JP4337070B2 - Globe valve drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for driving a globe valve with a linear actuator such as a hydraulic cylinder, and more particularly to adjustment when the axial centers of the linear actuator rod and the stem of the globe valve are displaced.
[0002]
[Prior art]
FIG. 5 is a diagram schematically showing the configuration of the globe valve.
The body 1 is provided with a flow path from the inlet 2 to the outlet 3, and a cylindrical space 4 is provided at the center thereof. A hollow cylindrical cage 5 is fitted in the cylindrical space 4. A lower portion of the cage 5 is a cylindrical opening 6 from which a fluid flows. A cylindrical plug 7 is fitted on the inner surface of the cage 5. A round bar shaped stem 8 is connected to the plug 7, and the flow area of the cylindrical opening 6 is increased / decreased by adjusting the stem 8 up and down to adjust the flow rate. A packing 9 is provided in the stem 8 through portion of the body 1 to prevent leakage. The plug 7 is provided with a balance hole 10 so that the inside of the cylindrical space 4 has the same pressure and the movement of the plug 7 is made smooth.
[0003]
When the globe valve is driven by a hydraulic cylinder, the stem 8 is extended and connected to the hydraulic cylinder rod. FIG. 5 shows a hydraulic cylinder drive globe valve. FIG. 6A shows the appearance, and FIG. 6B shows the valve drive mechanism. When the hydraulic cylinder 13 is provided on the globe valve 11, a cylindrical member 12 is provided as an extension member because a manual opening / closing mechanism and an opening / closing position indicating device (not shown) are also provided.
[0004]
As shown in FIG. 6B, the hydraulic cylinder 13 is provided with a flange 15 on the main body 14, the flange 15 is fixed to the top plate 17 of the cylindrical member 12 with bolts, and the hydraulic cylinder rod 16 protrudes perpendicularly to the flange 15 and reciprocates. . The stem 8 of the globe valve 11 and the hydraulic cylinder rod 16 are joined by an extension rod 18 via a connector 19. The central axes of the hydraulic cylinder rod 16, the extension rod 18 and the stem 8 are arranged on the same straight line, and the plug 7 is opened and closed by the movement of the hydraulic cylinder rod 16 in the axial direction.
[0005]
[Problems to be solved by the invention]
When the cylindrical member 12 is inclined with respect to the globe valve 11, the axial center b of the hydraulic cylinder rod 16 and the extension rod 18 is inclined with respect to the axial center a of the stem 8 as shown in FIG. When the stem 8 is driven by the hydraulic cylinder 13 in this state, a lateral pushing force in a direction perpendicular to the axial direction of the stem 8 is generated between the plug 7 and the cage 5 or between the cage 5 and the body 1, so Abnormal noise occurs.
[0006]
The present invention has been made in view of the above-described problems, and provides an apparatus for easily correcting the inclination when the axis of the stem of the globe valve and the axis of the rod of the linear actuator that drives the axis are inclined. For the purpose.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a direct acting actuator for driving a rod is provided on the stem side of the globe valve via a hollow cylindrical extension member, and the stem is connected to the stem within the extension member via the extension rod. In a globe valve drive device that is connected to a direct acting actuator rod and opens and closes the globe valve with the direct acting actuator, the flange that constitutes the mounting surface of the direct acting actuator is joined to the top of the extension member with a bolt, and the screw hole of the flange jack bolt is provided to be screwed in, by adjusting the inclination of the flange by the jack bolts, stems and linear activator eta rods Ri adjustable der so as to be parallel, the extension rod and the horizontal adjustment connector and the stem The horizontal adjustment connector is fixed to the upper member fixed to the extension rod and the stem. A lower member, and a bolt for fastening the upper member and the lower member, and the upper member and the lower side so as to allow a deviation between the axis of the stem and the axis of the extension rod. The members are connected by the bolts .
[0008]
A linear actuator is a general term for a device that electrically reciprocates a hydraulic cylinder, a gas pressure cylinder, and a rod, and may have a flange for mounting to a counterpart. By providing jack bolts at a plurality of locations on the flange and tightening a part of the jack bolt, a gap is generated between the flange and the top of the extension member, and the flange can be inclined. Since the linear actuator rod is orthogonal to the flange, the inclination of the linear actuator rod can be adjusted by adjusting the inclination of the flange so as to be parallel to the stem.
[0009]
In addition, when the linear actuator rod and the extension rod are coaxial, and the stem and the extension rod are parallel and the axes are shifted from each other, they are connected by a connector in a shifted state.
