JP2007024063A - Pilot-type flow control valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pilot-type flow control valve device enabling light operation, and capable of surely closing a main valve and capable of forcibly stopping water even when an introduction small hole is clogged. <P>SOLUTION: This pilot-type flow control valve device 10 is provided with the main valve 16, a back pressure chamber 24, the introduction small hole 26 for increasing a pressure of the back pressure chamber 24, a pilot water passage 28 for reducing the pressure of the back pressure chamber 24, a pilot valve 46, and a drive shaft 30 for driving the pilot valve 46. The pilot-type flow control device 10 performs flow control of a main water passage by moving the main valve 16 forward and backward responding to the forward-and-backward movement of the pilot valve 46. A first fitting part 58 for forcibly stopping water is provided in the drive shaft 30, which is fitted to a first fitted part 62 on the main valve 16 side in accordance with movement to the valve closing direction so as to forcibly close the main valve 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flow control device, and more particularly to a pilot-type flow control device that can be easily operated with a small operating force.

Various types of faucets have been used in the past, but these faucets require a large force to move the main valve that changes the opening of the main waterway in the approaching and retracting direction relative to the main valve seat. There was a problem that operation was heavy.
Therefore, as a means to lighten the operation of the faucet, this faucet is a pilot-type flow control device, that is, by moving the pilot valve forward and backward, the main valve is moved forward and backward to change the opening of the main water channel. It is conceivable to use a faucet with a built-in pilot-type flow control device.

For example, the following Patent Document 1 discloses the configuration of this type of pilot type flow control device. FIG. 13 shows a specific example thereof.
In the figure, reference numerals 200 and 202 denote a primary inflow waterway and a secondary outflow waterway that form a main waterway, and 204 denotes a main valve composed of a diaphragm valve provided on the main waterway.
The main valve 204 moves back and forth in the approaching / separating direction with respect to the main valve seat 206 to change the opening of the main water channel, and adjusts the flow rate in the main water channel according to the opening.

Reference numeral 208 denotes a back pressure chamber formed behind the main valve 204. The back pressure chamber 208 applies an internal pressure to the main valve 204 as a pressing force in the valve closing direction.
The main valve 204 is provided with an introduction small hole 210 that passes through the main valve 204 and allows the inflow water channel 200 and the back pressure chamber 208 to communicate with each other.
The introduction small hole 210 leads the water from the inflow water channel 200 to the back pressure chamber 208 and increases the pressure of the back pressure chamber 208.
The main valve 204 is also provided with a pilot water channel 212 as a water drainage channel that passes through the main valve 204 and communicates the back pressure chamber 208 and the outflow water channel 202.
The pilot water channel 212 reduces the pressure in the back pressure chamber 208 by drawing water in the back pressure chamber 208 into the outflow water channel 202.

Reference numeral 214 denotes a pilot valve provided integrally with the drive shaft 216. The pilot valve 214 is in the vertical direction in the figure with respect to the pilot valve seat 218 provided on the main valve 204, that is, in the same direction as the forward and backward movement of the main valve 204. By moving forward and backward, the opening of the pilot water channel 212 (opening with respect to the back pressure chamber 208) is changed.
In FIG. 13, reference numeral 220 denotes an electric drive device that drives the pilot valve 214 to advance and retreat together with the drive shaft 216.

In the pilot type flow regulating device shown in FIG. 13, when the pilot valve 214 moves forward toward the pilot valve seat 218, the gap between the pilot valve 214 and the pilot valve seat 218 becomes small, and the pilot water passage 212 The opening degree becomes small, the amount of water flowing from the back pressure chamber 208 to the outflow water channel 202 through the pilot water channel 212 decreases, and the pressure in the back pressure chamber 208 increases.
On the other hand, when the pilot valve 214 moves backward in the figure, the clearance between the pilot valve 214 and the pilot valve seat 218 increases, and the opening of the pilot water passage 212 increases, and here, the back pressure chamber 208 passes through the pilot water passage 212. The amount of water that flows into the outflow water channel 202 increases and the pressure in the back pressure chamber 208 decreases.
Then, the main valve 204 moves back and forth in the vertical direction in the figure following the forward and backward movement of the pilot valve 214 so as to balance the pressure of the back pressure chamber 208 and the pressure of the inflow water passage 200 to open the main water passage. Change the degree.
The flow rate of water from the inflow water channel 200 to the outflow water channel 202 is adjusted according to the change in the opening of the main water channel.

