JP2006348967A - Valve gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve gear capable of preventing the surface and the valve seat face (seat surface) of a valve element from being damaged by foreign matter such as powder contained in a fluid. <P>SOLUTION: This valve gear comprises a valve box 14 in which a fluid passage 14c is formed, the valve element 11 installed to block the fluid passage 14c and opening and closing the fluid passage 14c, and valve seats 20, 21 formed on the valve box 14 and sealing clearances between the valve element 11 and the fluid passage 14c. The valve element 11 is formed by combining the valve element 11 divided into three parts through a sloped surface 11c so that the sloped surface 11c comes into contact therewith. On the sloped surface 11c, the divided valve element 11e positioned at the center and the valve elements positioned on both sides thereof are slidably moved relative to each other so that the width of the fluid can be changed in the flow direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a valve device for opening and closing a fluid passage, and particularly to a valve device suitable for being provided in a passage for high-pressure fluid containing powder.

  The valve device mainly has a valve box constituting the outer shape of the device, and a valve body that is provided in the valve box and partitions the fluid passage, and the upstream valve seat and the downstream valve seat provided in the valve box are respectively The flow of fluid is blocked by closely contacting the valve body. In a state where the flow of the fluid is blocked, the upstream side from the valve body, the space in the valve box, and the downstream side from the valve body are partitioned. Further, the fluid passage is opened by moving the valve body to the open storage space in the valve box by operating the handle or the like.

  Therefore, as the performance of the valve device, the sealing performance between the valve body and the valve seat when the fluid passage is shut off is important, and various sealing structures and methods have been conventionally proposed (for example, Patent Documents 1 and 2). reference.).

JP 2001-235040 A Japanese Patent Laid-Open No. 5-141548

In particular, depending on the location where the valve device is applied, the fluid may contain foreign substances such as powder, or it may be a fluid containing a radioactive substance, and the leak tolerance is set to be extremely low. In some cases, high sealing performance may be required. In other words, in a fluid containing foreign matter, sealing performance deteriorates when foreign matter enters the sealing surface, so frequent maintenance is required, or leakage occurs due to the presence of a small amount of foreign matter on the sealing surface. There is a problem that the set allowable leak amount cannot be stably maintained. In addition, the cost for frequently solving such problems also increases. Furthermore, when the fluid to be handled is radioactive contaminants, the influence of the leak on the environment is naturally large.
As a valve device considering such a point, there is one (Japanese Patent Application No. 2004-232922) filed earlier by the present applicant.

In this Japanese Patent Application No. 2004-232922, there are two split valve bodies (that is, a wedge-shaped split valve body whose width along the fluid passage direction decreases as it goes downward, and conversely, There is disclosed a valve device including a valve body having a divided valve body having a wedge shape in cross section, whose width along the fluid passage direction decreases as it goes.
However, in such a valve device, the valve closing end (when trying to close the valve body, that is, when the wedge force acts on the divided valve body) or the valve opening initial stage (when the valve body is closed) In this case, the divided valve body slides while being pressed against the valve seat with a high surface pressure. For this reason, the surface of the valve body and the valve seat surface (seat surface) may be damaged by foreign matters such as powder contained in the fluid, and if the damage is deep, the fluid will leak from there. There is also a risk of leaking.

  The present invention has been made in view of the above circumstances, and prevents the surface of the valve body and the valve seat surface (seat surface) from being damaged by foreign matter such as powder contained in the fluid. It aims at providing the valve apparatus which can do.

The present invention employs the following means in order to solve the above problems.
The valve device according to the present invention includes a valve box provided with a fluid passage, a valve body that is provided to block the fluid passage, and opens and closes the fluid passage, and is provided in the valve box, the valve body and the fluid passage. A valve seat that seals a gap between the valve body and the valve body, which is divided into three parts through an inclined surface so that the inclined surface is in contact with each other. The width of the fluid flow direction is changed by relatively sliding the valve body to be moved and the valve bodies located on both sides thereof.
According to such a valve device, since the valve body is constituted by three wedge-shaped valve bodies (hereinafter referred to as “divided valve body”), when the valve is closed (when trying to close the valve body) That is, when the wedge force acts on the split valve body) or at the initial stage of valve opening (when trying to open the valve body from the closed state), the split valve body at a position facing the valve seat is high in the valve seat. It is possible to prevent sliding in a state of being pressed by the surface pressure, and the surface of the divided valve body and the surface of the valve seat (seat surface) are, for example, powder contained in the fluid. It can prevent being damaged by a foreign object.

