JPH0124950B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device in which a main valve itself equipped with a low flow adjuster (adjusting valve) can be opened and closed in two stages.

Generally, in a fixed-rate liquid supply system that supplies liquid to tanker trucks at a liquid supply station, a flow meter and a metering valve (open at the start of liquid supply and receive a signal from the flow meter when the desired amount is reached) are installed in the liquid supply line in sequence. (The valve closes in response to
A loading arm (inserted into the tank of the lorry vehicle) is provided, and a two-stage open/close metering valve will be explained below.

FIG. 1 shows a two-stage open/close metering valve 1 as a conventional valve device. In the figure, a valve body 2 of a metering valve 1 has a main valve seat 2a, and a main valve body 3 fitted into a cylindrical body portion 2b is seated on the main valve seat 2a by a spring 4. The main valve seat 2a and the main valve body 3 constitute a main valve 5, which defines a primary chamber 2c and a secondary chamber 2d. The main valve body 3 has a central hole 3a, an auxiliary valve seat 3b, and flow paths 3c and 3d.
An auxiliary valve body 6 fitted into the central hole 3a is seated on the auxiliary valve seat 3b by a spring 7. The auxiliary valve seat 3b and the auxiliary valve body 6 constitute an auxiliary valve 8. Reference numeral 9 denotes a manifold, which has a plurality of valves and flow paths inside, and is connected to the primary chamber 2c, secondary chamber 2d, main valve upper chamber 2e, and auxiliary valve upper chamber 2f via piping lines 10a to 10d, respectively. .

At the start of liquid supply, first, by operating the manifold 9, the liquid in the auxiliary valve upper chamber 2f is released to the secondary chamber 2d via the flow path 3d and lines 10d, 10b to reduce the pressure. The auxiliary valve 8 opens and the liquid in the primary chamber 2c flows into the flow path 3.
c, it begins to flow to the secondary chamber 2d side via the auxiliary valve 8 (one step open (half open) state). Next, line 10c, 1
The liquid in the main valve upper chamber 2e is transferred to the secondary chamber 2d via 0b.
When the main valve body 3 is similarly moved upward and the main valve 5 is opened, the liquid flows to the secondary chamber 2d via the main valve 5 and the auxiliary valve 8 (two-stage opening). (fully open state).

Next, at the end of liquid supply, the liquid on the primary chamber 2c side is led to the main valve upper chamber 2e through the lines 10a and 10c, and the main valve 5 is closed (one-stage closed (half-closed)), contrary to the above case. state), lines 10a, 10d,
The primary chamber 2c is connected to the auxiliary valve upper chamber 2f via the flow path 3d.
The liquid on the side is guided, and the auxiliary valve 8 is closed (two-stage closed (fully closed) state).

However, according to the above conventional example, two valves, a main valve and an auxiliary valve, are required for the supply liquid to pass through, and the control liquid passage is also complicated, requiring a dedicated manifold. The disadvantages are that the operation is complicated and troublesome, and the cost is high.

The present invention simplifies the overall configuration and operation by providing only the main valve as the valve through which the supply liquid passes, as well as a low flow adjuster (adjusting valve) for controlling hydraulic pressure and two communication passage opening/closing means. It is an object of the present invention to provide a valve device that can reduce costs.

The configuration for this purpose includes a main valve in which a first valve seat is provided on the valve body and a first valve element that can freely move toward and away from the valve seat, and the valve body and the first valve are arranged in a primary chamber of the main valve. A diaphragm membrane fixed between the bodies and defining a diaphragm chamber, a first communication passage communicating the diaphragm chamber with the secondary side of the main valve, and a first communication passage disposed in the middle of the first communication passage. a second valve seat and a second valve seat that faces the second valve seat and is displaced integrally with the first valve body and seats on the second valve seat when the first valve body moves a predetermined amount in the valve opening direction; a first communication passage opening/closing means disposed in the middle of the first communication passage; and a second communication passage communicating between the primary side of the main valve and the diaphragm chamber. a third communication path communicating between the passage, the diaphragm chamber and the secondary side of the main valve; a throttle disposed midway in the second communication passage; The communication passage opening/closing means is comprised of two communication passage opening/closing means.

Next, one example will be described.

FIG. 2 is a longitudinal sectional view of a metering valve to which an embodiment of the valve device according to the present invention is applied.

