JPH11182706A - Constant flow valve having check function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply reduce a cost by arranging a flow rate variable element to adjust a flow rate by elastic deformation by fluid pressure at water feeding time and a cutoff member to cut off the opening part of the flow rate variable element by back pressure at water feed stopping time. SOLUTION: The opening part 4 of a flow rate variable element 3 is deformed in a funnel shape on the basis of fluid pressure of raw water flowing in from the primary side to adjust a flow rate of the raw water. The raw water flows outside through an outflow passage 8 and a raw water outlet 13. The flow of the raw water is not hindered since the space part is generated between the opening part 4 and a valve element 5 after the valve element 5 moves to the secondary side by fluid pressure at raw water supply time from this primary side. The flow rate variable element 3 is restored by resiliency when supply of the raw water is stopped. The valve element 5 moves to the flow rate variable element 3 side since back pressure is applied to the inside of the umbrella-shaped part of the valve element 5 when the raw water flows backward from the secondary side, so that the umbrella-shaped part of the valve element 5 is brought into pressure contact with the opening part 4 to check a ounterflow of the raw water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant flow valve having a check valve function.

[0002]

2. Description of the Related Art Usually, as a means for removing dissolved gas in raw water, a deaerator using a hollow fiber-like gas separation membrane is frequently used because of its compactness and easy handling. As shown in FIG. 12, this type of apparatus includes a gas separation membrane module 4 in which a gas separation membrane such as a hollow fiber gas separation membrane is housed in a water supply line 42 connected to a raw water supply source 41.
3, the raw water is passed through the gas separation membrane module 43, and the inside of the gas separation membrane module 43 is evacuated in the water passing process to separate and remove the dissolved gas in the raw water. I have. The gas separation membrane module 43
A constant flow valve 44 for supplying a predetermined flow rate which is set in advance to obtain deaerated water having a predetermined degree of deaeration is provided in the water supply line 42. In addition, this water supply line 4
2 is provided with a check valve 45 for preventing backflow of raw water.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce costs by integrating a check valve and a constant flow valve in the above-mentioned deaerator.

[0004]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the invention according to the first aspect is characterized in that a fluid from a primary side at the time of water flow is provided in a valve body. A flow rate variable element that adjusts the flow rate by elastic deformation due to pressure,
It is characterized in that a blocking member for blocking the opening of the variable flow rate element by a reverse pressure from the secondary side at the time of stopping water flow is provided, and the invention according to claim 2 includes a variable flow rate element. A valve body, an umbrella-shaped valve body, and a lid member having a hole into which a shaft portion of the valve body is movably inserted and an outflow passage formed therein, wherein the invention according to claim 3 is characterized in that: The valve body includes a valve body having a variable flow rate element, and a lid member having a valve seat and an inflow path. The invention according to claim 4 forms a needle shaft and an outflow path in the valve body. The invention according to claim 5 is characterized in that a flow rate variable element that adjusts a flow rate by elastic deformation due to fluid pressure from a primary side when flowing water into the valve chamber, A valve that shuts off the inflow passage in the valve chamber due to the back pressure from the secondary side when stopped And a valve body having an inflow path, a valve seat and a valve chamber, a valve body having a water passage inserted into the valve chamber, A flow rate variable element mounted in a valve chamber, and a compression spring is provided between the valve body and the flow rate variable element. The invention according to claim 7, wherein the secondary side of the valve body is provided. And a lid member having a flow control unit and an outflow passage provided therein.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be explained.
In the valve body, the variable flow rate element that adjusts the flow rate by elastic deformation due to the fluid pressure from the primary side when water is flowing, and the opening of the variable flow rate element is shut off by reverse pressure from the secondary side when water flow is stopped. It is configured to have a blocking member that performs the operation.

The specific structure of the constant flow valve with a check function will be described. The flow variable element is formed, for example, by molding a synthetic rubber into a disk having a predetermined thickness, and forming an opening (hole) having a predetermined diameter at the center. Is provided. A groove is provided on the inner peripheral wall of the cylindrical valve body, and the variable flow rate element is mounted in the groove. One side is the primary side (raw water inlet side) and the other side is the secondary side (raw water outlet side) across this variable flow rate element.
A lid member provided with an umbrella-shaped valve body as a blocking member for blocking the opening on the secondary side of the valve body, and having a hole for freely inserting a shaft portion of the valve body and an outflow passage. Is provided. The valve body and the lid member are integrated by an appropriate means (for example, by screwing).

