WO1998045631A1

WO1998045631A1 - Suction and exhaust valve

Info

Publication number: WO1998045631A1
Application number: PCT/JP1997/004618
Authority: WO
Inventors: Hiroshi Yokota
Original assignee: Kabushiki Kaisha Yokota Seisakusho
Priority date: 1997-04-04
Filing date: 1997-12-15
Publication date: 1998-10-15
Also published as: AU5412598A; JP3876349B2

Abstract

A suction and exhaust valve, and more particularly a convenient suction and exhaust valve, which eliminates a partial pressure causing a valve disc to be sucked to a valve port, and simultaneously meets requirements of making a float lightweight and small-sized for the purpose of cost and space savings and making the valve port large in diameter for the purpose of quick suction and exhaust. A suction and exhaust valve provided on a liquid feed pipeline and adapted to permit a float to move up and down to open and close a valve port, mainly characterized by comprising a pressure bearing plate (6) mounted on an inner wall of a valve box upper end (1e) through a seal member (6s) movably up and down and having substantially the same pressure bearing area as that of a valve disc (3), and by a bag chamber (f) sealingly enclosed and defined between the pressure bearing plate (6) and the valve box upper end (1e) and always communicating with a valve box lower chamber (1a) via a communication passage (8).

Description

Description Intake and exhaust valves Technical field

The present invention relates to a suction / exhaust valve interposed in a liquid feed pipe, and more particularly to a float for eliminating cost and space by eliminating a biased pressure for sucking a valve body to a valve port. Simultaneously satisfying both the size reduction and the large diameter of the valve port for quick intake and exhaust, the opening and closing operation of the valve port is smooth without vibration, the sealing property when the valve port is closed is good, and furthermore, trash-sand, dust, etc. The aim is to obtain a convenient intake / exhaust valve that is difficult to clog. In this specification, the term “water” generically represents a liquid, and the term “air” generically represents a gas. Background art

Conventionally, various types of intake and exhaust valves have been proposed, but in the case of interposing a general water supply pipe as an example, the main purpose is to:

(1) Discharge of air in the water pipe when water is injected into the pipe,

(2) Inhalation of air into the water supply pipeline when draining the pipeline,

(3) Discharge of air entrained in water when water is passed through the water pipe

And so on, to maintain the safety of pipelines and smooth water flow. The simplest conventional intake / exhaust valve is, for example, a single port intake / exhaust valve as shown in FIG. This includes a float which moves up and down in response to variations in the water level inside the valve casing, the force and performs intake and exhaust opening and closing the valve port by the lifting ^?, this case, the valve port by temporarily float closed When the internal pressure is applied to the valve, i.e., the so-called suction state, the float cannot be easily lowered, and even if air is accumulated in the valve box and the water level drops, the valve will not open unless the internal pressure decreases. So above (1) It has a serious disadvantage that it can be used for the purpose of (2) but not for the purpose of (3).

In order to overcome this drawback, it is necessary to increase the size (buoyancy and weight) of the float relative to the pressure applied to the valve port. If there is a practical limit to increasing the float, , I have to choose to make the valve smaller. This inevitably results in a new drawback in that rapid intake and exhaust cannot be performed, and that dirt in the pipeline, such as sand and dust, tends to be clogged.

On the other hand, one of the prior arts proposed to satisfy all of the above (1), (2) and (3) is a so-called rapid intake / exhaust valve having two large and small valve ports as illustrated in FIG. . This is a mechanism that floats in a large valve strength valve box with a small valve port formed inside to open and close the large valve port, and furthermore, the float opens and closes the small valve port. in a state where large valve body is applied internal pressure to close the atmospheric valve port, the air force in the valve ^box? When ball connexion water level is lowered, is that the small valve port float descends to the exhaust opening.

However, this quick intake / exhaust valve is simply a combination of large and small valves, so for accurate operation, if the float is compact, it is necessary to reduce the diameter of the small valve port as much as possible. , (3) generating force ⁵ of the water entrained air of water passing through the 'in case a large amount of its emissions is too late, moreover, dust in the pipeline', leaving still the disadvantage that the sand 'dust and the like is likely to jam I have.