The valve device according to the present invention is characterized in that an elastic buffering means is provided on the inclined surface.
According to such a valve device, when the valve body is closed, the surface of the divided valve body can be brought into close contact with the seat surface of the valve seat with a stronger force by the elastic force (spring action) of the elastic buffer member. .
Further, it is possible to absorb an impact force when the inclined surface and the inclined surface come into contact with each other, and to prevent the displacement of the split valve body due to the impact and the generation of an impact sound.

The valve device according to the present invention is characterized in that an elastic material is provided on the surface of the valve body facing the valve seat.
According to such a valve device, the elastic member provided on the surface of the divided valve body and the valve seat come into contact with each other. Therefore, in a state where the valve body is closed, the degree of adhesion between the divided valve body 11 and the valve seat 21 can be further improved, and the sealing performance can be further improved.

  According to the valve device of the present invention, there is an effect that the surface of the valve body and the valve seat surface (seat surface) can be prevented from being damaged by foreign matters such as powder contained in the fluid. .

Hereinafter, a first embodiment of a valve device according to the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a schematic cross-sectional structure diagram of the valve device 10 according to the present embodiment, and FIG. 2 is an enlarged view of a portion of the valve body 11 in FIG.

As shown in FIG. 1, a valve device 10 according to the present embodiment includes a valve body 11 that opens and closes a fluid passage, a valve body holding ring 12 that houses the valve body 11, and one end (the lower end in FIG. 1). Sealed by the flange 13 and connected to the valve body 14 having the closed valve body housing part 14a, the opened valve body housing part 14b and the valve box port 14c, and the valve body holding ring 12, and the reciprocating movement of the valve body 11 ( The main components are a valve stem 15 that can move in the vertical direction in FIG. 1 and a handle 16 that is connected to the valve stem 15 and moves the valve stem 15 up and down.

The fluid passage communicates with a valve box port 14c provided through the valve box 14, and the fluid flows in the valve box port 14c. The valve body holding ring 12 connected to the valve stem 15 reciprocates (moves up and down in FIG. 1) together with the valve stem 15 by rotating the handle 16 and the sleeve 17. Along with this, the valve body 11 accommodated in the valve body holding ring 12 also reciprocates together (moves up and down in FIG. 1).
Further, in order to seal the inside of the valve box 14, a gland packing 18 and a dust packing 19 are provided at the neck portion of the valve box 14 to seal the gap between the valve rod 15 and the valve rod 15.

  When the valve body 11 moves to one side (downward in FIG. 1), the opening 11a provided at one end of the valve body 11 is closed when the valve body storage part is provided at one (downward) inside the valve box 14. The closed portion 11b, which is the other end portion of the valve body 11, blocks the valve box port 14c at the center and prevents the flow of fluid in the fluid passage. As a result, the valve device 10 is in a closed state as shown in FIG.

  When the valve body 11 moves to the other side (upward in FIG. 1), the closing portion 11b which is the other end portion of the valve body 11 is moved to the open valve body storage portion 14b provided on the other (upper side) in the valve box 14. While being housed, an opening 11a provided at one end of the valve body 11 communicates with the valve box port 14c, and the valve box port 14c functions as a fluid passage in the valve box 14. As a result, the valve device 10 is opened.

  In order to shut off the valve box port 14c through which the fluid flows and the closed-time valve body storage part 14a and the open-time valve body storage part 14b (particularly, the open-time valve body storage part 14b), the valve body 11 in the valve box 14 And the valve box port 14c are provided with a valve seat 20 on the downstream side in the fluid flow direction and a valve seat 21 on the upstream side.

  When the valve seats 20 and 21 are in close contact with the valve body 11, the valve box port 14c and the valve body storage portions 14a and 14b are shut off. Here, in particular, the open valve body storage portion 14b and the valve box port 14c are blocked by the open valve body storage portion 14b being a space communicating with the outside of the valve device 10, and the open valve body storage portion 14b. This is because the fluid may leak further to the outside through the.

