JP2020204409A - Valve with water filling function - Google Patents

Abstract

To provide a butterfly valve being a butterfly valve with a water filling function adapted to initial water conduction which can exactly charge water by adjusting a water quantity to a proper quantity while suppressing internal consumption by maintaining low torque performance even under condition that fluid pressure differs, and can exchange an internal component.SOLUTION: A valve comprises a reduction gear 30 having an input shaft 60 and an output shaft 61, and a full-opening display part 83 indicating an opening of the output shaft 61, and an opening confirmation indicator 41a at the reduction gear 30. The full-opening display part 83 is an adjustment range display part for adjusting a valve opening range, a water filling opening range display part 85 indicated alongside the adjustment range display part 83 is arranged in a position in the vicinity of a 0% side of the adjustment range display part 83, and use-pressure value display parts 41b for making a water quantity adapted to water filling flow according to a use pressure value are indicated alongside the adjustment range display part 83 and the water filling opening range display part 85 in a state in which a water filling flow speed is set in advance.SELECTED DRAWING: Figure 5

Description

The present invention relates to a valve with a water filling function capable of supplying water at a minute opening to fill water at the time of initial water flow.

For example, when water is initially passed through a pipeline such as a water main with a butterfly valve, the water may become turbid or red water may be generated when the water flow speed is high. In order to prevent this, the bypass valve, the butterfly valve with a built-in auxiliary valve, and the butterfly valve with a water filling function are generally used for initial water flow. Of these, the bypass valve and the butterfly valve with a built-in auxiliary valve need to be filled with water while finely adjusting the valve openings of a plurality of valve bodies and the two shafts, so that advanced control is required at the time of initial water flow.
On the other hand, the butterfly valve with a water filling function can stably supply water with a small opening while operating one valve body of one valve installed in the pipeline, so that the worker can perform the initial water filling work. It will be easy. The valve body of this butterfly valve is provided with a wing portion having a special shape, and the wing portion is provided with a water passage hole, and the amount of water flow is adjusted through the water passage hole.

As a butterfly valve having a water filling function, for example, the butterfly valve of Patent Document 1 is disclosed. This butterfly valve has a valve box in which a seal ring is arranged in an annular shape and a valve body that is in sliding contact with the seal ring, and a disc tail portion is provided on the back side in the rotation direction when the valve body is opened. ing. The outer peripheral surface of the disc tail portion on the valve box seal ring side is formed to be curved in a spherical shape, and the disc tail portion is provided with an oval-shaped water passage hole for filling water. In such a butterfly valve, water is filled through the water passage hole while rotating the valve body while bringing the specially shaped wing portion into contact with the valve box side seal portion, and the space between the valve box side and the valve body is filled. In order to prevent leakage, it is often provided in a shaft core type (center type) structure, and a rubber sheet valve seat is often provided on the valve box side.

Further, as a butterfly valve of this type, for example, a butterfly valve with a water filling function of Patent Document 2 is disclosed. In this butterfly valve, a groove-shaped water passage hole is formed in the rubber valve seat seat provided in the valve box, and when the valve body is opened to a small opening, the groove-shaped water passage hole and the valve body tip side edge are formed. Water is passed from between to fill the water.

On the other hand, there is known a butterfly valve in which a valve seat made of a rubber sheet is mounted on the valve body side, and when the valve body rotates and the valve body side valve seat separates from the metal valve box side seat, a water filling function is exhibited. .. In this case, in order to prevent the amount of leakage from these gaps from suddenly increasing from the time when the valve seat on the valve body side is separated from the seat on the valve box side, the valve box side is isolated from the valve body during rotation. There is a mountain-shaped part to prevent this.

The above-mentioned butterfly valve with a water filling function is generally provided in a pipeline buried underground, and has a structure in which a rotation operation part is a cap type and a stem is rotated by a separately provided key handle. ing. In this case, an opening meter having a pointer for confirming the opening degree is provided above the deceleration portion to which the cap is attached.

Japanese Patent No. 4086495 Japanese Unexamined Patent Publication No. 2014-9745

Among the above-mentioned butterfly valves, when water is filled through the water passage hole provided on the valve body side as in Patent Document 1, water can be filled with a predetermined amount of water under the pressure condition of the preset fluid. Under pressure conditions outside the range, the amount of water flowing through the water passage holes changes depending on the pressure, making proper filling difficult. Therefore, when the pressure of water is low, the appropriate amount of water may not be filled, and when the pressure of water is high, the amount of water may be larger than the appropriate amount of water. If the valve opening degree is adjusted to prevent these, the flow rate changes abruptly when the valve opening is out of the water flow region of the water passage hole, so that it is difficult to adjust the filling amount with such different fluid pressures.

Furthermore, since a specially shaped wing is provided on the valve body side, this wing rotates while constantly in contact with the rubber sheet on the valve box side, eliminating the gap between the valve body side and the valve box side, allowing water to pass through when filling. The contact range with the rubber sheet is lengthened in order to secure the amount of water flowing only through the water holes. As a result, the operating torque increases and the rubber sheet wears faster. Further, when a rubber sheet is provided on the valve box side as in Patent Document 1 and Patent Document 2, since it is often fixed by vulcanization adhesion or epoxy filling, the rubber sheet cannot be removed after fixing, resulting in damage. Even if it happens, it is difficult to replace it. For this reason, it may be necessary to replace the entire valve.

On the other hand, when the rubber sheet is attached to the valve body side, the rubber sheet can be replaced, but the amount of leakage increases due to the separation due to the rotation of the valve body, which makes it difficult to set the flow rate required for filling. Become. If a mountain-shaped portion is provided on the valve box side in order to solve this problem, the pressure loss may increase due to the influence of the protruding portion, or foreign matter or the like may be caught in the mountain-shaped portion.
In order to reduce the amount of leakage, wing-shaped parts may be formed on the metal parts corresponding to the front and back parts of the rubber sheet in the valve body, and the wing-shaped parts may reduce the gap with the metal valve seat part on the valve box side. In this case, the assembly accuracy when combining other parts on the front or back of the valve body deteriorates, and there is a possibility that it will come into contact with the metal valve seat or the gap will become large and the required water flow rate will not be achieved. .. In particular, in the valve body of a butterfly valve for water supply, ductile cast iron is coated with resin powder, and the coating film is thickly provided, and the thickness also varies, so that the assembly accuracy is further deteriorated. Even when no separate parts are assembled to the valve body, it is necessary to provide a gap so that the blade does not come into contact with the metal valve seat on the valve box side in consideration of the variation in the coating thickness of the spherical portion of the blade. Leakage may increase and the filling performance may deteriorate, or the performance may differ for each butterfly valve after assembly.

