JPH08303615A - Valve device - Google Patents

Abstract

PURPOSE: To reduce operation torque for rotating a valve element, keep stable fitting between the valve element and a valve seat, and prevent foreign matter from being ten into a wedged surface between a thrust ring and an adjustment ring. CONSTITUTION: A valve device 1 is adapted to adjustment and interruption for a flow rate of fluid. In such a device, one valve seat holder 13 is fixed to a thrust ring 24. An adjustment ring 31 has a pair of inner guide plates 34 fixed to both inner sides in the vertically moving and perpendicular directions of the adjustment ring 31. The thrust ring 24 has a dovetail groove 27 engaged with the paired inner guide plates 34. A movement regulation means 23 is provided for regulating movement of the adjustment ring 31 in the flowing direction 56 of the fluid. The thrust ring 24 and the adjustment ring 31 are shut off from a channel arranged on an outer side 14 of the valve seat holder 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device used for both adjusting and shutting off a flow rate of a fluid, and more particularly to a valve structure capable of adjusting a contact state between a valve element and a valve seat.

[0002]

2. Description of the Related Art Conventionally, for example, a valve provided in a fluid passage and used for both adjusting or blocking the flow rate is shown in FIG.
Such a valve is known (Japanese Utility Model Publication No. 58-11975). In this valve 2, a valve element 9 provided in a space formed by a valve body 3 and a body cover 8 has a spherical shape, and a communication hole 10 is formed in one direction passing through a central axis of the spherical valve element 9. The handle 4 is provided with the valve element 9 attached to the stem 41.
The direction of the communication hole 10 is changed by rotating 2 to adjust or block the flow rate of the fluid in the flow path 55.

Further, the valve element 9 of the valve 2 is in close contact with the valve seats 11 and 12, and the valve seats 11 and 12 are held by one valve seat holder 13 and the other valve seat holder 22. Then, the valve 2 has a thrust ring 24 having a wedge surface 25.
And an adjusting ring 31 having a wedge surface 32, the wedge surfaces 25 and 32 of which are slidable with respect to each other, and the action of the adjusting screw 44 by the rotation of the adjusting screw rod 43 attached to the adjusting ring 31. Since the adjusting ring 31 is moved in the direction 57 perpendicular to the flow path direction 56 by the, the valve seat 11 is pressed against the valve element 9 via the one valve seat holder 13 so as to be in close contact therewith, thereby preventing fluid leakage.

[0004]

In such a valve 2, adjustment of the close contact state between the valve 9 and the valve seats 11 and 12, that is, increase in the surface pressure between the valve 9 and the valve seats 11 and 12. Is configured to prevent fluid leakage. When the valve 9 is rotated from the fully closed state in which the valve 9 blocks the flow of fluid, the adjustment ring 31 is retracted to lower the surface pressure and the handle 42 is operated to rotate the valve 9, the valve seat 11 is sufficiently removed from the valve 9. The valve 9 is rotated with the surface pressure remaining without being separated.
The operating torque for rotating the valve is large, and particularly when the valve itself is large, the operating torque for rotating the valve element 9 and its device are also large, which is difficult and uneconomical to operate. there were.

Further, although the valve 9 and the valve seats 11 and 12 have been variously devised from the viewpoint of material and structure, iron powder and other foreign matters floating in the fluid in the flow path may cause the valve 9 to fly. And valve seat 1
1 and 12, or the wedge surfaces 25 and 32 of the thrust ring 24 and the adjusting ring 31 are bitten and damaged, and not only leakage of fluid but also increase in operating torque for rotating the valve and when the valve is used. There was a problem such as uneven surface pressure on the contact surface between the valve and the valve seat.

The object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the operating torque for rotating the valve element, and to maintain a uniform surface pressure between the valve element and the valve seat for a long period of time. An object of the present invention is to provide an economical valve device in which foreign matter is not caught in the wedge surfaces of the thrust ring and the adjusting ring.

