JPS6352241B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is provided in a circuit of a fluid actuator used in a feeding device for a movable member such as a slide table in a machine tool, and is capable of controlling the feed speed of a movable member in the machine tool. The present invention relates to a flow rate regulating valve with a shut-off valve that can adjust the flow rate to high, medium, or low speeds.

[Prior art]

Conventionally, this type of flow regulating valve with a shut-off valve has first and second ports 1a, 1b through which fluid flows in and out, and a parallel port connecting these two ports 1a, 1b, as shown in FIG. The first and second communication passages P1, P2 and the second communication passage P2 are branched from an intermediate portion thereof, and are connected to the first port 1a, with a portion forming a part of the first communication passage P1 (second port side portion). A valve body 1 having a bypass passage P3 arranged coaxially (overlapping with the first port side portion of the first communication passage P1), a valve body 1 assembled to this valve body 1 and provided on a movable part such as a slide table. When the mechanical operation received from the cam plate 2 is performed in the first stage (moved down to the position of the stepped portion 2a of the cam plate 2), the first communication passage P1 is closed and the bypass passage P is closed.
3 is in the open state and when the second stage operation is performed (moved down to the position of the lower end 2b of the cam plate 2), the first communication passage P1 and the bypass passage P3 are closed, and when the mechanical operation is released, the spring force closes the first communication passage P1 and the bypass passage P3. After returning to the original position, the first communication passage P1 and the bypass passage P3
A shut-off valve 3 is opened, a first throttle valve 4 is installed between the second port 1b of the second communication passage P2 in the valve body 1 and the bypass passage P3, and regulates the flow rate; A second throttle valve 5 is provided between the bypass passage P3 of the two-way passage P2 and the first port 1a to regulate the flow rate, and the second throttle valve 5 regulates the flow rate of the fluid flowing from the second port 1b to the first port 1a. 1 with free flow or first throttle valve 4
The fluid flow rate can be adjusted as a stage throttle flow or a two stage throttle flow using both throttle valves 4 and 5. In addition, the reference numeral 6 in the figure is a pressure compensation valve that controls the fluid pressure supplied to the first throttle valve 4, and the reference numeral 7 is a check valve that allows free flow from the first port 1a to the second port 1b. be.

[Problem that the invention seeks to solve]

In the above-described conventional flow rate regulating valve with a shut-off valve, the shut-off valve 3 has a single valve spool 3a, a return spring 3b, and a roller 3c.
Although it has a simple structure, when the first stage is operated, the land 3a1 of the valve spool 3a opens the first communication path P1.
is closed (at this time, the bypass passage P3 is not closed by the land 3a2), and when the second stage operation is performed, the land 3 of the valve spool 3a
The first communication passage P1 is closed by a1, and the bypass passage P3 is closed by land 3a2.

Therefore, each land 3a of the valve spool 3a
1, 3a2, each land 3a1,
3a2 and the inner hole of the valve body 1 into which they fit, an annular gap is inevitably formed between the lands 3a1 and 3a2.
Even if the passages P1 and P3 are closed, each throttle valve 4 and 5 is
Fluid leaks and flows by bypassing the Therefore, the flow rate of the fluid flowing from the second port 1b toward the first port 1a is not accurately adjusted by each throttle valve 4, 5, and the feed rate of the movable member in the machine tool is not accurately controlled. Note that the amount of fluid leakage described above will increase if the fluid flowing into the second port 1b has a high pressure and a large flow rate. The flow rate that leaks is larger than the flow rate that leaks through the land 3a2 that shuts off the fluid whose flow rate is adjusted by the first throttle valve 4 (low pressure fluid).

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems, and in the above-described flow rate regulating valve with a shut-off valve, the shut-off valve is disposed in a part of the first communication passage and is moved in the axial direction. A poppet that opens and closes the first communication passage by seating on and separating from a valve seat provided in the first communication passage, and a return spring that engages one end of the poppet and biases the poppet in the direction of opening. a valve spool that is interposed in a portion of the bypass passage and is arranged coaxially with the poppet and opens and closes the bypass passage by moving in the axial direction; a valve spool that is retractable between the valve spool and the poppet; a connecting spring which is interposed to elastically connect the valve spool and the poppet; and a connecting spring which is fitted into the valve body so as to be retractable in the axial direction and is disposed coaxially with the valve spool and the poppet for the mechanical operation. The valve spool and the connecting spring are pushed into the valve body when the poppet is seated on the valve seat to close the first communication passage and the valve spool does not close the bypass passage. ,
The poppet is pushed against the spring force of the return spring, and when the poppet is operated in two steps by the mechanical operation, it is pushed further into the valve body than when the poppet is operated in the first step, and the valve spool is pushed into the bypass passage. The valve spool is characterized in that it is configured by a plunger that further pushes the valve spool against the spring force of the connection spring until the valve spool is closed.