Further, since the display unit for checking the opening degree shows a region suitable for normal water filling under a pressure condition in a preset range, the amount of water flow can be increased under a pressure condition outside the set range as described above. The change makes it difficult to fill with water while adjusting it accurately.

The present invention has been developed in order to solve the above problems, and an object of the present invention is a butterfly valve with a water filling function suitable for initial water flow, even under conditions where the fluid pressure is different. It is an object of the present invention to provide a butterfly valve with a water replenishing function, which can maintain low torque and suppress internal consumption, adjust the amount of water to an appropriate level, accurately replenish water, and replace internal parts.

In order to achieve the above object, the invention according to claim 1 is a speed reducer having an input shaft and an output shaft, and the speed reducer has a total opening degree display unit indicating the opening degree of the output shaft and a guideline for checking the opening degree. The full opening degree display unit is an adjustment range display unit for adjusting the valve opening degree range, and the position near the 0% side of the adjustment range display unit is also written on the adjustment range display unit. In addition to providing a filling opening range display unit, the adjustment range display unit and the filling opening opening range display unit are suitable for filling water according to the working pressure value with the filling flow velocity set in advance. It is a valve with a water filling function that is configured with a working pressure value display for flowing the amount of water.

According to the invention of claim 1, the amount of water and the valve opening suitable for the working pressure value can be confirmed by the display unit provided on the operation unit, and the valve opening degree is adjusted according to the working pressure value while visually recognizing the display unit. By doing so, it becomes possible to accurately pass water at a flow velocity suitable for initial filling, and the opening and pressure values for flowing the amount of water suitable for filling according to the working pressure value on the display unit. Areas with and are also written, enabling intuitive operation.

It is a partial notch side view of the butterfly valve with a water filling function which is an example of this invention. It is a cross-sectional view of a valve body. (A) is a front view of the valve seat retainer. (B) is a cross-sectional view of the valve seat retainer. (C) is a left side view of (a). (A) is a front view of a valve body. (B) is a cross-sectional view of the valve body. (C) is a bottom view of (a). (D) is a right side view of (a). It is a top view which shows the display part. FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG. It is sectional drawing which shows the state which the valve body of FIG. 6 opened. It is sectional drawing which shows the state which the valve body of FIG. 7 opened. It is sectional drawing which shows the state which the valve body of FIG. 8 opened. It is sectional drawing which shows the state which the valve body of FIG. 9 opened. It is a graph which shows the loss coefficient with respect to a valve opening degree. It is a graph which shows the effective flow rate characteristic with respect to a valve opening degree. It is a graph which shows the differential pressure with respect to the valve opening degree at a constant flow rate. It is a top view which shows the 2nd example of the display part. It is a front view of a speed reducer. It is a separated front view of the speed reducer of FIG. It is a cross-sectional view of the reduction gear of FIG. It is a top view which shows the 3rd example of a display part. It is a top view which shows the 4th example of the display part.

Hereinafter, an embodiment of a butterfly valve with a water filling function, which is an example of the present invention, will be described in detail with reference to the drawings. FIG. 1 shows a partially cutaway side view of the butterfly valve with a water filling function, and FIG. 2 shows a cross-sectional view of the valve body.

The butterfly valve with a water filling function (hereinafter referred to as valve body 1), which is an example of the present invention, is mainly arranged in a water pipe (not shown) and used for initial water filling. The valve body 1 is provided in a unieccentric structure, and a valve body 3 is provided inside the valve box 2. The valve body 3 includes a valve body 10, a valve seat 11, a valve seat retainer 12, and a spacer 13. Have. At both ends of the valve box 2, joint portions 14 for connecting the pipeline, which are flange portions, are provided.

The valve box 2 is formed of a metal material, and a coated portion 15 by epoxy powder coating is applied to the surface thereof with a thickness of, for example, about 0.3 mm to 1 mm, while the inside of the valve box 2 is made of metal. The valve seat surface 16 is integrally formed. Corrosion resistance and wear resistance are improved by subjecting the valve box side valve seat surface 16 to a plating treatment such as hard chrome plating, and the dimensional accuracy is also improved. The valve seat surface 16 may be provided by thermal spraying or the like.

In FIGS. 4A to 4D, the valve body 10 is formed in a substantially disk shape by, for example, ductile cast iron such as FCD450-10, and the insertion hole 20 for mounting the valve stem and the valve seat in FIG. The concave groove 21 for mounting 11 is formed on the outer diameter side, and the valve seat 11 mounting position of the valve body 3 is provided in a unieccentric structure offset from the center P of the valve stem 17. The valve body 10 has a chevron-shaped spherical outer peripheral portion 23 protruding from the valve blade side, which is different from the spherical outer peripheral portion 22 described later of the valve seat retainer 12, when viewed from the center P side of the valve rod 17. The surface of the outer peripheral portion 23 forms a part of a spherical surface with a radius from the center P of the valve shaft. The valve stem 17 is arranged at the center of the diameter of the valve box 2.

A plurality of substantially V-shaped comb-shaped grooves 24 are formed in the spherical outer peripheral portion 23, and by providing the comb-shaped grooves 24, the valve body 3 of the spherical outer peripheral portion 23 is a valve rod ( As shown in FIG. 4D, when the valve shaft) 17 is rotated by a certain angle, the valve seat surface 16 is formed in an arc shape so that the overlaps with the valve seat surface 16 are simultaneously (mutually) disengaged. In addition to the present embodiment, the surface shape of the spherical outer peripheral portion 23 may be a shape in which the overlap with the valve seat surface changes depending on the required flow rate characteristics.

In FIGS. 1 and 2, the valve seat 11 is formed of a soft material such as rubber into an integrated ring shape having no cut portion, and a fitting protrusion 25 that fits into the concave groove 21 protrudes on the inner diameter side. By doing so, it is provided in a substantially L-shaped cross section. With the valve seat 11 fitted to the valve body body 10, the valve seat retainer 12 is mounted on the valve body body 10 with a fixing bolt 27 via a washer 26. As a result, the valve seat 11 is detachably provided by loosening the fixing bolt 27 and removing the valve seat retainer 12.