  In the pilot type flow regulating device shown in FIG. 13, the main valve 204 is moved forward and backward based on the increase / decrease of the pressure in the back pressure chamber 208, and the increase / decrease of the pressure in the back pressure chamber 208 is controlled by the pilot valve 214. Since the main valve 204 can be opened and closed with a small force because it is controlled by advancing and retracting movement, the flow rate can be adjusted with a light operation.

  However, in this pilot-type flow control device, when the introduction small hole 210 is clogged, the water in the inflow water channel 200 cannot flow into the back pressure chamber 208 through the introduction small hole 210, and the back pressure chamber 208 is pressurized. The problem that the main valve 204 cannot be closed as a result is not included.

JP-A-4-302790

  The present invention is based on the circumstances as described above, and can be operated lightly and can reliably close the main valve and forcibly stop water even if the introduction small hole is clogged. The object of the present invention is to provide a pilot-type flow control device.

  Thus, according to the first aspect of the present invention, (a) a main valve that moves forward and backward in the approaching and separating direction with respect to the main valve seat to change the opening of the main water channel, and (b) formed behind the main valve. A back pressure chamber in which the internal pressure acts on the main valve as a pressing force in the valve closing direction; and (c) water in a primary inflow water channel in the main water channel is guided to the back pressure chamber. An inlet small hole for increasing the pressure of the pressure chamber; and (d) the back pressure chamber provided through the main valve so as to communicate with the back pressure chamber and the secondary outflow water channel in the main water channel. A pilot water channel that reduces the pressure in the back pressure chamber by draining the water into the outflow water channel, and (e) a relative position with respect to a pilot valve seat provided in the main valve by moving forward and backward in the same direction as the main valve. A pilot valve for changing the opening of the pilot water channel, and (f) a drive shaft for driving the pilot valve, the pilot valve In a pilot-type flow control device that adjusts the flow rate of the main water channel by moving the main valve forward and backward following an advancing and retreating movement, the drive shaft moves in the axial direction of the drive shaft and in the closing direction of the main valve. Accordingly, there is provided an engaging portion for forced water stop that engages with the engaged portion on the main valve side to forcibly close the main valve to stop the water.

  According to a second aspect of the present invention, in the first aspect, a first engaged portion as the engaged portion for forced water stop is provided on the main valve side, and the first engaged portion Is provided with a second engaged portion for forced valve opening at a position separated in the axial direction, and the engaging portion also serves as an engaging portion for forced valve opening. The engagement portion engages with the second engaged portion as the valve moves in the direction and the valve opening direction, and the main valve is forcibly opened.

  According to a third aspect of the present invention, in any one of the first and second aspects, the engagement portion is configured by a ring member that is fitted to the drive shaft and protrudes radially from the drive shaft. And

Effects and effects of the invention

As described above, the present invention can be applied to the driven shaft in the pilot-type flow control device that can be operated lightly with a small operating force, and to the engaged portion on the main valve side as the drive shaft moves in the axial direction and the valve closing direction. An engaging portion for forced water stop is provided that engages to forcibly close the main valve and stop water. According to the present invention, the introduction small hole is clogged, and the introduction small Even when water cannot flow into the back pressure chamber from the outflow water channel side through the hole, and the pressure does not rise in the back pressure chamber and the main valve cannot be closed, the drive shaft can be moved in the valve closing direction. The main valve can be forcibly closed by the engaging action of the engaging portion provided on the drive shaft and the engaged portion on the main valve side to stop the water.
As a result, it is possible to satisfactorily eliminate the inconvenience that water is discharged due to clogging of the introduction small holes.

  Next, according to a second aspect of the present invention, the engaging portion provided on the drive shaft is made to work as an engaging portion for forced valve opening, and the engaging portion is engaged with the second engaged portion provided on the main valve side. In this way, the main valve is forcibly opened and when the water is drained in cold regions, the main valve is forcibly opened and maintained in the open state. In addition, the problem that the main valve sticks to the main valve seat due to freezing and leads to malfunction can be solved.