[Action of the invention]

In the flow regulating valve with a shut-off valve according to the present invention, if the mechanical operation of the shut-off valve is released, the poppet, connection spring, valve spool, and plunger are returned to their original positions by the spring force of the return spring. Therefore, both the first communication passage and the bypass passage are open.
Therefore, at this time, the fluid flowing from the second port to the first port mainly flows freely through the first communication path (the second communication path is provided with a throttle valve and has a large flow resistance, making it difficult to flow). flows.

Furthermore, when the shutoff valve is mechanically operated to the first stage, the poppet, connection spring, valve spool, and plunger are pushed against the spring force of the return spring, and the poppet is seated on the valve seat and the first valve is closed. Securely close the passage without any gaps. However, at this time, since the valve spool does not close the bypass passage, the fluid flowing from the second port to the first port flows mainly through the second communicating passage where the first throttle valve is interposed, and mainly through the bypass passage (the second throttle valve (The second communication passage, which is interposed therein, has a second throttle valve, so the flow resistance is large and it is difficult to flow). be done.

Furthermore, when the shutoff valve is mechanically operated in two steps, the plunger and the valve spool are further pushed against the spring force of the connection spring.
A valve spool closes the bypass passage. However, at this time, the first communication passage remains reliably closed without any gaps due to the seating of the poppet on the valve seat, so the fluid flowing from the second port to the first port is not allowed to flow through the interposition of the first throttle valve. The fluid flows through a certain second communication passage and a second communication passage in which a second throttle valve is interposed in a two-stage throttle flow using both throttle valves, and the flow rate is adjusted by both throttle valves.

〔Effect of the invention〕

In the flow regulating valve with a shut-off valve according to the present invention, a poppet (which closes the first communicating passage reliably without a gap when seated on the valve seat) has a better fluid-blocking property than the valve spool as a valve that opens and closes the first communicating passage in the shut-off valve. ), the fluid in the first communicating passage can be shut off better than in the past when the shut-off valve is operated in one or two stages. Therefore, the flow rate of fluid from the second port to the first port is accurately regulated by the first throttle valve or both throttle valves. Furthermore, when the shut-off valve is operated in two stages, the bypass passage is closed by the valve spool, so leakage in the valve spool seems to have an adverse effect on the flow rate adjustment by both throttle valves. Further upstream, the flow rate is adjusted by the first throttle valve, and the pressure on the upstream side of the bypass passage is low, and the differential pressure between the upstream side and the downstream side (before and after the valve spool) in the bypass passage remains small and approximately constant. Therefore, the amount of leakage in the valve spool is always small and approximately constant, and in reality it has almost no adverse effect on the flow rate adjustment by both throttle valves.

Further, in the flow rate regulating valve with a shut-off valve according to the present invention, the bypass passage is opened and closed by the valve spool, so the structure of the shut-off valve is not made unnecessarily complicated. That is, when the bypass passage is configured to be opened and closed using a poppet instead of the valve spool of the present invention, even if the poppet of the present invention closes the first communication passage in the first stage operation, the above-described substitute poppet Do not close the bypass passage, and
In order to ensure that the above-mentioned substitute poppet closes the bypass passage by step operation, it is necessary to have a configuration in which the plunger can be pushed in after closing the bypass passage, and the configuration of the shut-off valve is complicated and has a large number of parts. This often results in high costs.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows an example in which the flow rate regulating valve V1 with a shut-off valve according to the present invention is implemented in a feed control device 90 of a machine tool. It consists of a fluid cylinder 93 that reciprocates the slide table 92, a 4-port 3-position electromagnetic switching valve 94 and a flow rate adjustment valve V1 that control the operation of the fluid cylinder 93. The electromagnetic switching valve 94 has solenoids a and b, and each port has a conduit 81 connected to the left chamber 93a of the fluid cylinder 93, and a conduit 8 connected to the first port 11 of the flow rate adjustment valve V1.
2. A conduit 83 connected to a pressure source 95 and a conduit 84 connected to a tank 96 are connected, respectively. Further, a conduit 85 connected to the right chamber 93b of the fluid cylinder 93 is connected to the second port 12 of the flow rate adjustment valve V1.
is connected.

