JP2007024062A5 - - Google Patents

Description

Pilot flow control device

  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. 22 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. 22, 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. 22, 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 channel 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 control device shown in FIG. 22, 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, the pilot valve seat 218 is provided in the same vertical direction as the main valve 204 and the pilot valve 214 in the vertical direction when the vertical direction of the main valve 204 in the figure is the vertical direction. That is, since the seal part of the pilot valve 214 and the seal part of the pilot valve seat 218 provided integrally with the main valve 204 are sealed in the axial direction, When the pilot valve 214 is strongly pressed downward in the drawing, the pilot valve 214 made of an elastic body is crushed and greatly elastically deformed, and this is repeated, resulting in a decrease in the durability of the pilot valve 214, that is, the seal member. There is.

  Further, in order to reliably stop the water, it is necessary to strongly press the pilot valve 214 against the pilot valve seat 218. At this time, a large driving force, that is, an operating force for the pilot valve 214 is required. There is a problem that the advantage of light operation with a small operation force in the valve control device is reduced.

JP-A-4-302790

  The present invention is based on the circumstances as described above, and the operating force at the time of closing the valve, that is, at the time of water stop can be made smaller than before, and the seal member is greatly elastically deformed at the time of water stop. The purpose of the present invention is to provide a pilot-type flow control device that can solve the problem that the durability of the seal member is reduced due to the repetition of the above, and can be operated lightly with a small operating force.

  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 extracting water into the outflow water channel, and (e) relative to a pilot valve seat provided on the side of the main valve by moving forward and backward in the same direction as the main valve. A pilot valve that changes the position and changes the opening of the pilot water channel, and (f) a drive shaft that drives 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 in accordance with the forward / backward movement of the main valve, the pilot valve seat is set sideways with the forward / backward direction of the main valve being the vertical direction. The pilot valve is moved forward and backward in a direction along the lateral pilot valve seat, and the pilot valve seal portion is moved relative to the pilot valve seat seal portion at the forward end of the pilot valve. The pilot valve is closed by contacting it laterally via a seal member provided on the valve seat or the pilot valve, and closing the pilot water channel, while the pilot valve is moved backward to move the seal portion of the pilot valve to the pilot valve. The pilot water channel is opened by being separated from the seal portion of the seat, and the opening of the pilot water channel is changed according to the separation amount. To.

  According to a second aspect of the present invention, in the first aspect, the pilot valve seat is provided in an annular shape around an axis of the main valve or an axis parallel to the main valve, and the pilot valve is located with respect to the pilot valve seat. The seal portion of the pilot valve is provided so as to be relatively movable in the axial direction, and the seal portion of the pilot valve is interposed via the seal member forming an annular shape corresponding to the annular peripheral surface of the pilot valve seat when the valve is closed. Then, the seal portion of the pilot valve seat is brought into contact with the radial direction which is the lateral direction so as to close the pilot water channel.

  According to a third aspect of the present invention, in the second aspect, the main valve is provided with a protrusion that protrudes toward the back pressure chamber, and the pilot valve seat is provided annularly on the protrusion, and the protrusion The pilot valve is fitted so as to be relatively movable.

  According to a fourth aspect of the present invention, in the third aspect, the opening of the pilot water channel that is opened and closed by the pilot valve opens laterally at a position on the receding side of the pilot valve with respect to the seal portion of the lateral pilot valve seat. It is characterized by that.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, between the projecting portion and the pilot valve, there is always watertightness between the projecting portion and the pilot valve at a position on the backward side of the pilot valve with respect to the lateral opening of the pilot water channel. An annular seal member for sealing is interposed.

  According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the labyrinth that seals between the projecting portion and the pilot valve at all times in a non-contact manner at a position on the backward side of the pilot valve with respect to the lateral opening of the pilot water channel. A seal is provided.

  According to a seventh aspect of the present invention, in the third aspect, a gap is formed between a portion of the projecting portion of the pilot valve seat that is closer to the rear side of the pilot valve than the seal portion and the pilot valve. The pilot water channel is formed by a gap.

  According to an eighth aspect of the present invention, in the second aspect, an insertion hole is provided in the main valve, and the pilot valve is fitted into the insertion hole so as to be relatively movable in the advancing / retreating direction, along the inner peripheral surface of the insertion hole. The transverse pilot valve seat is provided in an annular shape, and the seal portion of the pilot valve is brought into contact with the seal portion of the pilot valve seat in the radial direction via the corresponding annular seal member for sealing. It is characterized by that.

  According to a ninth aspect of the present invention, in the eighth aspect, the insertion hole is provided through the main valve, the pilot water passage is provided through the pilot valve, and the back pressure of the pilot water passage is provided. One end of the chamber side is opened sideways on the outer peripheral surface of the pilot valve.

  According to a tenth aspect of the present invention, in the eighth aspect, the insertion hole is provided through the main valve, and the pilot water channel is formed between an inner peripheral surface of the insertion hole and an outer peripheral surface of the pilot valve. The pilot valve seat provided along the inner peripheral surface of the insertion hole or the seal portion of at least one of the outer peripheral surface of the pilot valve is formed in a stepped shape.

  According to an eleventh aspect of the present invention, in any one of the first to tenth aspects, the drive shaft is configured to drive the pilot valve through the main valve from the secondary outflow water channel side. It is characterized by.

  According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, the pilot valve is formed integrally with a tip portion of the drive shaft.

According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects, the drive shaft is for opening the main valve by an engaging action when the drive shaft is moved. An engaging portion is provided.