According to the second aspect of the present invention, since the same engaging portion works both for forced closing of the main valve and for forced opening of the main valve, in addition to the engaging portion for forced closing, The structure can be simplified as compared with the case where the engaging portion is provided separately.
In this case, the engaging portion can be constituted by a ring member fitted to the drive shaft in a form protruding in the radial direction from the drive shaft.
If it does in this way, an engaging part can be easily provided in a drive shaft.
In the present invention, the pilot valve can be constituted by a plunger.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a pilot-type flow regulating device of the present embodiment, 12 and 14 are a primary inflow water channel and a secondary outflow water channel forming a main water channel, and 16 is provided on the main water channel. It is a main valve consisting of a diaphragm valve.
The main valve 16 includes a main valve body 18 and a rubber diaphragm film 20 held thereby.

The main valve 16 moves forward and backward in the approaching / separating direction with respect to the main valve seat 22 to change the opening of the main water channel.
Specifically, the main water passage is blocked by the main valve 16 being seated on the main valve seat 22, and the main water passage is opened by being separated upward from the main valve seat 22 in the figure.
Further, the opening degree of the main water channel is changed in accordance with the distance from the main valve seat 22 to adjust the flow rate of the water flowing through the main water channel.

A back pressure chamber 24 is formed behind the upper side of the main valve 16 in the figure.
The back pressure chamber 24 causes the internal pressure to act on the main valve 16 as a pressing force in the valve closing direction.
The main valve 16 is provided with an introduction small hole 26 that passes through the main valve 16 and allows the primary inflow water passage 12 and the back pressure chamber 24 to communicate with each other.
The introduction small hole 26 guides the water from the inflow water channel 12 to the back pressure chamber 24 and increases the pressure of the back pressure chamber 24.

The main valve 16 is also provided with a pilot water channel 28 as a water drainage channel that passes through the main valve 16 and communicates the back pressure chamber 24 and the secondary outlet water channel 14.
The pilot water channel 28 reduces the pressure in the back pressure chamber 24 by drawing water in the back pressure chamber 24 into the outflow water channel 14.

Reference numeral 30 denotes a drive shaft, which has an assembly part 31 for assembling a handle and the like, an annular projecting part 32 projecting in the radial direction, and a small diameter part (spindle part) 34 extending downward in the figure. .
A male screw 33 is provided on the outer peripheral surface of the annular projecting portion 32, and the male screw 33 is screwed into a female screw 36 provided on the body 35.
The drive shaft 30 moves back and forth in the vertical direction in the figure by the screw feeding action of the male screw 33 and the female screw 36 based on the applied rotational operation force.
The drive shaft 30, specifically, the spindle portion 34 and the body 35 are sealed watertight by an O-ring 38 as a seal ring. That is, the O-ring 38 seals the space between the spindle portion 34 and the back pressure chamber 24 in a watertight manner.

The drive shaft 30 has a spindle portion 34 penetrating through a through hole 40 formed in the central portion of the main valve body 18 and a lower end portion extending downward.
The pilot water channel 28 is formed in an annular shape between the inner peripheral surface of the through hole 40 and the outer peripheral surface of the spindle portion 34.
The main valve body 18 is formed with an annular groove 42 in the inner peripheral portion facing the through hole 40 as shown in FIG. 2 (a), and an elastic O-ring is mounted and held there. Yes.
In this embodiment, the pilot valve seat 44 is constituted by this O-ring. That is, the pilot valve seat 44 is provided on the main valve 16 by assembling the O-ring to the main valve body 18 of the main valve 16.

1, 2, and 3, reference numeral 46 denotes a pilot valve that is integrally formed with the spindle portion 34 of the drive shaft 30, and has a concave portion 48 that forms a ring around the shaft center.
Each end portion in the axial direction of the concave portion 48 is a tapered surface 50 having a gradually decreasing diameter toward the central portion in the axial direction of the concave portion 48, and between the tapered surface 50 and the straight shape portion 56 in the axial direction. Stepped portions 52 and 54 are formed on the top.
In the pilot valve 46, when the water is stopped, the straight-shaped portion 56 is elastically fitted in a watertight manner to the pilot valve seat 44 formed of an O-ring to block the pilot water passage 28.
At this time, the main valve 16 sits on the main valve seat 22 and closes the main water channel. FIG. 3 shows the water stop state.

