JP2016044720A - Actuator for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator for a valve which can manufacture one type while reducing the number of components by commonalizing a drive portion for both a dual operation type and a spring return type, and which can acquire a necessary valve drive direction and power necessary for the drive even in the case of being provided at any type.SOLUTION: An actuator for a valve incorporates a rotation mechanism part 2, and it has a housing 1 on which a dual operation type cylinder part 3 or a spring return type cylinder part 4 are mounted on a side part. When molding a roughly shaped material of the housing 1, a flange part 13 for mounting and connecting components 10 such as a limit switch and a positioner at upper and lower parts of the housing 1 and the flange part 13 for mounting and connecting a valve 12 are molded integrally, and both flange parts 13, 13 are located outside from an outer diameter of the cylinder parts 3, 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a part-turn type valve actuator that operates by air pressure, and more particularly to an actuator that can be used as a double-acting type or a spring return type.

  Conventionally, as a valve actuator operated by air pressure, a double-acting type in which both opening and closing operations are performed by supplying air pressure, and rotating operation in one direction is supplied by air pressure, and rotating operation in the opposite direction is supplied. Two types of spring return type, which are performed by the spring force of a built-in spring when exhausting the generated air pressure, are widely used. Further, in this type of actuator, a housing part in which a rotational drive part for rotationally driving the valve and a cylinder part having a pneumatic cylinder are incorporated in each body independently, and a rotation mechanism part, In many cases, the pneumatic cylinder part is built in an integral body.

For example, a valve actuator disclosed in Patent Document 1 is disclosed as an actuator in which a rotation mechanism portion and a pneumatic cylinder portion are integrally configured. In this actuator, a cylinder is formed in a cylindrical shape, and a rotation mechanism such as a piston, a piston arm, and a scotch yoke is built in the cylinder.
On the other hand, for example, a pneumatic actuator disclosed in Patent Document 2 is disclosed as a spring return type in which a rotation mechanism portion and a pneumatic cylinder portion are integrally formed. In this actuator, a rotation mechanism portion including a cylinder, a piston, and the like and a spring member including a coil spring are mounted in the cylinder.
On the other hand, for example, the actuators of Patent Documents 3 and 4 are disclosed as a spring return type in which the rotation mechanism unit and the pneumatic cylinder unit are configured independently. In this actuator, a rotating mechanism portion including an arm, a pin, and the like is provided in a cylinder having a piston, and a pneumatic device in which a spring device including a spring, a spring piston, and a spring rod is built in either of the left and right sides of the cylinder. The cylinder part is provided so that attachment is possible.

JP 2006-183748 A JP 2002-161901 A Japanese Patent No. 3184174 Japanese Patent No. 3350522

  In the double-acting type and spring-return type valve actuators described above, these parts are shared, even though the functions of the rotary drive part and the roles of the components of this rotary drive part are common. Rather, each type of actuator is individually manufactured according to the use location, valve performance, and the like. Therefore, when these actuators are manufactured, there is a problem that the total number of parts increases, resulting in an increase in manufacturing cost and a wasteful cost.

For example, in the case of Patent Document 1, since the rotary drive unit and the pneumatic cylinder unit are built in a cylinder integrated into a cylindrical shape, it is not possible to provide a spring return type with a common cylinder. Also in Patent Document 2, since the cylinder is an integral type and the rotation mechanism and the spring member are mounted in the cylinder, it is not possible to provide a double-acting type actuator with a common cylinder.
In the actuators of Patent Documents 3 and 4, the rotation mechanism portion and the pneumatic cylinder portion are provided separately. However, the components are not used in common and can be used as a double operation type.

  The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is to reduce the number of parts by making the drive part common to both the double action type and the spring return type. However, an object of the present invention is to provide a valve actuator which can be manufactured in any type and can provide a necessary driving direction of the valve and a rotational force required for driving the valve in any type.

  In order to achieve the above object, the invention according to claim 1 is a valve actuator having a housing with a built-in rotation mechanism portion and a double-acting cylinder portion or a spring return cylinder portion attached to a side portion thereof. When molding the housing material, the flange part that mounts and connects the limit switch and positioner and other parts on the upper and lower parts of the housing and the flange part that mounts and connects the valve are integrally molded. Is a valve actuator that is positioned outside the outer diameter of the cylinder portion.

