JP2754140B2 - Valve seat ring structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat ring structure for a valve, and more particularly, to a seat that is held between a seat retainer and an outer ring, and the seat is brought into contact with a surface of a closing member such as a ball or disc. A ball valve that seals between the closing member and the seat retainer,
The present invention relates to a seat ring structure of a valve such as a gate valve.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional example of a seat ring structure in a ball valve. In FIG. 3, a ball seat is held between a seat retainer and an outer ring.
FIG. 5 is a partial cross-sectional view of a ball valve in which the ball seat is brought into contact with the surface of the ball to seal between the ball and a seat retainer. In the figure, a ball seat 1 mounted on a step 11a at the tip of a seat retainer 11 is shown.
2 is held between the stepped portion 13a of the outer ring 13 and the set ring 14 locked to the stepped portion 11b of the seat retainer 11 is fastened to the outer ring 13 with a bolt 15, so that the seat retainer 11, the ball seat 12 and The outer ring 13 is integrally assembled.

[0003] Reference numeral 16 denotes a body or a body cap (hereinafter, referred to as a body cap).
17 is a ball, 18 is a spring, 19
And 20 are O-rings, and the ball seat 12 is provided with the surface 1
7a, the space between the ball 17 and the seat retainer 11 is sealed. In this structure, when the valve is closed and a high pressure is applied to the upstream side on the right side in the drawing, the portion of the seat retainer 11 on the left side of the position of the O-ring 19 has the upstream side on the inner diameter side. Since a high pressure is applied and a low pressure of the body cavity 16a is applied to the outer diameter side, the differential pressure acts to spread the seat retainer 11 outward.

FIG. 4 shows a state in which a ball sheet is held between a seat retainer and an outer ring, and the ball sheet is brought into contact with the surface of the ball, as in the above-described example. FIG. 11 is a partial cross-sectional view showing another conventional example of a ball valve that seals a ball. In the figure, a ball seat 22 mounted on a step 21 a at the tip of a seat retainer 21 is attached to a step 2 of an outer ring 23.
3a, and an annular set ring 24 having a cut-out portion at one place on the circumference is attached to the seat retainer 2.
The outer ring 23 is inserted into the inner ring portion 23b of the outer ring 23 by bringing the both ends of the cut-off portion close to each other in the outer peripheral step portion 21b or overlapping and shrinking the both ends to compress and reduce the diameter. The inner diameter groove 23c formed in the inner diameter portion 23b of the seat retainer 21 is released by the instantaneous force to release the compression reduced diameter state, the set ring 24 is fitted into the inner circumference groove 23c, and the front end of the outer circumference groove 21b of the seat retainer 21. It is attached by being locked to the side surface 21c on the side.

[0005] 25 is a body or a body cap (hereinafter referred to as a body cap).
26 is a ball, 27 is a spring, 28
And 29 are O-rings, and the ball seat 22 is provided with a surface 26
a to seal between the ball 26 and the seat retainer 21. In this configuration, the valve is closed,
In the figure, when a high pressure is applied to the upstream side on the right side, a high pressure on the upstream side is applied to the inner diameter side of the portion of the seat retainer 21 on the left side of the position of the O-ring 28 in the figure, On the outer diameter side, the body cavity 25a
Pressure is applied to the seat retainer 2
1 acts to spread outward.

[Problems to be solved by the invention]

However, the conventional example shown in FIG.
It has the following issues. The seat retainer 11 or the outer ring 13 is formed on the inner surface 16 b or 16 of the body 16.
There is no problem with the portion supported in contact with c, but the portion of the seat retainer 11 indicated by H2 in FIG. 3, which is not supported at all, receives a large differential pressure. Moreover, in this structure, H2 is large because the thickness of the set ring 14 and the head of the bolt 15 must be accommodated, and a concave groove 11c is formed to form a step 11b for locking the set ring 14. Need to do
In addition, the strength of this portion is insufficient, and the seat retainer 11 is likely to be deformed and the sealing property to be impaired, or the ball seat 12 is poorly held and tends to pop out. In addition, there is a problem that the entire valve is increased to increase the thickness of the ball seat, the operating torque is increased, and the thickness of the seat retainer is increased to increase the entire valve.

The conventional example shown in FIG. 4 has the following problems. There is no problem with the portion where the seat retainer 21 or the outer ring 23 is in contact with and supported by the inner peripheral surfaces 25b and 25c of the body 25, but the seat retainer 2 indicated by H3 in the drawing is not supported at all.
Since the outer peripheral step portion 21b has a wide step portion in the length direction, this portion receives a large differential pressure. In this structure, H3 is shorter than H2 in the example shown in FIG.
4 is inserted into the inner diameter portion 23b of the outer ring 23 by compressing and reducing the diameter of the outer ring 23, an outer peripheral step portion 21b that is deep and long in the length direction must be formed in the seat retainer 21. The thickness of the portion becomes thinner. For this reason, the strength of this portion is insufficient, and the seat retainer 21 is deformed and the sealing performance is impaired, or the ball seat 22 is poorly held and pops out easily. Further, there is a problem that the entire valve is increased in order to increase the thickness of the ball seat, the operating torque is increased, and the thickness of the seat retainer is increased.

