JPS5916599Y2 - Ball valve seat - Google Patents

Description

[Detailed description of the invention] This invention relates to the valve seat of a ball valve.It increases the rigidity of the valve seat made of synthetic resin or rubber to prevent deformation, and can be applied to flow control of high-temperature, high-pressure fluids. The purpose is to get used to it.

In general, this type of ball valve has a ball 3 having a communication hole 4 formed in a valve body 1 in which fluid flow passages 2a and 2b are formed along the lines shown in FIG. Further, the operating shaft 8 is erected on the valve body 1 via the gland seal 6 and the gland ring 7, the lower part of this is engaged with the top surface of the ball 3, and the operating handle 8a is attached to the protrusion. The ball 3 is rotated from the outside, and the rotation of the ball 3 opens the fluid flow path 2 of the valve body 1.
The flow rate of fluid is controlled by communicating or blocking communication between a and 2b and the communication hole 4 of the ball 3.

In order to maintain the ball 3 in the intermediate position or the closed position and control the ball valve reliably, the valve seats 5a and 5b must be firmly attached to the valve body 1 to prevent their deformation and ensure a sealing surface. It is necessary to ensure that the outer diameter surface of the ball 3 is in close contact.

By the way, the valve seat 5a. 5b is made of synthetic resin or rubber material to maintain its elasticity, and tends to soften when heated to high temperatures.Moreover, when the ball 3 is rotated to an intermediate position, it flows through the flow hole 4 of the ball 3. The flow rate of the fluid is throttled, and the fluid concentrates on the inflow side of the ball 3 from the primary flow path 2a to the flow hole 4, producing a higher pressure and higher speed fluid flow, which softens the valve seat 5a. , 5b, the valve seats 5a, 5b are deformed in the direction of fluid flow, and the valve body 1 is peeled off, resulting in poor sealing performance.

This problem is more noticeable on the valve seat 5a on the primary side (fluid inflow side) than on the valve seat 5b on the secondary side (fluid outflow side).
As a result, ball valves using valve seats made of synthetic resin, rubber, or the like cannot be used to control the flow rate of high-temperature, high-pressure, and high-speed fluids.

Therefore, as shown in FIG. 2, a reinforcing ring 9 is attached to the outer circumferential surface of the valve seat 5a to prevent deformation, but there are various problems.

That is, when attaching the reinforcing ring 9 to the valve seat 5a, the reinforcing ring 9, which has been bent into an L shape in advance, is attached to the outer circumferential surface of the valve seat 5a, and then attached to the inner circumferential surface of the valve body 1, and then An end 9a of the reinforcing ring 9 is bent inward to hold the valve seat 5a.

However, when bending the reinforcing ring 9, since the reinforcing ring 9 is bent based on the edge of the valve seat 5a, the valve seat 5a is deformed and accuracy deteriorates, so the valve seat 5a must be reprocessed in the installed state after being bent. Workability deteriorated.

Additionally, there were other problems such as poor dimensional accuracy and variations in sealing area.

In view of the above-mentioned conventional drawbacks, this invention was developed to improve and eliminate them, and by attaching an incomplete ring-shaped reinforcing ring with a part of the circumference cut out to the inner and outer circumferential surfaces of the valve seat. This prevents deformation of the valve seat at different positions, improves dimensional accuracy, and equalizes the sealing area.

The configuration of this invention will be explained below according to the embodiment shown in the drawings.

In FIG. 3, 10 is the valve body, 11.12 is the fluid flow passage formed in the valve body 10, and 13 is the valve body 1.
This ball is rotatably mounted inside the valve body 10 and can be rotated from the outside of the valve body 10.

Reference numeral 14 indicates a communication hole formed in the ball 13, and reference numerals 15 and 16 indicate fluid flow passages 11 and 12 of the valve body 10 on both sides of the ball 13.
The valve seat is attached to the inner end of the valve seat 15 to support the ball 13 and seal its surroundings.
．． When closed, the communication hole 14 is perpendicular to the fluid flow path 11.12, and the wall surface of the ball 13 is in close contact with the valve seat 15.16, so that the fluid flow path 1
1.12 is blocked.

For example, as shown in FIG. 4, the valve seats 15 and 16 are fitted with hard reinforcing rings 17 and 18 made of synthetic resin or rubber on the inner and outer peripheral surfaces of the valve seat rings 15a and 16a, which are not affected by heat. It's a combination.

As shown in FIG. 5, the outer reinforcing ring 17 has both edges bent inward to form a U-shaped cross section, and a portion of the circumference is cut out to form an incomplete ring shape. The internal recess 17a of this is the valve seat ring 15a.

16a, and the inner reinforcing ring 18 has both edges bent outward to form a U-shaped cross section as shown in FIG. 6, and a part of the circumference is cut out. It is formed into an incomplete ring shape, and its external recess 18a is formed into a valve seat ring 15a,
A small piece 20 having the same cross-sectional shape and the same radius of curvature as the inner reinforcing ring 18 is fitted into the notch 19, and is attached to the valve seat ring 15a to close the gap. lose.

and reinforcing rings 17 for the valve seat rings 15a and 16a.
The sealing surface facing the balls 13 between the holes 18 is formed in an arc shape and is brought into contact with the wall surface of the balls 13.