The essence of these problems in the prior art is that, as a prerequisite for a float-based valve, it is desirable that the float force is large (ie, the buoyancy and weight are large) in order to open and close the valve port with sufficient force. Needless to say, in order to overcome the internal pressure applied to the valve port area when the water level falls (uneven pressure that pushes the valve body up to the valve port and sucks it), the float must be made heavier to open the valve port. That is, it is necessary to increase the ratio of the size of the float to the size of the valve port. Therefore, the float is lightened to save cost and space, and for quick intake and exhaust The increase in the diameter of the valve port is a trade-off, and it has generally been considered difficult to simultaneously satisfy these conflicting conditions.

Another problem with the prior art is that the valve body and the float vibrate (so-called chattering and hunting) near the valve port closure, and are liable to generate abnormal noise. It can even lead to deterioration and damage. This is because, in the vicinity of the closure of the valve opening, the speed of the passing fluid is originally high, and in addition to the fact that it requires float buoyancy, it is often made of a light material, which inevitably causes vibration and resonance. There is also a reason that sound is easily generated.

Therefore, the present invention introduces a new technical concept that eliminates the biased pressure that causes the valve element to be sucked to the valve port, drastically solves these problems, and reduces the cost and space for the float. Simultaneous miniaturization and large-diameter valve port for quick intake and exhaust, smooth opening and closing operation of valve port with no vibration, good sealing when valve port is closed, and further dust / sand particles The purpose is to obtain a convenient intake and exhaust valve

Ό o Disclosure of invention

In order to achieve the above object, the present invention relates to an intake / exhaust valve interposed in a liquid supply pipe line, which opens and closes a valve port by raising and lowering a float to intake and exhaust air. The lower chamber 1a and the upper valve box chamber 1d are defined.The lower valve chamber 1a has an attachment port a to the liquid feed line, the valve box partition 1w has a valve port c, and the upper valve box. The chamber 1 d has a valve box 1 with an open air vent d to each open air, a float 2 provided in the valve box lower chamber 1 a so as to be able to move up and down, and a valve port c linked to the up and down movement of the float 2 c. And a pressure receiving plate 6 that is mounted on the inner wall of the valve box upper end 1 e so as to be able to move up and down via a sealing member 6 s and has a pressure receiving area substantially equal to that of the valve 3. The bag chamber f, which is connected by the pressure receiving plate 6 to the valve body 3 and the force s connecting member 5 and is hermetically sealed between the pressure receiving plate 6 and the upper end 1 e of the valve box, is always connected by the communication passage 8. communicates with the valve box lower chamber 1 _a It is characterized by having. In the present invention, a valve opening / closing force adjusting mechanism 9 for adjusting the opening / closing force of the valve body 3 with respect to the valve port c may be provided.

Also, the present invention relates to an intake / exhaust valve which is interposed in a liquid supply pipe line and opens and closes a valve port by raising and lowering a float to intake and exhaust air. 1 d, the lower valve chamber 1 a has a mounting port a for the liquid feed line, the valve box partition 1 w has a valve port c, and the upper valve chamber 1 d has ventilation to the outside air. mouth d ^force? with each opening the valve box 1, a float 2 having a liquid specific gravity greater than the and the liquid supply pipe in mounted vertically movably in the valve box lower chamber 1 a, a portion of the weight of the float 2 A biasing member 10 having an acting force for canceling the pressure, a valve body 3 for opening and closing the valve port c in conjunction with the vertical movement of the float 2, and a sealing member 6s on the inner wall of the upper end 1e of the valve box. And a pressure receiving plate 6 having a pressure receiving area substantially equal to that of the valve body 3. The pressure receiving plate 6 and the valve body 3 are connected by a connecting member 5, and the pressure receiving plate 6 and the upper end of the valve box are provided. 1 sealingly encased formed bag chamber f between e is characterized in that it communicates always the valve box lower chamber 1 a Te communication passage 8 Niyotsu.