In the figure, the metering valve 11 includes a valve body 12 and a lid body 13.
The valve body 12 has a main valve seat 12a, a primary chamber 12
b (hydraulic pressure P ₁ ) and a secondary chamber 12c (hydraulic pressure P ₂ ).

Reference numeral 14 denotes a main valve body, and a main valve shaft 15 provided integrally with this body is fitted and guided into an outer cylinder 25, which will be described later, so that it can freely move up and down, and is supported by being biased downward by a spring 16. He is seated on seat 12a.
The main valve seat 12a and the main valve body 14 constitute a main valve 17. The main valve shaft 15 has a shaft 18 at the upper end as shown in FIG.
A ring-shaped poppet 19 is fitted onto the shaft 18 so as to be movable up and down, and is urged upwardly by a spring 20 and pressed against a retaining ring 21.

22 is a diaphragm membrane, the peripheral part of which is the valve body 12
and the lid body 13, and the central part is fixed to the main valve body 14 by a diaphragm retainer 23, and a diaphragm chamber 12d (hydraulic pressure
P ₃ ).

24 is a low flow adjuster (Low Flow
The adjuster is roughly composed of an outer cylinder 25, a guide rod 31, and the above-mentioned poppet 19, and the guide rod 31 is screwed into the upper part of the outer cylinder 25 and locks into the lock nut 32.
Fixed by The outer cylinder 25 is inserted and fixed to the upper part of the lid body 13 via the mounting plate 33. At this time, the main valve shaft 15 is coaxially fitted into the lower part of the outer cylinder 25, and the poppet 19 is spaced apart and opposed to the valve seat 31b at the lower end of the flow path 31a of the guide rod 31. The valve seat 31b and the poppet 19 constitute a regulating valve 34, and the diaphragm chamber 1
2d is connected to a piping line 38, which will be described later, through a hole 25a of the outer cylinder 25, a flow path 25b, a regulating valve 34, a flow path 31a, and a hole 25b. Also 35, 36,
37 are O-rings for sealing.

38 is a piping line as a first communication passage, which communicates the hole 25b of the outer cylinder 25 and the secondary chamber 12c, and a solenoid valve 3 as a means for opening and closing the first communication passage is installed in the middle of the piping line.
It has 9.

A piping line 40 communicates with the diaphragm chamber 12d, and its ends communicate with the primary chamber 12b and secondary chamber 12c via piping lines 41 and 42, respectively.
The lines 40 and 41 constitute a second communication path 43,
A throttle 44 is provided in the middle of the line 41, lines 40 and 42 constitute a third communication path 45, and a solenoid valve 46 is provided in the middle of the line 42 as a means for opening and closing the second communication path.

Before the start of liquid supply, the electromagnetic valves 39 and 46 are both de-energized and in the upper switching position, respectively, in FIG. 2, cutting off the lines 38 and 42, before the liquid supply starts. Therefore, the liquid in the primary chamber 12b is introduced into the diaphragm chamber 12d via the lines 41, 40 (second communication path 43) and has a liquid pressure of P ₁ =P ₃ , so that the main valve body 1
4 is urged downward by the hydraulic pressure difference of P ₃ (=P ₁ ) - P ₂ acting on it and the urging force of the spring 16 and seats on the valve seat 12a, and the main valve 17 is closed. There is. Furthermore, since the main valve shaft 15 is at its lower limit of movement, the poppet 19 is also at its lower limit of movement, and the regulating valve 34 is fully open.

Next, the operation of the metering valve 11 will be explained.
At the start of liquid supply, the solenoid valve 39 is first energized and slides downward in FIG. 2 to bring the piping line 38 into communication. Then, the diaphragm chamber 12d
Since the liquid pressure P ₃ of the liquid is higher than the liquid pressure P ₂ (approximately atmospheric pressure) in the secondary chamber 12c, the flow path 25 of the outer cylinder 25
b, regulating valve 34, flow path 31a, and further line 38
It begins to flow out to the secondary chamber 12c side through. At this time, the liquid on the primary chamber 12b side flows into the diaphragm chamber 12d via the lines 41 and 40 (second communication path), but the inflow amount is throttled by the throttle 44, so it is small compared to the outflow amount. . Therefore, the amount of liquid in the diaphragm chamber 12d gradually decreases, and the liquid pressure increases.
The value of P ₃ becomes smaller.

