JPS646445Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an angle valve that has a fluid inlet and a fluid outlet that are perpendicular to each other and is installed in a flow path to control the flow rate of fluid.

[Prior art]

An angle valve with a fluid inlet and a fluid outlet perpendicular to each other is known as a type of valve that controls the flow rate of fluid.This type of angle valve is popular in fertilizer plants and other plants because of its smooth flow with little change in flow direction. It is widely used in places such as flue gas desulfurization plants where fluids with a lot of suspended matter or fluids with high viscosity are handled.

FIG. 1 is a vertical cross-sectional view of a conventional angle valve of this type called a tailpiece-less type. This will be explained based on the figure. Flanges 1a and 2a connect the upstream pipe and the downstream The valve body 1 and the seat ring retainer 2, which are respectively connected to the pipe, have flanges 1b and 2b that sandwich the flange protruding from the outer periphery of the seat ring 3 and the gaskets 4 and 4 attached to both sides of the flange. The valve body 1 and the upper cover 6 are joined together by bolts 5 and bolts 7. Top lid 6
A valve shaft 8, which is moved up and down by a drive device (not shown), is supported via a packing 9. In addition, the valve body 1
has a plug 10 integrally connected to the valve shaft 8,
The plug 10 is slidably supported via a plug guide 11, and the tapered head of the plug 10 is engaged with the valve seat of the seat ring 3. By raising and lowering the valve shaft 8 using a drive device, the head of the plug 10 moves forward and backward relative to the valve seat, thereby controlling and shutting off the flow of fluid flowing from the inlet on the flange 1a side to the outlet on the flange 2a side. It will be done.

By the way, in such an angle valve,
For example, when urea is used as a fluid in a fertilizer plant, it is required to use special materials such as titanium and low-carbon stainless steel as the valve material. On the other hand, the above specifications tend to avoid threading in narrow gaps, especially in the areas facing the inside of the valve, so that the fluid does not remain in the valve. Therefore, instead of directly screwing the seat ring 3 to the valve body 1 as shown in the figure, the seat ring holder 2 is used, which is screwed to the valve body 1 by sandwiching the seat ring 3, and is fixed by tightening it from the outside of the valve. In this case, in the conventional structure, the seat ring holder 2 forms a part of the flow path, so a large part is required for pressure resistance, and as mentioned above, the same expensive special material as the valve body 1 and the seat ring 3 is required as the material, so there was a disadvantage that the cost burden in this area was extremely large.

[Summary of the idea]

The present invention was developed in view of the above points, and the valve seat part of the flanged seat ring is inserted into the valve seat hole of the valve body through packing and temporarily fixed with bolts, and the flange of the seat ring and this By configuring the flange of the external piping that is pressed into contact with the valve body to be fully tightened with a separate bolt, the conventional seat ring holder is omitted and the seat ring is directly assembled and fixed on the external piping, making it especially convenient. When using high-grade materials, material costs can be greatly reduced, the entire valve can be made smaller, the degree of freedom in connecting piping can be increased, and the structure can be simplified by reducing the number of parts. The present invention provides an angle valve in which the closing accuracy of the valve is ensured by providing a press-contact step part for supporting external forces such as clamping force on the joint end surface of the ring on the valve body side. Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 2 is a longitudinal sectional view showing an embodiment of the angle valve according to the present invention. In the figure, the valve body 21 is integrally formed with an arc-shaped fluid passage 21a and flanges 21b and 21c that are perpendicular to each other at both ends thereof, and an external pipe (not shown) is connected to one flange 21b. Also, the other flange 2
A stepped valve seat hole 22 is opened in 1c.
Furthermore, another flange 21d having a stepped guide hole 23 coaxial with the valve seat hole 22 is integrally formed on the upper part of the valve body 21, and this flange 21d has the following features:
The flange of the upper lid 24 is joined and fixed with a plurality of bolts 25. The reference numeral 26 is a plug guide with a flange, which is fitted into the stepped guide hole 23, and the flange and the valve body 2 are connected to each other.
1. The upper lid 24 is fastened together with the bolts 25 with gaskets 27 and 28 interposed between the upper lid 24 and the upper lid 24. Further, a plurality of packings 30 are stacked and loaded into the inner hole 29 of the top cover 24, and are pressed and fixed by a packing presser 31 which is fixed to the upper end surface of the top cover 24 with bolts so as to be movable up and down.