[0007] According to the constant flow valve with the check function having the above structure,
The opening of the variable flow rate element is deformed into a funnel shape based on the fluid pressure of the raw water flowing from the primary side, and the flow rate of the raw water is adjusted (constant flow rate). Then, the raw water flows out through the outflow channel. When the raw water is supplied from the primary side, the valve moves to the secondary side by the fluid pressure, and a space is formed between the opening and the valve, so that the flow of the raw water is not hindered. When the supply of raw water is stopped, the flow rate variable element is restored by elasticity. And when the raw water flows backward from the secondary side, since the back pressure is received inside the umbrella shape of the valve body, the valve body moves to the variable flow element side,
The umbrella-shaped portion of the valve body is pressed against the opening to prevent backflow of raw water.

Next, an embodiment which is an alternative to the above embodiment will be described. The constant flow valve with a check function described in this embodiment is a valve body provided with a flow rate variable element (similar to that described in the above-described embodiment), a lid formed with a valve seat and an inflow passage. It is composed of members.

The valve body is formed in a cylinder having a predetermined diameter, and has a mounting portion for mounting the variable flow rate element at one end (primary side). Then, the flow rate variable element is mounted on the mounting portion, and a valve member that forms an inflow passage with a valve seat that abuts on the opening of the flow rate variable element is provided. The lid member is appropriately mounted on the mounting portion of the valve body. The structure is integrated by means (for example, screwing).

[0010] According to the constant flow valve with the check function having the above structure,
The raw water flowing in from the primary side flows in from the inflow path, and accordingly, the opening of the variable flow rate element is deformed into a funnel shape based on the fluid pressure of the raw water, thereby forming a flow path of the raw water.
The flow rate of the raw water is adjusted (constant flow rate) in this flow path (gap) so that the raw water at a constant flow rate flows out to the secondary side. Further, when the supply of raw water from the primary side is stopped, the flow rate variable element is restored by elasticity, and the funnel-shaped deformed portion comes into contact with the valve seat to close the opening. Therefore, even when the raw water flows backward from the secondary side, it is possible to prevent the outflow to the primary side.

Next, a description will be given of a constant flow valve with a check function provided with an auxiliary mechanism for making the flow control more severe in the above embodiment. In this constant flow valve with a check function, a needle shaft having a hemispherical tip and a partition wall having an outflow passage are provided on the inner peripheral wall of the valve body as the auxiliary mechanism. The distal end of the needle shaft is provided at a position where a predetermined gap (flow path) can be secured when the opening of the variable flow rate element is deformed into a funnel shape by a preset fluid pressure. The outflow channel is formed by opening a plurality of channels in the partition.

According to the constant flow valve with the check function having the above structure,
The raw water flowing in from the primary side flows in through the inflow path, and accordingly, the opening of the variable flow rate element is deformed into a funnel shape based on the fluid pressure of the raw water, and the raw water flows out. The flow rate of the raw water is adjusted (constant flow rate) by a gap (flow path) between the funnel-shaped opening and the hemispherical tip of the needle shaft, and is discharged to the outside via the flow path. leak. Further, when the supply of raw water from the primary side is stopped, it is the same as in the above-described embodiment, and the description is omitted.

Next, a description will be given of an embodiment which is different from the above embodiment. A constant flow valve with a non-return function described in this embodiment includes a variable flow rate element that adjusts a flow rate by elastic deformation due to fluid pressure from a primary side when water is supplied into a valve chamber, and a secondary flow rate element when water flow is stopped. And a valve body that shuts off the inflow passage in the valve chamber by a back pressure from the side.

The specific configuration of the constant flow valve with a check function will be described. The valve chamber is formed on the secondary side of a cylindrical valve body having a partition. An inflow passage is opened at the center of the partition wall, and a valve seat is formed on a surface on the valve chamber side, and a valve body abutting the valve seat is provided. Then, a groove is formed at a predetermined position in the valve chamber, and the flow rate variable element is mounted in the groove. This flow rate variable element is the same as that described above, and the description is omitted. Further, a compression spring is provided between the valve body and the variable flow rate element.