  The invention according to claim 2 is the valve actuator in which the base portion of the flange portion is formed in a concave shape to form a concave portion, and the housing portion for housing the connecting portion between the cylinder portion and the housing is provided in the concave portion.

  The invention according to claim 3 is the valve actuator in which the base material of the housing is cast molding, and machining is performed on the base material to form at least the processing surfaces of both flange portions.

  According to a fourth aspect of the present invention, there is provided a valve actuator having a cylinder portion having substantially the same output when the cylinder bore diameter of the spring return cylinder portion attached to the side portion of the housing is lowered and replaced with a double-acting cylinder portion. It is.

  According to a fifth aspect of the present invention, there is provided a valve actuator in which screw holes are drilled so that components or valves can be mounted and connected at corresponding positions of both flange portions of the housing.

  The invention according to claim 6 is the valve return valve according to any one of claims 1 to 5, wherein the spring return type flange portion has a spring disposed between the rod guide and the piston to fix the end of the piston rod. Actuator.

  According to the first aspect of the present invention, the housing part on the drive side is used in common by attaching either the double-acting cylinder part or the spring return cylinder part to the side part of the housing incorporating the rotation mechanism part. It is possible to manufacture either a double-acting type or a spring return type while greatly reducing the number of parts on the housing side. Moreover, when molding the housing shape material, the flanges for component parts and valve mounting are integrally molded, and these flanges are outside the outer diameter of the cylinder part, so that either side flange part can be Valves can be connected without difficulty, and the drive direction of the spring return type cylinder can be changed by changing the flange on the valve connection side. Alternatively, it is possible to obtain a torque required at the time of output by attaching a spring return type cylinder portion.

  According to the second aspect of the present invention, the overall weight can be reduced by forming the concave portion at the base portion of the flange portion, and the connecting portion between the cylinder portion and the housing can be accommodated in the accommodating portion provided by the concave portion. Since a double-acting or spring return type cylinder can be mounted, the length in the mounting direction can be shortened when any cylinder is provided, and the overall size can be reduced.

  According to the invention of claim 3, since the insertion hole of the shaft for driving the valve rotation can be drilled in the housing according to the valve mounting direction by machining after the casting is formed, or the valve mounting surface can be cut and processed by casting in advance. The housing can be used as a double-acting or spring return type housing.

  According to the invention of claim 4, by adjusting the cylinder bore diameter, the same housing having the common rotation mechanism portion is used, and either the spring return type cylinder portion or the double acting type cylinder portion is directly assembled to this housing. By attaching, it becomes possible to provide a spring return type or double action type valve actuator having substantially the same output.

  According to the fifth aspect of the present invention, the screw holes are machined after the housing is formed by simple machining, and components or valves can be mounted and connected to both the upper and lower portions of the housing. Thus, if the flange is formed symmetrically in the vertical direction and the cylinder is attached to the housing with the housing turned upside down so that the rotation direction of the rotation mechanism is opposite to the valve, the spring return operation Can be set to either clockwise or counterclockwise.

  According to the invention of claim 6, since it is not necessary to provide a special case for storing the spring, the number of parts can be reduced, and the spring mounting portion is provided between the rod guide and the piston separating the rotation mechanism portion and the cylinder portion. By doing so, the structure is such that the repulsive force of the spring is fixed on the fixing side of the piston rod and the piston, so that the spring does not jump out due to the repulsive force when the spring return type cylinder portion is removed from the housing. Since the compressed spring can be visually recognized from the outside with the cylinder part removed, inadvertent disassembly can be prevented.

It is a front view which shows embodiment of the actuator for valves of this invention. It is a front view which shows the state which mounted the valve actuator of FIG. 1 in the valve | bulb. FIG. 2 is a perspective view of FIG. 1. It is a front view which shows the base material of the housing before machining. FIG. 2 is a central cross-sectional view of FIG. 1. It is a center cross-sectional view of an actuator whose spring return operation is opposite. It is AA sectional drawing of FIG. It is a center cross-sectional view which shows the state which mounted | wore the double action | operation type cylinder part. It is a front view which shows other embodiment of the actuator for valves of this invention.