In the present invention, between the valve casing partition portion 1 w and the valve body 3 which valve port c is opened, the floating closing member 1 3 force can lift the range of the gap of ^that? Is interposed, the free movement opening and closing member 13 is formed in such a shape that the opening near the center portion functions as a valve port opened and closed by the valve element 3 and the vicinity of the outer edge functions as a valve element opening and closing the valve port c. The valve port c may be configured to be opened and closed via the opening and closing member 13. Further, the bag chamber f may be integrally formed on the upper portion of the floating opening / closing member 13. Further, a strainer 14 may be attached to the fluid passage in the valve box 1. With these configurations, the suction / exhaust valve of the present invention, when injecting the liquid into the liquid supply pipe, exhausts the residual gas in the pipe while increasing the float 2 and the valve body 3 as the liquid level rises. s Ascend and close valve port c. At the time of drainage from the liquid supply pipe, the float 2 and the valve body 3 are lowered as the liquid level is lowered to open the valve port c, and the outside air is sucked into the pipe. Then, gas is generated in the liquid supply line while the line is full. In this case, the present invention is provided with a pressure balance mechanism that eliminates suction of the valve body 3 to the valve port c due to the generated pressure, so that the liquid level does not depend on the magnitude of the generated pressure in the valve box. Float 2 and valve body 3 easily descend as valve descends to open valve port c and exhaust gas generated properly. Therefore, even if the valve is installed in a high-pressure liquid feed line, the operation of the valve body 3 follows the change in the liquid level without being extreme, and the opening and closing operation of the valve port is smooth, and the water hammer when closing the valve port etc. No impact occurs, no damage to parts. In addition, due to the configuration of this pressure balance mechanism, rapid intake and exhaust is possible even with a compact float 2, good sealing when the valve port is closed, and dust and sand particles including the eight communication paths. · It also has the advantage that clogging force due to dust and the like is unlikely to occur.

Also, it is possible to suppress the occurrence of vibration and abnormal noise near the valve port closure. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an overall vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is an overall vertical sectional view showing a second embodiment of the present invention.

FIG. 3 is an overall vertical sectional view showing a third embodiment of the present invention.

FIG. 4 is an overall vertical sectional view showing a fourth embodiment of the present invention.

FIG. 5 is an overall vertical sectional view showing a fifth embodiment of the present invention.

FIG. 6 is an overall vertical sectional view showing a sixth embodiment of the present invention.

FIG. 7 is an overall vertical sectional view showing a seventh embodiment of the present invention.

FIG. 8 is an overall vertical sectional view showing an eighth embodiment of the present invention.

FIG. 9 is an overall vertical sectional view showing an example of a conventional intake and exhaust valve. FIG. 10 is an overall longitudinal sectional view showing an example of a conventional intake and exhaust valve. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, common parts in the drawings are denoted by common reference numerals, and Details of the intake and exhaust valves will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. Reference numeral 1 in the figure denotes a valve box of an intake / exhaust valve which is interposed in the liquid supply pipe line and suctions / exhausts by raising / lowering the float. In the valve box 1, a partition is formed into a valve box lower chamber 1a and a valve box upper chamber 1d by a valve box partitioning portion 1w. (Not shown) The mounting port a is opened, the valve seat 4 is provided in the valve box partition 1 w, the valve port c is opened, and the side of the valve chamber upper chamber 1 d is open to the outside air d. Is open.

A float 2 is provided in the valve box lower chamber 1a so as to be able to move up and down. Between the float 2 and the inner wall of the valve box lower chamber 1a, a sufficient flow path force ⁵ 'through which a liquid or gas can pass is secured.

At the top of the float 2, a valve element 3 is attached (in the case of this embodiment, fixed), and moves up and down in the valve box lower chamber 1 a in conjunction with the float 2 to open and close the valve port c. As means for maintaining the sealing at the valve port c closed, but in this diagram 0 are sealed member 3 ^three? Exemplary ring form, be of other types as long as it has a function of sealing Of course it is good.