The plug indicated by the reference numeral 32 is pivotally supported by the plug guide 26 so as to be able to move up and down, and its lower end head is formed into a tapered shape, and a shaft hole 33 is bored in the shaft core from the upper end surface. It is set up. A valve shaft 35 having a connecting screw 34 at its upper end is inserted into the shaft hole of the packing presser foot 31, and its lower end is inserted into the shaft hole 33 of the plug 32 to connect the knock pin 3.
6, and the central portion is pivotally supported by a packing 30. On the other hand, an operation section (not shown) above the upper lid 24 connects the threaded portion of the lower end of the yoke to the upper lid 24.
It is supported by being screwed into the connecting screw 37 at the upper end, and the working end of the actuator stem provided in this operating section connects to the valve shaft 3 through the stem connector.
It is screwed into the connecting screw 34 of No. 5. The valve shaft 35 and the plug 32 are raised and lowered together by raising and lowering the actuator stem of the operation section using a driving member such as a diaphragm.

The reference numeral 38 is a seat ring made of low carbon stainless steel, and is attached to the valve body 2.
a flange 38a having the same diameter as the flange 21c of No. 1;
It is integrally formed with a valve seat part 38b having the same diameter as the large diameter part and the small diameter part of the stepped valve seat hole 22, and the flange 38 is formed by fitting the valve seat part 38b into the valve seat hole 22.
a is joined to a flange 21c. A packing 39 is inserted between the stepped portion of the valve seat hole 22 and the stepped portion of the valve seat portion 38b, and the flange 38a and the flange 21c are made of a plurality of temporary pieces with their heads depressed. It is fixed with a locking bolt 40. The joint surface of the flange 38a on the valve body 21 side supports external forces such as the tightening force of the temporary fixing bolts 40 and the final tightening bolts 43, which will be described later, so that the insertion annular space of the packing 39 is not reduced in the thickness direction. A stepped portion 38c for pressure contact is formed. The valve seat portion 38b of the seat ring 38 is provided with a valve seat 41 that opens and closes as the plug 32 moves up and down.
is provided. What is indicated by the reference numeral 42 is a pipe on the outlet side, and its flange 42a is joined to the flange 38a of the seat ring 38, and the three flanges 42a, 38a, 21c are planted on the flange 21c, and the flange 38a, It is integrally fixed by a plurality of stud-type final tightening bolts 43 and nuts 44 that pass through 42a.
As a result, the seat ring 38 and the pipe 42 are firmly fixed to the valve body 21. The temporary tightening bolts 40 and the final tightening bolts 43 are disposed at positions that equally divide the circumference and are out of phase with each other in the circumferential direction.

In the angle valve configured as above,
Fluid flowing from the upstream piping connected to the flange 21b flows through the fluid passage 21a and the valve seat 41 to the downstream piping 42. By driving the actuator stem of the operating section to move it up and down, the valve shaft 35 connected to its working end moves up and down, and the valve seat at the tip of the plug 32, which is integrated with this, opens and closes the valve seat 41. The flow rate of the fluid is controlled, and the flow path is closed by fully closing the valve seat 41.