  On the other hand, since the closed valve body storage portion 14a is a space whose one end is sealed by the flange 13, it is relatively more outward than the open valve body storage portion 14b having a sliding structure such as packing. It is a space where there is no need to worry about leakage.

  The valve body 11 has an opening portion 11a at one end and a closing portion 11b at the other end, and a divided valve body 11d, a divided valve body 11e, and a divided valve body 11f that are divided into three on a divided inclined surface 11c. have. The divided inclined surface 11 c is a plane that is inclined at a predetermined angle with respect to the longitudinal axis of the valve stem 15.

  As shown in FIGS. 1 and 2, each of the divided valve bodies 11d, 11e, and 11f is a plate-like member having a wedge shape in cross section. The divided valve body 11e located at the center of these divided valve bodies 11d, 11e, and 11f gradually decreases in width along the fluid passage direction (left and right width in FIG. 1) as it goes to one side (downward). It exhibits a V shape. Further, the divided valve bodies 11d and 11f located on both sides of the divided valve body 11e exhibit a substantially right triangle shape (trapezoidal shape having a right angle) in sectional view, with the width gradually decreasing toward the other (upward). .

  The valve body 11 has a structure in which the inclined surface of the divided valve body 11d and the inclined surface of the divided valve body 11e are brought into contact with each other, and the inclined surface of the divided valve body 11e and the inclined surface of the divided valve body 11f are brought into contact with each other. Thereby, for example, when the divided valve bodies 11d and 11f are fixed and the divided valve body 11e is reciprocated, the width of the valve body 11 along the fluid passage direction changes. That is, when the divided valve body 11e is moved to the other (upward) with respect to the divided valve bodies 11d and 11f, the width along the fluid passage direction of the valve body 23 becomes smaller, and the divided valve body 11e is moved to the lower side. When moved, the width of the valve body 11 increases.

  When the valve body 11 is housed in the valve body holding ring 12, the vertical direction of the outer periphery of the split valve body 11e is in contact with the inner periphery of the valve body holding ring 12, and the vertical direction of the outer periphery of the split valve bodies 11d and 11f is The valve body retaining ring 12 is held so as not to contact the inner periphery.

  As shown in FIG. 2, holes that communicate with the ring are provided on the side of the divided valve bodies 11 d and 11 f in the valve body holding ring 12. A spring receiver 22 is fixed to the outside of the ring of these holes, and a spring 23 as an elastic member is arranged inside the ring of these holes. As a result, the divided valve bodies 11d and 11f that are housed in the valve body holding ring 11 and are movable are always biased to the other side (upward) in the ring. Examples of the elastic member include a spring.

  As described above, in the valve device 10 according to the present invention, the valve body 11 is constituted by the divided valve bodies 11d, 11e, and 11f having three wedge shapes, so that the valve closing end (when the valve body is about to be closed) That is, when the wedge force acts on the split valve body) or at the initial stage of valve opening (when trying to open the valve body from the closed state), the split valve bodies 11d and 11f are high on the valve seats 20 and 21. It is possible to prevent sliding while being pressed by pressure, and the surface of the divided valve bodies 11d and 11f and the surface (seat surface) of the valve seats 20 and 21 are contained in the fluid. It can prevent being damaged by foreign matters such as.

Further, the valve body 11 is made up of three wedge-shaped split valve bodies 11d, 11e, and 11f, and the split valve body 11e is fixed in the valve body holding ring 12, and the split valve bodies 11d and 11f are always attached to the other ( By energizing upward, the width of the valve body 11 along the fluid passage direction (the width in the left-right direction in the figure) can be increased, and the valve body 11 can be securely adhered to the valve seats 20, 21. .
As a result, when the valve device 10 is in the open state and the closed state, the valve body 11 and the valve seats 20 and 21 are always sealed without being separated, and the open valve body storage portion 14b and the closed state of the fluid flowing through the valve box port 14c are closed. Leakage to the valve body storage part 14a can be prevented.