The flow rate adjustment valve V1 consists of a valve body 10, a known pressure compensation valve 20 assembled to the valve body 10, a first variable throttle valve 30, a second variable throttle valve 40, and a novel shut-off valve 50. The fluid flowing from the port 11 toward the second port 12 is defined as a free flow, and the fluid flowing from the second port 12 toward the first port 11 is defined as a free flow or the first variable throttle valve 3
One-stage throttle flow or double throttle valve 30, 40 by 0
The flow rate of the fluid can be adjusted as a two-stage throttle flow. The valve body 10 includes the first port 11 and the second port 12, both ports 11 and 1 described above.
2, a U-shaped main passage 13 that connects the
A pilot passage 14 is connected to the port 11, and a pilot passage 14 is branched from the upper bending part 13a of the main passage 13 and communicates with a part 14a of the pilot passage 14.
1 and 12 separately from the main passage 13 (in other words, provided in parallel to the main passage 13 and the pilot passage 14), and a communication passage 15 that branches off from an intermediate portion 15a of the communication passage 15 and connects the pilot passage 13 to the pilot passage 13. A bypass passage 16 is provided coaxially disposed in and communicating with a portion 14a of the passage 14 to connect the intermediate portion 15a to the first port 11. Pressure compensation valve 2
0 and the first variable throttle valve 30 are connected to the main passage 13 (second port 12) in the communication passage 15 of the valve body 10.
The second variable throttle valve 40 is interposed between the bypass passage 16 in the communication passage 15 and the part 14a (first port 11) of the pilot passage 14. , the flow rate of fluid flowing through the communication path 15 is adjusted by these valves 20, 30, and 40.

The shutoff valve 50 includes a cylindrical poppet 51 that opens and closes the main passage 13, a rod-shaped poppet 52 that opens and closes the pilot passage 14, and a cup-shaped valve spool 53 that opens and closes the bypass passage 16. When the step part 91a mechanically operates the first step, the main passage 1
3 and the pilot passage 14 are closed, and the cam plate 9
When the bypass passage 16 is mechanically operated in two steps by the lower end 91b of the bypass passage 16, the bypass passage 16 is further closed, and when the above-mentioned mechanical operation is released, the bypass passage 16 is returned to the original position shown by the spring force, and at least the pilot passage 14 and the bypass passage 16 are closed. This opens the bypass passage 16. The poppet 51 has a large diameter inner hole 14 of the pilot passage 14 which has a larger diameter than the main passage 13.
b so as to be movable in the vertical direction, and is urged upward by a return spring S1,
It has a valve portion 51a that seats on a valve seat 13c provided in the main passage 13, and a small hole 51b that allows the second port 12 and the pilot passage 14 to communicate at all times. When the fluid does not flow toward the pilot passage 14 through the small hole 51b, the poppet 51 is inserted into the main passage 13 by the spring force of the return spring S1.
When the fluid flows through the small hole 51b toward the pilot passage 14, the main passage 13 is opened by moving downward against the spring force due to the differential pressure generated by the small hole 51b. Also, the poppet 51 is the main passage 1
The first port 11 has an annular pressure receiving surface A that is exposed to the fluid supplied to the first port 11 and receives fluid pressure against the spring force even when the first port 11 is closed.
When pressure fluid is supplied to the pilot passage 1
Under the action of a check valve 54 disposed in port 4, it moves downwardly to open main passage 13 and allow free flow of fluid from first port 11 to second port 12.

