JP4633489B2 - Lightly operated faucet - Google Patents

Description

  The present invention relates to a faucet, and more particularly to a light operation faucet that incorporates a pilot-type flow control valve mechanism and 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 separating direction with respect to the valve seat, There was a problem that operation was heavy.
Therefore, as a means to lighten the operation of the faucet, the main valve is moved forward and backward by moving the faucet with a pilot-type flow control mechanism, i.e., moving the pilot valve back and forth, thereby changing the opening of the main water passage. It is conceivable to use a faucet with a built-in pilot flow control valve mechanism.

For example, the following Patent Document 1 discloses the configuration of this kind of pilot type flow regulating mechanism. FIG. 9 shows a specific example.
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 a water guide hole 210 that is a small hole 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 water guide hole 210 guides water from the inflow water channel 200 to the back pressure chamber 208 and increases the pressure in 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.

A pilot valve 214 is provided on the drive shaft (drive member) 216 in an integral motion state. This 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, the main valve 204 is advanced or retracted. By moving forward and backward in the same direction as the direction, the opening degree of the pilot water channel 212 (opening degree with respect to the back pressure chamber 208) is changed.
In FIG. 9, 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 mechanism shown in FIG. 9, 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 becomes large, and the opening of the pilot water channel 212 becomes large. Here, the back pressure chamber 208 passes through the pilot water channel 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 mechanism shown in FIG. 9, 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 is controlled by advancing and retracting movement, the main valve 204 can be operated with a small force, and the flow rate can be adjusted with a light operation.

  However, in the case of this pilot-type flow control mechanism, the water guide hole 210 is offset from the center of the main valve 204 and the momentum of the water flowing through the inflow water channel 200 is not necessarily the entire surface of the main valve 204. The main valve 204 does not necessarily move forward and backward in the state in the state in which the main valve 204 is maintained in a vertical posture with respect to the main valve seat 206 due to various reasons such as the fact that the main valve 204 does not work evenly. May end up.

In this pilot-type flow control mechanism, a predetermined clearance is created between the main valve 204, more specifically, the pilot valve seat 218 and the pilot valve 214, while the pilot valve 214 moves in a downward direction in the drawing, that is, moves in the forward direction. The main valve 204 follows and moves forward, and the gap between the pilot valve 214 and the main valve 204 at that time is a very small gap of about 0.02 to 0.05 mm, for example. If tilted, the pilot valve 214 will come into contact with the main valve 204, causing a problem that the operation becomes heavy.
If the pilot valve 214 comes into contact with the main valve 204, specifically, the pilot valve seat 218, even if the pilot valve 214 moves forward downward in the figure, the pilot valve 214 and the main valve 204 As a result, the pressure in the back pressure chamber 208 does not increase with the downward movement of the pilot valve 214, so that the pilot valve 214, more specifically, the drive shaft 216 directly connects the main valve 204. Pushing downward increases the operating load and makes the operation heavier.

Therefore, for example, when the drive shaft 216 is driven using a small actuator such as a stepping motor, there may be a problem that the pilot valve 214 and the main valve 204 are stopped during the valve closing operation due to insufficient driving force. .
This problem is likely to occur when the main valve 204 is made up of a diaphragm valve, because the diaphragm valve is particularly easy to tilt. However, even when the main valve is made up of a piston valve, it is tilted. In this case, the same problem as described above occurs.

JP-A-4-302790

  In the light operation faucet incorporating the pilot type flow control mechanism, the present invention solves the problem that the operation becomes heavy due to the inclination of the main valve, and the light operation that can always be performed lightly. The purpose is to provide an operation faucet.

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) internal pressure is applied to the main valve. A back pressure chamber that acts as a pressing force in the valve closing direction; and (c) a water introduction hole that guides water in the primary inflow water channel in the main water channel to the back pressure chamber and increases the pressure in the back pressure chamber. (D) provided through the main valve in a state where the back pressure chamber communicates with the secondary outflow water channel in the main water channel, and draws water from the back pressure chamber into the outflow water channel. A pilot water passage that reduces the pressure in the back pressure chamber, and (e) a pilot valve that moves back and forth in the approaching and separating direction with respect to the pilot valve seat provided in the main valve to change the opening of the pilot water passage. A pyrometer that adjusts the flow rate in the main channel by moving the main valve forward and backward following the forward and backward movement of the pilot valve. In a lightly operated water faucet with a built-in flow control valve mechanism, the pilot valve is separated from a drive member that drives the pilot valve and is provided on the main valve side. A pilot valve guide for guiding the advancing and retreating movement, the pilot valve being held by the main valve so as to be capable of advancing and retreating under the guidance of the pilot valve guide with respect to the main valve ; and the driving member, the pilot valve, In a state in which the drive member is vertically contacted with the pilot valve, a part of the surface of the drive member facing the pilot valve is partially contacted with the pilot valve. A gap that allows a relative inclination between the pilot valve and the drive member is formed between the opposing surface and the pilot valve around the portion .

