JP2008309224A - Ball valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball valve in which flange parts and the flow passage sides of a body coming into contact with fluids are made of superalloys, such as titanium. <P>SOLUTION: In the ball valve 10 which includes a ball-type valve element 20, a main body 30, and the flange parts 40, the flange part 40 comprises a valve main body end 30a made of titanium, a cylindrical shaped end flange 50 having a cylindrical space, and a flange plate 60 which is a disc shaped plate having a hollow and made of titanium. The end flange 50 is fitted onto the outer periphery of the main body end 30a. While the flange plate 60 is welded to the fluid inlet side and the fluid outlet side of the main body end 30a, the main body end 30a, the end flange 50, and the flange plate 60 are fixed by bolts 42. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a valve used in a plant, and more particularly to a ball valve using titanium or a titanium alloy in a fluid contact portion.

  The ball valve is a valve that is used in a wide range of applications because it does not easily generate vortex or pulsation, has excellent flow characteristics, and has a simple structure. Ball valves for high temperature and high pressure plants are required to have higher durability. Therefore, a valve using titanium or a titanium alloy having excellent corrosion resistance, high specific strength, good workability, and excellent durability has been manufactured.

  In a ball valve provided with a flange, a titanium material is used for a flange portion serving as a flow path and a valve main body in contact with fluid. However, although titanium has excellent performance, it is relatively expensive and expensive to process, so the processing cost is high compared to other metals, and as a result, titanium valves become expensive. There was a problem.

  In order to solve the above problem, a technique has been developed that reduces the cost by welding the valve device for each part separately. According to this technique, although the amount of titanium used as a material can be reduced, there is a problem that the assembly becomes complicated if the parts are divided finely. In addition, since a titanium material is used for a portion that does not come into contact with a fluid, such as a flange portion of the valve, it has been desired to develop a valve that reduces the cost by using other metal in this portion. However, there is a problem that even if titanium can be welded together, it cannot be welded to other materials such as stainless steel.

JP 2006-283913 A

  The object of the present invention is to provide a ball valve in which a flange portion in contact with a fluid and a flow path side of a body are formed of a superalloy such as titanium in order to solve the above-described problems.

  In order to achieve the above object, the ball valve flange structure of the present invention has a ball-type valve body that controls the inflow of fluid, a fluid inlet and outlet on both sides, and an inlet in the center. In a ball valve comprising: a body body rotatably equipped with a valve body having a through hole communicating with a flow outlet, and flange portions positioned on both sides of the body body and connected to a pipe. The flange portion comprises a titanium body end, a cylindrical end flange having a cylindrical space, and a flange plate that is a titanium disc plate having a hollow space. The end flange is externally fitted, and the flange plate is welded to the liquid inlet and outlet sides of the body main body end, and the main body end and the end flange And serial flange plate is a structure that is fastened by a bolt.

  In addition, a ball-type valve body that controls the inflow of fluid, and a valve body that has a fluid inlet and outlet on both sides and a through hole that communicates the inlet and outlet at the center are rotated. In a ball valve comprising a body body that is freely mounted, and flange portions that are located on both sides of the body body and are connected to a pipe, the flange portion includes an end portion of the body body made of titanium and a cylindrical space. A cylindrical end flange having a flange, a flange plate that is a titanium disc plate having a hollow, and a hollow disc-shaped gasket, and the end flange is externally fitted to the outer periphery of the end of the body body, The gasket is inserted into the liquid inlet and outlet sides of the body main body end to join the flange plate, and the body main body end and the end flange It said gasket and the flange plate has a structure which is fastened by bolts.

  Further, the outer peripheral edge portion of the flange plate may be connected to the end flange by caulking.

As detailed above, the flange structure of the ball valve according to the present invention is:
1. Since titanium is used for the fluid contact surface of the ball valve, and other materials are made of inexpensive materials other than titanium, the cost can be reduced. In addition, since they are connected by welding and bolts, they are not easily damaged and have excellent strength and durability.
2. Since the gasket is used, liquid leakage can be effectively prevented, and manufacturing is easy and inexpensive, and the cost can be further reduced.
3. By performing not only the bolt but also the caulking process, the coupling is more reliable, and an economical ball valve with reduced cost can be obtained without increasing the number of parts.

Below, the ball valve concerning the present invention is explained in full detail by the example shown in a drawing. FIG. 1 is a sectional view of a ball valve having a flange according to the present invention, and FIG. 2 is a sectional view of a flange portion according to the present invention. FIG. 3 is a sectional view of the flange portion with a gasket interposed.
The ball valve 10 according to the present invention has a structure including a valve body 20, a body main body 30, and a flange portion 40. The body body 30 of the ball valve 10 is provided with an inflow port and an outflow port that serve as a fluid flow path on both sides of the ball valve 10 on the same axis.

  The valve body 20 is a ball-shaped rotary valve body having a structure in which an opening is opened and closed by the rotation of the valve, and the flow of liquid flowing from the inlet is controlled by opening and closing the valve.

  The body body 30 includes a rotary valve body, an inflow port, and an outflow port, and a flow hole that allows the fluid inflow port and the outflow port to communicate with each other is formed in the center thereof. A spherical valve body 20 is rotatably provided in the vicinity of the center of the flow hole.

