiple parts, can be molded separately. Therefore, according to the air actuator 100 for a valve of embodiment 1, by connecting the top cover 32 having the flange portion 33 and its connecting partner, the cylinder 20, via the housing main body 31, a small gap G can be provided between the flange portion 33 and the cylinder 20 in the assembled housing 10, and it is possible to obtain the effect that paint can be applied evenly within the gap G by the cylinder side thickness adjustment surface portion 33b.

[0056] In addition, the manufacturing method for the valve device according to the first embodiment includes a thickness adjustment surface forming step of forming a thickness adjustment surface 33b, which is an inclined surface, on the surface 33a of the flange portion 33 facing the surface 20a of the housing 10, so that the gap G between the surface 20a of the housing 10 and the surface 20a of the housing 10 gradually increases from the rear side toward the inlet side, and an oblique painting step of spraying paint from diagonally above the surface 20a of the housing 10 facing the thickness adjustment surface 33b, with the paint nozzle S2 directed toward the surface 20a of the housing 10, when painting the gap G between the surface 33a of the flange portion 33 on which the thickness adjustment surface 33b is formed and the surface 20a of the housing 10. As a result, in the region where the thickness adjustment surface portion 33b is provided, the thickness of the flange portion 33 is formed to be thicker on the base end portion 33c side, which is the back side of the gap G, and is formed to gradually become thinner from the base end portion 33c toward the protruding tip end side. In the region where the thickness adjustment surface portion 33b is provided, the gap G between the flange portion 33 and the surface 20a of the housing 10 gradually expands from the back side toward the entrance side, and is largest at the entrance G1, and the thickness adjustment surface portion 33b, which becomes the painted surface, is positioned with the inclined surface facing the entrance side. Therefore, while the base end 33c of the flange portion 33 ensures sufficient strength as a seat, the thickness of the portion that is less likely to affect the strength is reduced to enlarge the opening on the inlet side. When spray painting is applied to the gap G between the flange portion 33 of the housing 10 and the surface 20a of the housing 10 using a spray gun or the like, paint is sprayed from the wide opening inlet G1 toward the area of ​​the surface 20a facing the thickness adjustment surface portion 33b with the paint nozzle S2 directed diagonally from above, thereby effectively painting the surface 20a, while in the surface area where the thickness adjustment surface portion 33b is provided, the thickness adjustment surface portion 33b facing the inlet G1 is effectively painted, and moreover, the paint penetrates into the interior through the gap space that expands from the back toward the inlet, thereby effectively painting the back side of the gap G and even the surrounding area of ​​the thickness adjustment surface portion 33b. Therefore, the gap G between the housing 10 and the flange portion 33 provided as a base on the housing 10 can be painted evenly.

[0057] <Variation 1> Here, a first modified example of the thickness adjusting surfaces 33b, 33bb of the air actuator 100 for a valve according to the first embodiment will be described with reference to FIG. FIG. 6 is a diagram showing a first modified example of the thickness adjusting surfaces 33b and 33bb. In addition, in the first modification, the same components as those in the first embodiment are designated by the same reference numerals, and redundant explanations will be omitted. The thickness adjusting surfaces 33f, 33ff of this modified example 1 differ from the thickness adjusting surfaces 33b, 33bb of the air actuator 100 for a valve of the first embodiment in that they have a curved shape.

[0058] The thickness adjusting surface portions 33f, 33ff of this modified example 1 have a curved shape on the surface 33a facing the cylinder 20 to which the housing 30 is connected, such that the gap G with the cylinder 20 gradually increases from the back side toward the entrance G1 side.

[0059] <Effects of Modification 1> The thickness adjusting surfaces 33f, 33ff of the first modified example can achieve the same effects as the thickness adjusting surfaces 33b, 33bb of the air actuator 100 for a valve according to the first embodiment. That is, according to the thickness adjusting surfaces 33f, 33ff of the first modification, the gap G between the flange portion 33 provided as a seat on the housing 10 and the surface 20a of the housing 10 can be painted evenly.

[0060] <Variation 2> Next, a second modified example of the thickness adjusting surfaces 33b, 33bb of the air actuator 100 for a valve according to the first embodiment will be described with reference to FIG. FIG. 7 is a diagram showing a second modified example of the thickness adjusting surfaces 33b and 33bb. In addition, in the second modification, the same components as those in the first embodiment are designated by the same reference numerals, and redundant explanations will be omitted. The thickness adjusting surfaces 33b, 33bb, 33g, 33gg, 33h, and 33hh of this modified example 2 differ from the thickness adjusting surfaces 33b and 33bb of the air actuator 100 for a valve of the first embodiment in that a plurality of them are provided in different directions.