Therefore, the main valve body 14 starts to move upward due to the hydraulic pressure _P1 acting on the diaphragm membrane 22, and the poppet 19
is close to the valve seat 31b. Therefore, the opening degree of the regulating valve 34 becomes smaller, and the amount of outflow from the diaphragm chamber 12d gradually becomes smaller, and becomes the same as the amount of inflow from the line 40 when the main valve body 14 moves upward to a predetermined position. Therefore, at this time, the diaphragm chamber 12
Since the liquid amount d is balanced at a constant level, the main valve body 14 is also stopped at the above-mentioned predetermined position during upward movement and is balanced at that position.

In this way, the main valve 17 is balanced in a one-stage open (half-open) state, and the liquid in the primary chamber 12b begins to steadily flow toward the secondary chamber 12c via the main valve 17, and liquid supply is started.

Next, after a predetermined period of time has elapsed since the start of the liquid supply, the electromagnetic valve 46 is energized and slid downward in FIG. 2 to bring the line 42 into communication. Then, the diaphragm chamber 12d is connected to the secondary chamber 1 via the lines 40 and 42 (third communication path) in addition to the line 38.
It will be in communication with 2c. However, since the liquid pressure _P3 of the liquid in the diaphragm chamber 12d is greater than the liquid pressure _P2 in the secondary chamber 12c (the liquid pressure in the secondary chamber 12c is
Since the main valve 17 is in a half-open state, the hydraulic pressure value of _P2 is still small), and begins to flow out to the secondary chamber 12c via the lines 40 and 42. Therefore, the diaphragm chamber 12d
The liquid amount decreases further, and the liquid pressure _P3 also decreases.

Therefore, the main valve body 14 starts to move upward again from the above mid-movement position, the poppet 19 comes into contact with the valve seat 31b, the regulating valve 34 is closed, and the diaphragm chamber 12
d no longer flows out through line 38. The main valve body 14 further moves upward, and for example, the diaphragm retainer 23 comes into contact with the lower end of the outer cylinder 25 and stops (during this time, the poppet 19 compresses the spring 20 and maintains the closed state of the regulating valve 34 while the shaft 18 ), the main valve 17 is open in two stages (fully open)
state. In this way, a large amount of liquid in the primary chamber 12b is constantly transferred to the secondary chamber 12c via the main valve 17.
The liquid begins to flow to the side and continues to be supplied.

Next, at the end of liquid supply, the solenoid valve 46 is first de-energized and switched back to the solid line position in FIG.
Line 42 is cut off. Then diaphragm chamber 1
2d, both lines 38 and 42 in the outflow direction are closed, and the liquid from the primary chamber 12b side is gradually flowed in through the lines 41 and 40 (restriction 44), the amount of liquid increases, and the liquid pressure P ₃ also increases. . As a result, the main valve body 14 starts moving downward, and at the same time, the poppet 19 also moves toward the shaft 1.
8, and eventually returns to contact with the retaining ring 21. From this point onwards, the main valve body 1
4 moves downward, the poppet 19 separates from the valve seat 31b, the regulating valve 34 opens, and the diaphragm chamber 1
The liquid in 2d begins to flow out via the regulating valve 34 and line 38 again.

When the main valve body 14 moves further down and the outflow amount gradually increases until it becomes the same as the inflow amount from the lines 41 and 40, the amount of liquid in the diaphragm chamber 12d is balanced at a constant level, and the main valve body 14 It stops at a predetermined position during the downward movement. As a result, the main valve 17 is balanced in a one-stage closed (half-closed) state (same as the one-stage open state), and the flow of liquid through the main valve 17 is throttled.

Next, the electromagnetic valve 39 is de-energized and the line 39 is cut off as shown in FIG. Then, the diaphragm chamber 12d again connects both lines 3 in the outflow direction.
Both lines 8 and 42 are closed, and lines 41 and 40 are still closed.
The liquid is flowed into the diaphragm chamber 12d through the diaphragm chamber 12d.
The hydraulic pressure _P3 increases, the main valve body 14 starts moving downward again and seats on the main valve seat 12a, and the main valve 17 is closed in two stages (fully closed).

By varying the screwing amount of the guide 31, the one-stage open (or one-stage closed) position of the main valve body 14 can be variably set, and as in the past, changing this position required replacing the auxiliary valve. Compared to things, it's less troublesome.

