JPH0544625Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a directional control valve with a manual operation device in which communication between ports can be switched by manual operation.

[Prior Art] Directional switching valves operated by pilot fluid that are equipped with a manual operating device for manually operating the main valve are already known.

However, the above-mentioned manual operation device requires special consideration regarding the installation posture and location. If these considerations are not taken, manual operation will be troublesome and cannot be performed quickly, and the fluid passages of the main valve and pilot valve will be damaged. There is a problem that the configuration becomes complicated.

[Problems to be solved by the invention] This invention has a manual operation device that can be operated from above installed between the main valve and the pilot valve, which simplifies the configuration of the fluid passage and facilitates manual operation. This is the problem to be solved.

[Means for Solving the Problems] In order to solve the above problems, the present invention has a plurality of ports and drives the valve body by a pilot fluid supplied and discharged to a drive chamber provided at one end of the valve body. and a main valve that is reset to switch communication between the ports, and a pilot valve that switches the output passage of the pilot fluid communicating with the drive chamber to an input passage that communicates with a pressure fluid source and an exhaust passage that communicates with the outside. and,
In the directional control valve with a manual operation device, the manual operation device is installed between the drive chamber side of the main valve and the pilot valve, and the manual operation device is installed between the drive chamber side of the main valve and the pilot valve. The input and output passages of the drive chamber and the pilot valve are opened in a valve chamber opened on the top surface of the manual operating device, and an operating rod is inserted into the valve chamber airtightly and slidably from the opening. A manual valve body that connects the output passage and the drive chamber to block communication between the input passage and the drive chamber, and presses the drive chamber to communicate with the input passage to cut off the communication between the output passage and the drive chamber. It is characterized by the fact that it has been established.

[Operation] When the pilot valve supplies and discharges pilot fluid to the drive chamber, the valve body is driven and returned to switch communication between the ports of the main valve.

If the main valve cannot be operated by the pilot valve due to an accident such as a power outage, press the operating rod and connect the drive chamber with one of the passages using the manual valve body, and the pilot valve will open in the drive chamber. Since fluid is supplied and discharged, communication between the ports of the main valve can be switched, and this operation is extremely easy as all that is required is to press the operating rod downward.

In addition, the manual operating device is installed between the drive chamber side of the main valve and the pilot valve body, and the input passage and output passage of the drive chamber and the pilot valve are opened into the valve chamber of the manual operating device. Since the pilot fluid can be supplied to and discharged from the main valve drive chamber by the valve and the manual operation device through the same passage, the construction of the passage is extremely simple.

[Embodiment] Fig. 1 shows a first embodiment of the present invention, and this directional control valve includes a main valve 1 and a pilot solenoid valve 2 which are integrally connected by a connecting device (not shown).
and a manual operating device 3 between the valves 1 and 2.

The valve body 5 of the main valve 1 has an input port P located approximately in the center in the axial direction, output ports A on both sides thereof,
B, and further includes discharge ports EA, EB on both sides thereof, and a flow path 6 that communicates these ports, and the flow path 6
A spool 7 is slidably inserted into the valve body 5.
A return pressure chamber 9 formed by an end plate 8 with one end closed is communicated with the input port P through a return pressure passage 10, and a return spring 11 is contracted in the return pressure chamber 9. Also, spool 7
A piston 12 provided integrally or separately at the other end
is formed to have a larger diameter than the spool 7, and is slidably inserted into the cylinder of the device main body 13 of the manual operating device 3, and connects the cylinder to the drive chamber 14 on the manual operating device side and the breathing chamber on the main valve side. It is divided into 15 rooms.

The main body 13 of the device is provided with a valve chamber 16 between the drive chamber 14 and the pilot solenoid valve 2, the upper enlarged diameter portion of which opens on the top surface of the main body 13, and the fluid passage 10a communicating with the supply port P is connected to the valve chamber. 16 enlarged diameter portion 16a
The drive passage 17 communicating with the drive chamber 14 is connected to the valve chamber 1.
6 each has an opening. On the other hand, the valve chamber 16
The operating rod 18 inserted into the operating rod 18 has a pressing part 19 that slides airtightly on the enlarged diameter part 16a, and a manual valve body 20 that has a smaller diameter than the pressing part 19 and slides airtightly in the valve chamber 16. The sliding distance in the axial direction is regulated by the stopper 22 engaging with the engaging portion 21 formed in the valve chamber 19, and the stopper 22 is always engaged by the spring 23 contracted at the bottom of the valve chamber 16. The operating rod 18 is urged to engage with the bottom wall of the joint 21, and in this state, the upper surface of the operating rod 18 is located approximately on the same plane as the upper surface of the device main body 13.