  According to a second aspect of the present invention, the urging means for urging the pilot valve in the backward direction is provided in the first aspect, and the pilot valve is urged in the backward direction by the urging means and in the forward direction by the driving member. It is characterized in that it can be moved forward and backward by driving.

According to a third aspect of the present invention, in any one of the first and second aspects, the main valve is a diaphragm valve .

Effects and effects of the invention

  As described above, according to the present invention, the pilot valve is separated from the driving member for driving the pilot valve and provided on the main valve side, and the main valve is provided with the pilot valve guide for guiding the forward / backward movement of the pilot valve. The pilot valve is held by the valve so as to be movable back and forth with respect to the main valve.

  According to the present invention, even if the main valve is tilted without being maintained in the correct vertical position with respect to the main valve seat, the pilot valve held by the main valve is tilted together with the main valve, and this Since the pilot valve moves forward and backward under the guidance of the pilot valve guide provided on the main valve, the pilot valve that is driven by the drive member maintains the correct vertical posture with respect to the pilot valve seat despite the inclination of the main valve. An approaching motion (forward motion) can be made with respect to the pilot valve seat.

  In other words, it is possible to avoid the problem that the pilot valve hits one side against the pilot valve seat provided on the main valve and the clearance between the pilot valve seat and the pilot valve does not become small despite the further forward movement of the pilot valve. The pilot valve can be moved forward with respect to the pilot valve seat, i.e., the main valve, while the gap between the pilot valve and the pilot valve seat is uniformly maintained over the entire circumference. It is possible to solve the problem that the operation becomes heavier due to a single contact with the valve.

In the present invention, biasing means for biasing the pilot valve in the backward direction is provided, and the pilot valve is moved forward and backward by biasing in the backward direction by the biasing means and driving in the forward direction by the drive member. (Claim 2).
By doing so, the pilot valve can be smoothly opened and closed, that is, moved forward and backward with respect to the pilot valve seat.
Here, the biasing means can be provided in the main valve.
Further, it is preferable that the urging force by the urging means is a urging force that is weaker than the force required when the main valve is directly pressed by the drive member.

  In the present invention, the main valve can be constituted by a diaphragm valve.

As another solution to the above, a guide hole extending in the main valve's forward / backward direction is provided on one of the main valve and the drive member, and a guide protrusion inserted into the guide hole is provided on the other side. The main valve guide for moving the main valve in the forward / backward direction can be configured by the hole and the guide protrusion, and in this way, the inclination of the main valve itself can be effectively prevented, and therefore the main valve guide can be effectively prevented. It is possible to prevent an increase in operation resistance due to the inclination of the valve and always ensure a light operation on the main valve.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a lightly operated water faucet according to 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. The main valve consists 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 on the upper side of the main valve 16 in the figure, that is, on the side opposite to the outflow water passage 14 with respect to the main valve 16.
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 a water guide hole 26 that is a small hole that passes through the main valve 16 and allows the inflow water passage 12 and the back pressure chamber 24 to communicate with each other.
The water guide hole 26 guides water from the inflow water channel 12 to the back pressure chamber 24 and increases the pressure in 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 allows the back pressure chamber 24 and the outflow water channel 14 to communicate with each other.
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 32 denotes a pilot valve in a pilot flow control valve mechanism. In this embodiment, the pilot valve 32 is separated from a drive shaft (spindle shaft) (drive member) 40 which will be described later, and is provided on the main valve 16 side. 16 is held so as to be able to move forward and backward.
Here, the pilot valve 32 has a substantially cylindrical shape (see FIG. 3), and moves forward and backward in the vertical direction in the drawing, that is, in the vertical direction (axial direction) in the drawing with respect to the pilot valve seat 42 provided in the main valve 16. The opening degree of the pilot water channel 28 is changed.
Specifically, when the pilot valve 32 is seated on the pilot valve seat 42 (see FIG. 2A), the pilot water passage 28 is shut off, and the pilot valve 32 is separated from the pilot valve seat 42 in the axial direction upward in the drawing. Thus, the pilot water channel 28 is opened.
Further, the opening degree of the pilot water passage 28 is changed in accordance with the amount of separation of the pilot valve 32 from the pilot valve seat 42.