The pressure receiving plate 6 is provided in the valve box upper chamber 1 d so as to be able to move up and down freely, and the pressure receiving plate 6 is located above the ventilation port d of the valve box upper chamber 1 d via a sealing member 6 s, that is, It is mounted on the inner wall of the upper end 1e of the valve box. The pressure receiving area A 2 of the pressure receiving plate 6 is set to a value substantially equal to the pressure receiving area A 1 of the valve element 3. In this drawing, a diaphragm type seal member 6 s of the pressure receiving plate 6 is illustrated in the drawing, but other types such as a velofram and a seal ring may be used as long as they have the same function. Are of course δ books.

The pressure receiving plate 6 and the valve body 3 are connected by a connecting member 5, and are supported by appropriate guides 1 g;

The bag chamber f is hermetically sealed by the sealing member 6 s between the pressure receiving plate 6 and the upper end 1 e of the valve case, and is always communicated with the lower valve case 1 a by the communication passage 8. I have.

Next, the operation principle of the intake / exhaust valve of the present invention will be described with reference to FIG. 1. The pressure receiving plate 6 and the valve body 3 which have a symmetrical positional relationship across the valve port c and have substantially equal pressure receiving areas are provided. The baggage chamber f, which has an internal pressure that pushes down the pressure receiving plate 6 and the valve chamber lower chamber 1a, which has an internal pressure that pushes up the valve body 3, is connected to each other and has the same pressure. I have. That is, this structure constitutes a pressure balance mechanism that always cancels the acting force of the pressure applied to the valve body 3 by the acting force of the pressure applied to the pressure receiving plate 6 in the opposite direction. Therefore, as for the acting force for opening and closing the valve body 3, the pressure element is eliminated, and the weight of the movable part including the float 2, the valve body 3, the connecting member 5, the pressure receiving plate 6, etc., and the buoyancy of the float 2 Because it is determined only by the relationship, it moves in a straightforward manner in response to the change in the liquid level in the lower valve box 1a, and the operation is quick and accurate, and the valve port c of the valve 3 Phenomena such as sticking to the surface do not occur.

Looking at the operation mode, at the time of injecting liquid into the liquid feed line, the float 2 and the valve are raised as the liquid level rises while exhausting the residual gas in the line along the path a → c → d. Body 3 power ⁵ 'rises, closes valve port c to prevent overflow of injection. When the liquid is drained from the liquid feed line, the float 2 and the valve body 3 move down as the liquid level decreases, and the valve port c is opened, so that outside air enters the line d → c → a. Prevent deformation and destruction of the pipeline by inhaling air in the path.

If gas is generated in the liquid supply pipe while the liquid supply pipe is filled, the float 2 and the valve body 3 are lowered as the liquid is pushed down by the generated gas and the liquid level is lowered. To open the valve port c and exhaust the generated gas through the path from c to d.In this case, in particular, at this time, the pressure balance that eliminates the suction of the valve element 3 to the valve port c by the pressure of the generated gas Since the mechanism is provided in the present invention, the float 2 and the valve body 3 easily descend as the liquid level falls, regardless of the magnitude of the generated pressure in the valve box lower chamber 1a, and the valve port c The exhaust gas can be quickly and accurately exhausted. And, even if the valve is installed in a high-pressure liquid feed line, the operation of the valve element 3 is not extreme and follows the change in the liquid level directly, so that the opening and closing operation of the valve port is smooth and water hammer when the valve port is closed No impact is generated and there is no damage to parts. Also, due to the structure of the pressure balance mechanism, the diameter of the valve port c can be made relatively large, so that even a compact float 2 can be used for rapid intake and exhaust, and various sealing means can be easily applied. It has a good sealing performance when the valve port is closed. Furthermore, the communication passage 8 that communicates the lower valve chamber 1a and the bag chamber f does not have a fine flow path because the passage inner diameter may be sufficiently large, and the fluid passing therethrough flows in one direction. Rather, the flow comes to a dead end in the bag room f and reciprocates, so that it has the special advantage that it is difficult to generate a clogging force of ⁵ 'due to dirt, sand, and dust.