Embodiments of a valve actuator according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a front view of an embodiment of the valve actuator of the present invention, and FIG. 3 is a perspective view. The valve actuator in the present invention has a housing 1, and the housing 1 has a rotation mechanism portion 2 built in, and the side portion thereof has a double-acting cylinder portion 3 shown in FIG. A spring return type (single-acting type) cylinder part 4 is attached. Thus, the actuator housing 1 (rotating mechanism 2) and the cylinders 3 and 4 are provided independently. First, the case where the spring return type | mold cylinder part 4 is attached to the side part of the housing 1 is demonstrated.

  2 and 3, the base material of the housing 1 is formed by casting, and cast iron is used as a material. The base material is subjected to machining such as drilling, screw hole processing, and surface cutting. The When molding the base material of the housing 1, flange portions 13 to which a valve 12 such as a ball valve or a butterfly valve can be connected are formed integrally with the upper and lower portions of the housing 1, respectively. Further, on both wings of each flange portion 13, flange portions 11, 11 to which component parts 10 such as limit switches and positioners can be mounted and connected are integrally formed. Both flange portions 11 and 13 are arranged so that the outer diameters of the cylinder portions 3 and 4 are different even when either the double-acting cylinder portion 3 or the spring return cylinder portion 4 is attached to the housing 1. It forms so that it may be located outside.

At least the processed surfaces of the flange portions 13 and 13 and the flange portions 11 and 11 are formed by machining the above-described shaped material.
In this case, in the base material of the housing 1 before machining shown in FIG. 4, the upper side of the upper portion of the housing 1 is removed from the upper side of the two-dot chain line by machining. A placement surface 13a of the opening display plate 24 and a placement surface 11a of the component 10 are formed. In the present embodiment, the placement surface 13a and the placement surface 11a are formed on the same plane.

  The lower part of the housing 1 is removed from the lower side of the two-dot chain line by machining, thereby forming the valve mounting surface 13b, the fitting convex portion 21, and the flange surface 11b. In the present embodiment, the valve mounting surface 13b and the flange surface 11b are formed on the same plane.

  As shown in FIG. 7, a shaft insertion hole 14 is formed in the housing 1 by machining with a drilling machine (not shown) penetrating through the upper and lower flange portions 13 and 13. In the drawing, the shaft insertion hole 14 is provided in a small diameter hole 14a on the upper side of the housing 1 and a large diameter hole 14b having a larger diameter on the lower side than the small diameter hole 14a.

  In FIG. 1 and FIG. 2, concave portions 15, 15 provided in a concave shape are formed at the base portions of the upper and lower flange portions 11, 13, and the cylindrical portion 3 or the cylinder portion 4 is formed in the concave portion 15. The housing 16 is provided with a housing portion 17 in which the end flange 16a of the cylinder portion 3 and the end flange (not shown) of the cylinder portion 4 are housed. The upper and lower flange portions 11 and 13 are provided in a substantially symmetrical shape, and the concave portion 15 is also formed in a substantially symmetrical shape in the vertical direction. Thereby, even when the housing 1 is turned upside down, the cylinder portion 4 (cylinder portion 3) can be attached to the concave portion 15.

  As shown in FIG. 3, screw holes 20 are formed in the upper flange portion 11 by screw hole processing at positions corresponding to component parts 10 such as a switch box with a built-in limit switch and positioner. On the other hand, the component 10 is provided so as to be mountable. In the case of this embodiment, a screw hole to which the component 10 is mainly connected is provided on the end side of the flange portion 11. When the screw hole 20 for the component 10 is formed according to the international standard, the component 10 such as a limit switch or a positioner can be directly mounted while conforming to the international standard.

  An annular fitting convex portion 21 is formed by projecting on the lower flange portion 13 to which the valve 12 is mounted and connected, and the fitting convex portion 21 of the bracket 22 for connecting and mounting the valve 12 shown in FIG. The fitting hole 23 is provided so as to be fitted. By fitting the fitting convex portion 16 and the fitting hole portion 18, the valve 12 and the actuator are connected in an aligned state via the bracket 22. The lower flange portion 13 is provided with a screw hole 13a corresponding to a bolt 22a for fixing the bracket 22.