The present invention has been developed in order to solve the above-mentioned conventional problems. The present invention facilitates assembly and disassembly of a valve seat ring structure, and furthermore, manufactures each part to a required size. The purpose of this is to make the seat ring structure compact and durable.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a closing member in which an annular sheet held between an annular seat retainer and an outer ring is brought into contact with a surface of a closing member. A valve configured to seal between the seat retainer and the seat retainer, wherein a concave outer peripheral groove is formed on the outer peripheral surface of the seat retainer, and at least one cut-out portion on the circumference is formed in the outer peripheral groove. The ring-shaped set ring having a compression-diameter is embedded in the compressed state, and the set ring in the non-compressed state is formed on both the inner peripheral groove formed on the inner peripheral surface of the outer ring and the outer peripheral groove of the seat retainer. , And the seat is held by fixing the outer ring to the seat retainer. Further, it is preferable that a plurality of through holes extending from the outer peripheral surface of the outer ring to the inner peripheral groove are formed radially in the radial direction. Further, it is preferable to provide two cut-out portions on the circumference of the set ring.

[0010]

According to the present invention, a seat is mounted on a step portion at a tip end of a seat retainer, a set ring is attached to a concave outer peripheral groove formed on an outer peripheral surface, and a set ring is set so that a cut-out portion of the set ring is brought closer. The outer ring is placed on the sheet so that its inner peripheral surface covers this sheet and pushed in, and the set ring faces the inner peripheral groove formed on the inner peripheral surface of the outer ring. The inner ring is resiliently expanded and inserted into the inner peripheral groove so that the set ring simultaneously engages with both the inner peripheral groove of the outer ring and the outer peripheral groove of the seat retainer.

[0011] The end of the sheet held between the seat retainer and the outer ring in this manner contacts the surface of the closing member, and seals the space between the closing member and the seat retainer. In this case, in order to press the seat against the closing member, the seat retainer and the outer ring are pushed in the direction of the closing member by the force of a spring, and the fluid pressure acts as a pressing force.

In this structure, the seat retainer can be configured such that most of the outer peripheral surface is supported directly or via the outer ring on the inner peripheral surface of the body or the body cap, so that the assembling allowance and the seat compression allowance are reduced. Since the seat retainer cannot be supported only for a short distance, the seat retainer has sufficient strength even if it is thin, and the seat retainer is not deformed and the sealability is not hindered. Since it is not necessary to make the valve thicker, the valve can be made compact, which also leads to a reduction in operating torque.

Next, when disassembling the outer ring and the seat retainer, a plurality of radial through-holes extending from the outer peripheral surface of the outer ring to the inner peripheral groove are used to drive the outer ring into the set by driving a spring pin or the like. By compressing and reducing the diameter of the ring, let it come out from the inner peripheral groove of the outer ring,
Pull out the outer ring from the seat retainer.

[0014]

FIG. 1 is a partial sectional view of a ball valve according to an embodiment of the present invention. In the figure, reference numeral 1 denotes an annular seat retainer, which is located between a body (or body cap) 5 and a ball 6, 2 is an outer ring, 3 is a ball seat, and 4 is a ball seat. Ring-shaped set ring,
7 is a spring, and 8 and 9 are O-rings. The ball seat 3 is held between the seat retainer 1 and the outer ring 2 and abuts against a surface 6a of the ball 6 which is a closing member of the valve so as to seal between the ball 6 and the seat retainer 1. Has become.

An annular set having a concave outer peripheral groove 1b formed in the outer peripheral surface 1a of the seat retainer 1 and having a cut-out portion 4a at one (or two) positions on the circumference as shown in FIG. When the ring 4 is fitted into the outer circumferential groove 1b and the diameter of the set ring 4 is compressed and reduced so that both ends of the cutout portion 4a are close to each other, the set ring 4 can be completely embedded in the outer circumferential groove 1b. This set ring 4 is simultaneously engaged with both the inner peripheral groove 2b formed on the inner peripheral surface 2a of the outer ring 2 and the outer peripheral groove 1b of the seat retainer 1 in an uncompressed state, so that the outer ring 2 is The ball seat 2 is fixed to the seat retainer 1 and held.

A plurality of through-holes 2d indicated by broken lines in FIG. 1 and extending from the outer peripheral surface 2c of the outer ring 2 to the inner peripheral groove 2b are formed radially in the radial direction.

