JPH0893943A - Ball valve - Google Patents

Abstract

PURPOSE: To provide a ball valve which is resistant to a high pressure fluid and has a sure sealing effect in which a valve element integrated with a valve shaft can be easily installed to a valve box while centering. CONSTITUTION: A trunnion type valve element 5 integrated with valve shafts 9, 9a is installed to valve boxes 1, 1a halved in an inclined surface never containing valve bearing parts 3, 3a through the spherical center of the valve element 5. The valve element 5 is formed of a block part 7 larger than the semi-spherical body and smaller than the whole spherical body and the remaining notch part 8, and mutually fitting faucet parts 11, 11a are on the inclined surfaces of the halved valve boxes. When the valve element 5 is thus installed to the valve boxes, it can be centered by the faucet parts and also surely sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve in which a valve body is loaded in a valve body divided into two parts.

[0002]

2. Description of the Related Art As a ball valve, a structure in which a valve body is loaded in a valve box and a fluid passage is opened and closed by rotation of a valve shaft is publicly known. The basic structure is that the valve body of the cast sphere is provided with an opening communicating with the fluid passage, and the valve seat provided in the valve box seals to prevent liquid leakage, and the opening and closing operation is performed by rotating the valve shaft. Has become.

Normally, the valve housing is divided into two parts except the valve bearing portion, the valve body is loaded into the valve housing and sealed by the valve seat, but the valve housing passes through the spherical center. There are also known examples in which division is performed by an inclined surface, for example, Japanese Utility Model Publication No. 34-8087 and Japanese Utility Model Publication No. 53-9949. Japanese Patent Laid-Open No. 62-233573 discloses an example in which the valve element of the ball valve is integrated with the valve shaft. Further, as a known example in which the valve element is a hemisphere, the above-mentioned Japanese Patent Laid-Open No.
In addition to JP-A No. 2-323357, Japanese Utility Model Laid-Open No. 52-14443
No. 4 publication and the like.

[0004]

In the above known example, in the structure in which the valve box is divided by the inclined surface passing through the spherical center,
The valve body and the valve shaft are separately provided, and after the valve body is loaded into the valve box, the valve shaft is engaged with the built-in valve body. Further, in the case where the valve body and the valve shaft are integrated, after inserting the valve body into the valve box, it is necessary to assemble a separate part having a valve bearing portion into the valve box, and an example using a hemispherical valve body Also, in this method, the valve bearing portion is attached as a separate component, or the valve box is divided into two parts along a plane passing through the center line of the valve shaft and incorporated.

The above-mentioned construction is adopted in which the ball valve is loaded with a valve body as a spherical body in a valve box with a minute gap and sealed with a valve seat to withstand high temperature and high pressure of fluid, Moreover, the structure is such that the valve shaft rotates to open and close the fluid passage. Therefore, except for a configuration in which the valve box is divided into two parts by a plane passing near the center line of the valve shaft, a spherical part in which the valve shaft and the valve body are integrally formed is loaded into the valve box by the spherical portion. It is considered impossible because it contacts the inner wall of the box.

Further, even if the valve element is a hemisphere, there is a problem that the spherical surface portion contacts the inner wall of the valve box. The object of the present invention is to solve the above problems, and a valve box in which a trunnion type valve body integrated with a valve shaft passes through a spherical center of the valve body and is divided into two by an inclined surface not including a valve bearing portion. An object of the present invention is to provide a ball valve that can be easily loaded into the inside of the ball valve, can be centered at the same time as loading, and has a sealing action that withstands a high-pressure fluid and does not cause liquid leakage.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a valve body, which is loaded in the valve box with a minute gap and sealed by a valve seat, is rotated by a valve shaft to rotate the valve box. In the ball valve that opens and closes the fluid passage of
The valve box has a flange part that passes through the spherical center of the valve body and is divided into two by an inclined surface that does not include the valve bearing part, and has a flange part that engages with each other. A direction orthogonal to the fluid passage in both of the two divided valve boxes. Each of the valve bearings is provided with a valve bearing portion, and the valve element is a sphere that is larger than a hemispherical surface and smaller than a perfect spherical surface. The valve shaft is formed integrally with both end portions of the valve body on a straight line passing through the spherical center of the valve body, is provided so as to be insertable into the valve bearing portion, and has a spherical portion of the valve body. The valve shaft so that it does not contact the inner wall of the valve box, insert one of the valve shafts into one of the two valve bearings of the valve box, and insert the other of the valve shafts into the other of the two valve boxes. , The valve body is loaded into the valve box with the spigot portion facing the inclined surface of the split valve box, and the valve seat is inserted. Ball valve made by fastened in the flange portion by.

