JP2002333074A - Shuttle valve and shuttle valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shuttle valve and a shuttle valve device capable of simplifying a communication passage and improving the mounting and assembling workability in a case when plural shuttle valves are used. SOLUTION: First and second input ports 4, 5 and an output port 3 are arranged along the moving axial direction of a poppet 20 by this order, the poppet 20 is provided with a cylindrical part sliding in a valve element sliding hole 200a formed on a casing body 200 in a close contact state, and first and second valve seat parts 22, 23 mounted on both sides of the cylindrical part, an axial communication hole 24 is penetrated through the poppet, a plug 10 provided with a third valve seat part 12 for sitting the first valve seat part 22 is fitted to one end of the sliding hole 200a, the other end of the sliding hole 200a is provided with a fourth valve seat part 13 for sitting the second valve seat part 23, the first input port 4 is positioned at an outer peripheral side of the first and third valve seat parts, and the second input port 5 is positioned at an outer peripheral side of the second and fourth valve seat parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shuttle valve provided in a hydraulic circuit of a construction machine or the like for selecting and detecting a pressure of a high-pressure side working fluid from two working fluid pressures, and a plurality of the shuttle valves. The invention relates to a connected shuttle valve device.

[0002]

2. Description of the Related Art In a hydraulic circuit of a construction machine or the like, a shuttle valve for selecting and detecting a high pressure side of two working fluid pressures is used. In a circuit that selects and detects the maximum pressure of three or more signal pressures, such as a positive pump control hydraulic circuit that detects the maximum pilot pressure of the directional control valve, two or more shuttle valves are connected in multiple stages. Shuttle valve devices are widely used.

Conventionally, this type of shuttle valve device includes:
For example, there is the following.

[0004] A first input port, an output port, and a second input port are formed in this order along the moving axis direction of a moving valve body (poppet valve type) of the shuttle valve. An oil hole that connects the output port of the front-stage shuttle valve and the first input port of the rear-stage shuttle valve is provided in a staggered manner in a direction substantially perpendicular to the body movement axis.

The moving valve element of the shuttle valve described in Japanese Utility Model Laid-Open Publication No. 57-25203 is a ball (ball).

[0006] The moving valve element is a ball, and the arrangement of each port with respect to the moving axis is the same as that of Japanese Utility Model Laid-Open No. 57-25203. In the case of a plurality of connections, the front-stage output port and the rear-stage first input port are connected by an oil hole formed linearly in a direction perpendicular to the moving axis of the valve element. For that purpose, a communication groove is provided on the outer peripheral surface of the shuttle valve body along the moving axis direction,
The inlet and the outlet of the first input port on the downstream side are connected in a staggered manner in the shuttle valve body.

Japanese Patent Laid-Open Publication No. Hei 9-303586 A first input port and an output port are provided in the moving axis direction of the moving valve body, and a second input port is provided between these ports in a direction substantially perpendicular to the moving shaft. One of these input ports is connected to the output port as the valve moves. An oil hole that connects the first input port and the output port when the first input port is connected to the output port is provided in the moving valve body.

[0008]

However, the above prior art has the following problems.

In the prior arts, since the output port is provided between the first input port and the second input port provided along the moving axis direction of the moving valve body, the shuttle valve is provided in a plurality of stages. In the case of connection, the connection passage between the front-stage output port and the rear-stage first input port is complicated, and the valve device is easily increased in size. Particularly, in the prior art, the connecting passage is straightened and simplified, but in the end, the inlet and the outlet of the first input port must be connected in a staggered manner within the shuttle valve body, and the passage configuration becomes complicated. . Furthermore, in the prior art, since the entrance side of the first input port is constituted by the outer peripheral communication groove of the shuttle valve body, the passage area is not sufficient, pressure loss occurs, and the responsiveness of signal pressure detection decreases. Further, there is a possibility that the working fluid leaks from the fitting gap between the shuttle valve main body and the casing main body to the low pressure side.

In the prior art, the first input port, the second input port, and the output port are arranged in the moving axis direction of the moving valve body in this order, thereby simplifying the connection passage. However, in this prior art, since the moving valve body needs to be mounted in the casing body so that the first input port and the output port can be communicated via the oil hole, the moving valve body that performs appropriate oil hole connection. There is a problem that the mounting direction tends to cause mounting failure during assembly.