Next, with respect to this embodiment shown in FIG.
The operation will be described. Step 1 at the tip of seat retainer 1
c, the set ring 4 is attached to the outer peripheral groove 1b formed in the outer peripheral surface 1a, and the set ring 4 is compressed and reduced in diameter so that both ends of the cut-out portion 4a of the set ring 4 are close to each other. The outer ring 2 is attached to the ball seat 3 and its inner peripheral surface 2a is
The set ring 4 is made to face the inner peripheral groove 2b formed on the inner peripheral surface 2a of the outer ring 2 and is expanded by its elastic force to enter the inner peripheral groove 2b. 4 are simultaneously engaged with both the inner peripheral groove 2b of the outer ring 2 and the outer peripheral groove 1b of the seat retainer 1. In this case, the outer peripheral surfaces 1 a on both sides of the outer peripheral groove 1 b of the seat retainer 1 are assembled in contact with the inner peripheral surface 2 a of the outer ring 2.

The tip end 3a of the ball seat 3 held between the seat retainer 1 and the outer ring 2 abuts on the surface 6a of the ball 6 as described above, and the space between the ball 6 and the seat retainer 1 is formed. Seal. In this case,
In order to press the ball seat 3 against the ball 6, the outer ring 2 is pressed in the direction of the ball 6 by the force of the spring 7, and the fluid pressure acts as a pressing force.

In this structure, most of the outer peripheral surface of the seat retainer 1 is supported by the inner peripheral surfaces 5b and 5a of the body 5 directly and via the outer ring 2. H1 in the figure is a clearance between the assembling allowance and the compression allowance of the ball seat 3, and since the length of H1 by this small distance is short, the seat retainer 1 has sufficient strength even if it is thin, and the seat retainer 1 has sufficient strength. Since the retainer 1 is not deformed and the sealing performance is not disturbed, and the ball seat 1 does not jump out, and the seat retainer 1 does not need to be thick, the valve can be manufactured in a small size. This leads to a reduction in operating torque.

Next, when the outer ring 2 and the seat retainer 1 are disassembled, a plurality of radial through holes 2 extending from the outer peripheral surface 2c of the outer ring 2 to the inner peripheral groove 2b.
d, the set ring 4 is compressed and reduced in diameter by driving a spring pin into the inner peripheral groove 2 of the outer ring 2.
b, the outer ring 2 is pulled out of the seat retainer 1.

[0021]

As described above, according to the present invention, the seat retainer is not deformed and the sealing property is not impaired, the seat is not held well in the seat ring, and the seat retainer does not fly out. As a result, the entire valve can be manufactured compactly, and the operating torque can be reduced. Therefore, the valve of the present invention can provide a valve with high performance, high reliability, high durability, and excellent economy. Outer peripheral surface of seat retainer
Are provided on both sides of the outer circumferential groove, and the outer circumferential surfaces on both sides are
Because it is fitted and in contact with the inner peripheral surface of the ring,
As shown in H1 below, the gap is shortened
And the bending stress that the seat retainer receives from the inside
The sheet retainer is strong even if it is thin.
Sufficient, seat retainer deforms and seal performance is impaired
It will not be done. Also, from the outer peripheral surface of the outer ring
Whether the through-hole leading to the inner circumferential groove was formed radially in the radial direction
The outer peripheral surface of the seat retainer and the inner peripheral surface of the outer ring
The outer ring and the seat retainer
Effects such as being able to be securely removed from the assembled state with the
There is.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a ball valve which is an embodiment of a seat ring structure of a valve according to the present invention.

FIG. 2 is a front view showing a set ring in FIG. 1;

FIG. 3 is a partial sectional view showing a conventional example.

FIG. 4 is a partial sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat retainer 1a Outer peripheral surface 1b Outer peripheral groove 2 Outer ring 2a Inner peripheral surface 2b Inner peripheral groove 2c Outer peripheral surface 2d Through hole 3 Ball seat 4 Set ring 4a Cutting missing part 6 Ball (closing member)

Claims (2)

(57) [Claims] A valve configured to contact a surface of a closing member with a ring-shaped seat held between a ring-shaped seat retainer and an outer ring to seal between the closing member and the seat retainer. , to form a peripheral groove recessed on an outer peripheral surface of the upper carboxymethyl Toritena, this outer peripheral groove,
An inner circumferential groove in which a ring-shaped set ring having at least one cut-out portion on the circumference is embedded in a compressed and reduced diameter state, and the set ring in a non-compressed state is formed on the inner circumferential surface of the outer ring. and engaged with both the outer peripheral groove of the upper carboxymethyl Toritena, holding the sheet by fixing the upper Kia Utaringu the sheet retainer, the Shitori
The outer peripheral surface of the tena is provided on both sides straddling the outer peripheral groove.
And attach both sides of this seat retainer to the outer ring.
The entire inner circumference is fitted and contacted.
A radially extending through hole extending from the peripheral surface to the inner peripheral groove
Seat ring structure of the valve, characterized in that so as to formed. 2. The cutting of two parts on the circumference of the set ring.
2. The valve seat ring structure according to claim 1, wherein a cutout portion is provided .