  As shown in FIG. 1, the flange portion 40 is a connecting piping portion with other pipes on the inflow and outflow sides of the ball valve 10. The flange portion 40 is made of stainless steel and has an end flange 50 that is a thick disk-like plate having a cylindrical hollow in the center in a donut shape, and a circle formed of titanium and provided on the inflow side and / or the outflow side of the end flange. A structure comprising a flange plate 60 which is a thin donut-shaped disk plate having an empty space, and a substantially cylindrical main body end 30a which is inserted into a cylindrical space of an end flange formed of titanium and having a cylindrical void. is there.

The end flange 50 is a cylindrical piping flange having a circular hollow in the center of a donut shape. The end of the body main body positioned on the inlet and outlet sides of the body main body 30 is fitted into the hollow cylinder. A bolt groove for coupling to the body main body is provided on the inner wall side of the end flange 50. Moreover, although not shown, it is a structure provided with the bolt hole for piping for couple | bonding with another pipe | tube.
Since the end flange 50 does not have a risk of deterioration due to contact with a fluid, an inexpensive another metal different from titanium, such as stainless steel or steel material, is used.

The flange plate 60 is a disk-shaped plate having a donut-shaped circular sky as a center, and is provided on the inlet side and the outlet side of the end flange 50. The flange plate 60 is made of titanium and plays a role of preventing deterioration due to fluid on the inlet side and outlet side of the ball valve 10. The material of the flange plate 60 is not limited to titanium, and a superalloy (superalloy) such as high nickel copper or zirconium can be used.
The flange plate 60 is mounted such that the center of the circular sky is coaxial with the cylindrical axis of the cylindrical space of the end flange 50.

The body main body 30 and the flange plate 60 are made of titanium in order to contact the fluid. Further, the body body 30 can be formed of a superalloy such as high nickel copper or zirconium in accordance with the flange plate 60. The flange plate 60 is joined to the body main body end 30a by welding the joint 62 on the inner peripheral wall side forming the donut-shaped circular hollow.
Since titanium and stainless steel are difficult to weld, as shown in FIG. 2, the body main body end 30a, the end flange 50, and the flange plate 60 are formed on the body main body end 30a provided with a bolt groove. Bolts 42 are interposed between the outer peripheral side, the inner peripheral side of the end flange 50 and the hole of the flange plate, and are fixedly coupled.

As shown in FIG. 3, in another embodiment, a gasket 70 is inserted into the joint surface between the body main body end 30 a and the end flange 50 and the flange plate 60. After the gasket is inserted, the end flange 50, the flange plate 60, and the body main body end 30a are bolted and firmly tightened. By using a gasket, it is possible to seal the flange plate 60 and the body main body 30 with a simple structure without requiring welding.
The inflow side and the outflow side of the flange portion 40 may each be a joint structure by welding or a joint structure by inserting a gacket, and the ball valve 10 may be a combination of different joint structures.

Further, the outer peripheral edge portion 66 of the flange plate 60 may be caulked to be coupled to the end flange 50. As shown in FIG. 2, in this embodiment, the outer peripheral edge 66 of the flange plate 60 is caulked so that the end flange protrusion 64 covers it. In addition to bolting, it has a structure in which the connection is made stronger and the sealing performance is improved by caulking.
Since the joining portion 62 and the outer peripheral edge portion 66 are firmly joined by welding and caulking, respectively, durability against water hammer is high.

Sectional view of a ball valve having a flange structure of the present invention Sectional view of the flange structure of the present invention Sectional view of a flange structure according to another embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ball valve 20 Valve body 30 Body main body 30a Main body end part 40 Flange part 42 Bolt 50 End flange 60 Flange plate 62 Joint part 64 Projection part 66 Outer peripheral edge part 70 Gasket

Claims (3)

A ball-type valve body that controls the inflow of fluid, and a valve body that is provided with a fluid inlet and outlet on both sides and a through hole that communicates the inlet and outlet at the center is rotatable. In a ball valve provided with a body body equipped, and flange portions located on both sides of the body body and connected to a pipe,
The flange portion includes a titanium body main body end, a cylindrical end flange having a cylindrical space, and a flange plate which is a hollow titanium disc-shaped plate, and the outer periphery of the body main body end. The end flange is externally fitted, and the flange plate is welded to the liquid inlet and outlet sides of the body body end, and the body end, the end flange, and the flange plate are fastened by bolts. A ball valve characterized by A ball-type valve body that controls the inflow of fluid, and a valve body that is provided with a fluid inlet and outlet on both sides and a through hole that communicates the inlet and outlet at the center is rotatable. In a ball valve provided with a body body equipped, and flange portions located on both sides of the body body and connected to a pipe,
The flange portion includes a body body end portion made of titanium, a cylindrical end flange having a cylindrical space, a flange plate that is a hollow titanium disc plate, and a hollow disc-shaped gasket. The end flange is fitted on the outer periphery of the body main body end, the gasket is inserted on the liquid inlet and outlet sides of the body main body end to join the flange plate, and the body main body end And the end flange, the gasket, and the flange plate are fastened by bolts. 3. The ball valve according to claim 1, wherein an outer peripheral edge portion of the flange plate is coupled to the end flange by caulking.

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