According to the constant flow valve with the check function having the above-described structure,
Raw water from the primary side flows in from the inflow path, moves the valve body to the secondary side by fluid pressure against the urging force of the compression spring, and flows between the valve seat and the valve body. A channel is secured, and the raw water flows into the opening of the variable flow element through the water channel. The opening deforms into a funnel shape based on the fluid pressure of the raw water, regulates the flow rate of the raw water, and allows the raw water to flow out to the secondary side.
Further, when the supply of the raw water is stopped, the compression spring is restored, and the valve body is pressed against the valve seat to close the inflow path.
Therefore, even if the raw water flows backward from the secondary side when the supply of the raw water is stopped, it is possible to prevent the raw water from flowing out to the primary side.

Next, in the above-mentioned embodiment, in order to make the flow control more severe, the check valve is provided with a flow control portion and a lid member having an outflow passage on the secondary side of the valve body. The flow valve will be described. In this constant flow valve with a non-return function, the variable flow element has an elastic body (for example, rubber or the like) in which a central portion of a disk is formed in a curved shape and an opening (hole) having a predetermined diameter is provided in the central portion. It is molded with. The variable flow rate element is mounted in the groove in the valve chamber such that the curved concave portion is on the inflow side of raw water. Then, a cylindrical flow rate control part that forms a predetermined gap (flow path) between the outer peripheral wall of the curved convex part and a lid member that forms an outflow path is provided on a secondary side end surface of the valve body by appropriate means. (For example, screwed together).

According to the constant flow valve having the check function having the above structure,
The curved concave portion of the variable flow rate element expands due to the fluid pressure of the raw water flowing into the valve chamber from the primary side. Due to the expanded outer peripheral wall, a gap (flow path) formed between the outer peripheral wall and the flow rate control unit is narrowed, and the flow rate of the raw water is adjusted, and the raw water flows out through the outflow path. Further, when the supply of raw water from the primary side is stopped, it is the same as in the above-described embodiment, and the description is omitted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional explanatory view schematically showing the configuration of a first embodiment of a constant flow valve with a check function embodying the present invention, and FIG. 2 is a right side view of FIG.
FIG. 3 is an explanatory cross-sectional view showing an operation state at the time of supplying raw water in FIG.

1 and 2, a constant flow valve 1 with a check function according to the present invention includes a valve body 2 formed in a cylindrical shape, a flow rate variable element 3 having an opening 4 with a predetermined diameter, and the opening. An umbrella-shaped valve body 5 serving as a blocking member for blocking the valve 4, a hole 7 into which a shaft portion 6 of the valve body 5 is movably inserted, and a lid member 9 formed with an outflow passage 8.

The valve body 2 is formed, for example, by molding a synthetic resin into a cylinder having a predetermined diameter and providing a groove 10 at a predetermined position on the inner peripheral wall. The flow rate variable element 3 is formed, for example, by molding a synthetic rubber into a disk having a predetermined thickness and providing an opening 4 having a predetermined diameter at the center. Then, the variable flow rate element 3 is mounted in the groove 10, and one side (left side in FIG. 1) is set as a primary side (raw water inlet side) and the other side (right side in FIG. 1) is sandwiched between the variable flow rate elements 3. It is on the next side (raw water outlet side). The valve body 5 is formed, for example, by integrally molding an umbrella-shaped portion (symbol omitted) formed of a synthetic resin such that the flow rate variable element 3 side has a predetermined angle (120 °) and a shaft portion 6 having a predetermined length. . The lid member 9 is made of, for example, a synthetic resin. As shown in FIGS.
And a flange portion 11 joined to the outer peripheral surface of the
A partition wall 12 having a hole 7 for inserting the shaft portion 6 of the valve body 5 and an outflow passage 8 and a raw water outlet 13 are integrally formed.
As means for joining the valve body 2 and the lid member 9, for example, a female screw (not shown) is formed on the inner peripheral surface of the flange portion 11, and a screw ( (Not shown), the cover member 9 can be screwed to the valve body 2, so that the assembly is facilitated.