Next, FIG. 2 (second embodiment) to FIG. 8 (eighth embodiment) will be described. The second embodiment shown in FIG. 2 is a modification of the first embodiment in which a port flam is applied to the sealing member 6 s of the pressure receiving plate 6 and the communication passage 8 is integrally formed in the valve box 1. Illustrated. Even if a liquid enters the bag compartment f, it is easily pulled down even if it enters the bag compartment f.

Regarding the acting force on the valve element 3, in addition to setting the weight of the movable part such as the float 2 and the buoyancy of the port 2 at the time of manufacture, the force acting upward or downward in accordance with the pipeline conditions at the installation site The valve opening / closing force adjusting mechanism 9 may be interposed between the connecting member 5 and the valve box 1 so that the valve body 3 can be actuated to adjust the operation start point and the valve opening / closing force. Also illustrated. In this drawing, a spring is fixed to the connecting member 5 and a spring stopper with a detent disposed above the connecting member 5, and the adjustment shaft screwed to the spring holder is rotated from the outside of the valve box 1 by rotating the adjusting shaft. Although a mechanism that can adjust and set the biasing force of the spring upward or downward to an arbitrary force is shown, it is a matter of course that the mechanism is not limited to the illustrated one as long as the mechanism has the same effect.

The other configuration and operation and effect are the same as those of the first embodiment, and thus the detailed description is omitted. The third embodiment shown in FIG. 3 is the same as the second embodiment except that a means for suppressing vibration (so-called chattering and hunting) and abnormal noise near the valve opening c of the valve body 3 is added. It is. That is, the float 2 of the second embodiment is made of a material having a mass as large as possible that exceeds the specific gravity of the liquid in the liquid sending pipe. On the other hand, instead of the valve opening / closing force adjusting mechanism 9, a part of the weight of the float 2 is used. By connecting the urging member 10 having an acting force for canceling the pressure to the connecting member 5 which penetrates and extends from the upper end 1 e of the valve box, the float 2, the valve body 3, the connecting member 5, and the pressure receiving member The inertial mass of a series of movable parts including the plate 6, the urging member 10 and the like is increased, and the generation of vibration is suppressed by the inertial resistance of the movable parts themselves.

In this drawing, a weight attached to a lever that changes the direction of the acting force is used as the urging force member 10, and a valve body is installed at the installation site according to the weight and buoyancy of the float 2. 3 adjusts the operation start point and the valve force, etc., so that can be set, illustrated the biasing force adjuster 1 0 a force of formula Ri feed ^screw? what is interposed. As for the float 2, a solid structure with a solid content is shown as a representative value of the mass, but it goes without saying that a hollow structure may be used if the mass is large.

The other configuration and operation and effect are the same as those of the second embodiment, and thus the detailed description is omitted.

In the fourth embodiment shown in FIG. 4, the urging member 10 of the third embodiment is replaced by a weight instead of a weight. That is, similarly to the third embodiment, the float 2 is made of a material having a mass as large as possible that exceeds the specific gravity of the liquid in the liquid sending pipe, and has an upward acting force that offsets a part of the weight of the float 2. As the biasing member 10, a spring is interposed between the connecting member 5 and the valve box 1, and the biasing force adjuster 10 a can adjust and set the acting force. As a result, the inertial mass of a series of movable parts including the float 2, the valve body 3, the connecting member 5, the pressure receiving plate 6, etc. is increased, and the generation of vibration is suppressed by the inertial resistance of the movable part itself. Things. The other configuration and operation and effect are the same as those of the third embodiment, and thus the detailed description is omitted.