Effects and effects of the invention

  As described above, according to the present invention, the pilot valve seat is provided laterally with the main valve advance / retreat direction as the vertical direction, the pilot valve is caused to advance / retreat in the direction along the lateral pilot valve seat, and the pilot valve is advanced. At the end, the pilot valve seal part is brought into contact with the seal part of the pilot valve seat laterally through a seal member provided on the pilot valve seat or the pilot valve so as to close the pilot water passage, while the pilot valve is closed. The pilot water passage is opened by separating the pilot valve seal portion from the pilot valve seat seal portion by the backward movement of the valve, and the opening degree of the pilot water passage is changed in accordance with the separation amount.

In the present invention, the seal member is not compressed in the longitudinal direction, which is the forward direction of the pilot valve, to seal when the valve is closed, but the pilot valve contacts the pilot valve seat laterally via the seal member. Therefore, the seal member is not greatly elastically deformed when the valve is closed, and the durability of the seal member can be effectively improved.
In addition, since the seal member is not strongly compressed at the time of sealing, a large operating force is not required at that time, and it can be operated lightly with a small operating force even at the time of water stoppage, and a reliable sealing, that is, water stoppage is performed. Can do.

  In the present invention, the pilot valve seat is annularly provided around the shaft center of the main valve or the shaft center parallel thereto, and the pilot valve is fitted to the pilot valve seat so as to be relatively movable in the shaft center direction. The pilot valve seal part is brought into radial contact with the pilot valve seat seal part via an annular seal member corresponding to the annular peripheral surface of the pilot valve seat when the pilot valve seal is closed, i.e. when the water is stopped. It can be made to close (Claim 2).

In this case, the main valve is provided with a projecting portion projecting toward the back pressure chamber, and a pilot valve seat is annularly provided on the projecting portion, and the pilot valve is fitted to the projecting portion so as to be relatively movable. (Claim 3).
In this case, the forward and backward movement of the pilot valve in the vertical direction can be favorably guided by the protrusion.
Moreover, by doing in this way, the pilot valve seat which makes an annulus easily can be provided.

According to the third aspect of the present invention, the pilot valve can be formed in a cylindrical shape and can be fitted to the protruding portion so as to be relatively movable in an externally fitted state.
In the conventional pilot type flow regulating device shown in FIG. 22, the pressure of the back pressure chamber 208 acts as an upward force on the front end surface (lower end surface in the figure) of the pilot valve 214, and thus the pilot There is a problem that the operation force when closing the valve 214 is increased.
However, when the pilot valve is formed into a cylindrical shape according to the third aspect and is fitted in the projecting portion in an externally fitted state, the pressure in the backward direction from the back pressure chamber to the tip surface of the pilot valve is as much as possible. Thus, the resistance when the pilot valve is closed can be reduced, and the operating force for closing the valve can be further reduced.

  According to the third aspect of the present invention, the projecting portion may be formed in a cylindrical shape, and the pilot valve may be fitted inside the projecting portion so as to be relatively movable in an inner fitting state. It is possible to make the pressure of the back pressure chamber with respect to the surface not substantially act, and the operation force at the time of closing the valve can be further reduced.

  According to the third aspect of the present invention, the opening of the pilot water channel that is opened and closed by the pilot valve is opened laterally at a position on the backward side of the pilot valve with respect to the seal portion of the pilot valve seat that is laterally directed. (Claim 4).

  Next, according to a fifth aspect of the present invention, an annular seal member is provided between the protrusion and the pilot valve at a position on the retreating side of the pilot valve with respect to the lateral opening of the pilot water channel so as to always seal the space therebetween. In this way, it is possible to satisfactorily prevent the water in the back pressure chamber from leaking through the gap between the protrusion and the pilot valve.

On the other hand, a sixth aspect provides a labyrinth seal that seals the projecting portion and the pilot valve in a non-contact manner at a position closer to the pilot valve than the lateral opening of the pilot water channel.
In the case of claim 5 above, the seal member that always seals between the protruding portion and the pilot valve generates sliding resistance during the forward / backward movement of the pilot valve. Since the labyrinth seal that seals without contact is used, the sliding resistance due to the seal member that seals between them can be eliminated when the pilot valve moves forward and backward, and the pilot valve moves forward and backward. It can be done lightly with a smaller force.

Here, the labyrinth seal increases the flow resistance by abrupt expansion and contraction of the water channel, and thereby seals in a non-contact manner. Various forms of the seal are possible.
According to the sixth aspect of the present invention, the dimensional accuracy of the fitting clearance between the projecting portion and the pilot valve can be made somewhat rough, the manufacturing cost can be reduced, and the assembly can be facilitated. It is done.

In the present invention, a gap is formed between the projecting portion of the pilot valve and the pilot valve on the back side of the pilot valve seat and the pilot valve, and the pilot water channel is formed by the gap. (Claim 7).
By doing in this way, a pilot waterway can be formed easily and the structure around the above-mentioned projection and pilot valve can be simplified.

Next, according to the eighth aspect of the present invention, an insertion hole is provided in the main valve, the pilot valve is fitted into the insertion hole so as to be relatively movable in the advancing and retreating direction, and the pilot valve seat that is turned sideways along the inner peripheral surface of the insertion hole The pilot valve seal portion is brought into contact with the seal portion of the pilot valve seat in the radial direction via a corresponding annular seal member, and is sealed.
Even in such a case, it is possible to prevent the seal member from being compressed and elastically deformed in the same direction by the movement of the pilot valve in the valve closing direction, that is, the forward movement, and to prevent the life of the seal member from being shortened by the large compression elastic deformation of the seal member In addition, the valve can be lightly closed with a small operating force when the valve is closed.

Further, in the case of the eighth aspect, there is an advantage that the main valve can be prevented from being tilted by the pilot valve inserted into the insertion hole of the main valve.
According to the eighth aspect, since the pilot valve is inserted into the insertion hole of the main valve, that is, the main valve has a structure for swallowing the pilot valve, the pressure in the backward direction of the back pressure chamber is not substantially applied to the pilot valve. In this way, the operating force when closing the pilot valve can be reduced.