[0007]

In order to achieve the above object, the present invention provides a ball-shaped valve element, a pair of ring-shaped valve seats for holding the valve element, and a pair of the ring-shaped valve. Two valve seat holders each holding a seat, a thrust ring provided on one of the valve seat holders and having a wedge surface inclined with respect to a direction perpendicular to the fluid flow direction, and a wedge surface of the thrust ring. By having a wedge surface that abuts the wedge surface of the thrust ring at the same angle and moving forward and backward in the direction perpendicular to the flow path direction, the close contact state between the valve element and the valve seat is established through the one valve seat holder. In the valve device having an adjusting ring for adjusting and used for both adjusting and shutting off the flow rate of the fluid, the one valve seat holder is fixed to the thrust ring, and the advancing / retreating movement of the adjusting ring causes the flow passage. Move forward or backward Dynamic and, the valve seat and the valve element by forward or backward movement of one of the valve seat holder said is to contact and separation.

Further, in the above invention, the adjusting ring is provided with a pair of inner locking pieces fixed to both inner sides of the adjusting ring passing through the center point of the adjusting ring and at a right angle to the forward / backward movement direction of the adjusting ring. The thrust ring is provided with locking grooves that are provided on both insides corresponding to the pair of inner locking pieces and pass through the center point of the thrust ring and that lock with each of the pair of inner locking pieces.

Further, in any one of the above inventions, there is provided a movement regulating means for regulating movement of the adjusting ring in the flow path direction of the fluid.

Further, in any one of the above inventions, the thrust ring and the adjusting ring are provided outside the one valve seat holder and are cut off from the flow passage.

Further, in any of the above inventions, the thrust ring and the adjusting ring are provided on both the valve seat holder.

[0012]

According to the present invention, one of the valve seat holders is fixed to the thrust ring, and the thrust ring is moved forward or backward in the flow direction by the forward / backward movement of the adjusting ring in the direction perpendicular to the flow direction. The valve element and the valve seat are brought into contact with or separated from each other by the forward or backward movement of the one valve seat holder fixed to the thrust ring. When the valve device is fully closed, the valve element and the valve seat are evenly and closely contacted with each other at an appropriate surface pressure to prevent fluid leakage. On the other hand, when rotating the valve element from the time when the valve device is fully closed,
The valve element is separated from the valve seat, and the valve element is rotated by a small operating torque. Moreover, since the valve element and the valve seat are rotated in a state of being separated from each other, the contact surface between the valve element and the valve seat is not damaged, and the contact surface between the valve element and the valve seat is uniform and has an appropriate surface pressure. And maintain stable adhesion over a long period of time.

Further, in the above invention, the adjusting ring is
The thrust ring is provided with a pair of inner locking pieces that pass through the center point of the adjustment ring and are fixed on both insides in the direction perpendicular to the forward / backward movement direction of the adjustment ring. In addition to the function of the above-described invention, the adjustment ring of the adjustment ring is provided by a locking groove that is provided on both inner sides corresponding to the inner locking pieces and that locks with each of the pair of inner locking pieces. The forward / backward movement in the direction perpendicular to the flow passage direction is the forward or backward movement of the thrust ring in the flow passage direction, so that the valve element and the valve seat are brought into contact with or separated from each other.

Further, in any one of the above inventions, a movement restricting means for restricting the movement of the adjusting ring in the flow channel direction is provided. In addition to the operation of any one of the above inventions, the adjusting ring is perpendicular to the flow channel direction. When the adjusting ring is moved in the direction of, the movement of the fluid in the flow path direction is restricted by the movement restricting means, and the valve seat of the valve seat holder fixed integrally with the thrust ring is reliably separated from the valve element.

Further, in any one of the above inventions, the thrust ring and the adjusting ring are provided outside one of the valve seat holders and cut off from the flow passage. There is no risk that iron powder or other foreign matter floating in the fluid in the flow path will not bite into the wedge surfaces of the thrust ring and the adjusting ring and cause damage, and the valve element and valve seat can be reliably brought into contact with and separated from each other.

In any one of the above inventions, the thrust ring and the adjusting ring are provided on both of the valve seat holders.
The respective valve elements and valve seats are brought into contact with and separated from each other, so that the operation of the valve device becomes more reliable.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the valve device according to the present invention. The valve device 1 of the present embodiment holds a ball-shaped valve element 9, a pair of ring-shaped valve seats 11 and 12 that holds the valve element 9, and a pair of ring-shaped valve seats 11 and 12, respectively. Thrust ring having two valve seat holders 13 and 22 and a wedge surface 25 that is provided in one of the valve seat holders 13 and is inclined with respect to a direction 57 perpendicular to the fluid flow direction 56. 24 and.