In the fifth embodiment of FIG. 5, the float 2 of the fourth embodiment has a flat shape that is wide in the horizontal direction to increase the sensitivity to a change in the liquid level to give the ability to accurately follow. By placing a predetermined distance from the body 3, it is possible to prevent the dust, dust, etc. in the liquid feed line from rising up ⁵ 'and sticking to the valve port c, and to attach it to the liquid feed line. By attaching a strainer 14 to the mouth a, the intrusion of dirt, dust, etc. into the valve box 1 itself is prevented as much as possible.In particular, dirt, dust, etc., such as agricultural water and sewerage are sent. This is an example in which even when mixed in a liquid, it can be used without any trouble.

In this figure, in particular, since the strainer 14 is attached to the mounting port a that protrudes inside the inner diameter of the liquid sending pipe, it is always washed with the liquid in the liquid sending pipe. In addition, since there is no danger that light dirt, dust and the like enter the mounting port a due to buoyancy and stay there, there is an advantage that the clogging force of the strainer 14 is hardly generated. The other configuration and operation and effect are the same as those of the fourth embodiment, and thus the detailed description is omitted.

In the sixth embodiment of FIG. 6, in addition to the third embodiment, the valve element 3 opens and closes the valve port c via the floating opening / closing member 13. That is, between the valve box partition 1 w having the valve port c opened and the valve body 3, a substantially annular floating opening / closing member 13 capable of moving up and down in the range of the gap is provided. The floating opening / closing member 13 is formed such that an opening near the center portion functions as a valve port that is opened and closed by the valve element 3, and a portion near the outer edge portion functions as a valve element that opens and closes the valve port c. A sufficient flow path through which gas power can pass is secured between the outer edge portion and the inner wall of the valve box lower chamber 1a, and is supported by appropriate guides so that it can be moved up and down with little lateral swing.

In this figure, looking at the operation mode when the float 2 rises, the valve 3 is pushed up by the float 2 and the valve is opened while the valve port b of the floating opening / closing member 13 is closed. The body 3 and the floating opening / closing member 13 form a body, and while the gas is rapidly exhausted along the path a → the floating opening / closing member 13 → side c → c → d, the gas is pushed up by the float 2 and exhausted. After completion, the portion corresponding to the valve body near the outer edge of the floating opening / closing member 13 (that is, the portion where the seal member 13s is attached) closes the valve port c to shut off communication with the outside air.

Conversely, looking at the operation mode when the float 2 descends, if the internal pressure of the valve box lower chamber 1a decreases as in the case of drainage of the liquid supply line, the floating opening / closing member 13 and the valve 3 Force Lowers together to open valve port c, and intakes rapidly. On the other hand, when the internal pressure is applied to the valve box lower chamber 1a, such as when gas is accumulated in the filled liquid sending pipeline, the floating opening / closing member 13 remains sucked to the valve port c by the internal pressure. The valve 3 is easily detached from the valve port b and exhausted because of the pressure balance mechanism described above. If the exhaust cannot be completed, the floating opening / closing member 13 released from the suction to the valve port c by the opening of the valve port b is separated from the valve port c by its own weight and descends, and further large amount of exhaust is performed. To perform a two-stage operation.

In this figure, the floating opening / closing member 13 is raised by being pushed up by the float 2, but in addition to this, the floating opening / closing member 13 itself is provided with sufficient buoyancy. Of course, a mechanism that has a function as a second float that does not rely on the lifting force of the float 2 may be used.

The other configuration and operation and effect are the same as those of the third embodiment, and thus the detailed description is omitted.

In the seventh embodiment shown in FIG. 7, the urging member 10 of the sixth embodiment is replaced with a weight instead of a weight. That is, as in the sixth embodiment, the float 2 is made of a material having a mass as large as possible, which exceeds the specific gravity of the liquid in the liquid sending pipe, and has an upward acting force that offsets a part of the weight of the float 2. As the biasing member 10, a spring is interposed between the connecting member 5 and the valve box 1, and further, the acting force can be adjusted and set by a biasing force adjusting unit 10 a. As a result, the inertial mass of a series of movable parts including the float 2, the valve body 3, the connecting member 5, the pressure receiving plate 6, and the like is increased. As described above, the generation of vibration is suppressed by the inertial resistance of the movable part itself.