On the other hand, as shown in FIGS. 1 to 3, a valve opening degree indicator plate 24 is attached to a screw hole (not shown) via a screw 25 on the mounting side of the upper flange portion 13, that is, the component 10. The valve opening degree indication plate 24 and the indicator 26 mounted on the upper portion of the shaft 32 can display the valve opening degree of the valve 12.
Although not shown, the upper and lower flange portions 11, 11 may be formed in a step portion that is one step lower than the flange portion 13 as necessary. In this case, the lower flange portion 11 particularly interferes with the bracket 22. The bottom surface of the lower flange portion 13 and the top surface of the bracket 22 can be brought into close contact with each other.

  In FIGS. 5 and 6, stopper bolt insertion holes 27 each having a screw hole are formed in the side portion of the housing 1 so as to penetrate the two portions. The stopper bolt insertion hole 27 is drilled in two of the four seats 28 formed on the side of the housing 1 according to the mounting direction of the shaft 32, the upper side seat 28a or the lower side seat 28b. When the small-diameter shaft 32a of the shaft 32 is on the upper side of the housing 1 and the large-diameter shaft 32b is on the lower side as in the present embodiment shown in FIG. 7, it is formed on the lower side seat portion 28b. On the other hand, when the small diameter shaft 32a of the shaft 32 is on the lower side of the housing 1 and the large diameter shaft 32b is on the upper side, a stopper bolt insertion hole 27 is formed in the upper side seat portion 28a.

The rotation mechanism 2 provided in the housing 1 includes a piston rod 30, a locking pin 31 fixed to the piston rod 30, a shaft 32, a scotch yoke 33, and a stopper bolt 34.
The piston rod 30 is attached to the housing 1 so as to be able to reciprocate, and a locking pin 31 protrudes from a predetermined position of the piston rod 30 in a direction perpendicular to the reciprocating direction. In the present embodiment, the case where the piston rod 30 operates in the direction against the elastic force of the spring 35 described later is defined as the forward movement, and the case where the piston rod 30 operates in the direction of the elastic force of the spring 35 is defined as the backward movement.

  The small-diameter shaft 32a of the shaft 32 is inserted into the small-diameter hole 14a of the shaft insertion hole 14 and protrudes upward from the flange portion 11 on the component part 10 mounting side, and the large-diameter shaft 32b is inserted into the large-diameter hole 14b. It protrudes to the lower surface side from the flange portion 13 on the valve 12 connection side. A step 32c is formed between them, and the shaft 32 is attached to the shaft insertion hole 14 so as to be rotatable in a direction perpendicular to the piston rod 30 in a predetermined attachment direction. A rotary shaft of the valve 12 is provided on the large diameter shaft 32b so as to be connectable. A scotch yoke 33 is integrally attached to the outer periphery of the shaft 32 via a key 36 and is provided so as to be rotatable integrally with the shaft 32.

  The scotch yoke 33 is formed with a concave engaging portion 33 a, and the engaging portion 33 a is engaged with the locking pin 31. The engagement between the locking pin 31 and the engaging portion 33a causes the scotch yoke 33 to rotate so as to be pushed by the locking pin 31 by the reciprocating motion of the piston rod 30, and this rotation causes the shaft 32 integrated with the scotch yoke 33 to rotate. Rotates. Thereby, the reciprocating motion of the piston rod 30 is converted into the rotational motion of the shaft 32 via the scotch yoke 33.

  The stopper bolt 34 is attached to the stopper bolt insertion hole 27 by screwing, and the rotation range of the scotch yoke 33 is restricted by contacting the side portion of the rotated scotch yoke 33 with the stopper bolt 34. The stopper bolt 34 is provided so that the protruding length on the contact side of the scotch yoke 33 can be adjusted by adjusting the screwing amount. By finely adjusting the protruding length, the rotational operation range of the scotch yoke 33 is set finely. The rotation angle can be set. In this case, as shown in FIG. 7, the stopper bolts 34 are mounted in two stopper bolt insertion holes 27 formed on the lower side, so that the piston rod 30 on the power transmission side in the height direction and the driven force The stopper bolt 34 is disposed at an intermediate position with respect to the large-diameter shaft 32b on the transmission side, and stable position regulation is performed when the scotch yoke 33 contacts.