The pilot solenoid valve 2 includes an input passage 26 and an output passage 27 that open into the valve chamber 16, an exhaust passage 28 that opens to the outside, and a valve member that alternately communicates the output passage 27 with the input passage 26 and the exhaust passage 28. It includes a movable iron core 29 provided at both ends and its return spring 30, and when energized, the passages 26 and 27 are communicated and the passage 28 is closed, and when the energization is removed, the biasing force of the return spring 30 closes the passage 27. This is a well-known solenoid valve that closes the passage 26 by communicating the passage 26 with the passage 26.

When the manual valve body 20 is raised by the biasing force of the spring 23, the passages 17, 26, and 27 communicate with each other.
6 is cut off and the manual valve body 20 is lowered by pressing the operating rod 18, the passages 17 and 26 communicate with each other and open at the position where the communication between the passages 17 and 27 is cut off, and the fluid passage 10a and input passage 26
is always in communication regardless of the position of the manual valve body 20.

Next, the operation of the first embodiment will be explained.

FIG. 1 shows the pilot solenoid valve 2 in a de-energized state, in which the passage 26 is blocked and the passages 27 and 28 are in communication, and the operating rod 18 is raised by the biasing force of the spring 23, so that the passages 17 and 27 are in communication. ing. Therefore,
Since the fluid in the drive chamber 14 is discharged to the outside, the spool 7 is able to maintain the fluid pressure in the return pressure chamber 9 and the return spring 1.
Ports P and A and ports B and EB are in communication with each other due to the biasing force of 1.

When the pilot solenoid valve 2 is energized in this state,
Since the passages 26 and 27 communicate with each other and the passage 28 is blocked, pilot fluid is supplied to the drive chamber 14.
The spool 7 is moved to the left in the figure by the fluid pressure acting on the large-diameter piston 12, and is switched to a position where ports P and B and A and EA communicate with each other.

When the pilot solenoid valve 2 is de-energized, the passage 26 is shut off and the passages 27 and 28 are communicated with each other, so that the fluid in the drive chamber 14 is discharged to the outside, and the spool 7 is drained of the fluid in the return pressure chamber 9 and the return spring 11. The biasing force switches to the illustrated position where ports P and A and B and EB communicate with each other.

If an accident such as a power outage occurs while the main valve 1 is operating, the biasing force of the return spring 30 will cause the passage 26 to
is closed, the passages 27 and 28 communicate with each other, and the drive chamber 14
Since the fluid is discharged to the outside, the spool 7 is switched to the position shown in FIG.
The main valve cannot be operated due to In this case, when the operating rod 18 is pressed to a position where the stopper 22 engages with the upper wall of the engaging portion 21, the manual valve body 20
blocks the communication between passages 17 and 27, and
6, the pressure fluid supplied to the drive chamber 14 causes the spool 7 to communicate with ports P, B, and A.
and EA are switched to a position where they communicate.

When the pressure on the operating rod 18 is released, the manual valve body 20 returns due to the biasing force of the spring 23 and the passages 17 and 27 are brought into communication, and the passages 17 and 26 are disconnected from each other, so that the fluid in the drive chamber 14 is is discharged to the outside through passages 27 and 28, and the spool 7 is connected to ports P and A.
and switches to a position where B and EB communicate.

Therefore, even if the pilot solenoid valve 2 cannot operate the main valve due to an accident such as a power outage,
Communication between the ports of the main valve 1 can be switched by pressing and releasing the pressing of the operating rod 18 in the manual operating device 3.

The manual operation described above is extremely easy as it is performed by pressing and releasing the pressure of the operating rod 18 inserted into the valve chamber 16 whose top surface is open. Since the diameter is larger than the outer diameter of the body 20, together with the biasing force of the spring 23, the operating rod 18 can be quickly returned to its original position.