An object of the present invention is to provide a shuttle valve and a shuttle valve device which can simplify a communication passage when a plurality of shuttle valves are used, and can improve mounting and assembling properties.

[0012]

(1) In order to achieve the above object, the present invention provides first and second two input ports, one output port, and the first and second input ports. A shuttle valve comprising a movable valve body for communicating and shutting off between the first and second input ports and the output port along a moving axis direction of the movable valve body.
The movable valve element is arranged in the order of an input port, a second input port, and an output port, and the movable valve element has a cylindrical part that slides closely in a valve element sliding hole provided on the fixed body side, and both sides of the cylindrical part. And a first and second valve seats provided in the movable valve body, and an axial communication hole smaller than the diameter of the cylindrical portion and smaller than the diameter of the first and second valve seats penetrates through the movable valve body. The fixed body side has third and fourth valve seats on which the first and second valve seats of the movable valve body are respectively seated, and the first input port is provided with the first and third valves. The first and third valve seats are located on the outer peripheral side of the seat and can communicate with the output port through the axial communication hole by opening and closing the first and third valve seats. The second input port is connected to the second and fourth valve seats. Located on the outer peripheral side of the portion
And it can be made to be able to communicate with the output port by opening and closing the fourth valve seat.

By arranging the first and second input ports and the output port in the order of the first input port, the second input port, and the output port along the moving axis direction of the movable valve body, the shuttle valve can be operated. Also in the case of using a plurality of shuttle valves, the communication connection between the output port of the front-stage shuttle valve and the first input port of the rear-stage shuttle valve becomes easy, and the communication passage can be simplified.
In addition, since the ports can be connected and connected by oil holes on the same shaft, processing can be simplified and the size of the shuttle valve can be reduced, and a sufficient passage area can be secured, resulting in low pressure loss and high response. Signal pressure detection can be performed.

Further, the movable valve body having the valve seats on both sides and having the communication hole formed therethrough can be made symmetrical, so that it can be inserted into the sliding hole regardless of the mounting direction.・ Assemblability can be improved.

Further, since a seal member can be mounted at an appropriate position between each passage and each port of the shuttle valve, it is possible to provide a shuttle valve capable of preventing leakage of a pressurized fluid.

(2) In the above (1), preferably,
The fixed main body side has a plug located on the first input port side and provided with the third valve seat, and an axial inlet passage is provided on the side of the plug opposite to the third valve seat, A radial outlet passage that connects the inlet passage to the first input port is provided on the third valve seat side.

Thus, the working fluid can be guided to the first input port located on the outer peripheral side of the first and third valve seats through the inlet passage and the outlet passage of the plug.

(3) In the above (1), preferably, the first and second valve seats of the movable valve body are convex.
The third and fourth valve seats on the fixed body side are concave.
The first valve seat and the third valve seat and the second valve seat and the fourth
The valve seat is configured as an outer seat that forms a seat outside the opening of the axial communication hole.

(4) Further, in the above (1), preferably, the first valve seat of the movable valve body has a concave shape, and the third valve seat on the fixed body side has a convex shape. The first valve seat and the third valve seat are configured as an inscribed seat that forms a seat at the opening of the axial communication hole, and the second valve seat of the movable valve body has a convex shape, and the fixed body The fourth valve seat on the side is concave, and the second valve seat and the fourth valve seat are configured as an outer seat that forms a seat outside the opening of the axial communication hole.

(5) In the above (1), preferably, the first and second valve seats of the movable valve body are concave.
The third and fourth valve seats on the fixed body side have a convex shape,
The first and second valve seats and the third and fourth valve seats are both configured as inscribed sheets that form a seat at the opening of the axial communication hole.

(6) In order to achieve the above object,
The present invention relates to a shuttle valve device in which a plurality of shuttle valves (1) to (5) are connected, wherein an output port of a preceding shuttle valve is connected to a first input port of a subsequent shuttle valve, and The moving axis of the moving valve body of the shuttle valve and the moving axis of the moving valve body of the subsequent shuttle valve are arranged on the same axis.