According to the second aspect of the invention, the inclination angle (α) of the inclined surface of the two-part valve box is 25 degrees with respect to the valve axis center line XX.
The ball valve was in the range of 45 degrees. In the third invention, with respect to the inclination angle (α) of the inclined surface of the valve box divided into two,
A ball valve having an inclination angle (β) of the peripheral edge portion of the spigot portion in the range of 70 ° to 45 ° was used.

[0009]

In the first aspect of the present invention, the valve body integrated with the valve shaft is easily formed by the trunnion system by dividing the valve box into two parts by the inclined surface that passes through the spherical center of the valve body and does not include the valve bearing portion. At the same time, the spigot part provided on the sloping surface that was split in two was fitted to allow natural centering. Since a valve bearing portion is formed in each of the two-split valve boxes and is orthogonal to the fluid passage, it does not move to the opposite side even if the high-pressure fluid acts on the mounted valve element.

Further, by making the valve body a spherical body larger than the hemisphere (greater than 180 degrees) and smaller than the perfect spherical surface, the spherical portion has a range wider than the 180 degree angle, and the valve seat is loaded in the valve box. As a result, the sealing action is ensured. That is, since the valve seat is in contact with the valve body even when fully opened, the valve seat is not deformed. When the conventional valve body has a spherical surface of 180 degrees or less, a part of the valve seat may not come into contact with the valve body when fully opened, which may cause deformation of the valve seat. Further, since the valve body is integrated with the valve shaft and has a centering action so that the valve body loaded in the valve box is surely set to the spherical center position, the valve shaft and the valve body are different from those of the conventional valve body. There are no drawbacks such as leakage of liquid due to the displacement of the engaging portion with the valve, deformation of the valve seat, and inclination of the valve shaft and the spherical center of the valve element to hinder the sealing action.

In order to insert the valve body into the two-split valve box, it is necessary that the spherical portion of the valve body does not come into contact with the inner wall of the valve box. First, the notch of the valve body is directed toward the fluid passage side. One of the valve shafts is pushed into the valve bearing part of the valve box, and then the notch of the valve body is rotated to face the other side (for example, 180 degrees), and the other of the valve shafts is used for the valve of the other two-split valve box. It suffices to insert it in the bearing part and tighten the flange part of the inclined surface together so that it can be easily assembled.

In the second aspect of the invention, the inclined surface of the divided valve box passes through the spherical center of the valve element and is set at 25 to 45 degrees with respect to the valve axis center line (XX line). It is easy to insert a spheroid that is larger than the body, and the sealing action of the valve seat is secure,
Assembly and disassembly of the ball valve has become easier. In the third aspect of the invention, the inclination angle (β) of the peripheral edge portion of the spigot portion is 70 degrees to 4 with respect to the inclination angle (α) of the inclined surface of the valve box divided into two.
Since the range is 5 degrees, the fitting of the spigot portion can be smoothly performed, and the centering can be easily performed only by fastening and fixing the spigot portions together.