The poppet 52 is fitted into a valve case 55 fitted to the valve body 10 so as to be movable in the vertical direction, and is urged upward by a return spring S2 via a retainer R1.
It has a valve portion 52a that is seated on a valve seat 55a provided in the valve seat 55a, and an inverted T-shaped communication hole 52b that forms a part of the pilot passage 14. The upper end of this poppet 52 is fitted into a plug 56 with a hexagonal hole screwed inside the lower end of the valve spool 53, and an annular plug is attached to the lower end of the connecting spring S3 whose upper end is locked to the valve spool 53. They are engaged via retainer R2. This poppet 52 has rollers 59,
The valve body 10 rotatably supports this roller 59.
When moved downward by the cam plate 91 through the plunger 58, valve spool 53, connecting spring S3 and retainer R2, which are assembled so as to be able to come out and go out, the pilot passage 14 is closed, and at other times, the pilot passage 14 is closed by the spring force of the return spring S2. The pilot passage 14 is held in the illustrated position to open the pilot passage 14. In this poppet 52, a through hole 52c is formed in its axis, and the seat diameter and seal diameter of the poppet 52 are approximately the same, so that the poppet 52 is moved by the fluid pressure acting on the poppet 52. It is designed not to be pushed in the axial direction.

The valve spool 53 is fitted into an inner hole of the valve body 10 that serves as the bypass passage 16 and an inner hole having the same diameter as the inner hole so as to be slidable in the vertical direction, and is urged upward together with the poppet 52 and the like by a return spring S2. part 14 of the pilot passage 14.
A valve hole 53a is provided in the peripheral wall, which is always open to the intermediate portion 15a of the communication passage 15 and selectively opens to the intermediate portion 15a of the communication passage 15.
At the upper end of this valve spool 53 is a plunger 5.
8 is in contact with the lower end. This valve spool 5
3 is the lower end 91 of the roller 59 and the cam plate 91.
The bypass passage 16 is closed when the plunger 58 moves downward until the plunger b is engaged, and at other times the bypass passage 16 is kept open by the spring force of the springs S2 and S3. In order to obtain such a function, the spring force (mounting load) of the connection spring S3 is made larger than that of the return spring S2, and the connection spring S3 is designed to prevent the valve portion 52a of the poppet 52 from touching the valve seat 55a of the valve seat 55. Functions as an operating force transmission member until the seat is seated.
After that, it functions as a member that allows the valve spool 53, plunger 58, and roller 59 to move downward.

In this embodiment configured as described above, when the solenoid a of the electromagnetic switching valve 94 is energized from the illustrated state, pressure fluid from the pressure source 95 flows through the conduit 81 and flows into the left chamber 93a of the fluid cylinder 93.
Further, the fluid in the right chamber 93b of the fluid cylinder 93 flows back to the tank 96 via the conduit 85, the valve body 10, and the conduit 82, and the slide table 92 is driven forward to the right. At the beginning of this forward drive, the roller 59 and the cam plate 91 are not engaged, and the poppet 52 opens the pilot passage 14, so the right chamber 9 of the fluid cylinder 93
A part of the fluid that returns to the tank 96 from 3b flows from the main passage 13 to the pilot passage 14 through the small hole 51b of the poppet 51 in the valve body 10, and the remainder of the fluid mainly flows through the small hole 51b of the poppet 51. From the second port 12 to the first port 1 through the main passage 13 that opens due to the flow (the communication passage 15 is provided with throttle valves 30 and 40, and the flow resistance is large, making it difficult to flow).
1 and slide table 92.
is fast-forwarded at high speed.

Thus, the cam plate 91 engages with the roller 59 and the roller 59 engages with the stepped portion 91 of the cam plate 91.
When the plunger 58, spool 53, poppet 52, etc. are moved down integrally against the return spring S2, the valve portion 52a of the poppet 52 is moved down to the valve seat 55a. and the pilot passage 14 is closed. At this time, the bypass passage 16 is not closed. Therefore, fluid no longer flows through the small hole 51b of the poppet 51, and the differential pressure across the small hole 51b disappears, causing the poppet 5
1 is moved upward by return spring S1,
The valve portion 51a is seated on the valve seat 13c and the main passage 1
3 is closed. In this way, the main passage 13
After the valve body 10 is closed, the fluid flowing into the valve body 10 passes through the communication passage 15 interposed with the first variable throttle valve 30 and mainly through the bypass passage 16 (interposed with the second variable throttle valve 40). The communication passage 15 has a large flow resistance due to the presence of the throttle valve 40, making it difficult to flow.) The fluid flows from the second port 12 to the first port 11 in a one-stage throttle flow, and the flow rate is adjusted by the first variable throttle valve 30. The slide table 92
is fed at medium speed and rough-cut by a machine tool.