Thus, the shuttle valve device can select and detect the maximum pressure of three or more working fluids. Also,
As described in the above (1), the communication passage when a plurality of shuttle valves are used can be simplified, and the mounting and assembling properties can be improved.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a shuttle valve and a shuttle valve device according to a first embodiment of the present invention.

In FIG. 1, reference numeral 120 denotes a unit shuttle valve constituting a shuttle valve device (hereinafter simply referred to as a shuttle valve).
The shuttle valve 120 has a valve body sliding hole (hereinafter simply referred to as a sliding hole) 20 formed in the casing body 200.
0a, and a poppet 20 which is a moving valve body fitted in the sliding hole 200a so as to be able to slide closely. The poppet 20 has a cylindrical portion 21 that is a sliding portion, and at both ends thereof, convex valve seat portions 22 and 23 having a diameter smaller than the diameter of the cylindrical portion 21.
Is provided. A sliding hole 200 having a diameter larger than the diameter of the sliding hole 200a is provided on the left end surface of the casing body 200 in the drawing.
A plug 200 is formed, and a plug 10 is fitted in the hole 200b. Another casing body 100 is adjacently connected to the plug 200 so as to press an end of the plug 10. In the other casing body 100, the first introduction path 1 is arranged on the same axis as the movement axis of the poppet 20.

The plug 10 has a base 1 which fits into the hole 200b.
0a and a protruding portion 10b that enters the sliding hole 200a. An axial entrance passage 11a is formed in the base portion 10a to be connected to the first introduction passage 1, and the entrance passage 1a is formed in the protruding portion 10b.
A radial outlet passage 11b is formed, which communicates 1a with the first input port 4 in the sliding hole 200a. At the end of the protruding portion 10b of the plug 10, a valve seat 12 having a concave seat surface on which the convex valve seat 22 of the poppet 20 is seated is provided. The first input port 4 is formed on the outer peripheral side of each of the first and second ports 12 and 22. Seal members (O-rings) 15a and 15b are attached to the base end surface and the base outer peripheral surface of the plug 10 to prevent leakage of the working fluid from the joint between the casing 100 and the casing 200.

On the side of the casing body 200 opposite the plug from the sliding hole 200a, the valve seat 13 is formed of a concave seat surface having a smaller diameter than the diameter of the sliding hole 200a and on which the convex valve seat 23 of the poppet 20 is seated. And an output port 3 which is opened on the right end face of the casing body 200 in the drawing, and is formed in the sliding hole 200a on the outer peripheral side of the valve seats 13 and 23 upstream of the output port 3 and the valve seat 13. The second input port 5 is formed, and the second introduction path 2 formed in a direction substantially perpendicular to the central axis of the sliding hole 200a (the movement axis of the poppet 20) is connected to the second input port 5.

Further, an axial communication hole 24 having a diameter smaller than the diameter of the cylindrical portion 21 and smaller than the diameters of the valve seats 22 and 23 is formed in the poppet 20 so as to open to the end faces at both ends of the valve seat.

Therefore, along the movement axis of the poppet 20, the first input port 4 connected to the first introduction path 1 and the second input port 4
A second input port 5 connected to the introduction path 2 and an output port 3 that is communicated with and shut off through the second input port 5 and the valve seat 201 are formed in this order, so that the poppet 20 is sandwiched therebetween. The first input port 4 is disposed on the left side in the drawing, the second input port 5 is disposed on the right side in the drawing, and the output port 3 is disposed downstream of the second input port 5. In addition, the valve seat 12,
The valve seat 22 and the valve seats 13 and 23 are both configured as outer seats that form a seat outside the opening of the axial communication hole 24 of the poppet 20.

In FIG. 1, the shuttle valve device according to the present embodiment is configured by connecting a plurality of shuttle valves similar to the shuttle valve 200, and is provided on the casing body 300 at a stage subsequent to the shuttle valve 200. Shuttle valve 121
Is connected. The shuttle valve 121 is the shuttle valve 12
0, the movement axis of the poppet 20 of the front shuttle valve 120 and the poppet 2 of the rear shuttle valve 121.
The 0 movement axis is arranged on the same axis. In addition, the output port 3 of the shuttle valve 120 functions as a first introduction path for the shuttle valve 121, and
0 output port 3 is the plug 1 of the shuttle valve 121 in the subsequent stage.
0 is connected to the first input port 4 via the passages 11a and 11b.