Further, in the valve device 1 of this embodiment, the thrust ring 24 is formed at the same angle as the wedge surface 25 of the thrust ring 24.
The adjusting ring for adjusting the close contact state between the valve element 9 and the valve seat 11 via the valve seat holder 13 on one side by having the wedge surface 32 abutting against the wedge surface 25 and moving forward and backward in the direction 57 perpendicular to the flow path direction. And 31 for use in both adjusting and blocking the flow rate of the fluid.

One of the valve seat holders 13 has a cylindrical portion 16 and an overhanging portion 17, and a thrust ring 24 is in contact with the back surface 18, so that the one valve seat holder 13 and the thrust ring 24 are fixed to each other. They are fixed to each other by bolts 15. The thrust ring 24 and the adjusting ring 31 are disposed on the outer side 14 of the one valve seat holder 13, and the sealing material 19 is provided between the one valve seat holder 13 and the valve body 4 to separate the thrust ring 24 and the valve body 4. Seal material 2
9 and between the other valve seat holder 22 and the valve body 3 is sealed with a sealing material 20 for fluid in the flow path.

The thrust ring 24 and the adjusting ring 31 are
The wedge surfaces 25 and 32 inclined with respect to the direction perpendicular to the flow path direction 56 slidably abut. The adjusting ring 31 is screwed onto the adjusting screw 44 of the adjusting screw rod 43 at its upper portion, and the adjusting screw rod 43 is connected to the joint 45.
It is connected to the. The adjusting screw rod 43 is the bush 4
A bolt 48a is attached to the valve body 4 and the valve body 4 through 6, 47.
It is supported by a stand 48 fixed by. As shown by the broken line in FIG. 1, the inner guide plate 34, which is an inner locking piece, is fixed to the adjusting ring 31, and the thrust ring 24 is provided with a locking groove as shown by the broken line in FIG. A dovetail groove 27 is provided.

2 to 4 show the structure of the inner guide plate 34 and the dovetail groove 27, and FIG. 2 shows the adjustment ring 31 and the thrust ring 24 of the valve device shown in FIG.
FIG. 3 is a cross-sectional view taken out of FIG. 3, FIG. 3 is a cross-sectional view taken along the arrow I in FIG. 2, and FIG.

2 and 3, the adjusting ring 31 has a pair of inner guide plates 34 fixed to both inner sides in a direction 58 perpendicular to the direction in which the adjusting ring 31 moves forward and backward through the center point 33 of the adjusting ring 31. The thrust ring 24 is provided on both inner sides corresponding to the pair of inner guide plates 34 passing through the center point 26 of the thrust ring 24 and is engaged with each of the pair of inner guide plates 34.
7 is provided. Thrust ring 24 and adjustment ring 31
Is the outer side 1 of the one valve seat holder 13 as described above.
4 and is cut off from the flow path 55. In FIG. 3, the broken line portion 31b indicates the contact surface of the adjusting ring 31 with the thrust ring 24, and the parallel pin 37 is omitted.

Next, referring to FIG. 4, the inner guide plate 3
4 is fixed to the adjustment ring 31 by the hexagon socket head cap screw 36, the parallel pin 37 and the spring pin 38, and the locking portion 35 of the inner guide plate 34 is
4 is retained in the dovetail groove 27. As shown in FIG.
Two hexagon socket head cap screws 36, two parallel pins 37 and two spring pins 38 are used.

FIG. 5 is a front view of the movement restricting means 23 shown in FIG. The movement restricting means 23 of the present embodiment is formed of a guide pin 30 fixed to the valve body 4 and a guide hole 31 a provided at the lowermost part of the adjusting ring 31, and the guide pin 30 guides the adjusting ring 31. It is slidably fitted in the hole 31a.

