JPH0527442U - Valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the valve plug at the tip of the valve shaft that is slidably held by the cylindrical plug guide from rotating due to the valve opening / closing operation or the flow of the controlled fluid. .. [Structure] A large-diameter valve plug 3 is provided at a tip portion of a valve shaft 4 slidably fitted and held by a cylindrical plug guide 5 provided in a valve body 1. The valve plug 3 is moved forward and backward by the seat ring 7 provided on the partition wall 8 in the valve body 1, so that the flow port 7a is controlled to be opened and closed. Then, at least one engagement pin 10 is erected parallel to the valve shaft on the step portion 3a on the valve shaft side of the large-diameter valve plug. Further, an engagement hole 11 is formed in the end face of the plug guide on the seat ring side, into which the engagement pin is inserted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve device suitable for use as a control valve for controlling the flow rate of various controlled fluids.

[0002]

[Prior Art]

 Conventionally, as this type of valve device, a flow control valve having a structure as shown in FIG. 2 is known. This will be briefly described. In the figure, reference numeral 1 is a valve body, 2 is an upper lid mounted on the upper portion by a bolt, and this upper lid 2 has a valve shaft 4 having a valve plug (valve body) 3 at its tip. The rod portion 4a penetrates and is supported so as to be slidable upward and downward. The valve shaft 4 is slidably supported in a cylindrical plug guide 5 fixed to the valve body 1 side, and its rod portion 4a is a shaft seal provided in the lid 2. The unit 6 is supported while maintaining liquid tightness. Reference numeral 7 in the drawing is a flow port 7a which is provided in an opening formed in a partition wall 8 which partitions a fluid passage formed in the valve body 1 and which is located on the same axis as the valve plug 3 at the tip of the valve shaft 4. It is a seat ring (valve seat) having. The fluid control operation of the valve device having such a configuration is well known, and the description thereof is omitted.

By the way, in the above-described valve device, the valve plug 3 faces the controlled fluid in the valve body 1 and is moved up and down via the valve shaft 4 to control the opening / closing of the flow port 7a of the seat ring 7. Therefore, it may vibrate or rotate around the valve shaft 4 due to the influence of this valve opening / closing operation, the flow or turbulent flow of the controlled fluid, and the pressure fluctuation caused by the differential pressure associated with the valve opening / closing amount. There is a fear that it is necessary to stop the rotation. Therefore, conventionally, as shown in FIG. 2, key grooves 9a and 9b are formed in the outer peripheral portion of the valve shaft 4 and the inner peripheral portion of the plug guide 5 that holds the valve shaft 4, and the key 9 is interposed. Then, the structure in which the valve shaft 4 is held by the plug guide 5 slidably only in the axial direction, and as a result, the valve plug 3 is prevented from rotating has been generally adopted.

[0004]

[Problems to be solved by the device]

 However, in the above-described detent structure using the key 9, the key grooves 9a and 9b are formed by cutting on the outer peripheral portion of the valve shaft 4 on the valve plug 3 side and the inner peripheral portion of the valve guide 5 that holds the same. However, there was a problem that the processing work was troublesome and costly. In particular, the work of forming the key groove 9b in the inner peripheral portion of the valve guide 5 is troublesome and the accuracy cannot be obtained. Further, there is a problem in terms of assemblability, and these problems can be further ameliorated. It is hoped that some measures will be taken. Further, in the above-described conventional structure, it is necessary to secure the wall thickness of the valve shaft 4 and the valve guide 5 by the amount of forming the key grooves 9a and 9b, and the diameter dimension in these portions becomes large, so that the valve This is an obstacle to the miniaturization of the vehicle, and it is desirable to consider such points.

[0005]

[Means for Solving the Problems]

 In order to meet such a demand, the valve device according to the present invention is provided at a tip end portion of a valve shaft slidably fitted and held in a cylindrical plug guide provided in the valve body, and the valve shaft moves forward and backward. It is equipped with a large-diameter valve plug that controls the opening and closing of the seat ring flow port provided in the partition wall of the valve body. At least one engaging pin is provided on the step portion of the large-diameter valve plug on the valve shaft side. Is erected parallel to the valve shaft, and has an engagement hole formed in the end face of the plug guide on the seat ring side to receive the engagement pin.