First, the operation of the shuttle valve 120 will be described.

The first introduction path 1, the passage 11a of the plug 10,
When the working fluid of pressure P1 is led to the first input port 4 via the first input port 4 and the working fluid of pressure P2 is guided to the second input port 5 via the second introduction path 2, the pressure of each working fluid is assumed to be P1> P2 In this case, the poppet 20 moves rightward in the figure due to the received pressure, and the seat portion 23 of the poppet 20 comes into close contact with the valve seat 201 (the state shown in the figure). Therefore, the second input port 5 is cut off from the output port 3 and the first input port 4 is connected to the poppet 20.
The communication port 24 is connected to the output port 3 through a communication hole 24 in the inside. Therefore, the pressure P1 of the first input port 4 is guided to the output port 3 as the detection pressure Pmax.

If the pressure of each working fluid is P1 <P2
In this case, the poppet 20 moves leftward in the figure due to the received pressure, and the seat portion 22 of the poppet 20 comes into close contact with the valve seat portion 12 of the plug 10. Therefore, the first input port 4 is cut off from the output port 3 and the second
The input port 5 is connected to the output port 3 in communication. Therefore, the pressure P2 of the second input port 5 is guided to the output port 3 as the detection pressure Pmax. At this time, poppet 2
0, the pressure P2 of the second input port 5
Is introduced, but the valve seat portion 1 of the seat portion 22 of the poppet 20 is
Due to the close contact with the second port 2, there is no leakage to the first input port 4 on the low pressure side.

The shuttle valve 120 is connected to the shuttle valve 12.
In the shuttle valve device in which 1, 2,... Are combined, the output port 3 of the shuttle valve 120 functions as a first introduction path for the shuttle valve 121, so that the shuttle valve 12
1 operates similarly to the shuttle valve 120. As a result, the shuttle valve device can select and detect the maximum pressure of three or more working fluids.

According to the present embodiment configured as described above, the shuttle valve 120 has the output port 3 disposed downstream of the two input ports 2 and 4 formed along the movement axis of the poppet 20. Therefore, a plurality of shuttle valves 12
Even when the shuttle valve device is constructed using 0, 121,..., The communication connection between the front-stage output port 3 and the rear-stage first input port 4 is easy, and the front-stage output port 3 and the rear-stage first input port are easily connected. The communication connection with the port 4 is easy, the communication passage can be simplified, and the size can be reduced. Also, the sliding hole 200a on the same axis and the axial communication hole 2 in the poppet 20
4. Since the ports can be connected and connected by the passages 11a and 11b in the plug 10, the processing of the casing body 200 can be simplified, and there is no need to form a restricted passage such as an outer peripheral groove. The pressure fluid on the high pressure side of the first input port 4 and the second input port 5 can be guided to the output port 3 while ensuring a sufficient passage area, thereby reducing the pressure loss and increasing the responsiveness of signal pressure detection. Can be realized.

Further, according to the present embodiment, the poppet 20, which is a moving valve body, is symmetrical and can be inserted into the sliding hole 200a regardless of the mounting direction, so that there is no mounting error and assembly is possible. The performance is improved.

Further, a sealing member (O
By mounting the (rings) 15a and 15b, leakage of the working fluid from the joint between the casing 100 and the casing 200 can be prevented.

FIG. 2 is a cross-sectional view of a shuttle valve and a shuttle valve device according to a second embodiment of the present invention. In the figure, components equivalent to those shown in FIG. ing.

In FIG. 2, a shuttle valve 120A according to the present embodiment has a poppet 50 which is a movable valve body which is slidably fitted in a sliding hole 200a, and the poppet 40 is a sliding portion. And the valve seats 4 at both ends
2 and 43, and an axial communication hole 44 is formed in the poppet 40 so as to open to the end faces at both ends of the valve seat. An axial inlet passage 31a and a radial outlet passage 31b are formed in the base 30a and the protrusion 30b of the plug 30, and the valve seat 4 of the poppet 40 is formed at the end of the protrusion 30b.
A valve seat portion 32 on which the seat 2 is seated is provided. A valve seat 33 on which the valve seat 43 of the poppet 40 is seated is formed on the side opposite to the plug of the sliding hole 200a of the casing body 200.