From this state, the pilot valve 46 moves backward in the figure, that is, in the upward direction in the figure relative to the pilot valve seat 44 provided in the main valve 16 to open the pilot water channel 28, and further in the upward direction in the figure. The opening degree of the pilot water channel 28 is greatly changed according to the amount of movement of the pilot valve seat 44, that is, the distance from the pilot valve seat 44.
On the other hand, the opening of the pilot water channel 28 is reduced by the forward movement downward in the figure, the stepped portion 52 contacts the pilot valve seat 44, and the straight shape portion 56 is elastically fitted to the pilot valve seat 44. This closes the pilot waterway 28.

In this embodiment, the main valve 16 closes the main water passage when seated on the main valve seat 22 (see FIG. 3), and the straight shape portion 56 of the pilot valve 46 is elastically fitted to the pilot valve seat 44. That is, when the pilot valve 46 is closed, when the drive shaft 30 is rotated backward in the drawing (in the valve opening direction) by the rotation operation of the drive shaft 30, there is a gap between the pilot valve 46 and the pilot valve seat 44. This occurs (FIG. 4 (I)).
The water in the back pressure chamber 24 is drawn out to the outflow water channel 14 side through the pilot water channel 28 through the gap, and the pressure in the back pressure chamber 24 decreases.

Then, the pressure of the inflow water channel 12 overcomes the pressure of the back pressure chamber 24, and the main valve 16 is moved upward, that is, moved backward as shown in FIG. The main valve 16 stops at a position where the pressure and the pressure of the inflow water channel 12 are just balanced.
At this time, a gap is formed between the main valve 16 and the main valve seat 22, and water flows from the inflow water channel 12 to the outflow water channel 14 through the gap.
If the pilot valve 46 further moves upward in the drawing as shown in FIG. 4 (III) from this state, the main valve 16 is made to balance the pressure of the back pressure chamber 24 and the pressure of the inflow water passage 12. Following the backward movement of the pilot valve 46, it moves backward in the figure to increase the flow rate of water by further increasing the opening in the main water channel.

  On the other hand, as shown in FIG. 5 (I), when the pilot valve 46 moved backward is moved forward downward in the figure, and the clearance between the pilot valve 46 and the pilot valve seat 44 becomes smaller, the back is here. The pressure in the pressure chamber 24 increases and overcomes the pressure in the inflow water channel 12, so that the main valve 16 moves forward in the downward direction in the figure as shown in FIG. 5 (II) so as to balance those pressures. In addition, the gap between the main valve seat 22 is reduced. That is, the flow rate of water from the inflow water channel 12 to the outflow water channel 14 is decreased.

  If the pilot valve 46 further advances downward in the figure as shown in FIG. 5 (III) from this state, the main valve 16 advances downward in the figure following this, further reducing the flow rate of water. Let Then, the stepped portion 52 of the pilot valve 46 abuts on the pilot valve seat 44, and the straight-shaped portion 56 is elastically fitted in close contact with the pilot valve seat 44, whereby the pilot water passage 28 is completely closed (see FIG. 3), and the flow of water from the inflow water channel 12 to the outflow water channel 14 is stopped here.

  As shown in FIGS. 4 and 5, in this embodiment, the pilot valve 46 and the pilot valve seat 44, that is, between the main valve 16 and the main valve 16, except for the completely closed state, are always between them. Create a gap. Then, the main valve 16 moves forward and backward by changing the gap large or small, and adjusts the flow rate of water in the main water channel.

In the present embodiment, as shown in the partially enlarged views of FIGS. 1 and 2, the pilot valve 46 is forcibly closed (for forced water stop) on the drive shaft 30 on the upper side in the figure, specifically on the spindle portion 34. The first engaging portion 58 is provided in a form protruding from the spindle portion 34 in the radial direction.
The first engagement portion 58 is constituted by an elastic ring 59 such as an E ring fitted in the fitting groove 64 of the spindle portion 34.
Further, a second engagement portion 60 for forced valve opening having the same configuration is provided at the lower end portion of the spindle portion 34, specifically, the end portion protruding downward from the main valve 16. Similarly to the first engagement portion 58, the second engagement portion 60 is also composed of an elastic ring 59 fitted in the fitting groove 64 of the spindle portion 34.