Also, in this figure, when the float 2 descends, the valve body 3 force ⁵ ′ is easily separated from the valve port b by the above-mentioned pressure balance mechanism and exhausted, and then the valve port is opened by the opening of the valve port b. Floating open / close member released from suction to c 1 3 force s', float 2 5 Locking part 1 5 force s The floating opening / closing member 13 is dragged and lowered. In addition, the floating opening / closing member 13 is used to prevent ingress of dirt and dust into the valve ports b and c. In order to prevent the movable part such as the float 2 from being blown up by the dynamic pressure of the liquid or gas flowing from the liquid feed line, the operation becomes inaccurate. A dynamic pressure shielding plate 16 is provided below the float 2.

The other configuration and operation and effect are the same as those of the sixth embodiment, and thus the detailed description is omitted.

In the eighth embodiment shown in FIG. 8, the bag chamber f including the pressure receiving plate 6, the sealing member 6s, etc. of the seventh embodiment is integrally formed near the center of the upper surface of the floating opening / closing member 13. What was done is illustrated. In this case, the floating opening / closing member 13 also serves as a part of the valve box partition 1w.

In this drawing, the connecting member 5 is made hollow, and its upper and lower through holes are used as the communication passage 8, for example, to show that the whole structure can be made compact. As in the seventh embodiment, the seal member 6 s of the pressure receiving plate 6 employs Velofram, as in the seventh embodiment. In addition, the pressure receiving plate 6 is formed of a piston and the sealing member 6 s has a sealing ring ゃ 0. A more compact structure, such as the use of a ring, may be used.

Various design choices can be made according to the specifications, such as the shape of the float 2 and the method of guiding it, the shape of the valve box 1 and the shape of the ventilation lid added to the ceiling. What is also illustrated.

The other configuration and operation and effect are the same as those of the seventh embodiment, and therefore, detailed description is omitted.

Next, technical matters common to the embodiments will be described.

The type and shape of the mounting port a and the ventilation port d of the valve box 1 may be appropriately selected such as a screw-in type or a flange type according to the specification conditions.

Figs. 3 to 7 illustrate the case of using a material with the largest possible mass that exceeds the specific gravity of the liquid in the liquid feed line for float 2, but the material may be metal or non-metal. However, it can be appropriately selected. In addition, FIG. 3 shows a solid structure as a representative of the mass, but it goes without saying that a hollow structure may be used as long as the mass is large.

For interlocking how the float 2 and the valve element 3, the force that illustrates the also fixed in each ^embodiment?, Is a matter of course it is may be interlocked by contact with each other. Depending on the specifications, in order to prevent the moving parts such as the float 2 from being blown up by the dynamic pressure of the liquid or gas flowing from the liquid feed line, the operation becomes inaccurate. As shown in FIG. 8, the float 2 may be formed into a shape having less fluid resistance, or a dynamic pressure shielding plate 16 may be provided below the float 2 as shown in FIGS. For the seal member to be mounted on places requiring sealing such as the seal part of the pressure receiving plate 6 and the valve port closing part of each valve body, a diaphragm, a velofram, a seal ring, an O-ring, etc. are applied as appropriate according to the specification conditions The sealing member may be omitted if good sealing properties can be maintained by direct contact.