In this embodiment, the shape of the valve seats 42, 43 at both ends of the poppet 40 is different from that of the first embodiment, and the valve seats 42, 43 are chamfered at their outer peripheral edges. The valve seat 32 has a tapered seat surface, and the valve seat 32 on the plug 30 and the valve seat 33 on the non-plug side correspond to the convex seat valve of the poppet 40. It is a concave valve seat that sits on the seats 42 and 43.

The shuttle valve 121A is also a shuttle valve 120A.
It has the same structure as.

According to this embodiment, the same effects as those of the first embodiment shown in FIG. 1 can be obtained.

FIG. 3 is a cross-sectional view of a shuttle valve and a shuttle valve device according to a third embodiment of the present invention. In the figure, components equivalent to those shown in FIG. ing.

In FIG. 3, a shuttle valve 120B according to the present embodiment has a poppet 60 which is a movable valve body which is slidably fitted in a slide hole 200a. And the valve seats 6 at both ends thereof
2 and 63, and an axial communication hole 64 is formed in the poppet 60 so as to open to the end faces at both ends of the valve seat. An axial inlet passage 51a and a radial outlet passage 51b are formed in the base 50a and the protrusion 50b of the plug 50, and the valve seat 6 of the poppet 60 is formed at the end of the protrusion 50b.
A valve seat portion 52 on which the seat 2 is seated is provided. A valve seat 53 on which the valve seat 63 of the poppet 60 is seated is formed on the side opposite to the plug of the sliding hole 200a of the casing body 200.

Also in this embodiment, the shape of the valve seats 62 and 63 at both ends of the poppet 60 is different from that of the first embodiment, and the valve seat 62 on the first input port 4 side is
The valve seat 52 on the plug 50 side, which is the valve seat, is seated with the concave valve seat 62 of the poppet 60. This is a valve seat portion having a convex seat surface. Also, the valve seat 63 on the second input port 5 side is similar to the second embodiment,
A convex valve seat portion having a tapered seat surface with a chamfered outer peripheral edge portion, and a valve seat portion 53 on the opposite side of the plug, which is a valve seat portion, is a recess seated on the seat surface valve seat portion 53. The valve seat is shaped. That is, the valve seats 52 and 62 on the first input port 4 side are configured as inscribed sheets that form a seat at the opening of the axial communication hole 24 of the poppet 20,
The valve seats 53 and 63 on the input port 5 side are provided with the axial communication holes 24.
Is formed as an outer seat that forms a seating portion outside the opening.

The outer shape of the valve seat 62 on the first input port 4 side of the poppet 60 has the same shape as the valve seat 63 on the second input port 5 side, and the poppet 60 is symmetrical. As a result, the poppet 60 can slide in the sliding hole 200 regardless of the mounting direction.
a.

The shuttle valve 121B is also a shuttle valve 120B.
It has the same structure as.

According to this embodiment, the same effects as those of the first embodiment shown in FIG. 1 can be obtained.

FIG. 4 is a sectional view of a shuttle valve and a shuttle valve device according to a fourth embodiment of the present invention. In the figure, the same reference numerals are used for the same members as those shown in FIGS. Is attached.

In FIG. 4, a shuttle valve 120C according to the present embodiment has a poppet 80 which is a movable valve body which is slidably fitted in a slide hole 200a. Cylindrical portion 81 and valve seat portions 8 at both ends thereof
2 and 83, and an axial communication hole 84 is formed in the poppet 80 so as to open to the end surfaces at both ends of the valve seat. An axial inlet passage 51a and a radial outlet passage 51b are formed in the base 50a and the protrusion 50b of the plug 50, and the valve seat 8 of the poppet 80 is formed at the end of the protrusion 50b.
A valve seat portion 52 on which the seat 2 is seated is provided. Sliding hole 20
A protruding portion 70c of the intermediate plug 70 toward the front stage is located on the side opposite to the plug 0a, and a valve seat portion 73 on which the valve seat portion 83 of the poppet 80 is seated is formed at the tip of the protruding portion 70c.