[0061] The thickness adjustment surface portions 33b, 33g, and 33h of this modified example 2 are provided in multiple directions from the back side of the gap G between the housing 30 and the cylinder 20, which is the divided housing to which it is connected, toward the entrances G1, G2, and G3 in multiple different directions. In addition, in the second modification, "the entrances G1, G2, G3 of the gap G" refer to the entrances on the front side and both side sides of the gap G when the protruding tip surface of the flange portion 33 is regarded as the front. More specifically, when the protruding tip surface of flange portion 33 on the cylinder 20 side is viewed from the front, thickness adjustment surface portion 33b is formed in approximately the central region of the width direction of flange portion 33, with the front side being an inlet G1, and two-directional thickness adjustment surface portions 33g, 33h are formed from the back side of gap G toward the inlets G2, G3 at both ends of the width direction of flange portion 33, with the inlets G2, G3 at both ends. These three thickness adjustment surface portions 33b, 33g, 33h are provided to avoid the area around the screw hole 33e in order to ensure a predetermined thickness around the screw hole 33e for fixing an external attachment. Similarly, the flange portion 33 protruding on the side opposite to the cylinder 20 side is also provided with thick-walled surface portions 33bb, 33gg, and 33hh.

[0062] <Effects of Modification 2> According to the thickness adjustment surfaces 33b, 33g, and 33h of the second modified example, the flange portion 33 is provided with three thickness adjustment surfaces 33b, 33g, and 33h formed from the rear side of the gap G toward the entrances G1, G2, and G3 in multiple different directions. As a result, the thickness around the base end 33c of the flange portion 33 is ensured to be thick to provide strength, while thin portions are formed in multiple locations that are unlikely to affect the strength of the flange portion 33, and the entrances G1, G2, and G3 in different directions of the gap G are opened wide. Therefore, when spray painting is applied using a spray gun S or the like to the gap G between the flange portion 33 of an assembly assembled by connecting multiple divided housings and the cylinder 20, which is the connected divided housing, the spray painting can be applied through multiple inlets G1, G2, G3 that are opened widely in multiple directions. Moreover, according to the thickness adjusting surfaces 33b, 33g, and 33h of the second modified example, the provision of a plurality of thickness adjusting surfaces 33b, 33g, and 33h makes it possible to further reduce material costs.

[0063] (Embodiment 2) Finally, a valve 200 having a valve device housing structure 2 according to a second embodiment will be described with reference to FIG. FIG. 8 is a cross-sectional view of a valve 200 having a valve device housing structure 2 according to the second embodiment. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and redundant explanations will be omitted. The valve device housing structure 2 of the second embodiment differs from the valve device housing structure 1 of the first embodiment in that it is applied to a housing 210 of a valve 200 instead of an air actuator for a valve. In the valve device housing structure 2 of embodiment 2, a body 220, which is one of a plurality of divided housings 220, 230, has a through hole 222 in the axial direction of a valve shaft 240, and the valve shaft 240 passes through this through hole 222. The body 220 is provided with a flange portion 221 which serves as a seat around the valve shaft 240 and protrudes toward the body cap 230 which is a separate housing to be connected. The flange portion 221 has a thickness adjusting surface portion 221b on a surface 221a facing the body cap 230 to be connected thereto, the thickness adjusting surface portion 221b being inclined such that the gap G between the body cap 230 and the flange portion 221 gradually increases from the rear side toward the entrance G1 side.

[0064] <Regarding the housing 210 of the valve 200> The housing 210 has a body 220 that houses a valve shaft 240 and a valve body 250 connected to the end of the valve shaft 240, and a body cap 230 that forms an outlet side flow path with respect to the body 220 and is connected to extend the housing 210 in a direction approximately perpendicular to the valve shaft 240. In the second embodiment, the body 220 and the body cap 230, which are separate housings constituting the housing 210, are manufactured by casting. The body 220 and the body cap 230, which are the divided housings, may be manufactured by a manufacturing method other than casting. For example, the body 220 and the body cap 230 may be manufactured by cutting, or various manufacturing methods may be combined.

[0065] <About Body 220> The body 220 is a separate housing that is connected to a body cap 230 to form a part of the housing 210 of the valve 200 .