According to the above configuration and operation, the main valve 17 is the only valve through which the supply liquid passes, and the low flow adjuster 24 (adjusting valve 34) and two electromagnetic valves 39 and 46 are simply provided for controlling the hydraulic pressure. There is no need for an auxiliary valve, manifold, or complicated piping for passing the supply liquid, and the configuration and operation can be greatly simplified.

Here, in the above-described metering valve 11, since the supply liquid itself is bypassed and guided and the main valve 17 is opened/closed by the hydraulic pressure, the hydraulic pressure due to the head corresponding to the rising dimension of the loading arm is, for example, in the opposite direction. A large hydraulic pressure acts on the secondary chamber 12c due to reasons such as the loading arm contracting during the night and the hydraulic _pressure inside increasing. If the hydraulic pressure becomes larger than _P1 , the main valve body 14 may move upward, causing the main valve 14 to open unnecessarily.

The metering valve 51 shown in FIG. 4 is designed to prevent the above-mentioned inconvenience, and in this figure, the same parts as those in FIG. In the figure, the metering valve 51 is the same as the metering valve 11 in FIG.
A check valve 54 is interposed in the middle of a line 53 that further branches from 8 to the diaphragm chamber 12d.
Therefore, its operation is exactly the same as that of the metering valve 11 described above.

If a hydraulic pressure P ₂ greater than the hydraulic pressure P 1 of the primary chamber 12b acts on the secondary chamber 12c side (P ₂ > P ₁ ), that hydraulic pressure _{P 2 acts} on the lower surface of the main valve body 14. At the same time, it also acts on the upper surface of the main valve body 14 via the line 53 (check valve 54) and the diaphragm chamber 12d, and the hydraulic pressure P ₃ (=P ₂ )>P ₁ , so this hydraulic pressure
The hydraulic pressure difference of P ₃ - P ₁ acts on the diaphragm membrane 22,
Together with the biasing force of the spring 16, unnecessary opening of the main valve body 14 is prevented. The check valve 52 prevents the hydraulic pressure _P2 acting on the diaphragm chamber 12d from escaping to the primary side via the lines 40 and 41.

As described above, the valve device of the present invention is applied to, for example, a two-stage open/close metering valve for a liquid supply line to a lorry vehicle, and the main valve is the only valve through which the liquid to be supplied passes, thereby simply controlling the hydraulic pressure. Since the main valve is controlled in two stages by providing a regulating valve and two communication passage opening/closing means, there is no need for auxiliary valves, manifolds, etc., greatly simplifying the overall configuration and operation, and reducing costs. It has features such as being able to reduce

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a metering valve as a conventional example of a valve device, Fig. 2 is a longitudinal sectional view of a metering valve to which an embodiment of the valve device of the present invention is applied, and Fig. 3 shows the main parts thereof. The enlarged longitudinal sectional view, FIG. 4, is a longitudinal sectional view of a modification of the metering valve. 1, 11, 51...quantity valve, 3,14...main valve body,
5, 17...Main valve, 6...Auxiliary valve body, 8...Auxiliary valve, 9
...Manifold, 12b...Primary chamber, 12c...Secondary chamber, 12d...Diaphragm chamber, 15...Main valve shaft, 1
9... Poppet, 22... Diaphragm membrane, 24... Low flow adjuster, 31... Guide rod, 34... Adjustment valve, 38... First communication path (piping line), 40,
41, 42, 53... Piping line, 39, 46... Solenoid valve, 43... Second communication path, 45... Third communication path, 52, 54... Check valve.

Claims (1)

[Claims] 1. A main valve in which a first valve seat and a first valve element that can be freely moved toward and away from the valve body are provided, and the valve body and the first valve element are stuck in the primary chamber of the main valve. is,
A diaphragm membrane that defines a diaphragm chamber, a first communication path that communicates the diaphragm chamber with the secondary side of the main valve, a second valve seat disposed in the middle of the first communication path, and A second valve body that faces the second valve seat, is displaced integrally with the first valve body, and seats on the second valve seat when the first valve body moves a predetermined amount in the valve opening direction. a first communication passage opening/closing means arranged in the middle of the first communication passage, a second communication passage communicating between the primary side of the main valve and the diaphragm chamber, and the diaphragm chamber. and a third communication passage that communicates between the secondary sides of the main valve, a throttle disposed in the middle of the second communication passage, and a second communication passage disposed in the middle of the third communication passage.
A valve device comprising a communication passage opening/closing means.