The constant flow valve 1 with a check function having the above structure is shown in FIG.
As shown in the operation diagram, the opening 4 of the variable flow rate element 3 is deformed into a funnel shape based on the fluid pressure of the raw water flowing from the primary side, and the flow rate of the raw water is adjusted (constant flow rate). Then, the raw water flows out through the outflow passage 8 and the raw water outlet 13. When the raw water is supplied from the primary side, the valve element 5 moves to the secondary side by the fluid pressure, and the opening 4
Since there is a space between the valve body 5 and the valve body 5, there is no hindrance to the flow of raw water. When the supply of raw water is stopped, the flow rate variable element 3 is restored by elasticity. When the raw water flows backward from the secondary side, a reverse pressure is applied to the inside of the umbrella-shaped portion of the valve body 5 (that is, the shaft portion 6 side). Side, and the umbrella-shaped portion of the valve body 5 is pressed against the opening 4 to prevent backflow of raw water.

Next, a constant flow valve 1 with a check function according to the present invention.
A second embodiment which is another embodiment will be described with reference to FIGS. Note that the same members as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 4 is a sectional explanatory view schematically showing the configuration of the constant flow valve 1 with a check function according to the second embodiment.
Fig. 5 is a left side view of Fig. 4. The second embodiment comprises a valve body 14 having a flow rate variable element 3 (similar to that described in the first embodiment), and a lid member 17 having a valve seat 15 and an inflow passage 16 formed therein. Have been.

The valve body 14 is formed, for example, of a synthetic resin into a cylinder having a predetermined diameter, and has one end (left side in FIG. 4).
A mounting portion 18 for mounting the variable flow rate element 3 is formed at the bottom. The mounting member 18 includes the lid member 17.
Are bonded in a state where the variable flow element 3 is mounted. Further, the lid member 17 is formed with a valve seat 15, an inflow passage 16, and a joint portion 19 that come into contact with the variable flow rate element 3. As means for joining the lid member 17 and the valve body 14, a female screw (not shown) is formed on the inner peripheral surface of the mounting portion 18, and a screw (not shown) is formed on the outer peripheral surface of the joint portion 19. ), The cover member 17 can be screwed onto the valve body 14, so that the assembly becomes easy.

According to the constant flow valve 1 with the check function having the above-described structure, the raw water flowing from the primary side flows in through the inflow passage 16, and the variable flow rate element 3 controls the flow rate of the raw water based on the fluid pressure of the raw water. The opening 4 is deformed into a funnel shape (dotted line in FIG. 4),
A raw water flow path is created. The flow rate of the raw water is adjusted in this flow path (gap) to discharge a constant flow of the raw water to the secondary side. Also,
When the supply of the raw water from the primary side is stopped, the flow rate variable element 3 is restored by elasticity, and the funnel-shaped deformed part contacts the valve seat 15 to close the opening 4. Therefore, even when the raw water flows backward from the secondary side, it is possible to prevent the outflow to the primary side.

Next, a description will be given of a constant flow valve 1 with a non-return function according to a third embodiment of the second embodiment, which is provided with an auxiliary mechanism for making the flow control more severe, with reference to FIG. In the constant flow valve 1 with a check function shown in FIG. 6, a needle shaft 20 having a hemispherical tip and a partition wall 22 having an outflow passage 21 are provided on the inner peripheral wall of the valve body 14 as the auxiliary mechanism. It is a thing. And the needle shaft 20
Is provided at a position where a predetermined gap (flow path) can be secured when the opening 4 of the variable flow rate element 3 is deformed into a funnel shape by a preset fluid pressure. The outflow passage 21 is formed by opening a plurality of flow passages in the partition wall 22.

According to the constant flow valve 1 with the check function having the above-described structure, the raw water flowing from the primary side flows in through the inflow path 16, and accordingly, the variable flow rate element 3 The opening 4 is deformed into a funnel shape based on the fluid pressure of FIG.
(Dotted line portion) and the raw water flows out. The flow rate of the raw water is adjusted (constant flow rate) by a gap (flow path) between the funnel-shaped opening 4 and the hemispherical tip of the needle shaft 20.
Then, it flows out through the outflow passage 21 to the outside. Also,
When the supply of the raw water from the primary side is stopped, it is the same as the second embodiment, and the description is omitted.