  In FIG. 5, the spring return type cylinder portion 4 attached to the housing 1 has a cylinder case 40, a rod guide 41, and a piston 42, and a spring 35 is attached thereto. The cylinder case 40 is formed in a cylindrical shape, and is provided with a communication port 43 so as to communicate with the inside. One communication port 43 is used as an intake / exhaust port so that compressed air from the outside can be sucked into and exhausted into the cylinder portion 4, and the other communication port 43 has a water intrusion prevention member via an attachment portion 44. 45 is attached.

  The rod guide 41 is sandwiched between the opening of the cylinder case 40 and the opening of the housing, and a through hole 46 is formed at the center thereof. The through hole 46 is formed to have a diameter slightly larger than the outer diameter of the piston rod 30, and the rod guide 41 side is attached to the housing 1 with the piston rod 30 passing through the through hole 46. By mounting the cylinder part 4 to the housing 1 via the rod guide 41, the cylinder part 4 can be reciprocated while the piston rod 30 is guided to be aligned by the through hole 46 of the rod guide 41.

  The piston 42 is fixed to the piston rod 30 by fastening a male screw 30a provided at the end of the piston rod 30 and a nut 47, and an O-ring 48 for sealing with the inner peripheral side of the cylinder case 40 is provided on the outer periphery of the piston 42. It is installed.

  The spring 35 is disposed in a resilient state between the rod guide 41 and the piston 42, and the piston 42 is urged in the backward movement direction by these springs 35. As a result, when compressed air is sucked and exhausted from the communication port 43, the piston 42 moves forward in the cylinder case 40, and on the other hand, the spring force of the spring 35 is applied to return the piston 42 together with the piston 42. When 30 operates, it is converted into a rotation operation of the shaft 32 via the rotation mechanism section 2.

  The water intrusion prevention member 45 is formed in a substantially cylindrical shape, and is attached so that the inside of the cylinder portion 4 and the outside air can communicate with each other. Inside the water intrusion prevention member 45, a large diameter portion (not shown) is formed so as to expand from the communication side, and air is sucked into the cylinder portion 4 from the communication port 43 by the operation of the piston 42. When this occurs, the flow velocity during intake is provided so as to be reduced. As a result, even when rainwater or the like adheres to the vicinity of the opening of the water intrusion prevention member 45, such as when the actuator is installed outdoors, the flow rate during intake is suppressed, so that Intrusion is prevented.

  The shaft insertion hole 14, the screw hole 20, the fitting hole 23, the stopper bolt insertion hole 27, and the like described above are formed on the base material after the housing 1 is formed by casting, depending on the mounting direction of the housing 1. It is provided with various machining.

  Although not shown, a groove having a width of about 4 mm for connecting the component 10 is provided on the upper end surface of the shaft 32 according to international standards as necessary. This groove is preferably provided in the minimum necessary width, and in this case, there is no possibility of misidentifying this groove as a groove indicating the flow direction of the valve 12, and thereby the above-described valve opening degree indication plate 24 and It becomes easy to visually check the indicator 26 and it becomes easy to judge the open / closed state of the valve 12.

  When the actuator is assembled by attaching the cylinder portion 4 to the housing 1 described above, in FIG. 7, first, the engaging portion 33 a is engaged with the locking pin 31 and the piston rod 30 is connected to the scotch yoke 33. Housed inside. At this time, the key 36 is housed in the housing 1 while being inserted into the shaft 32 mounting portion of the Scotch yoke 33.

  Next, the shaft 32 is inserted into the shaft insertion hole 14 on the lower side of the housing with the small diameter shaft 32b on the upper side and the large diameter shaft 32a on the lower side, whereby the stepped portion 32c is locked to the shaft mounting end surface side of the scotch yoke 33. The position of the shaft 32 relative to the scotch yoke 33 and the housing 1 is determined. In this state, a C-type retaining ring 49 for fixing is attached to the upper portion of the shaft 32, and the vertical position of the shaft 32 is fixed. At this time, the connection is completed by attaching the key 36 between the shaft 32 and the scotch yoke 33.