[0013]

Embodiments will be described below with reference to the drawings shown as embodiments. 1 to 3 are views showing a state in which a valve shaft of a trunnion type valve body is started to be inserted into one of two split valve boxes, and 1 is a valve box having a fluid passage 2 and a valve bearing portion 3. Then, it passes through the spherical center O at the position where the valve body 5 is loaded, and is divided into two by the inclined surface S that does not include the valve bearing portion 3. 4 is a flange part, 2
It was provided on the edge of the inclined surface so that the split valve box could be engaged.
10 indicates a valve seat. 1a is the other valve box divided into two,
2a indicates the other fluid passage, 3a indicates the other valve bearing portion, and 4a indicates the other flange portion.

The valve body 5 is larger than a hemispherical surface (larger dimension h ₁ ) and smaller than a perfect spherical surface, and has an opening 6 adjacent to the opening 6 communicating with the fluid passages 2 and 2a of the valve box. It is composed of a closed portion 7 and the remaining cutout portion 8. The valve body 5 is integral with the valve shafts 9 and 9a, and may be integrally molded or manufactured separately and integrated by bolts or welding. 10 is a valve seat. The spigot parts 11 and 11a are provided on each of the two planes. 12 is a packing groove, and 13 is a hole provided in the flange portion.

In order to load the valve body 5 into the two divided valve boxes 1 and 1a, the spherical portion of the valve body must be positioned so as not to contact the inner wall of the valve box. Therefore, first, with the cutout 8 of the valve body 5 facing the fluid passage 2 side, the integral valve shaft 9 is inserted into the valve bearing portion 3, and then the valve body 5 is rotated to the opposite side to cutout the cutout. Inserting the valve shaft 9a into the valve bearing portion 3a of the valve housing 1a with 8 as the fluid passage 2a side, aligning the flange portions 4 and 4a, and tightening and fixing. By matching the spigot parts 11 and 11a, the flange parts 4 and 4a can be centered and tightened simultaneously with tightening. In the packing groove 12,
Insert (install) the packing to seal the fluid. The flanges 4 and 4a are tapped on one side and
Tighten with a hexagon socket head cap screw. Also, a method such as clamp connection or cap nut connection can be used.

The calculation for the angle of the inclined surface that divides the valve box into two is shown below. In FIG. 1, φG = diameter of valve body φD = diameter of hole for loading valve body of valve box h ₁ = dimension of a portion larger than hemisphere of valve body h ₂ = hole of valve box when valve body is inserted Dimension from the center of the valve body when hitting h ₃ = Same as above, dimension from the center of the valve box h ₄ = Same as above, Center deviation of the center of the valve box H = Inner diameter of the valve box at h ₄ position I Dimension If the valve body comes into contact with the hole in the valve box when inserted,

[0017]

[Equation 1]

D ₁ is the cross-sectional outer diameter of the spherical diameter of the valve body at h ₁ , and d ₂ is the contact dimension of the valve body at the contact portion h ₂ of the valve body. Next, the size of the inner diameter of the valve box when the valve body and the inner diameter of the valve box contact each other is calculated.

[0019]

[Equation 2]

H indicates the inner diameter of the valve box at the h ₄ position. From the above equation, H> d ₂ must be satisfied so that the valve body does not come into contact with the inside of the valve box during insertion. On the other hand, the angle α of the inclined surface with respect to the center line of the valve shaft is desired to be less than 45 degrees because it is necessary to provide a valve seat mounting portion. Considering this with the center line X-X line of the valve shaft as a reference, 45 ° ≧ α ≧ 2
5 ° is desirable.

From the above equation (6), when α becomes large, H becomes large, and when α becomes large, there is a margin. Since there is a relationship between the ball seat and the valve shaft, α = (35 ± 5) degrees is considered appropriate. On the other hand, for the inclination angle β, β <
If it is (90 ° -α), in FIG. 1, when the valve box 1 and the valve box 1a are fitted together, the tips of the spigot parts 11 and 11a come into contact, and the valve box cannot be assembled, or , Pry it in and assemble.