A plurality of spacers 13 are interposed between the valve body body 10 and the valve seat retainer 12. The spacer 13 is formed in a washer shape with an appropriate thickness that can be sandwiched between the valve body body 10 and the valve seat retainer 12, and is fixed between them by the fixing bolt 27. By providing this spacer 13, the tightening amount of the valve body 10 and the valve seat retainer 12 by the fixing bolt 27 can be adjusted, and the height of the valve seat retainer 12 is adjusted according to the tightening amount of the spacer 13. Positioning in the direction, positioning in the radial direction, and the amount of crushing of the valve seat 11 can be set.

In FIGS. 2 and 3 (a) to 3 (c), the valve seat retainer 12 is a bronze casting such as CAC406 plated, a stainless casting such as SCS, or a machined stainless steel material. It is formed in a ring shape due to such factors, and has excellent rust prevention properties and can suppress adverse effects on water quality. In FIG. 2, when the contact surface with the valve body 10 is the lower surface of the valve seat retainer 12, a chevron-shaped wing-shaped spherical outer peripheral portion 22 forming a part of the spherical surface is formed on one valve wing side of the upper surface. Has been done. As shown in FIG. 3, a plurality of groove portions 30 are provided on the outer peripheral portion 22 of the spherical surface, and each groove portion 30 has a spherical bottom portion 31 having a center point C different from the center point B of the outer peripheral portion 22 of the spherical surface. ing. The bottom portion 31 is formed in a smooth spherical shape so that the groove depth becomes deeper toward the apex of the outer peripheral portion of the spherical surface. By providing a plurality of groove portions 30, the flow of water when the valve is opened is dispersed, and turbulence is less likely to occur.
Assuming that the radius of the spherical outer peripheral portion 22 at the center point B is R1 and the radius of the spherical bottom portion 31 at the center point C is R2, the relationship of radius R1 <radius R2 is set.

Similar to the valve body body 10 described above, the surface shape of the spherical outer peripheral portion 22 has a valve seat surface 16 as shown in FIG. 3C when the valve body 3 is rotated by a constant angle about the valve shaft P. It is formed in an arc shape so that the overlaps with and overlap with each other at the same time (mutually). Further, the surface shape may be such that the overlap with the valve seat surface 16 changes according to the required flow rate characteristics.

As shown in FIG. 3A, a plurality of through holes 32 are formed at the attachment positions of the valve seat retainer 12 with the valve body body 10, and the valve is shown in FIG. 3B following the through holes 32. A counterbore hole 33 is formed on the lower surface side of the seat retainer 12, and the spacer 13 is housed in the counterbore hole 33 in a press-fitted state. Further, on the lower surface side of the valve seat retainer 12, an annular groove 35 for mounting the O-ring 34 for sealing with the valve body body 10 and a V-shaped groove 36 for suppressing slippage when the valve seat 11 is mounted are formed, respectively. ..

The spherical outer peripheral portion 23 and the valve seat surface 16 have a substantially constant gap during the valve opening operation of the valve body body 10, and the spherical outer peripheral portion 23 and the valve seat surface 16 have a substantially constant gap S. At this time, the spherical outer peripheral portion 22 and the valve seat surface 16 have a clearance C that gradually expands.
As a result, the valve body body 10 is gently filled with water from the minimum opening to the small opening formed by the spherical outer peripheral portion 22, the spherical outer peripheral portion 23, and the metal valve seat surface 16. A region is provided that exhibits various flow rate change characteristics.
In the valve body 1 of the present embodiment, the spherical outer peripheral portion 22 is provided as the orifice side, and the spherical outer peripheral portion 23 is provided as the nozzle side.

In FIG. 1, an operation unit 40 having a speed reducer 39 inside is connected to a valve rod 17 for operating the valve body 3 of the valve body 1, and the operation unit 40 (reducer 39) is shown in FIG. A display unit 41 is provided. The display unit 41 is marked with an opening degree and a pressure value for flowing a water amount suitable for filling according to the working pressure value, so that an intuitive operation is possible.

In the present embodiment, the target flow velocity at the time of filling is set to 0.5 m / s, and in order to satisfy this target flow velocity, the valve opening is 15% when the water pressure is 7.5 K and the pressure is 4 K. The valve capacity is set to 20% when the valve opening is 20% and the valve opening is 25% when the pressure is 1K, and a display unit 41 having a scale corresponding to these is provided. By adjusting the valve opening while visually recognizing the display unit 41 having the pointer 41a for checking the opening degree, the target valve opening degree is adjusted according to the pressure of water displayed on the working pressure value display unit 41b. Water can be passed at a target flow velocity of 0.5 m / s. The target flow velocity at the time of filling can be appropriately set, and for example, it is desirable to set it within the range of 0.3 m / s to 0.5 m / s. In this case, it can be dealt with by changing the scale of the display unit 41 according to the target flow velocity.

When assembling the valve body 3, in FIG. 2, the valve seat 11 is fitted into the concave groove 21 of the valve body body 10 so as to be fitted, and the spacer 13 is press-fitted into the counterbore hole 33 with respect to the valve body body 10. A valve seat retainer 12 having an O-ring 34 attached to the annular groove 35 is attached to the annular groove 35 with an adhesive or an adhesive, and these are fixed with a fixing bolt 27 via a washer 26. At this time, the valve seat 11 can be tightened with an appropriate tightening amount by the spacer 13, and the contact portion of the valve seat 11 on the valve seat surface 16 side can be positioned with high accuracy. The V-shaped groove 36 prevents the valve seat 11 from slipping and can be arranged concentrically with the valve body 10, and the valve seat retainer 12 can be attached while preventing the spacer 13 from falling off, so that workability during assembly is improved. improves.
Since the spherical outer peripheral portion 22 and the spherical outer peripheral portion 23 are arranged adjacent to the valve seat 11 in close contact with each other, it is possible to exhibit a gentle flow rate change characteristic suitable for initial water filling from a minimum opening degree.