  Further, a rod-shaped stopper 24 (fixing member) extending in the axial direction of the valve rod 15 is fixed to the flange 13. When the valve body retaining ring 12 moves to one side (downward), the stopper 24 is inserted into the spring receiver 22 and the spring 23. Then, when one end surface of the spring receiver 22 hits the flange 13 and the valve body holding ring 12 has completely moved to one side (downward), the stopper 24 protrudes a predetermined amount into the ring of the valve body holding ring 12. It has become.

  In particular, when the valve device 10 is closed, the valve body 11 and the valve seats 20, 21 need to be brought into close contact with each other to improve the sealing performance and prevent fluid leakage. In the present embodiment, the displacement of the divided valve bodies 11d and 11f is limited by the stopper 24 in the valve body holding ring 12, and the valve body 11e is pushed down, so that the divided inclined surface (valve taper surface) 11c Due to the wedge effect, the valve element 11 can be brought into close contact with the valve seats 20 and 21 with a stronger force.

  Valve seat side foreign matter scraping protrusions 25 each having two grooves as foreign matter removing means are provided in contact portions of the valve seats 20 and 21 with the divided valve bodies 11d and 11f, respectively. The shape of the valve seat-side foreign material scraping protrusion 25 is the same as the cross-sectional shape of the valve seats 20 and 21 formed so as to surround the outer periphery of the valve box port 14c. For example, when the valve seats 20, 21 are ring-shaped, a ring-shaped groove is formed.

  When the valve device 10 is applied to a fluid passage of a fluid containing foreign matter such as powder, foreign matter adheres to the inner surface of the valve box port 14c, the inner surface of the opening portion 11a, the wall surface of the closing portion 11b, etc. When the valve body 11 is moved while being in close contact with 20, 21, the attached foreign matter may enter the contact surface between the valve seats 20, 21 and the valve body 11.

  Therefore, the sealing performance of the contact surface is maintained by providing the foreign material scraping protrusion 25 on the contact surface, that is, scraping off the foreign matter that has entered the contact surface by the three convex portions forming the foreign material scraping projection 25. be able to.

  The foreign matter scraping protrusion 25 may be provided on the valve seats 20 and 21 as described above, or may be provided on the divided valve bodies 11d and 11f. However, when the valve device 10 is installed in a fluid passage whose fluid flow direction is, for example, from vertically above to vertically below, the foreign material scraping protrusion 25 is provided on the valve seat 21 side on the upstream side in the fluid flow direction, On the downstream side, it is preferable to provide a foreign matter scraping protrusion 25 on the divided valve body 11f side.

  This is because the foreign material scraping projection 25 is provided on the divided valve body 11d side on the upstream side in the fluid flow direction, or the foreign material scraping projection 25 is provided on the valve seat 20 side on the downstream side. This is because foreign matter tends to accumulate in the case, and if foreign matter accumulates too much in the groove, the sealing performance may be deteriorated. Accordingly, it is preferable that the groove is recessed vertically downward.

  Further, the foreign matter removing means 25 such as a groove in the contact surface between the divided valve bodies 11d and 11f and the valve seats 20 and 21 is provided when the valve device 10 is installed in a fluid passage in which the fluid flow direction is substantially horizontal, for example. Is preferably provided on the valve seats 20 and 21 side as described with reference to FIG. This is because the divided valve body 11e is fixed in the valve body holding ring 12, whereas the divided valve bodies 11d and 11f are movable left and right in the valve body holding ring 12, Since the contact portions of the divided valve bodies 11d and 11f with the valve seats 20 and 21 may slightly change, if the foreign matter removing means 25 such as a groove is provided on the divided valve bodies 11d and 11f side, This is because the alignment with the valve seats 20 and 21 may not be successful.

The valve box 14 is provided with a fluid introduction hole (not shown) which is a hole communicating with the closed valve body storage portion 14b, and from the fluid supply source (not shown) via the fluid introduction hole, for example, Even when the air or nitrogen gas flows out to the valve box port 14c, the fluid flowing in the port 14c and the fluid that does not adversely affect the reaction device installed downstream of the valve device 10 are It is more preferable that the supply is made to the body storage portion 14b and the closed valve body storage portion 14a.
As a result, the pressure in the opening valve body storage portion 14b can be made equal to or higher than the pressure in the valve box port 14c, and the fluid flowing in the port 14c can be transferred to the outside of the valve device 10 through the opening valve body storage portion 14b. The risk of leakage can be further reduced.