In the present embodiment, the first engagement portion 58 functions as follows.
That is, the pilot-type flow control device 10 of the present embodiment can perform a required flow rate adjustment operation by allowing the water in the inflow water channel 12 to flow into the back pressure chamber 24 through the introduction small hole 26. As shown in FIG. 6, when the introduction small hole 26 is clogged with foreign matters such as dust attached thereto, the original flow rate adjusting operation cannot be performed.
In this case, the main valve 16 remains open and cannot be closed, and water is discharged.

However, in the present embodiment, as shown in FIG. 6I, when the drive shaft 30 is moved downward in the drawing, that is, in the valve closing direction, the first engagement portion 58 is located at the upper surface of the main valve 16 in the drawing. When the drive shaft 30 is further moved downward in the drawing in this state, the first engagement portion 58 and the main valve 16 are brought into contact with and engaged with the first engaged portion 62 (FIG. 6 (II)). The main valve 16 is forcibly pushed downward in the figure by the engaging action with the first engaged portion 62, that is, in the valve closing direction, and finally is seated on the main valve seat 22 to be in the valve closing state. (FIG. 6 (III)).
Here, the water stoppage is performed, and the problem that the main valve 16 remains open and the water is discharged can be solved.

On the other hand, the second engaging portion 60 for forced valve opening functions as follows.
That is, if the main water channel is drained in a cold region, the main valve 16 cannot be opened by the water supply pressure of the inflow water channel 12.
Thus, if the main valve 16 remains seated on the main valve seat 22, the main valve 16 is fixed to the main valve seat 22 due to freezing, and the subsequent flow rate adjusting operation cannot be performed.

Here, when the drive shaft 30 is moved upward in the drawing, the second engagement portion 60 comes into contact with and engages with the second engaged portion 68 on the lower surface of the main valve 16, and further upward movement of the drive shaft 30 is performed. Thus, the main valve 16 is forcibly lifted upward in the figure and opened.
Therefore, according to this embodiment, it is possible to satisfactorily avoid the problem that the main valve 16 and the main valve seat 22 are fixed due to freezing in the seated state.
A draining groove 66 is provided on the lower surface of the main valve 16 so that the second engagement portion 60 can be satisfactorily mounted even under a state where the second engagement portion 60 is in contact with and engaged with the second engaged portion 68 of the main valve 16. The water in the pressure chamber 24 can be drawn out to the outflow water channel 14 side.

As described above, according to the present embodiment, the introduction small hole 26 is clogged, and water cannot flow into the back pressure chamber 24 from the outflow water channel 14 side through the introduction small hole 26. Even when the pressure does not increase and the main valve 16 cannot be closed, by moving the drive shaft 30 in the valve closing direction, the first engagement portion 58 provided on the drive shaft 30 and the main valve 16 side are moved. The main valve 16 can be forcibly closed by the engaging action with the first engaged portion 62 to stop the water.
As a result, it is possible to satisfactorily eliminate the inconvenience that the water is discharged due to the clogging of the introduction small hole 26.

Further, the main valve 16 can be forcibly opened by engaging the second engaging portion 60 provided on the drive shaft 30 with the second engaged portion 68 provided on the main valve 16 side. When draining water, the main valve 16 can be forcibly maintained in the open and open state, and the main valve 16 sticks to the main valve seat 22 due to freezing, leading to a malfunction. Can be solved.
Further, since the first and second engaging portions 58 and 60 are constituted by the elastic ring 59 fitted to the drive shaft 30, the first and second engaging portions 58 and 60 can be easily attached to the drive shaft 30. Can be provided.

7 to 12 show other embodiments of the present invention.
In the above embodiment, the pilot valve 46 is configured integrally with the drive shaft 30, and the drive shaft 30 passes through the back pressure chamber 24 and drives the pilot valve 46 from the back pressure chamber 24 side. In this embodiment, as shown in FIGS. 7 and 8, the pilot valve 46 formed of a plunger is provided separately from the drive shaft 30 and separable and provided in the back pressure chamber 24.
On the other hand, the drive shaft 30 is provided so as to pass through the main valve 16 from the secondary side outflow water passage 14 side and drive the pilot valve 46.

