JPH0518535Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stop valve for opening and closing a flow path of a hydraulic device.

[Conventional technology]

Generally, a stop valve is provided in the flow path of hydraulic equipment for the purpose of maintenance of actuators and other hydraulic equipment. For example, as shown in FIG. 4, hydraulic fluid from a hydraulic pump 51 is supplied from a flow path 53 to a head chamber 55 of an operating cylinder 54 via a valve stand 52 including a switching valve, etc.
passes through the flow path 57 and the valve stand 52 to the tank 5.
8, when the piston 59 reaches the stroke end, the switching valve is switched and the hydraulic pump 51
The hydraulic fluid from the head chamber 55 is supplied to the rod chamber 56 from the flow path 57 via the valve stand 52, and the head chamber 55 is supplied to the tank 58 via the flow path 53 and the valve stand 52.
There is a cylinder circuit communicating with the piston 59 to cause the piston 59 to reciprocate. Stop valves 60 and 61 are provided in the flow passages 53 and 57 of such a cylinder circuit for the purpose of maintenance.

[Problem that the invention attempts to solve]

However, sometimes the stop valve is forgotten to open after maintenance is completed, and in this case, not only does the equipment not operate normally, but the equipment may also be damaged due to increased pressure. In addition, since an independent stop valve is provided for each flow path, it is difficult to make the hydraulic system more compact, and two valve opening and closing operations are required for each flow path. It was cumbersome to operate the valve four times.

The present invention was created in view of the above points, and aims to integrate valves with a compact structure, as well as
To provide a stop valve in which the number of valve operations is halved compared to conventional ones, and there is no accident of forgetting to close or open one of the paired valves.

[Means for solving problems]

The configuration of the present invention for achieving this purpose will be explained using the drawings.

A valve stem 2 is inserted into the valve body 1 so as to be freely advanced and retracted, and a first valve body 3 is provided at the tip of the valve stem 2, and a second valve body 5 whose direction is opposite to that of the first valve body 3 is provided in the middle. This second valve body 5 is provided with a means 21 for restraining its rotation and allowing movement only in the axial direction of the valve stem, and a valve seat 13 of the second valve body 5 is attached to the valve body 1. A locking portion 23 is provided to define the lift amount from the flow path 14, 16, 15, 17 for each valve body 3, 5.
is formed.

[Effect]

The second valve body 5 is connected to the locking portion 2 when the flow path is closed.
It is lifted by L from 3. In the illustrated state where both the first valve body 3 and the second valve body 5 close the flow path, if the threaded portion 6 of the valve stem 2 that screws the second valve body 5 is a right-handed thread, the valve stem 2 in the direction of the solid line arrow, the first valve body 3 is in the closed state, that is, the valve seat 1
2, the second valve body 5, whose rotation is restrained, moves in the valve opening direction as shown in FIG. 3, and the valve opens. When the second valve body 5 bottoms out at zero lift, the valve stem 2 will move to the second valve body 5.
, the first valve body 3 moves in the direction of opening it. (FIG. 3C) This opens the first valve body 3. That is, if the valve stem 2 is rotated in the direction of the solid arrow,
First, the second valve body 5 opens, and then the first valve body 3 opens. Therefore, two flow paths can be opened by simply rotating one valve stem 2 in the direction of the solid arrow.

Next, as shown in FIG. 3D, the two valve bodies 3,
If the valve stem 2 is rotated in the direction of the dashed arrow from the open state of the valve 5, as shown in Fig. E, the second valve body 5 whose rotation is restrained moves in the valve closing direction, When the valve closes, the valve stem 2 is guided by the second valve body 5 and moves in the direction of closing the first valve body 3 (Fig. F),
The first valve body 3 closes. That is, when the valve stem 2 is rotated in the direction of the dashed arrow, the second valve body 5 closes,
Then, the first valve body 3 is closed. Therefore, the two flow paths can be closed by simply rotating one valve stem 2 in the direction of the dashed arrow.

Therefore, the stop valve of this invention has two valve bodies 3,
Since the two flow paths can be controlled by operating one valve stem 2 provided with the valve 5, it is possible to make the valve more complex and improve operability with a compact configuration.

〔Example〕

Embodiments of the present invention will be described based on the drawings. 1st
In the figure, a first valve body 3 is provided at the tip of a valve stem 2 that is inserted into a valve body 1 so as to be able to move forward and backward, and a threaded portion 4 is formed in the middle. The threaded portion 6 of the second valve body 5 which is reversed from 3 is screwed together, and the handle 7 is attached to the base end of the valve stem 2.

The second valve body 5 has a key groove 9 formed in the longitudinal direction of the outer peripheral surface of the cylindrical portion 8, and the cylindrical portion 8 is inserted into the bottomed guide hole 10 of the valve body 1. A key 11 is protruded from the guide hole 10 and is inserted into the keyway 9 to restrict rotation of the valve body 5. The reason why the guide hole 10 is a bottomed hole is to define the retraction limit of the valve body 5 separated from the valve seat 13.

When the valve bodies 3 and 5 come into contact with the valve seats 12 and 13, they cut off the communication between the primary flow passages 14 and 15 and the secondary flow passages 16 and 17, and when they separate from the valve seats 12 and 13, they disconnect the primary flow passages 14 and 15, respectively. 15 and the secondary flow paths 16 and 17 into the liquid chamber 1.
8 and 19.

The valve stem 2 is locked to the valve body 1 with a lock nut 20 when the respective flow passages are closed by the valve bodies 3 and 5 and when the respective flow passages are opened.

FIG. 2 shows the conventional stop valve 60 shown in FIG.
This is a cylinder circuit in which a stop valve 22 according to the present invention is provided in place of the stop valve 61.

It should be noted that the stop valve according to the present invention is not limited to the embodiments illustrated, and may be modified in various ways within the scope of the gist. For example, the key connection between the second valve body 5 and the valve body 1 may be replaced with a spline connection. Also, the ports of the primary flow paths 14 and 15 or the secondary flow paths 16 and 17 are oriented in the same direction,
The ports of the flow paths 14, 15, 16, and 17 may all be oriented in the same direction.

[Effect of idea]

As is clear from the above explanation, according to the present invention, two flow paths are closed by one-way operation of one valve rod equipped with two valve bodies, and two flow paths are opened by the opposite operation. Therefore, the functions of two stop valves can be obtained with one stop valve, the number of valve operations is halved compared to conventional products, and the hydraulic system can be made more compact. Therefore, the compact structure greatly improves operability, making it suitable for hydraulic systems that require a large number of stop valves.
In addition, there will be no accidents caused by forgetting to close or open one of the paired valves.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an embodiment of the present invention, Fig. 2 is a hydraulic circuit diagram of an embodiment of the invention, Fig. 3 is a diagram for explaining the operation of the present invention, and Fig. 4 is a hydraulic system equipped with a conventional product. It is a circuit diagram. 1... Valve body, 2... Valve stem, 3... First valve body, 5... Second valve body, 12, 13... Valve seat,
21... Means for allowing movement of the second valve body only in the axial direction, 23... Locking portion.

Claims (1)

[Scope of utility model registration request] A valve stem is inserted into the valve body so that it can move forward and backward, and a first valve body is provided at the tip of the valve stem, and a first valve body is provided in the middle.
Screw together the second valve body which is reversed with the second valve body.
The second valve body is provided with means for restraining its rotation and only allowing movement in the axial direction of the valve stem, and the valve body is provided with a locking portion that defines the amount of lift of the second valve body from the valve seat. , a stop valve characterized in that a flow path is formed for each valve body.