In the present embodiment, as a structure in which the width of the valve body 11 can be changed, the valve body 11 is urged and brought into close contact with the valve seats 20 and 21, or a foreign matter scraping protrusion 25 is provided on the contact surface. Foreign substances can be prevented from entering the sealing surface. As a result, both the upstream side and the downstream side can be sealed, and a valve device having high sealing performance can be obtained.
In addition, the frequency of maintenance of the apparatus can be reduced. In particular, when the fluid to be handled is a radioactive contaminant or the like, an effective valve device is obtained.

2nd Embodiment of the valve apparatus by this invention is described using Fig.3 (a) and FIG.
The valve device in the present embodiment is an elastic buffer between the inclined surface of the divided valve body 11d and the inclined surface of the divided valve body 11e and between the inclined surface of the divided valve body 11e and the inclined surface of the divided valve body 11f. It differs from the thing of 1st Embodiment mentioned above by the point provided with the valve body 31 in which the means 32 was provided. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
3A is a cross-sectional view of the valve body 31 in the open state, and FIG. 3B is a side view of FIG. 3A.

For example, as shown in FIG. 3, two elastic buffering means 32 are provided on each of the inclined surface located at the other end of the divided valve body 11d and the inclined surface located at the other end of the divided valve body 11f. In addition, two are provided on each inclined surface located at one end of the divided valve body 11e.
As shown in FIG. 4 (a), each elastic buffer means 32 includes a recess 33 formed in the inclined surface of the divided valve body 11d, the inclined surface of the divided valve body 11e, or the inclined surface of the divided valve body 11f, It has an elastic buffer member 34 provided in the recess 33.
The recess 33 is a recess having a circular shape in plan view (see FIG. 3B) and a rectangular shape in sectional view (see FIG. 4A).
The elastic buffer member 34 has a circular shape in plan view and a rectangular shape in sectional view, like the recess 33, and protrudes from each inclined surface so that its height is greater than the depth of the recess 33. It consists of a soft material (for example, resin etc.) formed so that it may do.

According to the valve device according to the present embodiment, when the valve seats 20 and 21 are machined, even if sufficient parallelism is not obtained, the divided valve body 11d is moved to the valve seat 21 by the elastic buffer member 34, and the divided valve. The body 11f can be along the valve seat 20 and can be brought into close contact therewith.
Further, the inclined surface of the divided valve body 11e can absorb the impact force when contacting the inclined surface of the divided valve body 11d and the inclined surface of the divided valve body 11f, and the divided valve bodies 11d and 11f due to the impact can be absorbed. Misalignment and impact noise can be prevented.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

A third embodiment of the valve device according to the present invention will be described with reference to FIG.
The valve device in the present embodiment is different from that in the second embodiment described above in that an elastic buffer means 42 is provided instead of the elastic buffer means 32 described in the second embodiment. Since other components are the same as those of the second embodiment described above, description of these components is omitted here.

Similarly to the second embodiment, two elastic buffering means 42 are provided on each of the inclined surface located at the other end of the divided valve body 11d and the inclined surface located at the other end of the divided valve body 11f. In addition, two are provided on each of the inclined surfaces located at one end of the divided valve body 11e (see FIG. 3).
As shown in FIG. 4 (b), each elastic buffer means 42 includes a recess 33 formed on the inclined surface of the divided valve body 11d, the inclined surface of the divided valve body 11e, or the inclined surface of the divided valve body 11f, An elastic buffer member 44 provided in the recess 33 is provided.
The elastic buffer member 44 includes a soft material (for example, resin) 34 disposed on the back side (bottom side) of the recess 33, and a sliding material (for example, Mitsubishi Stellite NO) disposed on the surface of the soft material 34. .1 (registered trademark)) 43.