A pilot valve case 70 having a bottomed cylindrical shape is also provided in the back pressure chamber 24, and a pilot valve 46 is slidably fitted therein, and the pilot valve 46 is installed in the pilot valve case 70. It is slidably guided in the forward / backward direction.
Here, as shown in FIG. 8, the upper end portion of the pilot valve case 70 is assembled to the main valve body 18 of the main valve 16 in a fixed state by screw connection.
The pilot valve 46 is urged upward in the figure, that is, in the forward direction by a return spring 72 formed of a coil spring.

74 is a back pressure chamber case, and the back pressure chamber 24 is formed inside the back pressure chamber case 74.
The back pressure chamber case 74 has a case guide 76 into which the pilot valve case 70 is fitted so as to be slidable in the vertical direction, that is, in the forward / backward direction. You will be guided to the occasion.

In this embodiment, when the drive shaft 30 is moved downward in the drawing, that is, in the valve opening direction, the pilot valve 46 that is a separate member is pushed downward in the drawing and is formed integrally with the main valve 16. It is separated from the valve seat 44 and creates a gap with the pilot valve seat 44 as shown in FIG.
Then, the water in the back pressure chamber 24 escapes to the outflow water channel 14 side through the gap, and the pressure in the back pressure chamber 24 decreases.

Here, when the pressure of the inflow water channel 12 overcomes the pressure of the back pressure chamber 24, the main valve 16 is moved downward or retracted in the drawing as shown in FIG. The main valve 16 stops at a position where the pressure of the water and the pressure of the inflow water channel 12 are just balanced.
At this time, a gap is formed between the main valve 16 and the main valve seat 22, and water flows from the inflow water channel 12 to the outflow water channel 14 through the gap.
Thereafter, when the pilot valve 46 is further retracted downward in the figure by the drive shaft 30, the main valve 16 further retreats downward in the figure following this, and the opening of the main water channel is increased to increase the water flow. The flow rate is increased (FIG. 10 (III)).

On the other hand, as shown in FIG. 11 (I), when the drive shaft 30 is moved upward in the figure, the pilot valve 46 follows this by the urging force of the return spring and moves upward in the figure. The clearance with the seat 44 is reduced to reduce the flow rate of water (FIG. 11 (II)), and finally the pilot valve 46 is seated on the pilot valve seat 44 and the main valve 16 is seated on the main valve seat 22. The main water channel is closed here, and the flow of water stops (FIG. 11 (III)).
The basic operation of these flow rate adjustments is the same as that of the first embodiment.

As shown in FIGS. 8 and 9, also in the present embodiment, an engaging portion 78 that serves both as a forced valve closing and a forced valve opening protrudes in the radial direction on the drive shaft 30, more specifically on the spindle portion 34. It is provided in the form to do.
On the other hand, on the main valve 16 side, in detail, the main valve body 18 has a first engaged portion 62 for forced closing and a second engaged portion 68 for forced opening spaced apart in the axial direction. Is provided. Here, the engaging portion 78 is movable relative to the first engaged portion 62 and the second engaged portion 68 by a predetermined stroke.
When the engaging portion 78 can freely move within the predetermined stroke, the pilot valve 46 is driven by the drive shaft 30 and the required flow rate is adjusted.

Also in this embodiment, as shown in FIG. 9, the engaging portion 78 is elastically fitted with a substantially U-shaped elastic ring 80 in the fitting groove 64 of the drive shaft 30, specifically the spindle portion 34. Is made up of.
Further, the main valve body 18 of the main valve 16 is formed with a projecting portion 82 having a substantially truncated cone shape, and an insertion opening for the elastic ring 80 is provided in the projecting portion 82 so as to penetrate in the radial direction. The elastic ring 80 is fitted to the spindle portion 34 of the drive shaft 30 through the insertion opening, and the axial edges of the insertion opening are the first engaged portion 62 and the second engaged portion. 68.

In this embodiment, the drive shaft 30 moves upward in the drawing from the state shown in FIG. 12 (I), and the engaging portion 78 engages with the first engaged portion 62 (FIG. 12 (II)). The main valve 16 is forcibly lifted upward in the figure and is forcibly closed (FIG. 12 (III)).
On the other hand, the drive shaft 30 moves downward in the figure, and at that time, the engaging portion 78 abuts on and engages with the second engaged portion 68, whereby the main valve 16 is moved downward in the figure and forced open. Be made to speak.