In the above embodiment, the spherical outer peripheral portion 22 is on the orifice side and the spherical outer peripheral portion 23 is on the nozzle side, but the rotation direction of the valve body 3 is a constant direction, that is, in the present embodiment, it is counterclockwise in FIG. If it rotates, it can be used in reverse.

In the valve body 3, the groove portion 30 is formed in the valve seat retainer 12, and the comb-teeth-shaped groove 24 is formed in the valve body body 10. However, depending on the required flow rate characteristics and the like, these may be combined in reverse. May be provided in the same shape.

Since the valve seat retainer 12 is easier to process as a part than the valve body body 10, it can be processed into a shape in which the flow rate can be finely adjusted by increasing the opening degree. In the above embodiment, the groove portion 30 of the valve seat retainer 12 is provided in a simple parallel state and the depth direction is provided in a spherical shape (cross-sectional arc shape), but the groove portion 30 is provided according to the required flow rate characteristics and the like. It can be finely processed to be provided in a finer groove or formed into a V shape. As for the depth direction (cross-sectional direction) of the groove portion 30, it is possible to change the flow rate characteristic in a step shape by making it shallow or stepped, and it can be formed into various shapes according to the installation conditions and the like. ..

If the valve seat retainer 12 is provided in a simple washer shape and the spherical outer peripheral portion 22 can be retrofitted to the valve seat retainer 12, parts can be replaced more easily to change the flow rate characteristics. When the water function is not required, the spherical outer peripheral portion 22 can be removed to use it as a normal butterfly valve, and a valve having characteristics with low loss can be provided.

Further, the spacer 13 between the valve seat retainer 12 and the valve body body 10 can be applied even when it does not have a water filling function, and can be used for various valves.

The display unit 41 can be applied even when the aspect of the valve body 1 is different as long as it indicates a region of the amount of water suitable for filling according to the working pressure. In addition to the unieccentric structure of the present embodiment, the display unit 41 can be applied. For example, it can be used for other eccentric butterfly valves, shaft core butterfly valves, and various other valves having various operation units and opening meters.

Although not shown, the joint portion 14 on both ends of the valve body 3 is not limited to the flange shape, and may be provided in a seismic joint or various other shapes.

Next, the operation and operation of the butterfly valve with a water filling function described above will be described.
Normally, the valve body 1 of the present invention is operated from a state in which the upstream side pipeline is filled with water in a fully closed state and the secondary side pipeline is empty. In this case, if the water is suddenly refilled, the pipe may be damaged due to a water hammer or the like when the water is full. Therefore, the water refilling function is exhibited while passing water with an appropriate amount of water.

FIG. 6 shows the valve closed state of the valve body 1. In the figure, the upstream side on the left side of the valve body 3 is filled with water, and the downstream side on the right side of the valve body 3 is in a state without water. There is. At this time, on the upstream side, the valve seat 11 is in compressive contact with the valve seat surface 16 to ensure that the water is stopped.

FIG. 7 shows a state in which the valve body 3 is opened by 6% (about 5 degrees) of the whole from the state of FIG. At this time, due to the flow of water from the left side to the right side in the figure, the spherical outer peripheral portion 22 side becomes the orifice side, the spherical outer peripheral portion 23 side becomes the nozzle side, and the spherical outer peripheral portion 22 and the spherical outer peripheral portion 23 are valves, respectively. Confront the seat surface 16. In this case, when the valve seat 11 is separated from the valve seat surface 16, a substantially constant clearance S is provided between the spherical outer peripheral portion 23 and the valve seat surface 16, and the spherical outer peripheral portion 22 and the valve seat surface 16 are provided with a substantially constant gap S. A clearance C is provided between them, and water is passed between the gap S and the clearance C. In this case, the clearance C is the sum of the gap between the surface of the outer peripheral portion 22 of the spherical surface and the valve seat surface 16 and the gap due to the cross section of the groove portion 30.

FIG. 8 shows a state in which the valve body 3 of FIG. 7 is rotated and opened by 17% (about 15 degrees) of the whole. At this time, the amount of the gap S between the spherical outer peripheral portion 23 and the valve seat surface 16 and the gap between the spherical outer peripheral portion 22 surface and the valve seat surface 16 do not change from the state of FIG. 6, and the groove 30 cross section of the spherical outer peripheral portion 22 remains unchanged. The amount of clearance C increases by the amount of increase in the depth of the water, which increases the amount of water flow.
Shortly before the state shown in FIG. 8, specifically, with a valve opening of 15%, the gap S and clearance C, particularly, so that the filling flow velocity at a water pressure of 7.5 K is 0.5 m / s. The cross-sectional area of the groove 30 of the clearance C is set.

FIG. 9 shows a state in which the valve body 3 rotates from the state of FIG. 8 and opens 24% (about 22 degrees) of the whole. At this time, in addition to the amount of water flowed in the case of FIG. 8, the amount of water flowed from the comb-shaped groove 24 of the spherical outer peripheral portion 23 is added to the amount of water flowed.

Shortly before the state of FIG. 9, specifically, when the valve opening is 20%, the gap S and the clearance C, particularly the clearance C, are set so that the filling flow velocity at a water pressure of 4K is 0.5 m / s. The cross-sectional area of the groove portion 30 of the above is set. When the valve opening degree exceeds 20%, water is filled by the gap S including the comb-shaped groove 24.

When the valve opening degree exceeds 22%, the spherical outer peripheral portion 22 deviates from the position facing the valve seat surface 16.
Further, a little after the state of FIG. 9, specifically, in a state where the valve opening is 25%, the gap S, particularly the comb-teeth shape, is set so that the filling flow velocity at a water pressure of 1 K is 0.5 m / s. The cross-sectional area of the groove 24 is set.

FIG. 10 shows a state in which the valve body 3 rotates from the state of FIG. 9 and opens 39% (about 35 degrees) of the whole. In this case, the entire spherical outer peripheral portion 23 deviates from the valve seat surface 16 from the state of FIG. 9, so that the amount of water flow further increases. Further, when the valve is opened from this state, it exhibits the same characteristics as the change in the amount of water with the normal butterfly valve.

Prior to the state of FIG. 10, specifically, when the valve opening degree exceeds 30%, the comb-teeth-shaped groove 24 is set to be separated from the position facing the valve seat surface 16.

As described above, a region exhibiting a gentle flow rate change characteristic suitable for initial water filling can be obtained between the minimum opening degree and the small opening degree in FIGS. 7 to 10.