As clearly shown in FIG. 2A, the main valve 16 is provided with a guide hole (pilot valve guide) 30, and a pilot valve 32 is held in the guide hole 30 so as to be capable of moving forward and backward. Yes.
Here, the guide hole 30 has a function as a holding hole for holding the pilot valve 32 and a function as a guide hole for guiding the pilot valve 32 to move forward and backward in the vertical direction (axial direction) in the drawing.

Specifically, as shown in FIGS. 2B and 3, ribs 34 extending in the axial direction at regular intervals along the circumferential direction are formed on the inner circumferential surface of the guide hole 30 so as to protrude inward. The ribs 34 hold the pilot valve 32 so as to be slidable (movable forward and backward) in the axial direction.
A water channel 36 is secured between the ribs 34 and 34, and the back pressure chamber 24 and the pilot water channel 28 communicate with each other through the water channel 36.
A packing 46 made of an elastic material such as rubber is provided on the lower surface of the pilot valve 32 in FIG. 2A. Specifically, the packing 46 is seated on the pilot valve seat 42.

As shown in FIG. 2A, a return spring (biasing means) 48 (see FIG. 3) made of a coil spring is interposed between the pilot valve 32 and the main valve body 18 of the main valve 16. The pilot valve 32 is always urged upward by the return spring 48 in the drawing, that is, in the backward direction.
The upper surface of the pilot valve 32 is an upward convex curved surface 38.
The urging force of the return spring 48 is weak. Specifically, the urging force of the return spring 48 is weaker than the force when the drive valve 40 directly pushes the main valve 16.

  In this pilot type flow regulating mechanism, the main water channel is shut off in the state shown in FIG. 1, that is, in a state where the pilot valve 32 is seated on the pilot valve seat 42 and the main valve 16 is seated on the main valve seat 22. Distribution stops.

In this state, when the pilot valve 32 is spaced upward from the pilot valve seat 42 in the drawing as shown in FIG. 4I and a gap is formed between the pilot valve seat 42 and the back pressure chamber through the gap. The water in 24 is extracted to the outflow water channel 14 side through the pilot water channel 28, 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.

  When the pilot valve 32 further moves backward in this figure 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 reverse movement of the pilot valve 32, the reverse movement is upward in the figure, and the flow rate of water is increased by further increasing the opening in the main water channel.

  On the other hand, as shown in FIG. 5I, the pilot valve 32 retreated upward moves forward downward in the figure, and when the gap between the pilot valve 32 and the pilot valve seat 42 becomes smaller, the back of the pilot valve 32 becomes here. As the pressure in the pressure chamber 24 increases and overcomes the pressure in the inflow water channel 12, the main valve 16 advances downward in the figure as shown in FIG. 5 (II) so as to balance the pressure. It moves, and the clearance 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.

When the pilot valve 32 further moves downward in the figure as shown in FIG. 5 (III) from this state, the main valve 16 moves forward in the figure following this, further reducing the flow rate of water. Let
The pilot valve 32 is seated on the pilot valve seat 42 formed on the main valve 16, and the main valve 16 is seated on the main valve seat 22, whereby the inflow water passage 12 and the outflow water passage 14 are blocked. Thus, the flow of water from the inflow water channel 12 to the outflow water channel 14 stops here (state shown in FIG. 1).

  As shown in FIGS. 4 and 5, in this embodiment, a completely closed state (the state shown in FIG. 1) is established between the pilot valve 32 and the main valve 16, specifically between the pilot valve seat 42. Always leave a gap between them. And the main valve 16 moves forward and backward by changing the gap large or small, and adjusts the flow rate of the water in the main water channel.

In FIG. 1, reference numeral 50 denotes a handle, and the drive shaft 40 is screwed to the handle 50 by a male screw 52 formed on the upper end portion thereof and a female screw 54 formed on the handle 50, and the drive shaft 40 is connected to the handle 50. 50 and rotate together.
Here, an annular groove is formed on the outer peripheral surface of the drive shaft 40, and an O-ring 56 having elasticity as a seal ring is attached thereto.