In this eighth aspect, the insertion hole can be provided as a through hole having a shape penetrating the main valve, and in this case, the stroke of the drive shaft can be increased.
In this way, the pilot valve does not hit the main valve even when the drive shaft is moved forward greatly, so the degree of freedom in setting the stroke of the drive shaft's forward / backward movement is increased, and consequently the pilot flow control The degree of freedom in designing the valve device is increased.

  In this eighth aspect, the insertion hole is provided through the main valve, the pilot water channel is provided through the pilot valve, and one end of the pilot water channel on the back pressure chamber side is set laterally on the outer peripheral surface of the pilot valve. It can be opened (claim 9).

Further, according to claim 10, a pilot water passage is formed between the inner peripheral surface of the insertion hole and the outer peripheral surface of the pilot valve, and the pilot valve seat or the outer periphery of the pilot valve provided in an annular shape along the inner peripheral surface of the insertion hole At least one seal part of the surface can be formed in a stepped shape.
In this case, a stepped seal portion provided on one side is elastically contacted with the other via an annular seal member, thereby performing sealing when the valve is closed.

In the present invention, the drive shaft may be provided so as to drive the pilot valve through the main valve from the secondary side outflow water channel side.
In this case, when sealing between the drive shaft and the body of the pilot type flow control device, the seal can be a secondary seal, and the pressure applied to the seal portion can be reduced. it can.

  In the present invention, the pilot valve can be formed integrally with the tip of the drive shaft (claim 12).

In the present invention, the drive shaft can be provided with an engaging portion for forcibly opening the main valve that opens the main valve by an engaging action when the drive shaft moves. ).
  In such a case, by forcibly opening the main valve in a cold region, etc., the main valve is fixed to the main valve seat by freezing while it is seated on the main valve seat, which hinders the subsequent flow control operation. Can solve the problem.

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 back and forth in the vertical direction in the figure (here, the vertical 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 sitting on the main valve seat 22, and the main water passage is opened by separating from the main valve seat 22 upward 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 downward valve closing direction in the figure.

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.

As shown in FIG. 2, the main valve 16 is provided with a projecting portion 30 having a circular cross-section projecting upward in the drawing, that is, in the longitudinal direction toward the back pressure chamber 24, at the center of the main valve 16.
The projecting portion 30 is provided with a pilot valve seat 32 having an annular shape around the axis of the main valve 16 along the outer peripheral surface thereof, and is provided laterally in a direction perpendicular to the axis of the main valve 16.
Reference numeral 34 denotes a seal portion in the pilot valve seat 32, and an O-ring 36 is mounted and held therein as an annular seal ring (seal member).

The pilot water channel 28 passes through the main valve 16 in the vertical direction, that is, in the vertical direction, and a horizontal hole 37 is branched from the middle portion thereof.
The lateral hole 37 forms a part of the pilot water channel 28, and an opening 38 at the tip, that is, one end on the back pressure chamber 24 side, opens laterally on the outer peripheral surface of the pilot valve seat 32.

An annular O-ring 39 as a seal member is mounted and held on the projecting portion 30 at a position above the lateral opening 38 in the drawing, that is, a position on the retreat side of a pilot valve 56 described later.
Here, the O-ring 39 always makes elastic contact with the pilot valve 56 and functions to seal the space between the outer peripheral surface of the protrusion 30 and the inner peripheral surface of the pilot valve 56 in a watertight manner.

In FIG. 1, reference numeral 40 denotes a drive shaft which protrudes upward in the figure from the body 42 and has an assembling part 44 to which a handle or the like is assembled, an annular projecting part 46 projecting radially, and a shaft part extending downward in the figure. 48.
A male screw 50 is provided on the outer peripheral surface of the annular protrusion 46, and the male screw 50 is screwed into a female screw 52 provided on the body 42.
The drive shaft 40 moves back and forth in the vertical direction in the figure, that is, in the vertical direction by the screw feeding action of the male screw 50 and the female screw 52 based on the applied rotational operation force.

On the other hand, the shaft portion 48 is rotatably fitted in a fitting hole 49 provided in the body 42.
An annular groove is formed on the outer peripheral surface of the shaft portion 48, and an annular O-ring 54 as a seal member is mounted and held on the shaft portion 48, and the space between the shaft portion 48 and the body 42 is secured by the O-ring 54. It is sealed watertight.

A cylindrical pilot valve 56 is integrally formed at the lower end portion (tip portion) of the drive shaft 40, specifically the shaft portion 48, and the pilot valve 56 is externally fitted to the projecting portion 30. It is fitted so as to be relatively movable in the vertical direction in the figure.
58 is a seal portion of the pilot valve 56 having a cylindrical shape, and the seal portion 58 is formed integrally with the projecting portion 30 via the O-ring 36 at the forward end of the pilot valve 56. The seal portion 34 is elastically contacted in the radial direction, and the pilot water channel 28 is closed.
Then, the main valve 16 is closed under the closed state of the pilot valve 56, and the main water channel is blocked.

In the present embodiment, the outer diameter of the shaft portion 48 in the drive shaft 40 and the outer diameter of the pilot valve 56 are the same outer diameter.
Specifically, the outer diameter of the portion sealed by the O-ring 54 with respect to the body 42 of the shaft portion 48 and the outer diameter of the pilot valve 56 are the same outer diameter.

The pressure in the back pressure chamber 24 acts on the lower end surface of the pilot valve 56 upward in the figure, that is, in the backward direction of the drive shaft 40. However, the thickness of the cylindrical pilot valve 56 is thin. The upward force in the figure based on the pressure of the back pressure chamber 24 with respect to the pilot valve 56 and the drive shaft 40 is very slight.
That is, in the present embodiment, the pressure of the back pressure chamber 24 with respect to the pilot valve 56 and the drive shaft 40 is extremely small so as to be substantially negligible.