The intermediate plug 70 has a shape in which a protruding portion 70c is added to the plug 50 fitted on the first input port 4 side, and the base 71a of the intermediate plug 70 is connected to the casing body 300 of the downstream shuttle valve 121C. Hole 30 formed
0b. An axial entrance passage 71a that opens at the end face of the projection 70c is formed in the projection 70c and the base 70a on the side of the shuttle valve 120C.
A radial outlet passage 71b is formed in the C-side projection 71b. The axial inlet passage 71a is the shuttle valve 12
Functions as an output port of OC.

The valve seats 82 at both ends of the poppet 80,
The shape of 83 is different from that of the first embodiment. The valve seats 82 and 83 are concave valve seats formed by the opening edges of the axial communication holes 84 of the poppet 80, and the valve seats thereof are provided. Valve seat 52 on the plug 50 side and the plug projection 70c
The side valve seat 73 is a concave valve seat 82 of the poppet 80,
Reference numeral 83 denotes a valve seat portion having a convex seat surface to be seated. That is, the valve seats 52 and 82 on the first input port 4 side and the valve seats 73 and 83 on the second input port 5 side are both inscribed forming a seat at the opening of the axial communication hole 84 of the poppet 80. It is configured as a sheet.

The shuttle valve 121C is also a shuttle valve 120C.
It has the same structure as.

According to this embodiment, the same effects as those of the first embodiment shown in FIG. 1 can be obtained.

FIG. 5 is a sectional view of a shuttle valve device according to a fifth embodiment of the present invention. This embodiment is 1
This is an example of a shuttle valve device configured by connecting a plurality of (two in the illustrated example) shuttle valves to one casing body.
The main part of the unit shuttle valve has the same structure as that of the unit shuttle valve according to the first embodiment shown in FIG. 1, and the same members as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 5, 120D and 121D are 3
A first-stage shuttle valve portion and a second-stage shuttle valve portion for selecting and detecting the highest pressure among the two input pressures P1, P2, and P3. Since these shuttle valve portions 120D and 121D are configured, the casing body 400 has A hole 400a having a bottom is provided. The hole 400a is connected to the plug 500 of the front-stage shuttle unit main body, the plug 600 of the rear-stage shuttle unit main body connected to the end of the plug 500, and the end of the plug 600. The plug 700 is mounted.

A sliding hole 500a having a bottom is formed in the front-stage shuttle part main body plug 500.
The communication hole 2 which is a moving valve body of the first-stage shuttle section 120D
The poppet 20-1 having the number 4 is closely fitted and slidably fitted. Further, a valve seat 503 to which the valve seat portion 22 of the poppet 20-1 can be in close contact is formed at the bottom of the sliding hole 500a, and a rear-stage shuttle portion main body plug is provided on the valve seat 23 side of the poppet 20-1. 600 screw fastening parts are located,
A valve seat 601 to which the valve seat 23 can be in close contact is formed at the tip of the screw fastening portion, and the plug 600 has a valve seat 601.
An output port 602 that opens to the outside is formed.

A sliding hole 600a having a bottom is formed in the rear shuttle part main body plug 600, and
Poppet 20 having a communication hole 24 which is a moving valve body of D
2 is fitted and slidably fitted. In addition, sliding hole 6
00a, a valve seat 608 to which the valve seat portion 22 of the poppet 20-2 can be in close contact is formed.
The screw fastening portion of the plug 700 is located on the valve seat portion 0-2 side, and a valve seat portion 701 to which the valve seat portion 23 can be in close contact is formed at the tip of the screw fastening portion. An output port 702 opening to the portion 701 is formed.

Therefore, the plug 500 and the poppet 20
Front section 120D consisting of -1 and plug 600
Inside the first input port 50 connected to the passage 401 via the passage 501 along the movement axis of the poppet 20-1.
4, a second input port 505 connected to the passage 402 via the passage 502, and the second input port 505 and the valve seat 2
The output port 602 of the preceding stage, which is communicated / blocked via the third and the third 601, is formed in this order.
-1 so that the first input port 504 is on the left side in the figure.
However, a second input port 505 is disposed on the right side in the figure, and an output port 602 is disposed downstream thereof.