According to the valve device according to the present embodiment, when the valve body 11 is opened or closed, the inclined surface of the divided valve body 11d, the inclined surface of the divided valve body 11e, or the inclined surface of the divided valve body 11f is a sliding material. 43 moves along the surface of 43, and wear due to sliding between the divided valve bodies 11d, 11e, and 11f can be reduced. That is, the wear resistance of the divided valve bodies 11d, 11e, and 11f can be improved.
Other functions and effects are the same as those of the second embodiment described above, and thus the description thereof is omitted here.

4th Embodiment of the valve apparatus by this invention is described using FIG.4 (c).
The valve device in the present embodiment is different from that in the third embodiment described above in that an elastic buffering means 52 is provided instead of the elastic buffering means 42 described in the third embodiment. Since other components are the same as those of the third embodiment described above, description of these components is omitted here.

Similarly to the third embodiment, two elastic buffering means 52 are provided on each of the inclined surface located at the other end of the divided valve body 11d and the inclined surface located at the other end of the divided valve body 11f. In addition, two are provided on each of the inclined surfaces located at one end of the divided valve body 11e (see FIG. 3).
As shown in FIG. 4 (c), each elastic buffering means 52 includes a recess 33 formed on the inclined surface of the divided valve body 11d, the inclined surface of the divided valve body 11e, or the inclined surface of the divided valve body 11f, It has an elastic buffer member 54 provided in the recess 33.
The elastic cushioning member 54 is a leaf spring 55 (for example, made of metal) disposed on the back side (bottom side) of the recess 33 and a sliding material (for example, Mitsubishi) disposed on the surface side of the leaf spring 55. Wear resistant metal material such as Stellite NO.1 (registered trademark)) 43.

According to the valve device according to the present embodiment, when the valve body 11 is closed, the split valve body 11d is moved to the valve seat 21 by the spring action of the leaf spring 55 (the spring action larger than that of the elastic buffer member 34 described above). The divided valve body 11f can be brought into close contact with the valve seat 20 with a stronger force.
Further, the inclined surface of the divided valve body 11e can absorb more impact force when coming into contact with the inclined surface of the divided valve body 11d and the inclined surface of the divided valve body 11f. It is possible to more reliably prevent the position shift of 11f and the generation of impact sound.
Other functions and effects are the same as those of the above-described third embodiment, and a description thereof is omitted here.

5th Embodiment of the valve apparatus by this invention is described using FIG.
The valve device in the present embodiment is the second embodiment described above in that any one of the elastic buffer members 32, 42, 52 described above includes the valve body 51 provided in the form shown in FIG. Or different from that of the fourth embodiment.
That is, two elastic buffer members 32, 42 and 52 in this embodiment are provided on each of the inclined surface located at the other end of the divided valve body 11d and the inclined surface located at the other end of the divided valve body 11f. In addition, one is provided on each of the inclined surfaces located at one end of the divided valve body 11e.
As shown in FIG. 5, the recess 33 of each elastic buffering means 32, 42, 52 is a recess having a rectangular shape in plan view and a rectangular shape in sectional view (see FIG. 4).
In addition, in the recess 33, similarly to the recess 33, any one of the elastic buffer members 34, 44, and 54 having a rectangular shape in plan view and a rectangular shape in sectional view is disposed.

  According to the valve device according to the present embodiment, since the surface areas of the elastic buffer members 32, 42, 52 are increased, the inclined surfaces of the divided valve bodies 11d, 11e, 11f and the elastic buffer members 32, 42, 52 are provided. The contact area with the surface of the valve can be increased, and the impact force when coming into contact with the inclined surface of the divided valve body 11d and the inclined surface of the divided valve body 11f can be absorbed more than in the above-described embodiment. Thus, it is possible to prevent the displacement of the split valve bodies 11d and 11f due to impact and the generation of impact sound.

6th Embodiment of the valve apparatus by this invention is described using FIG.
In the valve device according to the present embodiment, any of the elastic buffer members 32, 42, and 52 described above is provided on an inclined surface located at one end of the divided valve body 11d and an inclined surface located at one end of the divided valve body 11f. The second embodiment to the second embodiment described above in that two each are provided and one valve body 61 is provided on each inclined surface located at the other end of the divided valve body 11e. Different from that of the fourth embodiment.
Further, substantially the entire surfaces (surfaces opposite to the inclined surfaces) of the divided valve bodies 11d and 11f are covered with an elastic material 62 (for example, carbon or the like).