Regarding the valve opening / closing force adjusting mechanism 9 and the urging force member 10, in addition to the method of linking to the spring or the weight as shown in FIGS. 2 to 7, other elastic members may be used, or the air pressure may be used. An apparatus may be used, or conversely, if the weight of each member can be accurately set and manufactured, it can of course be omitted. In addition, various design changes can be made within the scope of the present invention, such as the arrangement and combination of the components, and the prior art can be applied to each component. It is not limited to the embodiment. Industrial applicability

The present invention introduces a new pressure balance mechanism and the like that eliminates the unbalanced pressure that causes the valve body to be sucked to the valve port, drastically solves the problems of the conventional technology, and reduces the magnitude of the pressure generated in the valve box. Regardless, as the liquid level rises and falls, the float and valve body easily rise and fall to open and close the valve port, and an intake / exhaust valve that accurately performs intake and exhaust is obtained. Simultaneously satisfying the need for a lighter float to save cost and space and a larger valve port for rapid intake and exhaust, rapid intake and exhaust is possible even with a compact float. The valve opening and closing operation is smooth with no vibration, the sealing performance is good when the valve opening is closed, and there is also the advantage that clogging due to dirt, sand particles, dust, etc. is hard to occur even in the communication passage part. ing.

Furthermore, the intake / exhaust valve has a simple structure, does not have any difficulties in design, manufacture, and maintenance, and is highly reliable and economical.

Claims

The scope of the claims

1.

The lower part of the valve box (la) and the upper part of the valve box (Id) are defined by the valve box partition (lw). ), The valve box partition (lw) has a valve port (c), the valve chamber upper chamber (Id) has a vent to the outside air (d) force ^s

A float (2) provided in the lower part of the valve box (la) so as to be movable up and down;

A valve body (3) that opens and closes the valve port (c) in conjunction with the lifting and lowering movement of the float (2), and is mounted on the inner wall of the upper end of the valve box (1 e) via a sealing member (6 s) so as to be able to move up and down. A pressure receiving plate (6) having a pressure receiving area substantially equal to that of the valve body (3), wherein the pressure receiving plate (6) and the valve body (3) are connected by a connecting member (5);

The bag chamber (f) hermetically sealed between the pressure receiving plate (6) and the upper end (le) of the valve box is always connected to the lower valve chamber (1a) by the communication passage (8). The intake and exhaust valve.

2. The intake / exhaust valve according to claim 1, further comprising a valve opening / closing force adjusting mechanism (9) for adjusting the opening / closing force of the valve body (3) with respect to the valve port (c).

3. An intake / exhaust valve interposed in the liquid feed line, which opens and closes the valve opening by raising and lowering the float to intake and exhaust

The lower part of the valve box (la) and the upper part of the valve box (Id) are defined by the valve box partition (lw). ), A valve box (1) with a valve port (c) in the valve box partition (lw), and a valve box (1) with a vent (d) to the outside air in the valve chamber upper chamber (Id).

A float (2) that is provided in the lower valve chamber (1a) so as to be able to move up and down and has a specific gravity greater than that of the liquid in the liquid sending pipe; A biasing member (10) having an acting force for canceling a part of the weight of the float (2), and a valve body (3) for opening and closing the valve port (c) in conjunction with the vertical movement of the float (2). A pressure receiving plate (6) mounted on the inner wall of the valve box upper end (1 e) via a sealing member (6 s) so as to be vertically movable and having a pressure receiving area substantially equal to that of the valve body (3). (6) and the valve body (3) are connected by the connecting member (5),

The bag chamber (f) sealed and formed between the pressure receiving plate (6) and the upper end (le) of the valve box (f) always communicates with the valve box lower chamber (la) by the force communication passage (8). Features intake and exhaust valves.

4. A floating opening / closing member (13) capable of moving up and down within the gap is provided between the valve box partition (l w) having the valve port (c) opened and the valve body (3),

The floating opening / closing member (13) has a shape in which an opening near the center portion functions as a valve port that is opened and closed by the valve element (3), and a portion near the outer edge portion functions as a valve element that opens and closes the valve port (c). The valve body (3) is configured to open and close the valve port (c) via the floating opening / closing member (13). The intake / exhaust valve according to any of the above.

5. The intake / exhaust valve according to claim 4, wherein the bag chamber (f) is formed integrally with an upper part of the floating opening / closing member (13).

6. The intake / exhaust valve according to any one of claims 1 to 5, wherein a strainer (14) is attached to a fluid passage in the valve box (1).