Next, when the roller 59 is moved down (two-stage operation) to the position of the lower end 91b of the cam plate 91, the plunger 58, spool 53, etc. are moved down against the connection spring S3, and the spool 53 moves through the bypass passage 16. close. At this time, the main passage 13 and the pilot passage 14 remain closed. Therefore, the fluid flowing into the valve body 10 flows from the second port 12 to the first port 11 through the communication passage 15 interposed between the two throttle valves 30 and 40 in a two-stage throttle flow. The flow rate is adjusted by valves 30 and 40. Therefore, the slide table 92
is fed at low speed and finished by a machine tool. This low-speed feeding of the slide table 92 is stopped by demagnetizing the solenoid a.

Furthermore, when the solenoid b of the electromagnetic switching valve 94 is excited, pressure fluid from the pressure source 95 flows into the right chamber 93b of the fluid cylinder 93 via the conduit 82, the valve body 10, and the conduit 85, and the left chamber 93b of the fluid cylinder 93.
The fluid in 3a flows back to tank 96 through conduit 81, and slide table 92 is driven backward to the left. Therefore, during this backward drive, at least the check valve 54 (when the roller 59 and the cam plate 91 are engaged, the poppet 5
2) In order to block the pressure fluid that tries to flow from the first port 11 to the second port 12 through the pilot passage 14 and prevent the pressure fluid from acting on the lower surface of the poppet 51, the poppet 51 has its pressure receiving surface A. is moved downward by the pressing force of the pressure fluid acting on the
Allowing free flow of pressure fluid from the first port 11 to the second port 12. Therefore, the slide table 92 is moved back at high speed. This quick return of the slide table 92 is stopped by demagnetizing the solenoid b, and the slide table 92 returns to the illustrated state.

By the way, in this embodiment, the shutoff valve 50 has poppets 51 and 52 and a valve spool 5.
3. Plunger 58 and springs S1, S2,
S3, the stepped portion 91 of the cam plate 91
When the poppet 51 is mechanically operated in the first step by a, the poppet 51 is seated on the valve seat 13c and the main passage 13 is opened.
The poppet 52 is securely closed without any gaps, and the poppet 52 is tightly closed against the valve seat 5.
5a to securely close the pilot passage 14 without any gaps and provide better fluid shut-off compared to conventional shut-off valves (blocking by a valve spool). The flow rate is precisely regulated by the first variable throttle valve 30. Furthermore, when the lower end 91b of the cam plate 91 is mechanically operated in two steps, the poppet 51 closes the main passage 13, the poppet 52 closes the pilot passage 14, and the valve spool 53 closes the bypass passage 16. The flow rate of fluid from the second port 12 to the first port 11 is precisely regulated by both throttle valves 30, 40 in order to provide better fluid shutoff compared to conventional shut-off valves. At this time, it seems that the leakage in the valve spool 53 adversely affects the flow rate adjustment by both throttle valves 30 and 40, but at this time, the flow rate is adjusted by the first throttle valve 30 upstream of the valve spool 53, and the bypass passage 1
The upstream pressure of 6 is low and the bypass passage 1
6 between the upstream side and the downstream side (valve spool 5
Since the differential pressure between the throttle valves 3 and 3) remains small and approximately constant, the amount of leakage in the valve spool 53 is always small and approximately constant; in reality, both throttle valves 3
0.40 has almost no adverse effect on flow rate adjustment.

Further, in this embodiment, since the bypass passage 16 is configured to be opened and closed by the valve spool 53, the configuration of the shutoff valve 50 is not made unnecessarily complicated. That is, if the bypass passage 16 is configured to be opened and closed using a poppet instead of the valve spool 53, even if the poppet 52 closes the pilot passage 14 in the first stage operation, the above-described substitute poppet will still open and close the bypass passage 16. There is a need for a configuration in which the plunger 58 and the like can be pushed in after the bypass passage 16 is closed so that the above-mentioned substitute poppet securely closes the bypass passage 16 by a two-stage operation. The shut-off valve 50
The structure is complicated, the number of parts is large, and the cost is high.