Further, in the valve device 1 of the present embodiment, the outer shell of the valve body 3 and the valve body 4 is formed, and the valve body 3,
A valve 9 is provided in the space formed by 4. The valve body 3 and the valve body 4 are fitted and fixed to each other with a plurality of studs 5 and nuts 6 concentrically planted in the valve body 3 via a seal member 7. The valve element 9 has a spherical shape, and a communication hole 10 penetrating the center of the valve element 9 is formed. A stem 41 is provided at an upper portion of the valve element 9 and a valve element stay 49 is provided at a lower portion thereof. Benji stay 4
It is rotatably supported by the valve body 3 together with 9. The valve stay 49 is supported by a lid 50 fixed to the valve body 3 with a bolt 54 via a spring 53. Reference numeral 52 is an O-ring.

Further, the pair of ring-shaped valve seats 11 and 12 held by the valve seat holders 13 and 22 hold the valve element 9, and the pair of ring-shaped valve seats 11 and 12 are elastic. A high-quality material such as synthetic rubber or Teflon is used. When the stem 41 rotates, the valve 9
The communication hole 10 is opened to the left and right channels 55, 55 to be fully opened, or the communication hole 10 is fully closed in a direction perpendicular to the channels 55, 55.

The valve device 1 of this embodiment having the above structure
Works as follows. That is, in FIG. 1, when the flow path is blocked, the adjusting screw 44 is rotated by rotating the adjusting screw rod 43 via the joint 45 by an operating device (not shown), and the adjusting screw 44 is screwed into the adjusting screw 44. The ring 31 moves downward in FIG. 1 in a direction 57 perpendicular to the flow path direction. The action of the wedge surface 32 of the adjusting ring and the wedge surface 25 of the thrust ring causes the adjusting ring 31 to move the thrust ring 24 to the right in FIG. Therefore, the thrust ring 24 is attached to the rear surface 18 of the protrusion 17 of the valve seat holder 13.
Is pressed rightward in FIG. 1, and the valve seat 11 is brought into close contact with the valve element 9.
At the same time, the valve seat 12 on the right side of FIG. 1 also comes into close contact with the valve element 9 by the reaction.

Since the valve seats 11 and 12 are made of a highly elastic material and held by the valve seat holders 13 and 22, respectively, the close contact with the valve element 9 is further enhanced. Disciple 9
When the adhesion force or sealing property between the valve element 9 and the valve seats 11 and 12 is weakened by repeated use of the rotation of the adjusting screw 44, the adjusting screw rod 43 is further rotated through the joint 45 to rotate the adjusting screw 44. Then, by moving the adjusting ring 31 downward and moving the thrust ring 24 to the right, it is possible to increase the degree of contact between the valve element 9 and the valve seats 11 and 12, and at the same time, use the joint 45 to adjust the adjusting screw rod. By fixing the rotation of 43, the valve 9 and the valve seat 11, 1
The surface pressure of 2 can be maintained evenly and appropriately for a long period of time.

When the valve element 9 is rotated via the stem 41 when the flow passage 55 is blocked, first, the adjusting screw rod 43 is rotated.
When the adjusting screw 44 is rotated by moving the adjusting ring 31 to move the adjusting ring 31 upward, the inner guide plate 34 fixed to the adjusting ring 31 also rises, but as shown in FIG. The inner side surface 35a of the locking portion 35 of 34 abuts on the inner side surface 28a of the locking portion 28 of the thrust ring 24 and rises along the dovetail groove 27 shown in FIGS. By retreating, that is, moving to the left in the figure, the valve element 9 and the valve seat 11 are separated.

At this time, since the adjusting ring 31 is slidably fitted to the guide pin 30 fixed to the valve body 4, even if the adjusting ring 31 is moved upward, the adjusting ring 31 does not move in the fluid. Movement of the thrust ring 24 in the flow path direction 56 is restricted, and the thrust ring 24 is forcibly retracted.

Therefore, when the valve device is fully closed, the valve element 9 and the valve seat 11 are evenly and closely contacted with each other with a proper surface pressure to prevent fluid leakage. On the other hand, when the valve element 9 is rotated after the valve device is fully closed, the valve element 9 and the valve seat 11 are separated from each other, and the valve element 9 is rotated by a small operation torque. Moreover, the valve 9 and the valve seat 11
Since the valve element 9 is rotated in the state where the valve element is separated from the valve element, the contact surfaces of the valve element 9 and the valve seat 11 are not damaged, the contact surfaces have an even and appropriate surface pressure, and are stable for a long period of time. Maintains close contact. Furthermore, due to a very simple mechanism, the forward / backward movement of the adjusting ring 31 is the forward or backward movement of the thrust ring 24.
The valve 9 and the valve seat 11 are separated from each other. The valve 9 and the valve seat 12
With the contact and separation of the valve 9 and the valve seat 11, substantially acts on the surface pressure of the valve 9 and the valve seat 11.