  At that time, as shown in FIG. 5 or FIG. 6, the spring return type actuator described above can be opened and closed in a roughly divided manner when the stem is rotated clockwise when the valve 12 is viewed from above. There are two types, one that closes when rotated counterclockwise. Therefore, two types of spring return type actuators are required: one that rotates clockwise when air pressure is released to the atmosphere, and one that rotates counterclockwise.

  In this case, machining is performed on the base material with the housing 1 facing upside down to form the shaft insertion hole 14 and the screw hole 20, and the component 10 and the valve 12 are switched upside down with respect to the housing 1. It becomes possible to cope with the valves 12 having different opening and closing directions. FIG. 5 shows a case where the stem (shaft 14) rotates and closes clockwise, and FIG. 6 shows a case where the stem (shaft 14) rotates and closes counterclockwise. In this case, the mounting positions of the two stopper bolts 34 described above are changed according to the mounting direction of the shaft 32.

  In the assembled actuator, the flange 11 at the lower part of the housing 1 is used for restricting the position of a heat insulating material (not shown) provided to keep the valve 12 warm after the connection of the valve 12 shown in FIG. In this case, it is used to indicate the upper limit of the heat insulating material when the outer periphery of the valve 12 is covered with the heat insulating material.

Next, the case where the double-acting cylinder portion 3 is attached to the valve actuator will be described.
FIG. 8 shows a valve actuator in which a double-acting cylinder portion 3 is attached to a side portion of the housing 1 in which the rotation mechanism portion 2 is built. This actuator is a double-acting type, and two communication ports 43 communicating with the outside provided in the cylinder portion 3 serve as intake and exhaust ports, and air pressure is alternately supplied to both sides of the internal piston 42 through these communication ports 43. The lever piston 42 reciprocates. By the reciprocation of the piston 42, the scotch yoke 33 is rotated through the piston rod 30 and the locking pin 31, and the shaft 32 integrated with the scotch yoke 33 is rotated, so that both the opening operation and the closing operation by air pressure are performed. Is performed.

  In this actuator, a rod guide 51 for double operation is used, and a seal ring 50 that is an O-ring is provided between the inner peripheral surface of the through hole 46 of the rod guide 51 and between the rod guide 51 and the cylinder case 40. Are installed, and the inside of the cylinder portion 3 is sealed by the seal ring 50. When the actuator is provided, the spring return type rod guide 41 is formed in advance so that the outer diameter of the spring return type rod guide 41 is larger than the outer diameter of the double operation type rod guide 51. It becomes impossible to insert into the actuating rod guide 51, and erroneous assembly can be prevented. As a result, leakage of the operating air pressure from the through hole 46 is reliably prevented, and an accurate double operation by the double operation cylinder unit 3 is obtained.

  When changing the operation mode of the actuator, the output torque of the double-acting actuator is about twice that of the case of the spring return type using the cylinder case 40 of the same volume in the housing 1 having the same rotation mechanism 2. Therefore, the size of the cylinder part may be changed in order to operate the same valve 12 while eliminating this.

  That is, if the cylinder bore diameter φd2 of the spring return type cylinder part 4 is made lower than the cylinder bore diameter φd1 of the double action type cylinder part 3, the output torque is substantially the same when the double action cylinder part 3 is replaced. Is obtained. Specifically, if each cylinder bore diameter φd1 and φd2 is provided so that the double-acting cylinder portion 3 is approximately one half of the thrust of the spring return-type cylinder portion 4, the output of the double-acting actuator Torque can be made almost equal to the output torque of the spring return actuator. For this purpose, the cylinder bore diameters φd1 and φd2 are set so that the volume of the cylinder case of the double-acting actuator is halved relative to the cylinder case of the spring return actuator.

  By providing in this way, the cylinder part 3 as a whole can be made compact while obtaining the same output torque in the case of the double action type compared to the spring return type, and the flange part 13 for mounting the valve 12 of the cylinder part 3; Interference with the flange portion 11 for the component 10 can be prevented. Moreover, a common housing can be used by making the output torques of the spring return type and the double action type substantially equal.