[0066] A valve shaft 240 and a valve element 250 are provided inside the body 220. In the second embodiment, a ball valve is used as the valve element, but other valve elements such as a butterfly valve may be used, and a valve element other than a rotary valve may be used. The valve shaft 240 has one lower end connected to the valve body 250 , and the upper end of the other end protrudes from the inside to the outside of the body 220 through a through hole 222 formed in the upper surface 220 a of the body 220 .

[0067] An upper surface 220a of the body 220 serves as a seat surface on which an operating lever 260 of the valve 200 can be freely disposed. The upper part of the body 220 has an enlarged upper surface by a flange portion 221, so that an external attachment such as a valve opening / closing indication plate (not shown) can also be attached.

[0068] The flange portion 221 is provided so as to protrude in the outer radial direction of the valve shaft 240 . Here, in the valve 200 having the housing structure 2 of the valve equipment of this embodiment 2, the gap G between the underside 221a of the flange portion 221 and the upper surface of the body cap 230 is kept small in order to make the device compact. However, since the body 220 and the body cap 230 are each provided separately, even if the gap G is small, it is easy to form by casting. In particular, even in the case of a valve 200 having the valve device housing structure 2 of this embodiment 2, in which a thickness adjustment surface portion 221b is provided in the gap G on the underside 221a side of the flange portion 221, casting is easy to perform.

[0069] In addition, the flange portion 221 has a thickness adjustment surface portion 221b formed in an inclined surface shape on the surface 221a of the flange portion 221 that faces the body cap 230, which is the divided housing to which it is connected, i.e., on the underside 221a of the flange portion 221, so that the gap G with the body cap 230 gradually widens from the back side toward the entrance G1 side.

[0070] <About Body Cap 230> The body cap 230 is a separate housing that is connected to the body 220 to form a part of the housing 210 of the valve 200, and has a part of the outlet side flow path. In order to prevent an increase in the vertical dimension of the valve 200, the gap G between the flange portion 221 and the body cap 230 is adjusted to be as small as possible.

[0071] <Effects of the second embodiment> As described above, in the valve 200 having the valve equipment housing structure 2 of embodiment 2, the flange portion 221 is provided as a base around the valve shaft 240, and the flange portion 221 protrudes into an area facing the surface 230a of the body cap 230 which is the divided housing to be connected to, and the flange portion 221 has a thickness adjustment surface portion 221b on the surface 221a facing the surface 230a of the body cap 230 to be connected to, such that the gap G with the surface 230a of the body cap 230 gradually widens from the back side toward the inlet G1 side. As a result, the thickness of the flange portion 221 is ensured to be a predetermined thickness on the side of the base end portion 221c which is the inner side of the gap G, and is formed to be gradually thinner from the base end portion 221c toward the protruding tip portion 221d. A gap G between the flange portion 221 serving as a base and the body cap 230 to which the body 220 having this flange portion 221 is connected gradually expands from the back side toward the entrance G1 side, and opens largest at the entrance G1. For this reason, sufficient strength is ensured at the base end 221c of the flange portion 221, while the thickness of the portion that is unlikely to affect the strength is reduced to enlarge the opening on the inlet G1 side. When spray painting is applied to the gap G between the flange portion 221 of the housing 210 and the surface 230a of the housing 210 using a spray gun S or the like, paint is sprayed from the wide opening inlet G1 toward the area of ​​the surface 230a facing the thickness adjustment surface portion 221b with the paint nozzle S2 directed diagonally from above, so that the surface 230a is effectively painted. Meanwhile, in the surface area where the thickness adjustment surface portion 221b is provided, the thickness adjustment surface portion 221b facing the inlet G1 is effectively painted, and moreover, the paint penetrates into the interior through the gap space expanded from the back side toward the inlet G1 side, so that the back side of the gap G and even the peripheral area of ​​the thickness adjustment surface portion 221b are effectively painted. Therefore, the gap G between the housing 10 and the flange portion 221 provided as a base on the housing 10 can be painted evenly.

[0072] Furthermore, in the valve 200 having the valve device housing structure 2 of embodiment 2, by providing the flange portion 221 with the thickness adjustment surface portion 221b, the flange portion 221 is formed gradually thinner in the region where the thickness adjustment surface portion 221b is provided, from the base end portion 221c, which is the back side of the gap G1, towards the protruding tip end portion 221d. This reduces the amount of material used for the flange portion 221, and enables material costs to be reduced.

[0073] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure.