The relationship between the operating angle of the valve body 3 and the amount of water flowing therethrough is an example in design, and the area through which water is passed can be arbitrarily set for each operating angle of the valve body 3. Therefore, the length of the spherical outer peripheral portion 23 and the spherical outer peripheral portion 22 in the circumferential direction, the height in the flow path direction, and the like can be appropriately set according to the relationship between the rotation angle of the valve body 3 and the amount of water flow. In this case, for example, when the spherical outer peripheral portion 23 or the spherical outer peripheral portion 22 is formed large, the flow rate can be changed little by little to perform a fine water filling operation, and when the spherical outer peripheral portion 23 or the spherical outer peripheral portion 22 is formed small, the loss when the valve body 3 is fully opened can be reduced. Therefore, the optimum valve body can be configured according to the conditions of the flow path while considering the balance of these characteristics.
Further, the same water filling performance can be exhibited even when the flow is in the opposite direction to the above embodiment.

As described above, in the butterfly valve with a water filling function of the present invention, the valve body 10 is provided with an eccentric valve body 3 in which the rubber valve seat 11 is attached by the valve seat retainer 12, and the valve seat retainer 12 is provided with a wing shape. A plurality of groove portions 30 having a spherical outer peripheral portion 22 and a spherical bottom portion 31 are provided, and a wing-shaped spherical outer peripheral portion 23 and a plurality of comb-shaped grooves 24 are provided on the valve body body 10, and the spherical outer peripheral portion 22 and the spherical outer circumference are provided. A region is provided between the minimum opening and the small opening formed by the portion 23 and the valve seat surface 16 on the valve box side to exhibit a gentle flow rate change characteristic suitable for initial water filling. As a result, the change in the amount of water after the valve seat 11 is separated from the valve seat surface 16 during three rotations of the valve body in the small opening region from the valve closing corresponds to the change in the depth of the groove 30 cross section of the valve seat retainer 12. It increases gently. After that, it is gently connected to the water flow region of the comb-shaped groove 24 of the valve body body 10, and the amount of water flow through the comb-shaped groove 24 also changes gently.

At this time, the clearance C between the spherical outer peripheral portion 22 and the valve seat surface 16 gradually expands while maintaining a small gap S between the spherical outer peripheral portion 23 and the valve seat surface 16, so that the valve is described above. The flow rate can be gradually changed from a low opening degree by a series of operations of the body 3, and a sudden increase in the flow rate due to a large gap at the moment when the valve seat 11 is separated can be surely prevented.
Since the characteristics of such a flow rate change are exhibited, it is possible to easily adjust the amount of water suitable for safe filling of the pipeline even when the operating pressure conditions are different.

Since the valve seat 11 is mounted on the valve body 10 side, there is no possibility that the valve seat 11 will come into contact with the valve seat surface 16 when adjusting the filling amount, and as a result, the operating torque when adjusting the filling amount is light. This also prevents the rubber valve seat 11 from being worn or damaged.

Since the valve seat retainer 12 is an assembled part, even if the required characteristics change according to the operating conditions at the site, different flow rate characteristics can be obtained simply by replacing the parts without replacing the entire valve body 1. be able to.

By providing the spacer 13 between the valve body body 10 and the valve seat retainer 12, the valve seat retainer 12 can be mounted while easily adjusting the position with high accuracy, and can be tightened with a tool such as a torque wrench. It is not necessary to assemble the valve seat retainer 12 while adjusting it, or to adjust the tightening degree uniformly in a circumferential shape to adjust the amount of protrusion of the valve seat 11.

Subsequently, the flow rate characteristics during operation of the valve body 1 will be described with reference to the graph.
The graph of FIG. 11 shows the change in loss with respect to the change in valve opening of various butterfly valves, and compares the general-purpose butterfly valve with the conventional butterfly valve with water filling function and the butterfly valve with water filling function this time. It was done. Here, in the following figures (graphs), the "general-purpose butterfly valve (without water filling function)" is a butterfly valve without a general water filling function, and is a "conventional design butterfly valve with a water filling function". "Is a butterfly valve having a water filling function having a conventional general structure, and the "butterfly valve with a water filling function this time" means a butterfly valve with a water filling function in the present invention.

In FIG. 11, when the change in loss is large with respect to the amount of change in opening degree, the operability is deteriorated for fine adjustment. In the conventional butterfly valve with a water filling function, a constant region with no change in loss is provided at a small opening (approximately 10 to 25%), but before and after this small opening region, the present Compared to the butterfly valve with a water filling function of the present invention, the change in the loss coefficient with respect to the change in opening degree becomes more rapid. On the other hand, the butterfly valve with a water filling function of the present invention has less change in loss with respect to the amount of change in the opening degree than the butterfly valve with a water filling function of the conventional design, and is excellent in operability when finely adjusting the opening degree. It can be said that it is.

In particular, the region where the gentle flow rate change characteristic is exhibited means that the loss coefficient in the filling region is not constant, and there is no sudden change in the loss coefficient curve in the region above the other butterfly valves (large loss coefficient). ..

FIG. 12 shows curves of effective flow rate characteristics of various butterfly valves. In this case, the flow rate that flows when fully opened is set to 1, and the ratio of the amount that flows for each opening degree is shown. The characteristics of the flow rate that flows by the actual operation of the butterfly valve change due to the loss of the pipeline before and after this valve. This effective flow rate characteristic is a graph that takes into account not only the valve itself but also the loss of the pipeline.
In this graph, in the butterfly valve with a water filling function of the conventional design, there is a region where the flow rate is constant even if the opening is changed, and before and after that, the opening changes as compared with the butterfly valve with a water filling function this time. The change in flow rate is rapid.
On the other hand, in the butterfly valve with a water filling function of the present invention, the flow rate surely increases according to the change in the opening degree of the valve, and it can be said that the flow rate surely increases even in the vicinity of a small opening degree to a small opening degree. ..

In particular, in FIG. 12, the region exhibiting the gentle flow rate change characteristic suitable for the initial filling is in the filling region from the minimum opening (for example, about 5%) to the small opening (for example, about 25%). A region in which the flow rate characteristic is not a constant flow rate but is smaller than the amount of change in the valve opening after the filling region.