The drive shaft 40 has a large-diameter portion 58 at an intermediate portion in the axial direction, and a male screw 60 is provided on the outer peripheral surface thereof.
The male screw 60 is screwed into a female screw 66 formed on the inner peripheral surface of the cylindrical portion 64 of the body 62 of the light operation faucet 10.
The drive shaft 40 rotates integrally with the rotation of the handle 50 so that the drive shaft 40 moves forward and backward in the vertical axis direction in the figure, that is, in the forward and backward directions of the main valve 16 and the pilot valve 32 by screw feeding by the male screw 60 and the female screw 66. Move backwards.
The lower end surface of the drive shaft 40 (the surface facing the pilot valve 32) is a flat surface perpendicular to the axis, and the flat surface is in contact with the pilot valve 32, that is, the convex curved surface 38 of the upper end surface. Thus, a driving force is exerted downward on the pilot valve 32 in the figure.

FIG. 6 shows the operation of the light operation faucet 10 of the present embodiment.
As shown in FIGS. 1 and 4, in this embodiment, when the handle 50 is rotated in the forward direction, the drive shaft 40 rotates integrally therewith, and the drive shaft 40 moves forward in the drawing downward by the rotation. Then, the pilot valve 32 is pushed downward in the figure against the urging force of the return spring 48 at the flat lower end surface, and the pilot valve 32 is brought close to the pilot valve seat 42.
The pilot valve 32 approaching the pilot valve seat 42 reduces the gap between the pilot valve seat 42 and the pilot water passage 28 so that the opening degree is reduced.
As a result, the main valve 16 is followed and moved downward in the figure, and the opening of the main water channel is reduced to reduce the flow rate of water in the main water channel.

On the other hand, as shown in FIGS. 1 and 5, when the handle 50 is rotated in the reverse direction and the drive shaft 40 is moved backward in the drawing, the pilot valve 32 is moved upward in the drawing by the urging force of the return spring 48. The clearance between the pilot valve seat 42 and the pilot water passage 28 is increased.
Along with this, the main valve 16 moves backward in the figure following the backward movement of the pilot valve 32 to increase the opening of the main water passage and increase the flow rate of water in the main water passage.

In this embodiment, as shown in FIG. 6, the pilot valve 32 is separated from the drive shaft 40 and is held by the main valve 16 and under guidance by the guide hole 30 of the main valve 16 so as to be able to advance and retreat. Therefore, regardless of the inclination of the main valve 16, the pilot valve 32 moves toward and away from the main valve 16, specifically, while maintaining a correct vertical posture with respect to the pilot valve seat 42. That is, the main valve 16 and the pilot valve 32 move back and forth in the axial direction.
Therefore, in this embodiment, even if the main valve 16 is tilted when the valve is closed, the pilot valve 32 does not come into contact with the main valve 16, more specifically, the pilot valve seat 42, and does not come into contact with the pilot valve 32. The pilot valve 32 moves forward and backward to keep the gap between the pilot valve seat 42 and the pilot valve seat 42 large or small.
Therefore, when the pilot valve 32 hits the pilot valve seat 42, there is no inconvenience that the operation becomes heavy from that point.

Incidentally, FIG. 8 shows a case where the pilot valve 32A is fixed to the drive shaft 40 as a comparative example. In the case shown in FIG. 8, when the main valve 16A is inclined, the pilot valve 32A is shown in FIG. As shown in the partially enlarged view, the pilot valve seat 42A comes into direct contact with the one-sided state.
Accordingly, even if the pilot valve 32A is moved forward in the drawing downward in this state, the gap between the pilot valve 32A and the pilot valve seat 42A is not reduced, and the main valve is moved as the pilot valve 32A is moved downward in the drawing as it is. 16A is pushed downward. As a result, the operation load becomes large and the operation becomes heavy.
However, as apparent from the operation diagram of FIG. 6, this embodiment does not cause such inconvenience.

According to the light operation faucet 10 of the present embodiment as described above, the main valve 16 is held by the main valve 16 even if the main valve 16 may be tilted without being maintained in the correct vertical posture with respect to the main valve seat 22. The pilot valve 32 is tilted together with the main valve 16, and the pilot valve 32 moves forward and backward under the guidance of the guide hole 30 provided in the main valve 16. Therefore, the drive shaft 40 is driven regardless of the tilt of the main valve 16. The pilot valve 32 can be moved close to the pilot valve seat 42 by the driving of the pilot valve seat 42 while maintaining a correct vertical posture with respect to the pilot valve seat 42 (forward movement).
Therefore, the pilot valve 32 comes into contact with the pilot valve seat 42 provided in the main valve 16, and the clearance between the pilot valve seat 42 and the pilot valve 32 is not reduced despite the further forward movement of the pilot valve 32. The problem can be avoided, and the pilot valve 32 can move forward with respect to the pilot valve seat 42, that is, the main valve 16, while the gap between the pilot valve 32 and the pilot valve seat 42 is uniformly maintained over the entire circumference. It becomes possible to solve the problem that the operation becomes heavy due to one contact of the pilot valve 32 with respect to the main valve 16.