Further, inside the rear stage shuttle portion 121D composed of the plug 600, the poppet 20-2, and the plug 700, along the movement axis of the poppet 20-2, which is coaxial with the movement axis of the poppet 20-1, From passage 604 to passage 603
, A second input port 607 connected to the passage 403 via the passage 605, a second input port 607 connected to the passage 403 via the passage 605, and the second input port 607 and the valve seats 23, 701. The output port 702 of the subsequent stage, which is communicated / blocked through the port, is formed in this order, and the first input port 606 of the latter stage is located on the left side in the drawing so as to sandwich the poppet 20-2. The second stage on the side
An input port 607 is arranged, and an output port 702 is arranged downstream thereof.

Further, in order to prevent leakage of the pressurized fluid, seal members (O-rings) are provided at appropriate positions between passages and between ports.
Is installed.

Therefore, in this embodiment, as in the case of the first embodiment shown in FIG.
-1 of the first input port 504 in accordance with the
One of the high pressure side of the second input port 505 and the second input port 505 is selectively connected to the output port 602 of the preceding stage, and the latter is connected to the output port 602 of the preceding stage as the valve body of the subsequent poppet 20-2 moves. Of the first input port 606 and the second input port 607 at the subsequent stage are selectively connected to the latter output port 702 connected to the passage 404 via the passage 405.

That is, the highest-pressure working fluid among the working fluids input to the passages 401, 402, and 403 is transferred to the passage 4.
04 can be selectively detected.

In this embodiment, the shuttle valve device has two unit shuttle valves each having a front and a rear stage. However, a plurality of unit shuttle valves can be additionally arranged on the same shaft at the rear stage. The detection of the selection of the working fluid on the high pressure side as described above is repeated at each unit shuttle valve,
The highest pressure working fluid can be led to the last output port.

Also in this embodiment, since a plurality of unit shuttle valves can be connected on the same linear axis (the moving axis of the moving valve body of the unit shuttle valve), the signal path is simplified and the shuttle valve device can be downsized. And poppets 20-1 and 20-2.
Since 0-2 has a symmetrical shape, it can be inserted into the sliding hole regardless of the mounting direction, and the mounting / assembling property can be improved, and the same effects as those of the first embodiment can be achieved. can get.

FIG. 6 shows a modification of the moving valve body of the shuttle valve. As shown in FIG. 6, a seal member 25 may be attached to a cylindrical surface 21 of a sliding portion of a poppet 20 which is a moving valve body constituting the shuttle valve of the present invention. Leakage can be prevented with respect to micro leakage between both input ports via the annular gap.

[0067]

According to the present invention, the first input port, the second input port, and the output port are arranged in this order along the moving axis direction of the moving valve body. In addition, communication connection between the output port of the front-stage shuttle valve and the first input port of the rear-stage shuttle valve is facilitated, and the communication passage can be simplified. In addition, since the ports can be connected and connected by oil holes on the same shaft, processing can be simplified and the size of the shuttle valve can be reduced, and a sufficient passage area can be secured, resulting in low pressure loss and high response. Signal pressure detection can be performed.

Further, since the movable valve body having the valve seats on both sides and having the communication hole formed therethrough can be made bilaterally symmetrical, it can be inserted into the sliding hole regardless of the mounting direction.・ Assemblability can be improved.

Further, since a seal member can be mounted at an appropriate position between passages and ports of the shuttle valve, a shuttle valve capable of preventing leakage of a pressurized fluid can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shuttle valve and a shuttle valve device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a shuttle valve and a shuttle valve device according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a shuttle valve and a shuttle valve device according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a shuttle valve and a shuttle valve device according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a shuttle valve device according to a fifth embodiment of the present invention.