  Also in the present embodiment, the drive shaft 30 is moved in the valve closing direction even when the introduction small hole 26 is clogged, the back pressure chamber 24 does not increase in pressure, and the main valve 16 cannot be closed. Thus, the main valve 16 can be forcibly closed and water stopped by the engaging action of the engaging portion 78 provided on the drive shaft 30 and the first engaged portion 62 on the main valve 16 side. Therefore, it is possible to satisfactorily eliminate the inconvenience that water is discharged due to clogging of the introduction small hole 26.

  Further, in the present embodiment, the same engaging portion 78 works both for forced closing of the main valve 16 and for forced opening. Therefore, in addition to the engaging portion for forced closing, The structure can be simplified as compared with the case where the engaging portion is provided separately.

  Although the embodiment of the present invention has been described in detail above, this is merely an example. For example, in the present invention, the pilot valve can be configured in various forms other than the plunger. For example, the present invention can be configured in various modifications without departing from the spirit of the present invention.

It is sectional drawing of the pilot type flow regulating apparatus which is one Embodiment of this invention. It is a principal part enlarged view of the embodiment. It is operation | movement explanatory drawing which shows the water stop state of the pilot type flow regulating valve apparatus of the embodiment. It is action explanatory drawing at the time of opening operation of the pilot type flow regulating device of the embodiment. It is action explanatory drawing at the time of closing operation of the pilot type flow regulating device of the embodiment. It is a figure explaining the water stop by forced valve closing of the pilot type flow regulating device of the embodiment. It is sectional drawing which shows other embodiment of this invention. It is a figure which decomposes | disassembles and shows the principal part of the pilot-type flow control apparatus of the embodiment. It is an expansion perspective view of the engaging part of the embodiment. It is action explanatory drawing at the time of opening operation of the pilot type flow regulating device of the embodiment. It is action explanatory drawing at the time of closing operation of the pilot type flow regulating device of the embodiment. It is a figure explaining the water stop by forced valve closing of the pilot type flow regulating device of the embodiment. It is a figure which shows an example of the conventional pilot type flow control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pilot type flow control apparatus 12 Primary inflow water path 14 Secondary outflow water path 16 Main valve 24 Back pressure chamber 26 Introduction small hole 28 Pilot water path 30 Drive shaft 44 Pilot valve seat 46 Pilot valve 58 First engagement Portions 59, 80 Elastic ring 60 Second engagement portion 62 First engaged portion 68 Second engaged portion 78 Engagement portion

Claims (3)

(A) a main valve that moves forward and backward in the direction of approaching and separating from the main valve seat to change the opening of the main waterway
(B) a back pressure chamber formed behind the main valve and acting on the main valve as a pressing force in the valve closing direction;
(C) an introduction small hole for guiding the water in the primary inflow water channel in the main water channel to the back pressure chamber to increase the pressure in the back pressure chamber;
(D) The back pressure chamber is provided through the main valve so as to communicate with the secondary outflow water channel in the main water channel, and water in the back pressure chamber is drawn into the outflow water channel to Pilot waterways to reduce chamber pressure and
(E) a pilot valve that moves forward and backward in the same direction as the main valve to change a relative position with respect to a pilot valve seat provided in the main valve, and changes an opening degree of the pilot water channel;
(F) a pilot-type flow control device that includes a drive shaft that drives the pilot valve, and that adjusts the flow rate of the main water channel by moving the main valve forward and backward following the forward and backward movement of the pilot valve. Forced stop that engages the engaged portion on the main valve side with the movement of the drive shaft in the axial direction of the drive shaft and the valve closing direction to forcibly close the main valve and stop the water A pilot-type flow control device having an engagement portion for water.   In Claim 1, the said main valve side is provided with the 1st to-be-engaged part as said to-be-engaged part for forced water stop, and is spaced apart from this 1st to-be-engaged part to an axial direction. The second engaged portion for forced valve opening is provided at the only position, and the engaging portion also serves as an engaging portion for forced valve opening, so that the drive shaft moves in the axial direction and the valve opening direction. Accordingly, the engaging part engages with the second engaged part to forcibly open the main valve.   The pilot-type flow control valve according to claim 1, wherein the engagement portion is configured by a ring member that is fitted to the drive shaft and protrudes radially from the drive shaft. apparatus.

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