Therefore, the inclination angle β is β = (90 ° -α)
Alternatively, it is necessary that β> (90 ° −α). However, if the inclination angle β is too large, the effect of centering when the valve box is fitted is diminished, so it is desirable to allow a margin of up to about 5 degrees. Therefore, it is appropriate that the inclination angle β is in the range of (90 ° −α) ≦ β ≦ (90 ° −α) + 5 °.

Therefore, when the inclination angle α of the inclined surface of the valve box is in the range of 25 to 45 degrees with respect to the valve axis center line XX, the inclination angle β is in the range of 70 to 45 degrees. An angle is appropriate.

[0024]

According to the first aspect of the present invention, a trunnion type valve body that is integral with a valve shaft can be easily loaded into a valve box that is divided into two parts. Since the valve body is larger than a hemisphere, the valve seat seals the seal. Is also ensured, and there is no defect that liquid leakage occurs even in high-pressure fluid or that the valve body moves to the opposite side, which hinders the operation of the valve shaft. In addition, the valve body can be easily loaded and disassembled, and the spigot part can be centered at the same time as loading, and it can be easily disassembled and cleaned so that it can be used for various fluids.

According to the second aspect of the invention, the valve body integrated with the valve shaft can be easily inserted by inserting it into the valve box, and the angle of the inclined surface of the valve shaft can be 25 to 45 degrees with respect to the center line of the valve shaft. By setting the range to, it becomes possible to arrange the valve seat mounting portion, the structure integrated with the valve shaft, etc. with a sufficient margin, and the sealing effect is also ensured. In the third invention, the spigot portion is provided so as to face the inclined surface of the two-split valve box, and the inclination angle is set to 70 degrees to 45 degrees. Therefore, the valve element can be centered by tightly adhering the inclination surface. It became certain.

By lining or coating the inner surface of the valve box with fluororesin, rubber or the like, it is possible to prevent erosion and wear depending on the fluid to be handled.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state where a valve body integrated with a valve shaft is inserted.

[Fig. 2] Side view of the main part

[Fig. 3] Bottom view of the main part

FIG. 4 is a sectional view of a valve box divided into two.

FIG. 5 is a sectional view showing a state in which a valve body is loaded in a valve box.

[Explanation of symbols]

 1, 1a Valve housing 2, 2a Fluid passage 3, 3a Valve bearing part 4, 4a Flange part 5 Valve body 6 Opening part 7 Closing part 8 Notch part 9, 9a Valve shaft 10 Valve seat 11, 11a Inlay part

Claims (3)

[Claims] 1. A ball valve in which a valve body loaded in a valve box with a small gap and sealed by a valve seat is rotated by a valve shaft to open and close a fluid passage of the valve box. It has a flange portion that passes through the spherical center of the valve body and is divided into two by an inclined surface that does not include the valve bearing portion, and has a flange portion that engages with each other. A bearing is provided, and the valve body is a sphere that is larger than a hemisphere and smaller than a perfect sphere, and has an opening communicating with the fluid passage of the valve box, a block adjacent to this opening, and a remaining notch. The valve shaft is integrally formed on both ends of the valve body on a straight line passing through the spherical center of the valve body, is provided so as to be insertable into the valve bearing portion, and the spherical portion of the valve body is a valve box. Insert one of the valve shafts into one of the valve bearings of the split valve box so that it is not in contact with the inner wall. , The other side of the valve shaft is inserted into the other of the two-divided valve box, and the valve body is loaded into the valve box while being centered by the spigot portion provided opposite to the inclined surface of the two-piece valve box. A ball valve that is tightened and fixed with a flange through a valve seat. 2. The ball valve according to claim 1, wherein the inclination angle (α) of the inclined surface of the two-part valve box is in the range of 25 degrees to 45 degrees with respect to the valve axis center line X-X line. 3. The inclination angle (α) of the inclined surface of the valve box divided in two.
In contrast, the inclination angle (β) of the peripheral edge of the spigot part is 70
The ball valve according to claim 1, wherein the ball valve has a range of from 45 degrees to 45 degrees.