Further, since the thrust ring 24 and the adjusting ring 31 are located on the outer side 14 of the valve seat holder 13, the thrust ring 24 and the adjusting ring 31 are insulated from the fluid in the flow passage and are mixed with the fluid in the flow passage 55 to float. Foreign substances such as powder are sealed by the sealing materials 19, 20,
There is no risk of being blocked by the valve seats 11 and 12 and the sealing material 29, entering the side where the thrust ring 24 and the adjusting ring 31 are provided, and being caught.

According to the valve device 1 of the present embodiment, the one valve seat holder 13 is a relatively long cylinder and the seals 119 and 1 are provided.
Since the distance between 9 is long, the axis center is maintained with high accuracy. Therefore, the eccentric load of the valve seat 11 on the valve 9 is eliminated, and the valve 9
The surface pressure of the ball contact surfaces of the valve seats 11 and 12 can be kept uniform, which is effective in maintaining the long-term life of the valve seats 11 and 12.

Further, conventionally, in such a type of valve device, it is necessary to add a dimension adjusting member for the valve element and the valve seat for fine adjustment of the surface pressure at the time of assembling, or to repeatedly disassemble and assemble. However, in the valve device 1 of this embodiment, the surface pressure can be adjusted after the assembly by the wedge ring of the thrust ring 24 and the adjusting ring 31, and therefore, the workability of the manufacturing surface, the quality control,
Great benefits can be obtained not only in process control but also in cost reduction.

Further, the valve device 1 of this embodiment is used in the field when the valve device 1 is leaked due to damage due to foreign matter in the flow passage or deterioration over time due to long-term use.
Leakage can be prevented by further tightening the adjusting screw rod 43 provided at the.

Further, in the valve device 1 according to the above embodiment,
By lengthening the joint 45, the valve body can be directly buried in an arbitrary depth position in the soil so that the joint 45 can be operated from the ground.

Further, in the above embodiment, the thrust ring 24 and the adjusting ring 31 are provided on one valve seat holder 1
3 is provided, but the other valve seat holder 22
By providing a thrust ring and an adjusting ring having the same structure as above on the side of, also when the valve element 9 is rotated, the contact surfaces of the valve element and the valve seat are separated from each other at both right and left positions to ensure the reliability. The torque for rotating the valve 9 is reduced.

FIGS. 6 and 7 show another embodiment of the movement restricting means 23, and FIG. 6 is a view seen from the same direction as FIG.
FIG. 5 is a sectional view seen from the same direction as FIG. 4. The movement restricting means 23 of the present embodiment includes an outer guide plate 39 which is an outer locking piece fixed to the adjustment ring 31 and the inner guide plate 34 via a hexagon socket head bolt 36 and a parallel pin 37,
The outer groove 4a formed in the valve body 4 and the other contact surface 31c of the adjusting ring 31 and the outer guide plate 39.
It is held in the outer groove 4a by the contact surface 39a and restricts the movement of the adjusting ring 31 in the flow path direction 56 with respect to the pulling up movement of the adjusting ring 31.

In FIGS. 6 and 7, the same structure and function as those in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. Further, in FIG. 6, the parallel pin 37 is omitted.

[0040]

According to the present invention, one of the valve seat holders is fixed to the thrust ring, and the thrust ring is retracted in the flow path direction by the upward movement of the adjusting ring.
The valve and the valve seat are reliably separated, and the valve can be rotated with a small operating torque. Moreover, the contact surface between the valve and the valve seat is not damaged by the rotation of the valve, and it can be used for a long period of time. Maintain stable and close contact, and the valve element and valve seat are evenly and closely contacted with each other in an appropriate surface pressure state to prevent fluid leakage.