FIG. 13 shows the relationship between the valve opening degree and the differential pressure of various butterfly valves when the flow velocity is constant. In this case, the opening degree was calculated by setting the flow velocity for safely filling water to 0.3 m / sec.
From the results of the graph in the figure, it can be said that the butterfly valve with a water filling function of the conventional design has an opening degree in a constant flow rate region (opening degree of about 10 to 25% in this example) when the differential pressure is 0.5 MPa. As a result, it is necessary to adjust the flow rate by adjusting the opening degree in areas other than this region (differential pressure), and at that time, it is necessary to adjust the flow rate with a finer opening degree than the butterfly valve with the water filling function of the present invention. Will also be difficult.

As mentioned above, the conventionally designed butterfly valve with water filling function functions in a constant flow rate range under the designed pressure conditions, but may cause inconvenience for operating pressures that differ depending on the actual field site. is there. As a countermeasure for this, for example, it is conceivable to manufacture a product in which the size of the water filling hole is changed, but the reality is that it is necessary to change the size of the water filling hole each time according to the different environment for each site. Not the target.

On the other hand, the butterfly valve with a water filling function of the present invention can exhibit a highly accurate water filling function even under different water pressure conditions as described above, and in particular, from a minute opening at the time of initial water flow. Even in the vicinity of a small opening, the amount of water can be adjusted to an appropriate level to allow accurate water flow and stable water filling.

Next, another example of the above-mentioned display unit used for the butterfly valve with a water filling function of the present invention and a water filling method of the butterfly valve with a water filling function using this display unit will be described.
Here, as a specific example of the display unit, for example, a valve with a minute opening degree display function disclosed in Japanese Patent Application Laid-Open No. 2016-11666 is known. The opening degree display mechanism of the valve body includes an opening degree scale portion indicating the opening degree of the valve body and an opening degree pointer portion indicating the opening degree scale portion of the opening degree scale portion. The opening scale has a total opening display scale that displays the valve body opening corresponding to the rotation angle of the output shaft carrier in the entire opening range of the valve body, and a valve body opening that slightly opens corresponding to the rotation angle of the input shaft. It has a minute opening display scale that displays in the degree range. The opening pointer section is a full opening pointer that indicates the opening of the valve body on the full opening display scale in synchronization with the rotation of the output shaft carrier, and the valve body on the minute opening display scale that is synchronized with the rotation of the input shaft. It has a minute opening pointer that indicates the opening.

In this valve, a minute opening pointer constituting a minute opening display unit is mounted on an input shaft, and a total opening display unit consisting of a full opening display scale and a total opening guide is arranged at an outer peripheral position of the minute opening pointer. A minute opening scale is arranged at the outer peripheral position of the full opening display unit so as to sandwich the full opening display unit. In this case, a special name plate on which the full opening scale and the minute opening scale are displayed is required, and it becomes difficult to attach the name plate to the existing butterfly valve with a water filling function buried underground.

Since the minute opening display unit is configured to sandwich the total opening degree display unit, it becomes difficult to grasp the minute opening degree, and since the total opening degree display unit is located at the nearest position indicated by the minute opening degree pointer, the operator can use it. There is a possibility that the minute opening and the full opening display may be confused and recognized. Further, there is a problem that two types of scales and pointers each including a full opening degree display scale, a minute opening degree display scale, and a full opening degree guideline and a minute opening degree guideline are required.

The minute opening scale is arranged on one scale plate together with the full opening display scale and the flow rate display scale, and this scale plate is fixed to the upper surface side of the case of the speed reducer. The minute opening pointer is attached to an arbitrary rotation position of the input shaft and is rotated synchronously with the input shaft, and the opening is confirmed while checking the rotation angle of the input shaft from an arbitrary reference position. In this case, the position of the minute opening scale cannot be adjusted, and when checking the minute opening, the rotation state of the small minute opening pointer located at a position away from the fully closed minute opening scale is visually recognized. Especially, it is difficult to see under underground burial.

Further, although not shown, for example, if the minute opening scale of the valve described in Japanese Patent Application Laid-Open No. 2016-11666 is arranged inside, the visibility can be improved. However, even in that case, it is insufficient for the fine adjustment work of the minute opening.

On the other hand, FIG. 14 shows a second example of the display unit of the valve of the present invention. Similar to the display unit of FIG. 5, the display unit 51 is provided so as to be attached to the operation unit 40 (reducer 30), and a region having an opening degree for flowing an amount of water suitable for filling is marked.

Here, first, the speed reducer 30 will be described. 15 to 17, the speed reducer 30 has an input shaft 60, an output shaft 61, a speed reduction mechanism 62, and a cap 63, and is rotated by a key handle (opening key) (not shown), and the rotational force thereof is capped. It is input to the input shaft 60 via 63, the rotation of the input shaft 60 is decelerated by the speed reduction mechanism 62, output from the output shaft 61, and transmitted to the valve rod 17.

The reduction gear mechanism 62 includes a differential gear mechanism having an external gear 70, an internal gear 71, an eccentric cam 72, and a pin 73, and a predetermined reduction ratio is set by the difference in the number of teeth between the external gear 70 and the internal gear 71. The speed reducer 30 used in this example is provided by a combination of gears in which the input shaft 60 and the output shaft 61 rotate in the same direction, and the output shaft 61 also rotates clockwise due to the clockwise rotation of the input shaft 60. At this time, the valve is opened. From this, the input shaft 60, the display member 80 described later that rotates in synchronization with the input shaft 60, and the full opening pointer portion 81 rotate in the same direction, so that the visibility is excellent and intuitive. Operation becomes possible. As described above, it is desirable that the reduction mechanism 62 is a gear mechanism in which the input shaft 60 and the output shaft 61 rotate in the same direction. Further, with such a structure, the deceleration mechanism 62 exerts a so-called self-locking function, prevents rotation due to fluid pressure, and can reliably transmit the operating force to the valve body body 10 of FIG.

The cap 63 shown in FIGS. 14 to 17 is integrally attached to the upper end portion of the input shaft 60 by fitting. The cap 63 may have a structure called a so-called slip cap. In this case, when an excessive torque is applied from the input side, the cap 63 slips on the input side and the rotation transmission to the input shaft 60 is cut off. When a slip cap is used, an excessive rotational force is transmitted to the input shaft 60 even when an operation torque larger than necessary is applied in a state where the nominal diameter of the valve body 1 in FIG. 1 is difficult to understand due to burying or the like. Since there is no torque, safe rotation operation is possible. Further, it is possible to select caps having different slip torques according to the torque required for operating the valve body 1.