According to the valve device according to the present embodiment, it is possible to increase the contact area between the surfaces of the divided valve bodies 11d and 11f and the surfaces of the elastic cushioning members 32, 42, and 52, as compared with the above-described embodiment. The impact force at the time of contacting with the inclined surface of the divided valve body 11d and the inclined surface of the divided valve body 11f can be absorbed, and the displacement of the divided valve bodies 11d and 11f due to the impact and the generation of impact sound are prevented. Can do.
For example, as shown in FIG. 3, two elastic buffering means 32 are provided on each of the inclined surface located at the other end of the divided valve body 11d and the inclined surface located at the other end of the divided valve body 11f. In addition, two are provided on each inclined surface located at one end of the divided valve body 11e.
As shown in FIG. 4 (a), each elastic buffer means 32 includes a recess 33 formed in the inclined surface of the divided valve body 11d, the inclined surface of the divided valve body 11e, or the inclined surface of the divided valve body 11f, It has an elastic buffer member 34 provided in the recess 33.
The recess 33 is a recess having a circular shape in plan view (see FIG. 3B) and a rectangular shape in sectional view (see FIG. 4A).
The elastic buffer member 34 has a circular shape in plan view and a rectangular shape in sectional view, like the recess 33, and protrudes from each inclined surface so that its height is greater than the depth of the recess 33. It consists of a soft material (for example, resin etc.) formed so that it may do.

According to the valve device according to the present embodiment, the elastic material 62 that is provided on each surface of the divided valve bodies 11d and 11f and easily deforms, and the valve seats 20 and 21 come into contact with each other. Therefore, when the divided valve body 11d is brought into close contact with the valve seat 21 and the divided valve body 11f is brought into close contact with the valve seat 20 in a state where the valve body 11 is closed, the degree of adhesion between the divided valve body 11d and the valve seat 21; The degree of adhesion between the divided valve body 11f and the valve seat 20 can be further improved, and the sealing performance can be further improved.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

1 is a schematic sectional view showing a first embodiment of a valve device according to the present invention. It is an enlarged view of the valve body part in FIG. It is an enlarged view of the valve body part which shows 2nd Embodiment of the valve apparatus by this invention, Comprising: (a) is sectional drawing of the valve body part in an open state, (b) is a side view of (a). is there. It is the enlarged view which expanded the part of the elastic buffer means in FIG. 3, Comprising: (a) is a figure which concerns on 2nd Embodiment of the valve apparatus by this invention, (b) is 3rd Embodiment of the valve apparatus by this invention. The figure which concerns, (c) is a figure which concerns on 4th Embodiment of the valve apparatus by this invention. It is an enlarged view of the valve body part which shows 5th Embodiment of the valve apparatus by this invention, Comprising: (a) is sectional drawing of the valve body part in an open state, (b) is a side view of (a). is there. It is an enlarged view of the valve body part which shows 6th Embodiment of the valve apparatus by this invention, Comprising: (a) is sectional drawing of the valve body part in an open state, (b) is a side view of (a). is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Valve apparatus 11 Valve body 11c Inclined surface 11d Divided valve body 11e Divided valve body 11f Divided valve body 14 Valve box 14c Fluid passage 20 Valve seat 21 Valve seat 32 Elastic buffer means 42 Elastic buffer means 52 Elastic buffer means 62 Elastic material

Claims (3)

A valve box provided with a fluid passage;
A valve body that is provided to block the fluid passage and opens and closes the fluid passage;
A valve seat that is provided in the valve box and seals a gap between the valve body and the fluid passage;
The valve body is formed by combining valve bodies that are divided into three through an inclined surface so that the inclined surface is in contact with each other, and in the inclined surface, a valve body that is located in a central portion and valve bodies that are located on both sides thereof are arranged. A valve device configured to change a width in a fluid flow direction by sliding relatively.   2. The valve device according to claim 1, wherein an elastic buffer means is provided on the inclined surface.   The valve device according to claim 1, wherein an elastic material is provided on a surface of the valve body facing the valve seat.

Images