  In the present embodiment, a return spring 48 that biases the pilot valve 32 in the backward direction is provided, and the pilot valve 32 is moved forward and backward by biasing in the backward direction by the return spring 48 and driving in the forward direction by the drive shaft 40. Therefore, the pilot valve 32 can be smoothly opened and closed, that is, moved forward and backward with respect to the pilot valve seat 42.

Next, FIG. 7 shows a reference example .
In this embodiment, the pilot valve 32 is provided in an integral motion state on the drive shaft 40, and a small-diameter downward pin-shaped guide protrusion 68 is provided on the drive shaft 40, which is provided there by using the pilot water channel 28 as a guide hole. A main valve guide that is slidable in the axial direction, that is, slidably inserted in the advancing / retreating direction of the main valve 16, and that guides the main valve 16 in the advancing / retreating direction by the guide protrusion 68 and the pilot water channel 28, that is, the guide hole. It is the example which comprised.
In addition, it is also possible to provide a guide hole separately from the pilot water channel 28 and insert a guide protrusion into the guide hole slidably to form a main valve guide.

In the case of the example shown in FIG. 7, the main valve guide composed of the guide protrusion 68 and the pilot water channel 28, that is, the guide hole, can prevent the main valve 16 from being tilted satisfactorily.
Therefore, when the main valve 16 is tilted, the pilot valve 32 solves the problem that the main valve 16, more specifically, the pilot valve seat 42 provided on the main valve 16 is in a one-sided state and the operation load increases and the operation becomes heavy. Therefore, a light operation on the main valve 16 can always be ensured.
In this embodiment, a plurality of ribs are provided along the circumferential direction on the inner peripheral surface of the pilot water channel 28 as shown in FIG. 2B, and the guide projection 68 is guided by the ribs. It is also possible to form a water channel between the ribs.

  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 sectional drawing of the light operation faucet which is one Embodiment of this invention. It is a principal part expanded sectional view of FIG. It is a perspective view which decomposes | disassembles and shows the main valve of FIG. 1, a pilot valve, and a return spring. It is effect | action explanatory drawing at the time of opening operation of the light operation faucet of the embodiment. It is effect | action explanatory drawing at the time of closing operation of the light operation faucet of the embodiment. It is an effect | action figure in case the main valve inclines with respect to the main valve seat. It is a figure which shows a reference example . It is a comparative example figure which shows the case where a pilot valve is provided in the fixed state to the drive shaft. It is a figure which shows an example of the conventional light operation faucet.

DESCRIPTION OF SYMBOLS 10 Lightly operated water tap 12 Inflow water channel 14 Outflow water channel 16 Main valve 22 Main valve seat 24 Back pressure chamber 26 Water conveyance hole 28 Pilot water channel 30 Guide hole (pilot valve guide)
32 Pilot valve 40 Drive shaft (drive member)
42 Pilot valve seat 48 Return spring 68 Guide protrusion

Claims (3)

(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;
(B) a back pressure chamber that causes the internal pressure to act on the main valve as a pressing force in the valve closing direction;
(C) a water introduction 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 an approaching and separating direction with respect to a pilot valve seat provided on the main valve to change the opening of the pilot water channel, and follows the forward and backward movement of the pilot valve In a light operation faucet with a built-in pilot-type flow control mechanism that adjusts the flow rate in the main channel by moving the main valve forward and backward,
The pilot valve is separated from a drive member that drives the pilot valve and is provided on the main valve side. The main valve is provided with a pilot valve guide that guides the forward and backward movement of the pilot valve. The main valve is held by the main valve so as to be movable back and forth under the guidance of the pilot valve guide .
The drive member and the pilot valve are configured such that a part of a surface of the drive member facing the pilot valve is in contact with the pilot valve in a state where the drive member is brought into contact with the pilot valve vertically. A gap that allows a relative inclination between the pilot valve and the drive member between the opposing surface and the pilot valve around the contact portion. Light-operated faucet that features.   2. The urging means for urging the pilot valve in a backward direction according to claim 1, wherein the pilot valve is moved forward and backward by urging in the backward direction by the urging means and driving in the forward direction by the drive member. A light operation faucet characterized by   The light operation faucet according to any one of claims 1 and 2, wherein the main valve is a diaphragm valve.

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