Further, a manual operation device 3 is provided between the drive chamber 14 side of the main valve 1 and the pilot solenoid valve 2,
The passages 17, 26, and 27 for supplying and discharging pressure fluid to and from valves 4 and 4 are used both for pilot operation using the pilot solenoid valve 2 and for manual operation using the manual operating device 3, making it easy to configure the passages for the valves 1 and 2. In addition, the operating rod 18 can be pressed without being obstructed by the power supply line of the pilot solenoid valve 2.

FIG. 2 shows a second embodiment of the present invention, in which an operating rod 34 in this manual operating device 33 has an engaging portion 35.
A locking groove 36 into which the stopper 22 is inserted is provided in the side wall of the housing.

In the second embodiment, the operating rod 34 is moved to the stopper 22.
By pressing the stopper 22 so that it engages with the upper wall of the engaging portion 35 and then rotating it to lock the stopper 22 in the locking groove 36, the pressing position of the operating rod 34, in other words, the manual valve body 20 The communicating position of the passages 17 and 26 can be maintained.

The other configurations and operations of the second embodiment are the same as those of the first embodiment, so the same reference numerals are given in the drawings and detailed explanations will be omitted.

FIG. 3 shows a third embodiment of the present invention, and this manual operating device 38 has an operating rod 39 and a valve body configured separately, and is screwed into the partition wall of the valve chamber 40 and the lower wall of the valve chamber. Attach the valve seats 42 and 4 to the tip of the valve fitting 41 that has been attached.
3 are formed facing each other, and the valve seats 42, 43
The valve member 44, which alternately opens and closes the valve member 44, is always urged in a direction to close the valve seat 42 by a spring 45 compressed between the valve member 44 and the valve fitting 41. On the other hand, operation rod 3
9 has its tip extending through the valve seat 42 to a position close to the valve member 44 that closes the valve seat 42 , and the drive passage 17 is connected to the valve chamber 40 and the input passage 26 is connected to the valve chamber 40 .
is opened to the valve seat 42, and the output passage 27 is opened to the valve seat 43.

Since the other configurations and operations of the third embodiment are the same as those of the first embodiment, the same reference numerals are given in the drawings and detailed explanations will be omitted.

Note that the main valve in the present invention is not limited to a 5-port valve, and the pilot valve is not limited to a solenoid valve, but may be operated by fluid pressure or the like.

[Effects of the invention] The invention provides a manual operating device installed between the driving chamber side of the main valve and the pilot valve, and an input passage and an output passage of the driving chamber and the pilot valve in the valve chamber of the manual operating device. By opening the valve, fluid can be supplied and discharged from the drive chamber by the pilot valve and the manual operation device through the same passage, so that the passage configuration of the main valve and the pilot valve can be extremely simplified.

In addition, the valve chamber is opened on the top surface of the manual operation device, and the manual operation device is operated by pressing the operation rod inserted into this opening, so it is easy to take up the space required for operation, and manual operation is easy. This can be done promptly.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a first embodiment of the present invention, and FIGS. 2 and 3 are sectional views showing essential parts of other embodiments of the present invention. 1...Main valve, 2...Pilot solenoid valve, 3,3
3, 38...Manual operation device, 7...Spool, 1
4...Drive chamber, 16,40...Valve chamber, 18,3
4, 39...operation rod, 26...input passage, 27...
...Output passage, 28...Exhaust passage.

Claims (1)

[Scope of Claim for Utility Model Registration] A main valve that has a plurality of boats and switches communication between ports by driving and returning the valve body by pilot fluid supplied and discharged to a drive chamber provided at one end of the valve body; A pilot valve that switches a pilot fluid output passage communicating with the drive chamber to an input passage communicating with a pressure fluid source and an exhaust passage communicating with the outside, and a manual operation for supplying and discharging pilot fluid to the drive chamber. In the directional control valve with a manual operation device, the manual operation device is installed between the drive chamber side of the main valve and the pilot valve, and the manual operation device has a valve chamber opened on the top surface of the manual operation device, The input passage and the output passage of the drive chamber and the pilot valve are opened, and the operation rod is inserted into the valve chamber through the opening in an airtight and slidable manner, and the output passage and the drive chamber are normally connected to the input passage. With a manual operating device, characterized in that a manual valve element is provided that blocks communication between the passage and the drive chamber, causes the drive chamber to communicate with the input passage by pressing, and blocks communication between the output passage and the drive chamber. Directional valve.