As shown in FIG. 14, on the upper surface of the speed reducer 30, an annular name plate 82 is provided on the outer peripheral side thereof by a material such as SUS, and an annular display member 80 is arranged inside the name plate 82. In this example, the full opening degree display unit 83 is written on the name plate 82, and the minute opening degree display unit 84 is written on the display member 80. As described above, the display unit 51 has the full opening degree display unit 83 and the minute opening degree display unit 84. It is equipped. Further, the name plate 82 may be marked with a nominal pressure, a maximum permissible pressure, a maximum flow velocity, a year of manufacture, and the like (not shown). Here, the "full opening degree display" is the opening degree display of the output shaft 61 from the valve closing to the valve opening during the valve body operation, while the "small opening degree display" is the input side display during the valve body operation. It means the opening degree display respectively. The "total opening degree display" can be displayed by the name plate 82 and the full opening degree pointer unit 81, and the "small opening degree display" can be displayed by the name plate 82 and the display member 80.

In the full opening degree display unit 83, the valve body opening degree from the valve closed state (valve body angle 0 °) to the valve open state (valve body angle 90 °) is marked over a range of 90 ° of the name plate 82 by a scale or a numerical value. A filling opening degree range display unit 85, which is a range of valve opening degrees suitable for filling water, is also written on the total opening degree display unit 83. On the 180 ° opposite side of the full opening degree display unit 83 of the name plate 82, a rotation speed display unit 86 for displaying the rotation speed of the input shaft 60 is written over a range of 90 °, similarly to the full opening degree display unit 83.

In FIG. 17, an opening shaft 90 is coaxially attached to the upper portion of the output shaft 61, and the full opening pointer portion 81 is integrally rotatably fitted to the upper portion of the opening shaft 90. In the full opening pointer section 81, the pointer 81a is formed so as to project at two points in the circumferential direction at intervals of 180 °, one pointer 81a points to the full opening display section 83, and the other pointer 81a points to the rotation speed display section 86. It is installed like this. With this configuration, the opening degree of the "full opening degree display" can be confirmed by visually recognizing the relationship of each pointer 81a with respect to the full opening degree display unit 83 and the rotation speed display unit 86.

The minute opening degree display unit 84 is arranged on the upper surface of the display member 80 which is the inner side of the full opening degree display unit 83, and has an equally divided scale 84a. Due to the relationship with the scale 84a, the total opening degree display unit 83 The minute opening in is displayed. In this example, the scale 84a is described by dividing 360 ° into 16 parts, and when the scale 84a is finely divided in this way, fine adjustment during rotation of the input shaft 60 becomes easy. For example, when 360 ° is engraved in multiples of 4 such as 1/4 rotation, 1/8 rotation, and 1/16 rotation as the scale step of the input shaft 60 of 1 rotation or less, the minute opening display unit 84 It is easy to intuitively visually recognize the rotation state of the valve, and in particular, as shown in the figure, when the step is divided into steps every 1/16 rotation, the step of the amount of change in the Cv value of the valve can be adjusted more finely. It becomes. On the scale 84a, numbers from 0 (zero) to 15 are written in order.

The display member 80 provided with the minute opening degree display unit 84 is mounted on the upper surface of the annular plate member 87 having an appropriate thickness and integrated, and is provided so as to be adjustable in position with respect to the input shaft 60 in the circumferential direction. On the other hand, on the name plate 82 provided with the full opening degree display unit 83, a zero point display unit 91 indicating the leakage position of the valve, which is the start position, is written. The zero point display unit 91 in the present embodiment also serves as a display of an opening degree of 0% indicating the position of the valve closed state (valve body opening degree of 0 °). As described above, since the total opening degree display unit 83 has the function of the scale pointed by the total opening degree pointer unit 81 and the function of the pointer indicating the scale 84a of the minute opening degree display unit 84, the minute opening degree pointer Is not required separately.

Subsequently, a method of filling the valve body 1 using the above-mentioned display unit 51 will be described.
When the display unit 51 is provided on the speed reducer 30, first, the name plate 82 is attached to the upper surface of the operation unit 40 of the valve body 1 in FIG. 1 in the valve closed state in a predetermined direction, and the total opening pointer unit is mounted from above the opening shaft 90. 81 is integrally attached by fitting. Next, the plate member 87 having the display member 80 mounted on the upper portion is fitted from below the cap 63, and the cap 63 and the plate member 87 (display member 80) are attached from above the input shaft 60 in a temporarily assembled state. The cap 61 (input shaft 60) is operated to fully close the valve, and the pointer 81a of the full opening pointer section 81 is aligned with the zero point display section 91 of the full opening display section 83. At this time, the pointer 81a on the other side of the full opening pointer unit 81 is adapted to the zero position of the rotation speed display unit 86.

With the water pressure applied to the valve body 1, the cap 63 (input shaft 60) is operated in the opening direction to operate the valve body 10 to the water leakage position. Due to the rotation of the valve body body 10, each pointer 81a is slightly advanced from the zero state.
In this state, the free display member 80 (plate member 87) is rotated, the zero number is aligned with the zero point display unit 91 of the name plate 82, and the display member 80 and the cap 63 are fixed to fix the input shaft. The 60 (cap 63) and the display member 80 can rotate in a synchronized state. With this configuration, when the valve body 10 of FIG. 1 is rotated, the leakage position of the valve body 1 which is the water filling start position is specified as the water filling start position, and the water filling start position is set as the zero point to fill the water. Water can be filled while displaying a region of the amount of water suitable for filling with a minute opening via the opening range display unit 85.

As described above, by displaying the minute opening degree in the total opening degree display unit 83 of the display unit 51 on the minute opening degree display unit 84 arranged inside the total opening degree display unit 83, a special name plate is not provided. , Assembly error, adjustment error, individual difference in opening opening due to crushing of valve seat 11, etc. are eliminated, and the valve body opening at the start of water flow is set as the zero point, and the total opening opening display unit 83 is minute. An accurate opening degree can be displayed via the opening degree display unit 84. That is, while confirming that the water is filled by the state of each pointer 81a of the total opening pointer 81 to the filling opening range display unit 85 (total opening display unit 83), the minute opening further divided into 16 parts. By finely visually recognizing the state of the total opening degree pointer unit 81 with respect to the display unit 84, the valve body body 10 is operated within the range of the opening degree suitable for filling water while accurately adjusting the opening degree of the valve body body 10. Therefore, the initial water flow can be performed while properly filling the water.