Next, the constant flow valve 1 with a check function according to the present invention.
A fourth embodiment, which is another embodiment, will be described with reference to FIGS. The same members as those in the first, second, and third embodiments are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 7 is a sectional explanatory view schematically showing the configuration of the constant flow valve 1 with a check function according to the fourth embodiment, and FIG.
FIG. 8 is a left side view of FIG. 7. FIG. 9 is a front view of the valve body 25. In the fourth embodiment, a partition 23 is provided at a predetermined position.
, A valve body 25, a compression spring 26 and a flow rate variable element 3 (similar to those described in the first embodiment).

The valve body 24 is formed, for example, by molding a synthetic resin into a cylinder having a predetermined diameter, providing a partition wall 23 on the inner peripheral wall of the cylinder, and opening an inflow passage 27 in the center of the partition wall 23. One side of the partition 23 is interposed between the primary side (FIG. 7).
, And the other is a secondary side (the right side in FIG. 7). Further, a groove 28 is provided at a predetermined portion of the inner peripheral wall on the secondary side of the valve body 24, and the variable flow rate element 3 is mounted in the groove 28, and a valve chamber 29 is provided between the variable flow rate element 3 and the partition 23. Is formed. The secondary side surface of the partition wall 23 is a valve seat 30, and a valve body 25 that comes into contact with the valve seat 30 is provided. As shown in FIGS. 7 and 9,
A water passage 31 having an outer diameter and an appropriate shape that can be freely inserted into the inner peripheral wall of the valve main body 24 is formed, and an inflow passage 27 provided in the partition wall 23 at the center is sealed by the action of a compression spring 26. Like that. Then, the variable flow rate element 3 is mounted in the groove 28 after the compression spring 26 is inserted, and the assembly of the constant flow valve 1 with the check function is completed. Therefore, as shown in FIG. 7, when water flow from the primary side stops,
The valve body 25 is moved by the action of the compression spring 26 to the valve seat 3.
It is pressed against 0.

According to the constant flow valve 1 with a check function having the above-mentioned structure, as shown in the operation diagram shown by the dotted line in FIG. 7, the raw water from the primary side flows in from the inflow passage 27 and flows into the valve by the fluid pressure. The body 25 is moved to the secondary side against the urging force of the compression spring 26, and a flow path is formed between the valve seat 30 and the valve body 25. The raw water flowing into the valve chamber 29 from the flow path via the water passage 31 flows into the opening 4 of the variable flow element 3. The opening 4 is deformed into a funnel shape based on the fluid pressure of the raw water, regulates the flow rate of the raw water (constant flow rate), and allows the raw water to flow out to the secondary side. When the supply of the raw water is stopped, the compression spring 26 is restored and the valve body 25 is pressed against the valve seat 30 to seal the inflow passage 27. Therefore, even if the raw water flows backward from the secondary side when the supply of the raw water is stopped, it is possible to prevent the raw water from flowing out to the primary side.

Next, in the fourth embodiment, in order to control the flow rate more severely, a lid member 34 having a flow rate control part 32 and an outflow passage 33 is provided on the secondary side end face of the valve body 24. A constant flow valve 1 with a check function as a fifth embodiment of the configuration will be described with reference to FIGS. The same members as those in the fourth embodiment are denoted by the same reference numerals, and duplicate description will be omitted.

FIG. 10 is a sectional explanatory view schematically showing the structure of a constant flow valve 1 with a check function according to a fifth embodiment.
1 is a right side view of FIG. In the fifth embodiment, the shape of the flow rate variable element 3 used in the fourth embodiment is changed. That is, as shown in FIGS. 10 and 11, the variable flow rate element 3 is formed by forming a central portion of a circular disk having a predetermined diameter into a curved shape, and providing an opening 4 having a predetermined diameter at the center of the curved portion. It is formed of an elastic body (for example, rubber or the like). The flow rate variable element 3 is mounted in the groove 28 so that the curved concave portion is on the inflow path 27 side. Then, the cylindrical flow rate control part 32 forming a predetermined gap (flow path) between the outer peripheral wall of the curved convex part and the lid member 34 forming the outflow path 33 are connected to the secondary side end face of the valve body 24. And a suitable means (for example, screwed together).

According to the constant flow valve 1 with the check function having the above-mentioned structure, as shown by the imaginary line in FIG. 10, the raw water flowing into the valve chamber 29 passes through the curved concave portion of the variable flow rate element 3 to the raw water. The fluid flows out of the opening 4 while expanding based on the fluid pressure of the fluid, and the flow rate is adjusted (constant flow rate) in the gap (flow path) between the outer peripheral wall of the curved convex portion and the flow rate control section 32, and Flows out from 33 to the secondary side. When the supply of raw water is stopped, the operation is the same as in the fourth embodiment, and the description is omitted.