And the seat ring 38 is attached to this angle valve 21.
When assembling the valve seat hole 22 and the piping 42, insert the packing 39 from below into the stepped seat of the valve seat hole 22, press it with the seat ring 38, and then tighten the seat ring 38 with the temporary bolt 40. Temporarily fix it to the valve body 21. In this case, the temporary bolt 40 only needs to be able to resist the closing force of the valve seat 41 by the plug 32. Furthermore, the stepped portion 38c provided on the seat ring 38 serves as a guide for the tightening force when tightening the temporary bolt 40. After temporarily fixing in this way, the piping 42 is joined to the flange 38a of the seat ring 38, and the stud-shaped final tightening bolt 43 screwed into the flange 21c on the valve body 21 side is attached to the flange 38a,
By inserting the nut 44 into the bolt hole 42a and tightening it, the valve body 21, the seat ring 38, and the piping 42 are firmly fixed. In this case, by providing the stepped portion 38c,
The tightening force of the main tightening bolt 43 is supported by the pressure contact surface of the stepped portion 38c, and the annular space in which the packing 39 is inserted is not compressed by over-tightening, which prevents the valve seat from being over-tightened. 41
The axial position of the valve can be accurately obtained, ensuring valve closing accuracy. In this way, the final pressing force of the seat ring 38 to the valve body 21 is obtained by the tightening force of the final tightening bolt 43, and at this time, it can withstand the pressurization by the internal fluid.

In this embodiment, a stud bolt is used as the final tightening bolt 43, but a through bolt may also be used.

[Effect of idea]

As is clear from the above description, according to the present invention, in an angle valve, a seat ring with a flange is used, and the valve seat part of the seat ring is inserted into the valve seat hole of the valve body with a packing interposed, and is secured by a bolt. At the same time as temporary fixing, the flange of this seat ring is sandwiched between the valve body and the flange of the external piping that is pressed into contact with it, and the whole is assembled and fixed as one by fully tightening with another bolt. Therefore, the conventional seat ring holder is omitted and the seat ring is directly assembled and fixed to the valve body using the flange of the external piping on the other side, reducing the number of components for fixing the seat ring. The structure is simplified, and
It is possible to downsize the entire valve by the amount of the seat ring presser, and there is an advantage that there is a greater degree of freedom in connecting piping. In addition, according to the present invention, when the fluid used is special and the fluid passage requires the use of special materials such as titanium or stainless steel, the seat ring itself becomes larger, but it is not possible to use a conventional large member. The material cost can be reduced by omitting a certain seat ring holder, and this is an effect that cannot be ignored, especially when using high-grade materials. Furthermore, according to the present invention, a stepped part for pressure welding that supports external forces such as bolt tightening force and piping stress is provided on the joint end surface of the seat ring on the valve body side, so that unnecessary packing due to these external forces is avoided. The valve seat of this seat ring is compressed to
There is also an advantage that positional deviation occurs in the valve body in the axial direction, and relative positional deviation with the plug on the valve shaft side can be prevented, and valve closing accuracy can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional angle valve, and FIG. 2 is a vertical cross-sectional view showing an embodiment of the angle valve according to the present invention. 21... Valve body, 22... Valve seat hole, 38... Seat ring, 38a... Flange, 38b... Valve seat portion, 39... Packing, 40... Temporary fixing bolt, 42... Piping, 42a... ...Flange, 43...
...Final tightening bolt.

Claims (1)

[Scope of utility model registration request] A seat ring 38 having a flange 38a on an exposed portion with a valve seat portion 38b inserted into the stepped valve seat hole 22 of the valve body 21, and a large diameter of the stepped valve seat hole 22 from the insertion direction of the seat ring 38. A packing 39 is inserted into an annular space between the stepped seat and the stepped portion of the valve seat portion 38b of the seat ring 38.
, bolts 40 for temporarily fixing the flange 38a of the seat ring 38 to the valve body 21, and the flange 42a of the external pipe 42 that is pressed against the flange 38a of the seat ring 38 and its outer end surface, together with the valve body 21. A bolt 43 for final tightening is provided for tightening and fixing, and the bolt 4 is provided at the joint end surface of the seat ring 38 on the valve body 21 side so as not to reduce the annular space in the thickness direction.
Pressure welding step part 3 that supports the clamping force of 0.43
An angle valve characterized by forming an 8c.