[0010]
If the stem and the extension rod are parallel, no lateral pushing force is generated even if a force is applied to the stem in the axial direction from the linear actuator rod via the extension rod. A moment is generated due to the misalignment between the stem and the extension rod, but the lateral pushing force is small.
[0011]
In the invention of claim 2, a direct acting actuator for driving a rod is provided on the stem side of the globe valve via a hollow cylindrical extension member, and the stem is connected to the direct acting actuator rod via the extension rod in the extension member. In the globe valve driving device that opens and closes the globe valve by the linear actuator, the flange that constitutes the mounting surface of the linear actuator is joined to the top of the extension member with a bolt, and further, a jack bolt that is screwed into the screw hole of the flange is provided. It is possible to adjust the inclination of the flange with jack bolts so that the stem and the linear actuator rod are parallel, and the extension rod and the linear actuator rod are connected by a horizontal adjustment connector. The horizontal adjustment connector includes an upper member fixed to the linear actuator rod and the extension rod. A lower member fixed to the door, and a bolt for fastening the upper member and the lower member so as to allow a deviation between the axis of the extension rod and the axis of the linear actuator rod. The upper member and the lower member are connected by the bolt.
According to a second aspect of the present invention, when the extension rod and the stem are coaxial, and the extension rod and the linear motion actuator rod are parallel and the axes are shifted from each other, they are connected by a connector in a shifted state.
[0012]
If the extension rod and the linear actuator rod are parallel, no lateral pushing force is generated even if a force is applied to the stem in the axial direction from the linear actuator rod via the extension rod. A moment is generated due to the deviation of the axial center between the linear actuator rod and the extension rod, but the lateral pushing force is small.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The globe valve driving apparatus of the present embodiment drives the globe valve with a direct acting actuator. In the embodiment described below, a case where a hydraulic cylinder is used as the direct acting actuator will be described. The same applies when other devices are used. In the present embodiment, an apparatus in which a hydraulic cylinder is attached to the globe valve described in FIG. 6 via a cylindrical member is improved. FIG. 1 shows a joint portion between the hydraulic cylinder 13 and the cylindrical member 12, FIG. 1A is a sectional view, and FIG. 1B is a plan view. The hydraulic cylinder 13 is provided with a flange 15 on the lower surface of a cylindrical main body 14, and a hydraulic cylinder rod 16 passes through the center of the flange 15. A top plate 17 is provided at the top of the cylindrical member 12, and a hydraulic cylinder rod 16 passes through the center.
[0014]
The flange 15 is provided with three bolts 21 and three jack bolts 22 alternately on the same pitch circle. The bolt 21 passes through the bolt hole of the flange 15 and is screwed into the screw hole of the top plate 17. The jack bolt 22 is screwed into the screw hole of the flange 15. The top plate 17 below the jack bolt 22 is a flat surface.
[0015]
As illustrated in FIG. 6, when the cylindrical member 12 is inclined with respect to the globe valve 11, the axial center b of the hydraulic cylinder rod 16 and the extension rod 18 is relative to the axial center a of the stem 8 as illustrated in FIG. 7. Inclined state. Since the connector 19 of the hydraulic cylinder rod 16 and the extension rod 18 is often manufactured with high accuracy, the linearity of the rods 16 and 18 is often maintained. In such a case, in FIG. 1, the bolt 21 is loosened, one or two of the jack bolts 22 are tightened, and the hydraulic cylinder 13 is tilted, so that the axis a of the stem 8 is tilted as shown in FIG. The axial center b of the hydraulic cylinder rod 16 and the extension rod 18 can be made parallel. In this state, the stem 8 and the extension rod 18 are joined by the horizontal adjustment connector 20.
[0016]
Alternatively, as shown in FIG. 4, the stem 8 and the extension rod 18 can be coaxial (axial center a), and the hydraulic cylinder rod 16 (axial center b) can be inclined to be parallel to the extension rod 18. In this state, the hydraulic cylinder rod 16 and the extension rod 18 are joined by the horizontal adjustment connector 20.
[0017]
FIG. 2 shows the configuration of the horizontal adjustment connector. The horizontal adjustment connector 20 includes an upper member 23 and a lower member 24, each of which is divided into two parts. The upper member 23, for example, sandwiches the extension rod 18 and is integrated with a bolt 25. For example, the lower member 24 sandwiches the stem 8 and is integrated by a bolt 26. The upper member 23 is provided with four screw holes 27, and the lower member 24 is provided with four bolt holes 28 at corresponding positions. Assuming that the horizontal displacement between the extension rod 18 and the stem 8 is a, the diameter of the bolt hole 28 is larger than the diameter of the bolt 30 to absorb this displacement a. For example, when the bolt diameter is 16 mm, if the diameter of the bolt hole is 20 mm, a horizontal shift of 4 mm can be absorbed. This connects the stem 8 and the extension rod 18 as shown in FIG. Further, when the hydraulic cylinder rod 16 is sandwiched between the upper member 23 and the extension rod 18 is sandwiched between the lower member 24, the extension rod 18 and the hydraulic cylinder rod 16 are connected as shown in FIG.