Further, in the above invention, the adjusting ring is
The thrust ring is provided with a pair of inner locking pieces, and the thrust ring has a locking groove for locking each of the pair of inner locking pieces.
In addition to the effects of the invention described above, with a very simple mechanism, the forward / backward movement of the adjustment ring in the direction perpendicular to the flow path direction is the forward or backward movement of one valve seat holder fixed to the thrust ring, and The child and valve seat are surely brought into contact with each other.

Further, in any one of the above inventions, a movement regulating means for regulating the movement of the fluid of the adjusting ring in the flow path direction is provided, and in addition to the effect of any one of the above inventions, it is fixed integrally with the thrust ring. The valve seat of one of the valve seat holders that has been removed is more reliably separated from the valve element.

Further, in any one of the above inventions, the thrust ring and the adjusting ring are provided outside one of the valve seat holders and are cut off from the flow passage. Iron powder or other foreign matter floating in the fluid in the passage is less likely to be damaged without being caught in the wedge surfaces of the thrust ring and the adjusting ring, and the valve element and the valve seat are reliably brought into contact with and separated from each other.

In any one of the above inventions, the thrust ring and the adjusting ring are provided on both the valve seat holder, and in addition to the effect of any one of the above inventions,
The respective valve elements and valve seats are brought into contact with and separated from each other, so that the operation of the valve device becomes more reliable.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a valve device according to the present invention.

2 is a cross-sectional view showing an adjusting ring and a thrust ring taken out of the valve device shown in FIG. 1. FIG.

FIG. 3 is a view on arrow I in FIG.

4 is a sectional view taken along line II-II in FIG.

5 is a front view of the movement restricting means shown in FIG. 1. FIG.

FIG. 6 shows another embodiment of the movement restricting means, and is a view seen from the same direction as FIG.

7 is a cross-sectional view showing the movement restricting means shown in FIG. 6, viewed from the same direction as FIG.

FIG. 8 is a cross-sectional view of a valve according to the related art.

[Explanation of symbols]

 1 valve device 9 valve 11, 11 valve seat 13 one valve seat holder 14 outer side 22 other valve seat holder 23 migration restricting means 24 thrust ring 25 wedge surface 26 center point 27 groove (locking groove) 31 adjusting ring 32 Wedge surface 33 Center point 34 Inner guide plate (inner locking piece) 55 Flow path 56 Flow direction 57 Direction perpendicular to flow direction 58 Direction perpendicular to forward / backward movement direction

Claims (5)

[Claims] 1. A ball-shaped valve element, a pair of ring-shaped valve seats for holding the valve element, two valve seat holders respectively holding the pair of ring-shaped valve seats, and the valve seat holder. A thrust ring which is provided on one side and has a wedge surface inclined with respect to the direction perpendicular to the fluid flow direction, and a wedge surface which abuts the wedge surface of the thrust ring at the same angle as the wedge surface of the thrust ring. An adjustment ring that adjusts the close contact state of the valve element and the valve seat via the one valve seat holder by moving forward and backward in the direction perpendicular to the flow path direction, and adjusting the flow rate of the fluid or In the valve device used for both shutoff, the one valve seat holder is fixed to the thrust ring and is moved forward or backward in the flow path direction by the advancing / retreating movement of the adjusting ring to advance the one valve seat holder. Or by moving backward The valve device is characterized in that the valve element and the valve seat are brought into contact with and separated from each other. 2. The adjusting ring according to claim 1,
The thrust ring is provided with a pair of inner locking pieces that are fixed to both inner sides of the adjustment ring in a direction perpendicular to the forward / backward movement direction of the adjustment ring, the thrust ring passing through the center point of the thrust ring. 2. A valve device, comprising: locking grooves provided on both inner sides corresponding to the inner locking pieces, and locking grooves for locking each of the pair of inner locking pieces. 3. The valve device according to claim 1, further comprising a movement restricting unit that restricts movement of the adjustment ring in the flow path direction of the fluid. 4. The thrust ring and the adjusting ring according to claim 1, wherein the thrust ring and the adjusting ring are provided outside the one valve seat holder and are cut off from the flow passage. Valve device to do. 5. The valve device according to claim 1, wherein the thrust ring and the adjustment ring are provided on both of the valve seat holders.