[0006]

[Action]

 According to the present invention, the engaging pin is erected parallel to the valve shaft on the step portion on the valve shaft side of the valve plug, and the engaging pin is inserted into the engaging hole formed in the cylindrical plug guide. By fitting and holding the valve shaft in the plug guide, the valve plug portion can be assembled.

[0007]

【Example】

 FIG. 1 shows an embodiment of the valve device according to the present invention, and shows only the main components. The structure other than that shown in this figure is the same as that of the valve device shown in FIG. 2 described above, and a detailed description thereof is omitted.

Now, according to the present invention, in the valve device having the above-described structure, the valve shaft 4 which is slidably fitted and held in the cylindrical plug guide 5 provided in the valve body 1 is provided at the tip end portion thereof. The valve shaft 3 is provided with a large-diameter valve plug 3 that is moved forward and backward by the valve shaft 4 to control the opening and closing of the flow port 7a of the seat ring 7 provided in the valve body partition wall 8. At least one engagement pin 10 is erected parallel to the valve shaft 4 on the step portion 3a on the fourth side, and is opened at the end surface of the plug guide 5 on the seat ring 7 side so that the engagement pin 10 is engaged. The feature is that the engaging hole 11 to be inserted is formed.

Here, the length of the engagement pin 10 and the length of the engagement hole 11 are set to such a length that the engagement between the two does not come off according to the amount of movement of the valve plug 3 described above. Good. Further, the engagement pin 10 may be fixed to the step portion 3a of the valve plug 3 by adopting an appropriate fixing method such as screw connection or welding.

According to such a configuration, the rotation prevention of the valve plug 3 can be achieved by extremely simple processing and assembling work of attaching the engaging pin 10 and forming the engaging hole 11. The processing cost can be reduced compared to the conventional key connection, and the diameter of the plug guide 5 that holds the valve plug 3 and the valve shaft 4 can be reduced to the minimum necessary, resulting in a small size of the entire valve. In addition, there are few protrusions and voids that affect the flow of fluid in the fluid passage, and there is no effect on the fluid flow.

It should be noted that the present invention is not limited to the structure of the embodiment described above, but the shape, structure, etc. of each part of the valve device can be appropriately modified and changed, and various modified examples can be considered.

[0012]

[Effect of the device]

 As described above, according to the valve device of the present invention, the valve shaft provided at the tip of the valve shaft slidably fitted and held in the cylindrical plug guide provided in the valve body is moved forward and backward by the valve shaft. It is equipped with a large-diameter valve plug that controls the opening and closing of the seat ring flow port provided in the partition wall of the valve body, and at least one engagement is provided on the step portion on the valve shaft side of this large-diameter valve plug. Since the pin is erected in parallel with the valve shaft and the engaging hole is formed in the end face of the plug guide on the seat ring side, the engaging pin is inserted. In addition, it is possible to prevent the valve plug from rotating with extremely simple processing and assembly work, and not only is it inexpensive, but it also minimizes the diameter dimension of this valve plug and plug guide, resulting in the entire valve. Also downsized There is Rutoitta practically excellent effect.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of a valve device according to the present invention.

FIG. 2 is a schematic side sectional view showing a conventional example of a valve device to which the present invention is applied.

[Explanation of symbols]

 1 Valve Main Body 2 Upper Lid 3 Valve Plug 3a Step 4 Valve Shaft 5 Cylindrical Plug Guide 7 Seat Ring 7a Flow Port 8 Partition Wall 10 Engagement Pin 11 Engagement Hole

Claims (1)

[Scope of utility model registration request] 1. A seat ring provided on a partition wall of a valve main body, a cylindrical plug guide fixed to the valve main body, and a distal end portion of a valve shaft slidably fitted and held by the plug guide. A valve device comprising a large-diameter valve plug, and controlling the opening and closing of the flow port of the seat ring by advancing and retracting the valve plug by a valve shaft, wherein a step portion on the valve shaft side of the large-diameter valve plug is provided. , At least one engagement pin is erected parallel to the valve shaft, and an engagement hole is formed in the end face of the plug guide on the seat ring side, and the engagement pin is formed in the engagement hole. A valve device characterized by being inserted inside.