In this case, when the input shaft 60 is rotated, the pointer 81a of the full opening guide unit 81 on the output shaft 61 side is configured to rotate with respect to the full opening display unit 51 which is a scale to indicate the opening. As a result, the visibility of the total opening pointer portion 81 in the entire range from the valve closed state (valve angle 0 °) to the valve open state (valve angle 90 °) is high, and the approximate valve body opening can be confirmed at a glance. ..
On the other hand, since the minute opening display unit 84 on the input shaft 60 side is configured to rotate with respect to the zero point display unit 91, which is a fixed point, to match the scale 84a, an arbitrary target value of the scale 84a is displayed at the zero point. It is easy to match with the part 91 and it is easy to adjust to an arbitrary opening.
From these facts, while grasping the total opening degree by the total opening degree pointer unit 81 and the total opening degree display unit 51, the minute opening degree display unit 84 and the zero point display unit 91 finely set the valve body angle to be arbitrary. The valve body opening can be adjusted with high accuracy.

Moreover, when the operator operates the key handle to rotate the minute opening display unit 84, the body is oriented in a constant direction and the line of sight is directed from one direction, and the rotation is in the direction of the fixed point zero point display unit 91. You can check the target value by the scale 84a. Therefore, although the minute opening display unit 84 is configured to rotate a plurality of times with respect to the zero point display unit 91, these states can be easily adjusted while checking from the position of the fixed point state without moving the body or the line of sight. it can.

In particular, in this example, the minute opening scale is set as a rotation scale so that the minute opening display unit 84 rotates synchronously with the input shaft 60. As a result, when adjusting the minute opening, the operation can be performed more intuitively and the adjustment becomes easier than the method of turning the minute opening pointer.
The pointer rotation structure in which the normal full-opening pointer unit 81 rotates, which is used for the full-opening display unit 83, has sufficient visibility in the application of confirming the current opening degree.

The minute opening degree display unit 84 is marked on the display member 80 located inside the name plate 82 on which the full opening degree display unit 83 is written, so that they are close to each other. When the display member 80 is rotated via the cap 63, the total opening degree pointer unit 81 and the minute opening degree are displayed with respect to the 0% opening degree display and the zero point display unit 91 marked at the same position on the full opening degree display unit 83. It is easy to visually recognize each of the display units 84. Moreover, the full opening guideline portion 81 is located below the plate member 87 on which the display member 80 is mounted, and the name plate 82 is located below the full opening degree guideline portion. As a result, the visibility is further improved, and it is easy to visually recognize the pointer 81a of the full opening pointer 81 close to the full opening pointer 83 to grasp the total opening, and the pointer 81a may cover the minute opening display unit 84. Therefore, any scale 84a of the minute opening degree display unit 84 can be accurately adjusted with respect to the zero point display unit 91 located below.

The minute opening display unit 84 has a scale 84a that is equally divided, and the full opening display unit 83 is marked with a zero point display unit 91 that indicates a leak position of the valve, which is a water filling start position. The position of the display member 80 can be adjusted in the circumferential direction at the water flow start position of 1, the scale 84a can be aligned with the zero point display unit 91, and the base point at the time of water filling disclosure can be set accurately. As a result, the input shaft 60 can be accurately rotated to a predetermined valve opening according to the individual difference of the valve, and the valve can be smoothly opened with an accurate opening to a region suitable for filling water for each valve body 1. The body body 10 can be operated, and the water is not turbid or red water is generated when the water is filled.

As described above, since the total opening and the minute opening can be visually recognized by the name plate 82, the display member 80, and the full opening pointer 81, the number of parts can be minimized, and the valve body buried underground can be used. It also becomes easy to attach to 1.

FIG. 18 shows a third example of the display unit. In the following display units, the same parts as those of the above-mentioned display unit examples are represented by the same reference numerals, and the description thereof will be omitted.
In this example, only the full opening degree display unit 83 is marked on the display unit 102 of the name plate 101, while the full opening degree guideline unit 103 is provided with one pointer 103a indicating the full opening degree display unit 83. In this way, the rotation speed display unit 86 of FIG. 14 can be omitted, and in this case, the display of the name plate 101 and the shape of the total opening degree pointer unit 103 can be simplified.

FIG. 19 shows a fourth example of the display unit. In this example, the display unit 112 of the name plate 111 is provided with a full opening display unit 83, and separately from the full opening display unit 83, a rotation speed display plate 113 is provided at an interval of 180 ° from the full opening display unit 83. Be done. In this case, the zero position of the display member 80, the pointer 81a indicating the name plate 111 of the total opening degree pointer 81 and the pointer 81a on the opposite side are the opening position of the valve leakage position, and the rotation number display unit of the rotation number display plate 113. By setting and mounting the zero rotation display unit 115 of 86 at a position where it is in a straight line, the zero point can be confirmed at that position, which facilitates visual recognition, and the fully closed state (valve angle 0 °) and the zero point. The difference between them becomes clear.

1 Valve body 2 Valve box 3 Valve body 10 Valve body 11 Valve seat 12 Valve seat retainer 13 Spacer 16 Valve box side valve seat surface 22 Spherical outer circumference 23 Spherical outer circumference 24 Comb tooth groove 30 Groove 31 Bottom 39 Reducer 40 Operation unit 41 Display unit C Clearance S Gap

Claims (1)

A speed reducer having an input shaft and an output shaft, and the speed reducer is a valve provided with a total opening degree display unit indicating the opening degree of the output shaft and a pointer for checking the opening degree. , It is an adjustment range display unit that adjusts the valve opening range, and a filling opening range display unit that is also written in the adjustment range display unit is provided at a position near the 0% side of the adjustment range display unit. In the adjustment range display unit and the filling opening opening range display unit, the working pressure value display unit for flowing a water amount suitable for filling according to the working pressure value in a state where the filling flow velocity is set in advance. A valve with a water filling function, which is characterized by being configured by adding.

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