  In the present embodiment, the pilot valve 56 driven in the vertical direction, that is, the vertical direction in the drawing by the drive shaft 40 moves forward and backward in the direction along the annular pilot valve seat 32 that is outward in the radial direction, that is, laterally. At the forward end, the seal portion 58 of the pilot valve 56 elastically contacts the seal portion 34 of the pilot valve seat 32 in the lateral or radial direction via the O-ring 36 to close the pilot water passage 28. That is, the water is stopped.

Further, the pilot valve 56 retreats upward (longitudinal direction) from the water stop position, that is, the valve closing position, so that the seal portion 58 of the pilot valve 56 is removed from the O-ring 36 attached to the pilot valve seat 32. The pilot water channel 28 (specifically, the lateral opening 38) is opened apart from the middle and upward, and the opening degree of the pilot water channel 28 is changed according to the distance.
As a result, the main valve 16 is moved up and down in the vertical direction in the figure to change the opening of the main water channel and adjust the flow rate of the main water channel.

3 and 4 specifically show the action at that time.
FIG. 2 shows the valve closed state, that is, the state when the water is stopped. From this state, when the pilot valve 56 is moved backward as shown in FIG. The opening 38, that is, the pilot water channel 28 is opened, and water in the back pressure chamber 24 is extracted through the pilot water channel 28 to the secondary outlet water channel 14.
Then, the pressure in the back pressure chamber 24 decreases, and the pressure in the primary inflow water channel 12 overcomes this, and as shown in FIG. 3 (II), the main valve 16 is pushed upward in the figure. .

Then, when the main valve 16 is pushed up, the opening of the pilot water channel 28 is narrowed, the amount of water extracted from the back pressure chamber 24 to the outflow water channel 14 is reduced, and the pressure in the back pressure chamber 24 and the inflow water channel 12 are reduced. The main valve 16 is stopped at a position where the pressure is just balanced.
Thus, when the main valve 16 is pushed upward in the figure, 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. That is, water flows in the main channel.

  In this state, when the pilot valve 56 is further moved backward in the drawing as shown in FIG. 3 (III), the main pressure is adjusted so that the pressure in the back pressure chamber 24 and the pressure in the inflow water channel 12 are balanced in the same manner. The valve 16 moves backward in the figure following the backward movement of the pilot valve 56, and the flow rate of water is increased by changing the opening of the main water channel more widely.

On the other hand, when the pilot valve 56 is moved forward in this state downward as shown in FIG. 4 (I) from this state, the opening of the pilot water channel 28 is narrowed, so that the main valve 16 has a pressure in the back pressure chamber 24. As shown in FIG. 4 (II), the forward movement is made downward in the figure so as to balance with the pressure of the inflow water channel 12, and the opening of the main water channel is narrowly changed.
Finally, as shown in FIG. 4 (III), when the seal portion 58 of the pilot valve 56 comes into contact with the seal portion 34 of the pilot valve seat 32 in the radial direction via the O-ring 36 and is in a sealed state. That is, when the pilot valve 56 is in a closed state, the main valve 16 is seated on the main valve seat 22 and is closed to shut off the main water passage and stop water flow (see FIG. 2).

The pilot flow regulating device 10 of the present embodiment as described above does not compress the O-ring 36 in the longitudinal direction, which is the forward direction of the pilot valve 56, and does not perform sealing when the valve is closed. Since sealing is performed by contacting the pilot valve seat 32 laterally via the O-ring 36, the O-ring 36 is not greatly elastically deformed when the valve is closed. The durability of the O-ring 36 can be effectively improved.
Further, since the O-ring 36 is not strongly compressed at the time of sealing, it does not require a large operating force at that time, and can be operated lightly with a small operating force even at the time of water stoppage, and a reliable seal, that is, water stop is performed. be able to.

In the present embodiment, the pilot valve 56 is formed in a cylindrical shape, and is fitted to the protruding portion 30 so as to be relatively movable in an externally fitted state. The pressure in the backward direction from 24 can be reduced as much as possible, thereby reducing the resistance when the pilot valve 56 is closed, and the operation force for closing the valve can be further reduced.
Further, the protrusion 30 can guide the movement of the pilot valve 56 in the vertical direction favorably.

  Furthermore, according to the present embodiment, the O-ring 39 is interposed between the projecting portion 30 and the pilot valve 56 at a position above the lateral opening 38 of the pilot water channel 28 in the drawing, that is, at a position on the backward side of the pilot valve 56. Since the projection 30 and the pilot valve 56 are always sealed in a watertight manner, the water in the back pressure chamber 24 is leaked through the gap between the projection 30 and the pilot valve 56. It can prevent well.

In the above-described embodiment, the pilot valve 56 configured integrally with the distal end portion of the drive shaft 40 is fitted into the protruding portion 30 on the main valve 16 side in an externally fitted state, but is shown in FIG. Thus, the projecting portion 30 is formed in a cylindrical shape, and the opening 38 of the lateral hole 37 that forms a part of the pilot water channel 28 is opened laterally on the inner peripheral surface thereof, and the projecting portion 30 that forms the tubular shape is opened. The pilot valve 56 configured integrally with the distal end portion of the drive shaft 40 may be fitted in an internally fitted state so as to be relatively movable in the vertical direction in the drawing.
In this way, the action of the pressure of the back pressure chamber 24 on the pilot valve 56 or the front end surface (lower end surface in the figure) of the drive shaft 40 can be eliminated, and the operation force when operating the drive shaft 40 can be further increased. An advantage that can be reduced is obtained.

FIG. 6 shows still another embodiment of the present invention.
In this example, a labyrinth seal that performs non-contact sealing instead of the O-ring 39 in the above embodiment is used.
In the figure, reference numeral 60 denotes a labyrinth seal provided on the protruding portion 30 side.
As shown in the drawing, here, a plurality of annular recesses 62 provided at a predetermined pitch in the axial direction along the outer peripheral surface of the projection 30, and an annular projection protruding outward in the radial direction between the annular recesses 62 and 62. A labyrinth seal 60 is constituted by 64.