Next, the operation of the above-described embodiment of the valve actuator of the present invention will be described.
The valve actuator of the present invention has a housing 1 with a built-in rotation mechanism portion 2, and a double-acting cylinder portion 3 or a spring return cylinder portion 4 can be attached to the side portion of the housing 1. The number of parts can be reduced by using the housing 1 and the internal rotation mechanism 2 in common, and the rotational force can be reduced by reducing the cylinder bore diameter of the double-acting type rather than the spring return type so that the output is substantially the same. It can be mounted on the same valve 12 while being set to be substantially the same.

  When molding the shape material of the housing 1, the flange portions 13, 13 are integrally provided at the upper and lower portions of the housing 1, so that the arbitrary flange portion 13 side is mounted for the component 10 or the valve 12. Can be used for In this case, in the case of the spring return type, it is possible to set either a clockwise or counterclockwise spring return operation by switching the housing 1 upside down.

  Since the flange portions 13 and 13 are positioned outside the outer diameter of the cylinder portions 3 and 4, the valve 12 can be directly connected to any flange portion 13, or any flange portion 13 can be connected. In addition, it is possible to connect the valve 12 via the bracket 22 and the yoke, and there are few restrictions on the size and shape of the bracket 22 and the yoke.

  When one flange portion 13 is on the valve mounting side, the other flange portion 13 is on the component 10 mounting side, and machining is performed on the flange portions 11 provided on both wings of the other flange portion 13, thereby limiting the limit. It becomes possible to directly mount components 10 such as a switch and a positioner.

FIG. 9 shows another embodiment of the valve actuator of the present invention. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In this embodiment, as in the actuator of FIG. 6, the stem (shaft 14) rotates and closes counterclockwise (clockwise and counterclockwise), and the stopper bolt 34 and the communication port 43 are closed. Are arranged on the same side surface side. In this case, the flange surfaces and the like may be formed by machining after the shape of the housing of FIG. 4 is turned upside down. When the housing shape member is turned upside down, as shown in FIG. 9, the upper side seat portion 28a of FIG. 1 is disposed on the lower side, and the lower side seat portion 28b of FIG. 1 is disposed on the upper side. It becomes.
Since the mutual arrangement position of the stopper bolt 34 and the communication port 43 can be changed in this way, even when the housing 1 is provided in any state where the shaft 14 rotates clockwise or counterclockwise and closes, It is possible to provide an actuator that can be arranged according to the surrounding piping situation or the like.

DESCRIPTION OF SYMBOLS 1 Housing 2 Rotation mechanism part 3 Double acting cylinder part 4 Spring return type cylinder part 10 Component parts 11, 13 Flange part 12 Valve 15 Concave part 16 Connection part 17 Storage part 20 Screw hole 30 Piston rod 35 Spring 41 Rod guide 42 Piston

Claims (6)

  An actuator for a valve having a housing that incorporates a rotation mechanism part and has a double-acting cylinder part or a spring return cylinder part attached to a side part thereof. The flange part that mounts and connects components such as limit switches and positioners on the upper and lower parts and the flange part that mounts and connects the valves are molded integrally, and both flange parts are positioned outside the outer diameter of the cylinder part. A valve actuator characterized by   2. The valve actuator according to claim 1, wherein a base portion of the flange portion is formed in a concave shape to form a concave portion, and an accommodating portion for accommodating a connecting portion between the cylinder portion and the housing is provided in the concave portion.   3. The valve actuator according to claim 1, wherein the housing material is cast molding, and machining is performed on the material to form at least the processed surfaces of both flange portions. 4.   4. A cylinder having substantially the same output when the cylinder bore diameter of a spring return cylinder portion attached to a side portion of the housing is lowered and replaced with the double-acting cylinder portion according to any one of claims 1 to 3. Valve actuator.   The valve actuator according to any one of claims 1 to 4, wherein a threaded hole capable of mounting and connecting the component part or the valve is provided at corresponding positions of both flange portions of the housing.   The valve actuator according to any one of claims 1 to 5, wherein the spring return cylinder portion has a spring disposed between a rod guide and a piston to fix an end portion of the piston rod.

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