FIG. 6 is a view showing a modified example of the moving valve body of the shuttle valve of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st introduction path 2 2nd introduction path 3 output port 4 1st input port 5 2nd input port 10 plug 10a base 10b protrusion 11 passage 11a inlet passage 11b outlet passage 15a, 15b sealing member 12 valve seat 20 poppet ( (Moving valve body) 21 cylindrical portion 22 valve seat portion 23 valve seat portion 24 communication hole 25 sealing member 30 plug 31 passage 32 seat portion 40 poppet (moving valve body) 41 cylindrical portion 42 seat portion 43 seat portion 44 communication hole 50 plug 50a Base 50b Projecting part 52 Seat part 60 Poppet (moving valve body) 61 Cylindrical part 62 Seat part 63 Seat part 64 Communication hole 70 Plug 71 Passage 72 Seat part 73 Seat part 100 Casing body 120 Shuttle valve (unit shuttle valve) 121 Shuttle valve (Unit shuttle valve) 200 Casing body 200a Sliding hole 201 Valve seat 300 Casing body 400 Casing body 400a Hole 401 Input line 402 Input line 403 Input line 404 Output line 405 Passage 500 Plug 500a Hole 501 Passage 502 Passage 503 Valve seat 504 First input port 505 Second input port 600 Plug 600a Hole 601 Valve seat 602 Output port 603 Passage 604 Passage 605 Passage 606 First input port 607 Second input port 608 Valve seat 700 Plug 701 Valve seat 702 Output port

Claims (6)

[Claims] 1. A shuttle valve comprising a first input port and a second input port, an output port, and a movable valve body that connects and disconnects the first input port and the output port. In the above, the first and second input ports and the output port are arranged in the order of a first input port, a second input port, and an output port along a moving axis direction of the moving valve body. A cylindrical portion that slides in close contact with a valve body sliding hole provided on the fixed body side, and first and second valve seats provided on both sides of the cylindrical portion; An axial communication hole smaller than the diameter of the cylindrical portion and smaller than the diameter of the first and second valve seats is formed therethrough. The first and second valve seats of the movable valve body are formed on the fixed body side, respectively. Third and fourth valve seat portions to be seated;
The input port is located on the outer peripheral side of the first and third valve seats, and can communicate with the output port via the axial communication hole by opening and closing the first and third valve seats. A shuttle valve, wherein a port is located on an outer peripheral side of the second and fourth valve seats and is communicable with the output port by opening and closing the second and fourth valve seats. 2. The shuttle valve according to claim 1, wherein the fixed main body side is located on the first input port side and the third main body side is connected to the third input port side.
A plug provided with a valve seat portion, an axial inlet passage provided in the plug on a side opposite to the third valve seat portion, and the inlet passage communicating with the first input port on a third valve seat side; A shuttle valve, wherein a radial outlet passage is provided. 3. The shuttle valve according to claim 1, wherein the first and second valve seats of the movable valve body are convex, and the third and fourth valve seats on the fixed body side are concave. The first valve seat and the third valve seat, and the second valve seat and the fourth valve seat are configured as outer seats that form a seat outside the opening of the axial communication hole. A shuttle valve, characterized in that: 4. The shuttle valve according to claim 1, wherein the first valve seat of the movable valve element has a concave shape, and the third valve seat on the fixed body side has a convex shape. The portion and the third valve seat are configured as an inscribed seat that forms a seat at the opening of the axial communication hole, and the second valve seat of the movable valve body has a convex shape, and the third valve seat on the fixed body side. The fourth valve seat has a concave shape, and the second valve seat and the fourth valve seat are configured as outer seats forming a seat outside the opening of the axial communication hole. Shuttle valve to do. 5. The shuttle valve according to claim 1, wherein the first and second valve seats of the movable valve body are concave, and the third and fourth valve seats on the fixed body side are convex. A shuttle valve, wherein the first and second valve seats and the third and fourth valve seats are both formed as inscribed seats forming a seat at an opening of the axial communication hole. . 6. A shuttle valve device comprising a plurality of shuttle valves according to any one of claims 1 to 5, wherein an output port of a preceding shuttle valve is connected to a first input port of a subsequent shuttle valve. And a moving axis of a moving valve body of a preceding shuttle valve and a moving axis of a moving valve body of a subsequent shuttle valve are arranged on the same axis.