The labyrinth seal 60 extends from a narrow passage 66 formed between the annular protrusion 64 and the pilot valve 56 to an enlarged passage 68 formed between the annular recess 62 and the pilot valve 56 and further from the enlarged passage 68 again. By changing the passage width to the narrow passage 66, a flow resistance is generated there, and a non-contact seal is performed between the projecting portion 30 and the pilot valve 56 based on the flow resistance.
The other points are the same as in the embodiment of FIGS.

In the embodiment shown in FIG. 6, since the protrusion 30 and the pilot valve 56 are always sealed with a labyrinth seal 60 as a non-contact seal, when the pilot valve 56 moves forward and backward, The sliding resistance due to the seal member sealing between them can be eliminated, and the pilot valve 56 can be moved forward and backward with a small force.
In this embodiment, the dimensional accuracy of the fitting clearance between the projecting portion 30 and the pilot valve 56 can be made rough to some extent, the manufacturing cost can be reduced, and the assembly can be easily performed. .

FIG. 7 shows still another embodiment of the present invention.
In this example, the O-ring 36 provided in the seal portion 34 of the pilot valve seat 32 is located between the outer peripheral surface of the projecting portion 30 and the pilot valve 56 at a position on the upper side in the drawing, that is, on the backward side of the pilot valve 56. In this example, a narrow gap (annular gap here) 72 is formed, and this gap 72 is configured as a part of the pilot water channel 28.

In this embodiment, at the forward end of the pilot valve 56, the seal portion 58 elastically contacts with the seal portion 34 of the pilot valve seat 32 in the radial direction via the O-ring 36 to seal the pilot valve 56. A valve or water stop is performed.
Further, when the seal portion 58 of the pilot valve 56 is separated upward from the O-ring 36 in the figure, the gap 72 is opened, that is, the pilot water passage 28 is opened and water is passed, and the pilot is selected according to the amount of separation. The opening degree of the water channel 28 is changed, and the flow rate of the water flowing through the main water channel is changed according to the change.
According to the embodiment shown in FIG. 7, the pilot water channel 28 can be easily formed, and the structure around the protrusion 30 and the pilot valve 56 can be simplified.

8 and 9 show still another embodiment of the present invention.
In these drawings, reference numeral 74 denotes an insertion hole provided in a form penetrating the central portion of the main valve 16 in the vertical direction, that is, in the vertical direction, and a pilot valve seat having an annular shape along the inner peripheral surface of the insertion hole 74. 76 is integrally provided on the main valve 16 inwardly in the radial direction, that is, laterally.
Reference numeral 78 denotes a seal portion in the pilot valve seat 76, and an O-ring 80 serving as an annular seal member is mounted and held therein.

Reference numeral 82 denotes a pilot valve that is formed integrally with the tip end of the shaft portion 48 of the drive shaft 40. In this embodiment, the pilot valve 82 is inserted into the insertion hole 74 of the main valve 16.
As shown in FIG. 9, the pilot valve 82 is provided with a vertical hole 84 and a horizontal hole 86 communicating with the vertical hole 84, and the pilot water channel 28 is constituted by them.
Here, the lateral hole 86 opens laterally on the outer peripheral surface of the pilot valve 82.

  Reference numeral 88 denotes a seal portion in the pilot valve 82, and the pilot valve 82 has an outer peripheral surface of the seal portion 88 at an inner peripheral surface of the O-ring 80 at the forward-facing end in the drawing, that is, through the O-ring 80. The seal portion 78 of the seat 76 is elastically contacted radially outward to close the pilot water channel 28 (see FIG. 9A).

In this embodiment, as shown in FIG. 8, the shaft portion 48 has the same outer diameter from the base end to the tip end constituting the pilot valve 82, and the pilot valve 82 constituted by the tip end portion thereof. Is inserted into the insertion hole 74 of the main valve 16, that is, has a structure in which the seal diameter of the O-ring 54 and the shaft portion 48 and the seal diameter of the O-ring 80 and the pilot valve 82 are the same. Has been.
Accordingly, no upward force in the figure based on the pressure in the back pressure chamber 24 is generated with respect to the shaft portion 48 and the pilot valve 82.
That is, when the shaft portion 48 and the pilot valve 82 are moved forward in the drawing downward, a resistance force due to the pressure in the back pressure chamber 24 does not occur.

In the case of this embodiment, when the pilot valve 82 is retreated upward in the figure from the closed state shown in FIG. 9A, the pilot water channel 28 is moved back through the lateral hole 86 as shown in FIG. 9B. In this state, the water in the back pressure chamber 24 is extracted to the outflow water channel 14 through the pilot water channel 28.
As a result, the pressure of the back pressure chamber 24 and the pressure of the inflow water channel 12 are balanced, and the main valve 16 moves backward upward in the figure to move away from the main valve seat 22 to generate a flow of water in the main water channel. .
The subsequent operation is basically the same as described above.

In the embodiment shown in FIGS. 8 and 9 as well, it is possible to prevent the O-ring 80 from being compressed and elastically deformed in the same direction due to the movement of the pilot valve 82 in the valve closing direction, that is, the forward movement. The lifetime can be prevented from being shortened due to elastic deformation, and the valve can be lightly closed with a small operating force when the valve is closed.
In addition, the pilot valve 82 inserted into the insertion hole 74 of the main valve 16 has an advantage that the main valve 16 can be prevented from tilting.
Further, since the pilot valve 82 is inserted into the insertion hole 74 of the main valve 16, that is, the main valve 16 has a structure for swallowing the pilot valve 82, the pressure in the backward pressure chamber 24 with respect to the pilot valve 82 is substantially reduced. Therefore, the operation force when the pilot valve 82 is closed can be reduced.