In the above embodiment, the main passage 13 connecting both the ports 11 and 12 was opened and closed by the poppet 51, and the pilot passage 14 was opened and closed by the poppet 52. As shown, both ports 11
The communication path 113 connecting 1 and 112 is connected to the poppet 1.
It is also possible to implement it by opening and closing with 52. In the flow rate regulating valve V11 with a shut-off valve shown in FIG.
14, and a check valve 151 that allows free flow from the first port 111 to the second port 112 is interposed in the communication path 114. The other configuration is the flow rate regulating valve V with a shut-off valve of the above embodiment.
Since it is clear from the figure that it is substantially the same as 1, similar reference numerals are used and the explanation thereof will be omitted.
Further, since the operation of this flow rate regulating valve V11 with a shut-off valve can be easily understood from the explanation of the operation of the above embodiment and the configuration shown in FIG. 2, the explanation thereof will be omitted.

Note that in the shut-off valve 50 of the flow rate regulating valve with shut-off valve V1 shown in FIG. Even when a large amount of fluid flows between both ports 11 and 12, the main passage 13
By simply increasing the size of the poppet 51, there is no need to increase the size of other components, and the shut-off valve 50 can be improved.
can be made smaller. On the other hand, the shut-off valve shown in FIG. 2 requires the third communication passage 114 and the check valve 151 in order to obtain the same function as the shut-off valve 50 shown in FIG. Since the poppet 51, pilot passage 14, check valve 54, etc. shown in the figure are not necessary, the shutoff valve can be made compact.

[Brief explanation of the drawing]

FIG. 1 is a fluid circuit diagram showing an example in which a flow rate regulating valve with a shut-off valve according to the present invention is used in a feed control device of a machine tool, FIG. 2 is a partial sectional view showing another embodiment of the present invention, and FIG. The figure shows a conventional example. Explanation of symbols, 10... Valve body, 11... First port, 12... Second port, 13, 14... Main passage, pilot passage (first communication passage), 13c
...Valve seat, 15...Communication path (second communication path), 16
...Bypass passage, 30...First variable throttle valve, 4
0...Second variable throttle valve, 50...Shut-off valve, 51, 52...Poppet, 53...Valve spool, 55a...Valve seat, 58...Plunger,
S1, S2...Return spring, S3...Connection spring.

Claims (1)

[Claims] 1. First and second ports through which fluid flows in and out; first and second communication passages that are parallel to each other and connect these ports; and a first and second communication passageway that branches from an intermediate portion of the second communication passageway and continues to the first port. a valve body having a bypass passage disposed coaxially with a part of the first communication passage; when assembled to the valve body and operated one step by mechanical operation, the valve body closes the first communication passage; The bypass passage is opened 2
When the step operation is performed, the first communicating passage and the bypass passage are closed, and when the mechanical operation is released, the first passage is returned to its original position by the spring force.
A shutter-off valve that opens a communication passage and a bypass passage, a first throttle valve that is interposed in a portion of the valve body between the second port and the bypass passage in the second communication passage and regulates the flow rate, and the valve body. A second throttle valve is provided between the bypass passage and the first port in the second communication passage of the machine to regulate the flow rate, and the second throttle valve regulates the flow rate of the fluid flowing from the second port to the first port of the machine. In the flow rate regulating valve with a shut-off valve, the flow rate of the fluid can be adjusted as a free flow, a first-stage throttled flow by the first throttle valve, or a two-stage throttle flow by the both throttle valves according to a specific operation. A poppet that is interposed in a part of the first communication passage and moves in the axial direction to sit on and separate from a valve seat provided in the first communication passage to open and close the first communication passage. a return spring that locks at one end and biases the poppet in the direction of opening; a return spring that is interposed in a portion of the bypass passage and disposed coaxially with the poppet and moves in the axial direction to open the poppet; A valve spool that opens and closes the passage, a connecting spring that is retractably interposed between the valve spool and the poppet and elastically connects the valve spool and the poppet, and a connecting spring that is fitted into the valve body so as to be retractable in the axial direction. the valve spool and the poppet are arranged coaxially with each other, and when the valve spool and the poppet are operated in one step by the mechanical operation, the poppet is pushed into the valve body and the poppet is seated on the valve seat to close the first communication passage. and when the valve spool, the spring, and the poppet are pushed against the spring force of the return spring to a position where the valve spool does not close the bypass passage, and the mechanical operation is performed in the second stage, the first stage is operated. and a plunger that further pushes the valve spool against the spring force of the connection spring to a position where the valve spool closes the bypass passage by being pushed further into the valve body than when the valve spool is closed. A flow regulating valve with a shut-off valve.