[0018]
As described above, when the axes of the stem 8 and the extension rod 18 are inclined with respect to each other, the extension rod 18 is made parallel to the stem 8 by the jack bolts 22, and the horizontal shift caused by this is caused by using the horizontal adjustment connector 20. By absorbing, it is possible to reduce the lateral pushing force on the globe valve and prevent the generation of abnormal noise. Further, when the axial centers of the extension rod 18 and the hydraulic cylinder rod 16 are inclined with each other, the hydraulic cylinder rod 16 is made parallel to the extension rod 18 by the jack bolt 22, and a horizontal shift caused thereby is caused by the horizontal adjustment connector 20. By absorbing with the use of this, it is possible to reduce the lateral pushing force to the globe valve and prevent the generation of abnormal noise.
[0019]
【The invention's effect】
As is clear from the above description, the present invention adjusts the linear actuator rod parallel to the stem of the globe valve by providing a jack bolt on the flange of the linear actuator and inclining the flange. In addition, the horizontal displacement between the stem and the linear actuator rod is absorbed by using the leveling connector to reduce the lateral pushing force applied to the globe valve plug and cage, cage and body, and to prevent the generation of abnormal noise. Can do. In particular, the reduction of the lateral pushing force suppresses the generation of scratches due to the sliding of the plug and enables the life of the globe valve to be extended. Further, the simplification of the adjustment of the shaft misalignment by the jack bolt can reduce the man-hour required for the adjustment.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing the engagement between a hydraulic cylinder and a top of a cylinder, where (A) is a cross-sectional view and (B) is a plan view.
FIG. 2 is a diagram showing a configuration of a horizontal adjustment connector.
FIG. 3 shows a state in which the stem and the extension rod are adjusted in parallel.
FIG. 4 shows a state in which a hydraulic cylinder rod and an extension rod are adjusted in parallel.
FIG. 5 is a diagram showing a configuration of a globe valve.
6A and 6B are diagrams in which a hydraulic cylinder is attached to a globe valve, FIG. 6A is an external view, and FIG. 6B is an internal configuration.
FIG. 7 shows a state in which the extension rod and the hydraulic cylinder rod are inclined with respect to the stem.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body 5 Cage 7 Plug 8 Stem 11 Globe valve 12 Cylindrical member 13 Hydraulic cylinder 14 Main body 15 Flange 16 Hydraulic cylinder rod 17 Top plate 18 Extension rod 19 Connector 20 Horizontal adjustment connector 21 Bolt 22 Jack bolt 23 Upper member 24 Lower member 27 Screw Hole 28 Bolt hole 30 Bolt

Claims (2)

A direct acting actuator that drives the rod via a hollow cylindrical extension member is provided on the stem side of the globe valve, and the stem is connected to the linear actuator rod via the extension rod in the extension member. In the globe valve driving device that opens and closes the valve,
The flange that constitutes the mounting surface of the linear motion actuator is joined to the top of the extension member with a bolt, and a jack bolt that is screwed into the screw hole of the flange is further provided. Ri adjustable der to activator eta rod is parallel, and the stem and the extension rod is coupled by leveling connector,
The horizontal adjustment connector includes an upper member fixed to the extension rod, a lower member fixed to the stem, and a bolt that fastens the upper member and the lower member. The globe valve drive device , wherein the upper member and the lower member are connected by the bolt so as to allow a shift between a center and an axial center of the extension rod . A direct acting actuator that drives the rod via a hollow cylindrical extension member is provided on the stem side of the globe valve, and the stem is connected to the linear actuator rod via the extension rod in the extension member. In the globe valve driving device that opens and closes the valve,
The flange that constitutes the mounting surface of the linear motion actuator is joined to the top of the extension member with a bolt, and a jack bolt that is screwed into the screw hole of the flange is further provided. The actuator rod can be adjusted to be parallel, and the extension rod and the linear actuator rod are connected by a horizontal adjustment connector,
The horizontal adjustment connector includes an upper member fixed to the linear actuator rod, a lower member fixed to the extension rod, and a bolt that fastens the upper member and the lower member, The globe valve driving device , wherein the upper member and the lower member are connected by the bolt so as to allow a deviation between an axial center of the extension rod and an axial center of the linear actuator rod .

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