In this embodiment, since the insertion hole 74 forms a through hole that penetrates the main valve 16, a large stroke of the drive shaft 40 can be taken.
For example, in the case of the first embodiment shown in FIGS. 1 to 4, when the drive shaft 40 largely moves forward, the pilot valve 56 hits the main valve 16.
Therefore, in this case, the stroke of the forward / backward movement of the drive shaft 40 must be set so that the pilot valve 56 does not hit the main valve 16 during the water stop operation.
However, in this embodiment, since there is no fear of this, the stroke of the drive shaft 40 can be increased, the degree of freedom in setting the movement stroke of the drive shaft 40 is increased, and the degree of freedom in design of the pilot-type flow control device 10 is consequently increased. Will increase.

FIG. 10 shows still another embodiment of the present invention.
In the figure, reference numeral 90 denotes a pilot valve integrally formed at the tip of the shaft portion 48, and 92 denotes a seal portion of the pilot valve 90.
The pilot valve 90 elastically contacts the outer peripheral surface of the seal portion 92 in the radial direction with the inner peripheral surface of the O-ring 80 on the pilot valve seat 76 side at the forward end.
In other words, the pilot water passage 28 is closed by elastically contacting the seal portion 78 of the pilot valve seat 76 in the radial direction via the O-ring 80.

In this embodiment, an annular pilot water passage 28 having a narrow water passage width is formed between the pilot valve 90 and the insertion hole 74 penetrating the main valve 16.
The pilot valve 90 is provided with an annular recess 94.
Each end portion in the axial direction of the annular recess 94 is a tapered surface 96 that gradually becomes smaller in diameter toward the smallest diameter portion of the recess 94, and the end on the large diameter side of the tapered surface 96 is radially outward. Oriented stepped portions 98 and 100 are formed.

In this embodiment, when the pilot valve 90 retreats upward in the drawing from the closed state shown in FIG. 10A, the seal portion 92 moves away from the O-ring 80 as shown in FIG. A gap is created between the valve 90 and the O-ring 80, where the pilot water channel 28 communicates with the back pressure chamber 24.
Here, the water in the back pressure chamber 24 is extracted to the outflow water channel 14 through the pilot water channel 28, and the pressure in the back pressure chamber 24 decreases.
Therefore, the main valve 16 retreats upward so as to follow the upward retreat movement of the pilot valve 90 in the figure, and creates a gap between the main valve seat 22 and the water flow in the main water channel.
Further, the flow rate of water at that time is controlled in accordance with the backward movement amount of the pilot valve 90.

On the other hand, when the pilot valve 90 moves forward downward in the figure, the main valve 16 moves forward toward the main valve seat 22 following this, and the opening of the main water passage is changed small.
Finally, when the pilot valve 90 is in the closed state shown in FIG. 10A, the main valve 16 is closed, and the flow of water in the main water channel is stopped.

As shown in FIG. 11, a plurality of ribs 95 can be provided at predetermined intervals in the circumferential direction in the portion where the recess 94 is provided.
When such a rib 95 is provided, the O-ring 80 enters the recess 94 as the pilot valve 90 moves forward and backward, and the stepped portion 98 hits the O-ring 80 to generate resistance there. The advantage of not causing a problem such as

FIG. 12 is an example in which a plurality of ribs 75 in the vertical direction (vertical direction in the figure) are provided at predetermined intervals in the circumferential direction along the inner peripheral surface of the through hole 74 in the main valve 16.
In this case, the rib 75 serves as a guide for the pilot valve 90, and the tilt of the pilot valve 90, that is, the drive shaft 40, can be prevented more favorably, and the seal state when the valve is closed can be further improved.

13 and 14 show still another embodiment of the present invention.
In this example, the drive shaft 40 penetrates the main valve 16 from the side of the secondary side outflow water passage 14 and drives the pilot valve 90 integrally formed at the tip of the drive shaft 40.
In this embodiment, as shown in FIG. 14, the configurations of the pilot valve 90 and the pilot valve seat 76 are basically the same as those shown in FIG.
However, in this embodiment, the direction of movement of the main valve 16 and the pilot valve 90 during the valve closing operation and the valve opening operation is opposite to that shown in FIG.

In this embodiment, as shown in FIG. 13, the shaft portion 48 of the drive shaft 40 includes a small-diameter portion 48 a on the distal end side and a medium-diameter portion 48 b that is slidably fitted to the body 42. The middle diameter portion 48 b is sealed in a watertight manner with respect to the body 42 by an O-ring 54.
In this embodiment, the seal by the O-ring 54 between the drive shaft 40 and the body 42 is a seal on the secondary side in the main water channel.
Therefore, the pressure applied to the seal portion by the O-ring 54 is small, and therefore the seal structure by the O-ring 54 does not need to have a higher pressure resistance than the seal on the primary side.
In this embodiment, the pilot valve 90 and the pilot valve seat 76 may be configured in the form shown in FIGS. 8 and 9 or in other forms.

15 and 16 show still another embodiment of the present invention.
In this example, a check valve 102 for draining water from the back pressure chamber 24 is incorporated in the main valve 16.
Here, the check valve 102 has a substantially wedge shape, and the male tapered surface 104 (see a partially enlarged view in FIG. 16A) is normally the female tapered surface 106 of the main valve 16 (in FIG. 16A). The water flow from the back pressure chamber 24 to the outflow water channel 14 is blocked (except for the water flow from the pilot water channel 28).

On the other hand, a fitting groove 108 is provided at the distal end portion (lower end portion in the figure) of the drive shaft 40, and an engagement member 110 for forcibly opening the check valve 102 and the main valve 16 is fitted therein. Yes.
Here, the engaging member 110 has a ring shape. The first engaging portion 112 that contacts and engages only with the check valve 102 on the upper side in the drawing, and the main valve 16 on the lower side, more specifically, the check member. A second engaging portion 114 is provided that contacts and engages with a portion surrounding the lower end of the valve 102.