[0035]

As described above, according to the present invention, a variable flow rate element for adjusting a flow rate by elastic deformation due to fluid pressure from a primary side at the time of water flow, Since it is a constant flow valve with a check function provided with a shut-off member that shuts off the opening of the flow rate variable element by a back pressure from the secondary side, the structure is simple and the cost is low, and the conventional check valve and The cost can be significantly reduced as compared with the cost of two valves of the constant flow valve.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view schematically showing the configuration of a first embodiment of a constant flow valve with a check function according to the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is an explanatory sectional view showing an operation state at the time of supplying raw water in FIG. 1;

FIG. 4 is an explanatory cross-sectional view schematically showing a configuration of a second embodiment of a constant flow valve with a check function according to the present invention.

FIG. 5 is a left side view of FIG.

FIG. 6 is an explanatory sectional view schematically showing the configuration of a third embodiment of a constant flow valve with a check function according to the present invention.

FIG. 7 is an explanatory sectional view schematically showing a configuration of a fourth embodiment of a constant flow valve with a check function according to the present invention.

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is an explanatory front view of the valve body shown in FIG. 8;

FIG. 10 is a sectional explanatory view schematically showing a configuration of a fifth embodiment of a constant flow valve with a check function according to the present invention.

FIG. 11 is a right side view of FIG.

FIG. 12 is an explanatory diagram of a flow of a conventional degassing apparatus provided with a check valve and a constant flow valve in a water supply line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Constant flow valve with check function 2 Valve main body 3 Flow variable element 4 Opening 5 Valve body 6 Shaft 7 Hole 8 Outflow path 9 Lid member 14 Valve body 15 Valve seat 16 Inflow path 17 Lid member 20 Needle shaft 21 Outflow path DESCRIPTION OF SYMBOLS 22 Partition wall 24 Valve main body 25 Valve body 26 Compression spring 27 Inflow path 29 Valve seat 30 Valve room 31 Water flow path 32 Flow control part 33 Outflow path 34 Cover member

Continuation of front page (72) Inventor Hiroaki Fujiwara Miura Kogyo Co., Ltd. 7, Horie-cho, Matsuyama-shi, Ehime

Claims (7)

[Claims] 1. A flow rate variable element 3 for adjusting a flow rate by elastic deformation due to a fluid pressure from a primary side at the time of water flow in a valve body 2, and said flow rate is controlled by a reverse pressure from a secondary side when water flow is stopped. A constant flow valve with a check function, wherein a blocking member for blocking an opening 4 of the variable element 3 is provided. 2. A valve body 2 having a variable flow rate element 3, an umbrella-shaped valve element 5, and a lid member formed with a hole 7 into which a shaft portion 6 of the valve element 5 is freely inserted and an outflow path 8. 9. A constant flow valve with a backflow function, comprising: 3. A valve body 14 having a variable flow rate element 3,
A constant flow valve with a check function comprising a valve seat 15 and a lid member 17 having an inflow passage 16 formed therein. 4. The constant flow valve according to claim 3, wherein a partition wall 22 having a needle shaft 20 and an outflow passage 21 is provided on the valve body 14. 5. A variable flow rate element 3 for adjusting a flow rate by elastic deformation due to a fluid pressure from a primary side at the time of water flow in a valve chamber 29, and said valve at a reverse pressure from a secondary side when water flow is stopped. A constant flow valve with a non-return function, comprising a valve body 25 for shutting off an inflow passage 27 in a chamber 29. 6. A valve body 24 having an inflow path 27, a valve seat 30, and a valve chamber 29, a valve body 25 having a water passage 31 inserted into the valve chamber 29, and mounted in the valve chamber 29. Variable flow element 3, valve element 25 and variable flow element 3
A constant flow valve with a non-return function, wherein a compression spring 26 is provided between the valve. 7. A flow control unit 3 is provided on a secondary side of the valve body 24.
The constant flow valve according to claim 6, further comprising a cover member (34) formed with the outlet (2) and the outflow passage (33).