In addition, the valve seat rings 15a, 16a and the reinforcing ring 17.1
The mounting surface of 8 to the valve body 10 is the valve seat ring 15 a, 1
A notch is formed in 6a, and the end surfaces of the reinforcing rings 17 and 18 are fitted thereinto so that they are flush with each other.

With the above configuration, the ball 13 is rotated to the middle open position,
The flow rate is restricted, and a very high-pressure, high-speed fluid flow is generated from the fluid flow path 11 on the primary side of the valve body 10 to the inflow side to the flow hole 14 of the ball 13, and this acts on the valve seat 15.16. However, the valve seats 15 and 16 are both protected by hard reinforcing rings 17 and 18 that are not affected by heat, and most of the reinforcing rings 17 and 18 are prevented from moving by the wall surface of the ball 13. The outer peripheral side reinforcing ring 17 and the valve body 1o
Since the valve seats 15 and 16 are not deformed or protruded in the flow direction, the sealing performance is not deteriorated.

Further, the reinforcing rings 17 and 18 are formed into a U-shaped cross section, and a part of the reinforcing rings 17 and 18 are cut out, so that the valve seat rings 15a and 16
It is easy to assemble to the valve body 10, and it is also easy to attach to the valve body 10. Furthermore, the reinforcing rings 17 and 18 set the specified shape and dimensions, and its dimensional accuracy is high, making it easy to reinstall after attaching to the valve body 10. There is no need for machining, and the contact areas of the valve seat rings 15a, 16a with the ball 13 are made uniform throughout, improving sealing performance.

In addition, in order to improve the dimensional accuracy of the reinforcing rings 17 and 18 and the adhesion with the valve seat rings 15a and 16a, auxiliary rings 2 are attached to the circumferential surfaces of the reinforcing rings 17 and 18 as shown in FIG.
1.22 may be installed.

In the above explanation, the reinforcing rings 17 and 18 are attached to both the inner and outer circumferential surfaces of the valve seat rings 15a and 16a, but there are other cases in which the reinforcing rings 17 and 18 are attached only to the outer circumferential surface or only to the inner circumferential surface.
Alternatively, 18 may be attached and used.

These may be appropriately selected depending on the temperature, pressure, and flow rate of the fluid whose flow rate is to be controlled.

Further, the shape of the reinforcing ring is not limited to a specific shape, and may be any shape that provides sufficient rigidity to the valve seat ring.

Furthermore, the reinforcing ring may be provided with a locking portion having a concavo-convex shape to improve the connection between the valve seat ring and the valve body.

As explained above, this invention has a valve seat ring made of synthetic resin or rubber material that supports the ball and seals its surroundings at the inner end of the fluid flow passage of the valve body. An incomplete ring-shaped reinforcing ring with a part of the circumference cut out is attached to the inner and outer peripheral surfaces of the reinforcing ring, and in particular, the cutout part of the reinforcing ring on the inner circumferential side has the same cross-sectional shape as the reinforcing ring on the inner circumferential side, In addition, since the small pieces having the same radius of curvature are fitted, the rigidity of the valve seat ring is improved by the reinforcing ring, and it is formed into a predetermined size and shape, so that the contact area with the ball is approximately uniform throughout, and sealing performance is improved. improves.

In addition, the reinforcing ring does not soften due to heat effects,
Since the valve seat ring is protected, even if the flow rate is restricted and higher pressure and high speed fluid acts on the valve seat, the valve seat ring will not be deformed or ejected in the direction of fluid flow. It is now possible to control fluids at high temperatures, high pressures, and high speeds using ball valves that use valve seats made of synthetic resin or rubber, which was previously impossible.

In addition, since the reinforcing ring is simply fitted to the valve seat ring,
Very easy to assemble and easy to attach to the valve body.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a general ball valve, Fig. 2 is an enlarged sectional view of main parts showing the structure of a conventional valve seat, and Fig. 3 is an assembly structure of the valve seat according to the present invention. Main part sectional view, 4th
The figure is a half-sectional view showing the shape of the valve seat according to the present invention, Figure 5 is a half-sectional view showing the shape of the outer reinforcing ring according to the present invention, and Figure 6 is the shape of the inner reinforcing ring. A half-sectional view showing,
FIG. 7 is a sectional view of a main part showing a state in which an auxiliary ring is attached in addition to a reinforcing ring. 10... Valve body, 13... Ball, 15.16... Valve seat, 15a, 16a...
... Valve seat ring, 17 ... Outer circumference side reinforcement nong, 1
8... Inner peripheral side reinforcement ring, 23... Valve seat.

Claims (1)

[Scope of utility model registration request] At the inner end of the fluid flow path of the valve body, a valve seat ring made of a synthetic resin material such as rubber is attached to support the ball and seal its surroundings. Attaching an incomplete ring-shaped reinforcing ring with a part cut out,
In particular, a valve seat for a ball valve, characterized in that a small piece having the same cross-sectional shape and the same radius of curvature as the reinforcing ring on the inner circumferential side is fitted into a notch of the reinforcing ring on the inner circumferential side.