  In this embodiment as well, the pilot valve 90 and the pilot valve seat 76 of the same type as shown in FIG. 10 and further shown in FIGS. 13 and 14 are formed integrally with the tip of the drive shaft 40 and the main valve 16, respectively. Yes.

In the case of this embodiment, when the drive shaft 40 is lifted upward in the figure with the main valve 16 seated on the main valve seat 22, that is, in the valve-closed state, as shown in FIG. 110 is engaged with the check valve 102, and the check valve 102 is forcibly lifted in accordance with the upward movement of the drive shaft 40 in the figure. Water is extracted into the outflow channel 14.
Thereafter, when the drive shaft 40 is further lifted upward in the drawing, the large-diameter second engagement portion 114 on the lower side of the engagement member 110 is engaged with the main valve 16 as shown in FIG. Thus, the entire main valve 16 is lifted upward in the drawing, and the main valve 16 is forcibly separated from the main valve seat 22 upward.
Incidentally, a groove 115 is provided on the lower surface of the main valve 16 in the figure, and the water extracted from the back pressure chamber 24 is satisfactorily discharged through the groove 115 regardless of the presence of the engaging member 110. Discharged to the side.

  In this embodiment, when draining water in a cold region or the like, the water in the back pressure chamber 24 can be satisfactorily drained by opening the check valve 102, and the main valve 16 is forcibly opened. As a result, it is possible to satisfactorily solve the problem that the main valve 16 is fixed to the main valve seat 22 by freezing while the main valve 16 is seated on the main valve seat 22, and the flow rate adjusting operation is hindered thereafter.

Next, FIG. 17 shows still another embodiment of the present invention.
This example is also an example in which the main valve 16 is forcibly opened by moving the drive shaft 40 upward in the drawing when draining water in a cold district or the like.
In this embodiment, instead of the O-ring 80 shown in FIGS. 8 to 16, an elastic seal member 116 having a small diameter on the lower end side and a large diameter on the upper end side is used, and the lower end of the drive shaft 40 is used. An engaging portion 118 is provided in the portion, and when the drive shaft 40 moves upward in the figure, the engaging portion 118 engages with the seal member 116, and the main valve 16 is moved via the seal member 116. It is forcibly moved upward in the figure and is forcibly separated from the main valve seat 22.

18 to 20 show application examples of the pilot-type flow control device 10 to a faucet.
In this example, the drive shaft 40 is divided into two in the axial direction (vertical direction) into an upper shaft 40A on the handle 122 side and a lower shaft 40B on the main valve 16 side.
The upper shaft 40A is provided with a serration portion on the outer peripheral surface of the upper end portion, and this serration portion is screwed to the handle 122 via a serration ring 120 having an inner peripheral surface and an outer peripheral surface, respectively. The upper shaft 40A meshes with the serration portion on the inner peripheral surface of the fixed serration member 124, and the upper shaft 40A rotates integrally with the handle 122.

The upper shaft 40A is also fixed in the axial direction to the serration member 124 by a fixing screw 126.
The upper shaft 40 </ b> A has a cylindrical portion 128 having an inverted cup shape at the lower portion, and the cylindrical portion 128 is rotatably held inside a cylindrical housing portion 130 formed integrally with the body 42. .
A female thread 132 is formed on the inner peripheral surface of the cylindrical portion 128 as shown in FIG.

On the other hand, the lower shaft 40B has a protruding portion 134 protruding in the radial direction at the upper portion.
A male screw 136 is formed on the outer peripheral surface of the projecting portion 134, and the male screw 136 is screwed to a female screw 132 on the inner peripheral surface of the cylindrical portion 128 of the upper shaft 40 </ b> A. Due to the rotational driving force applied to 40A, the lower shaft 40B moves forward and backward in the vertical direction in the figure by the screw feed action of the male screw 136 and the female screw 132.

As shown in FIG. 20, the projecting portion 134 is formed with flat engagement surfaces 138 that are parallel to each other, and the pair of engagement surfaces 138 are clamped by the pair of clamping pieces 140. Due to the rotation stopping action by the clamping piece 140, the lower shaft 40B is moved forward and backward by screw feed in the vertical direction in the drawing as the upper shaft 40A rotates.
In this embodiment, the handle 122 and the upper shaft 40A integral with the handle 122 do not move up and down by the rotation of the handle 122, but move the lower shaft 40B forward and backward in the vertical direction in the figure by rotating itself while being fixed in the same direction. .

In this embodiment, the configuration of the pilot type flow control device 10 is basically the same as that of the embodiment shown in FIG. 10, and when the handle 122 is rotated in the valve opening direction, the pilot valve 90 opens upward in the figure. In addition, the main valve 16 is opened so as to follow this, water is circulated from the inflow water channel 12 to the outflow water channel 14, and water is discharged from the water outlet at the tip of the water discharge pipe 142.
On the other hand, when the handle 122 is rotated in the valve closing direction, the pilot valve 90 and the main valve 16 are closed, and water discharge from the water discharge port stops.

  In this embodiment, an engaging member 144 made of an elastic ring (here, an E-ring (see FIG. 20)) is provided at the drive shaft 40, more specifically at the tip (lower end) of the shaft 48, and the drive shaft When 40 is pulled upward in the figure, the engaging member 144 engages with the main valve 16 to forcibly lift the main valve 16 away from the main valve seat 22.