[0074] For example, in the above embodiment, the housing 10, 210 forming the outer shell of the valve air actuator 100 or the valve 200 is assembled by connecting a plurality of divided housings, but the housings 10, 210 may not be divided and the whole or a part of the housing may be formed as a single unit. For example, the housing main body 31 and the top cover 32 of the valve air actuator 100 may be formed as a single unit. [Explanation of symbols]

[0075] 1, 2 Valve equipment housing structure 10, 210 case 20 cylinders 20a surface 21 Airport 22 Connecting flange 22a Connection side end face 22b Circumferential side 22c Bolt hole 22d Notch 30 Housing (split housing) 30a, 220a top surface 30b External attachment mounting surface 31 Housing body (split housing) 31a Connection side end face 31b Circumferential side 32 Top cover (split housing) 33, 221 Flange part 33a, 221a Bottom surface (surface) 33b, 33bb Thickness adjustment surface 33f, 33ff Thickness adjustment surface 33g, 33gg wall thickness adjustment surface 33h, 33hh Thickness adjustment surface 221b Thickness adjustment surface 33c, 221c proximal end 33d, 221d protruding tip 33e Screw hole 34, 222 Through hole 40 Piston 41 Piston rod 50 Rotation conversion mechanism 51 Drive shaft 52 Scotch York G Gap G1, G2, G3 entrance S spray gun S1 Nozzle S2 paint spout 220 Body (split housing) 230 Body Cap (split case) 230a surface 240 Valve stem 250 Valve body 260 Operating Lever 100 Air Actuator for Valve 200 Valve M External attachment

Claims

1. In a housing structure of a valve device, a flange portion is provided on a housing as a seat around a valve shaft or a drive shaft, and the flange portion protrudes into an area facing a surface of the housing, a housing structure for a valve device, characterized in that the flange portion has, on the surface facing the surface of the housing, a wall thickness adjustment surface portion having an inclined or curved shape that gradually widens the gap with the surface of the housing from the back side toward the inlet side.

2. the housing is assembled by connecting a plurality of divided housings, the flange portion is provided on one of the plurality of divided housings so as to protrude toward the connected divided housing, 2. The housing structure for a valve device according to claim 1, wherein the thickness adjusting surface portion is provided on a surface facing the divided housing of the connecting partner.

3. An air actuator for a valve is provided with a flange portion on the housing that protrudes into an area facing the surface of the housing as a seat around a drive shaft, and an external attachment mounting surface portion for mounting an external attachment on the top surface of the housing including the flange portion, An air actuator for a valve, characterized in that the flange portion has a thickness adjustment surface portion on the side facing the surface of the housing, the thickness adjustment surface portion being inclined or curved so that the gap with the surface of the housing gradually increases from the back side toward the inlet side.

4. the housing is assembled by connecting a plurality of divided housings, the flange portion is provided on one of the plurality of divided housings so as to protrude toward the connected divided housing, 4. The air actuator for a valve according to claim 3, wherein the thickness adjusting surface portion is provided on a surface facing the divided housing of the connecting partner.

5. the split housing having the flange portion is a housing that accommodates the drive shaft, and the connected split housing is a cylinder that accommodates an air-driven piston and is connected to the housing so as to extend in the moving direction of the piston, 5. The air actuator for a valve according to claim 4, wherein the flange portion has a thickness adjustment surface portion in at least one direction, with an end portion that protrudes in the extension direction of the cylinder to an upper region of the cylinder as the entrance of the gap.

6. 4. The air actuator for a valve according to claim 3, wherein the flange portion has thickness adjustment surfaces in a plurality of directions formed from the deep side of the gap toward the inlet side in a plurality of different directions.

7. 7. The air actuator for a valve according to claim 4, wherein the divided housing is a casting.

8. A method for manufacturing a valve device, the method comprising: providing a flange portion on a housing of the valve device as a seat around a valve stem or a drive shaft; and applying coating to the housing of the valve device, the flange portion protruding into an area facing a surface of the housing; a thickness adjusting surface forming step of forming a thickness adjusting surface having an inclined or curved shape on a surface of the flange portion facing the surface of the housing, the gap between the surface of the housing gradually increasing from the back side toward the entrance side; a diagonal painting step in which, when painting the gap between the surface of the flange portion on which the thickness adjustment surface portion is formed and the surface of the housing, paint is sprayed from diagonally above the surface of the housing facing the thickness adjustment surface portion with a paint nozzle directed toward the surface of the housing.

Images