FIG. 21 shows still another embodiment of the present invention.
In this example, the O-rings 39 and 80 are held on the lower shaft 40B side in the embodiment of FIGS. 18 to 20, and the O-ring 39 is elastically brought into contact with the inner peripheral surface of the fitting hole 49 of the body 42 for sealing. In addition, the O-ring 80 is elastically brought into contact with the seal portion 78 of the pilot valve seat 76 integrally formed with the main valve 16 so as to form a seal when the valve is closed.
Other points are the same as those of the embodiment shown in FIGS.

  Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention can be configured in various modifications without departing from the spirit of the present invention.

It is a figure which shows the pilot type flow regulating apparatus which is one Embodiment of this invention. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the effect | action at the time of valve opening of the embodiment. It is explanatory drawing which shows the effect | action at the time of valve closing of the embodiment. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows the state at the time of valve closing of the embodiment shown in FIG. It is a figure which shows other embodiment of this invention. It is a figure which shows the principal part of other embodiment of this invention. It is a figure which shows the principal part of other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows the state at the time of valve closing of the embodiment shown in FIG. It is a figure which shows other embodiment of this invention. FIG. 16 is an operation explanatory diagram of the embodiment shown in FIG. 15. It is a figure which shows other embodiment of this invention. It is a figure which shows the example which applied the pilot type flow control apparatus of this invention to the water tap. It is a principal part enlarged view of FIG. FIG. 19 is a partially exploded perspective view of FIG. 18. It is a figure which shows other embodiment of this invention. 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 Inflow water channel 14 Outflow water channel 16 Main valve 22 Main valve seat 24 Back pressure chamber 26 Introduction small hole 28 Pilot water channel 30 Protruding part 32,76 Pilot valve seat 34,58,78,88,92 Seal Part 36, 39, 80 O-ring (seal member)
37, 86 Horizontal hole 38 Opening 40 Drive shaft 56, 82, 90 Pilot valve 60 Labyrinth seal 72 Gap 74 Insertion hole 98, 100 Stepped portion 116 Seal member

Claims (13)

(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 on the main valve side, and to change an opening degree of the pilot water channel;
(F) 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 the forward and backward movement of the pilot valve;
The pilot valve seat is provided laterally with the main valve advancing / retreating as the vertical direction, and the pilot valve is moved forward and backward along the lateral pilot valve seat, and the pilot valve is advanced at the forward end of the pilot valve. While the valve seal portion is brought into contact with the seal portion of the pilot valve seat in a lateral direction via the pilot valve seat or a seal member provided in the pilot valve to close the pilot water passage, By opening the pilot valve backward, the pilot valve seal is separated from the pilot valve seat seal, thereby opening the pilot water channel and changing the opening of the pilot water channel according to the distance. A pilot-type flow control device.   2. The pilot valve seat according to claim 1, wherein the pilot valve seat is annularly provided around an axis of the main valve or an axis parallel to the axis, and the pilot valve is movable relative to the pilot valve seat in the axial direction. And the seal portion of the pilot valve seat is connected to the pilot valve seat via the seal member that forms an annular shape corresponding to the annular peripheral surface of the pilot valve seat when the valve is closed. A pilot-type flow control device that contacts a seal portion in a radial direction, which is the lateral direction, and closes the pilot water channel.   3. The main valve according to claim 2, wherein the main valve is provided with a protrusion that protrudes toward the back pressure chamber, the pilot valve seat is provided in an annular shape at the protrusion, and the pilot valve A pilot-type flow regulating device characterized by being fitted so as to be relatively movable.   The opening of the pilot water channel opened and closed by the pilot valve according to claim 3, wherein the opening of the pilot valve is laterally opened at a position on the receding side of the pilot valve with respect to the seal portion of the lateral pilot valve seat. Pilot type flow control device.   The annular seal member according to claim 4, wherein the pilot valve is always watertightly sealed between the projecting portion and the pilot valve at a position on the backward side of the pilot valve with respect to the lateral opening of the pilot water channel. Is a pilot-type flow control device.   In Claim 4, the labyrinth seal which seals between the above-mentioned projection part and this pilot valve always without contact in the position of the retreat side of the pilot valve rather than the sideways opening of the pilot water channel is provided. A pilot-type flow control device.   In Claim 3, a gap is formed between a portion of the pilot valve in the pilot valve seat, which is closer to the retreat side of the pilot valve than the seal portion, and the pilot valve, and the pilot water channel is formed in the gap. A pilot-type flow regulating device, which is formed.   3. The pilot valve seat according to claim 2, wherein an insertion hole is provided in the main valve, and the pilot valve is fitted into the insertion hole so as to be relatively movable in an advancing and retreating direction, and the lateral direction is formed along an inner peripheral surface of the insertion hole. And the seal portion of the pilot valve is brought into contact with the seal portion of the pilot valve seat in the radial direction through the corresponding annular seal member for sealing. Pilot type flow control device.   9. The insertion hole according to claim 8, wherein the insertion hole is provided through the main valve, the pilot water channel is provided through the pilot valve, and one end of the pilot water channel on the back pressure chamber side is disposed on the pilot valve. A pilot-type flow control device characterized in that it opens laterally on the outer peripheral surface of the valve.   9. The insertion hole according to claim 8, wherein the insertion hole is provided through the main valve, and the pilot water channel is formed between an inner peripheral surface of the insertion hole and an outer peripheral surface of the pilot valve. A pilot-type flow regulating device characterized in that the pilot valve seat provided along the inner peripheral surface of the pilot valve or the seal portion of at least one of the outer peripheral surface of the pilot valve is formed in a stepped shape.   The pilot-type flow according to any one of claims 1 to 10, wherein the drive shaft is configured to drive the pilot valve through the main valve from the secondary effluent water channel side. Valve regulating device.   The pilot-type flow control device according to claim 1, wherein the pilot valve is formed integrally with a tip portion of the drive shaft. 13. The engaging portion for forcibly opening the main valve is provided on the drive shaft, the main valve being opened by an engaging action when the drive shaft is moved. A pilot-type flow control device.