KR20010004494A - Seat assembly for liquid tightening for ball valve and others - Google Patents

Abstract

PURPOSE: A seat assembly for keeping airtightness is provided to minimize leakage of a fluid due to the inlet of foreign materials and abrasion in a face contacting with an opening and shutting ball by improving a structure. CONSTITUTION: An opening and shutting ball(10) received in a ball valve body(1) and having a fluid hole(2) is interposed between a shaft receiving portion(3) and a stem(4). A pair of caps(5) is fixed on both sides of the ball valve body. A seat ring(50) moves rectilinearly. A solid pillar drive seat(53) made of an abrasion resistant material slides on a reduced circumferential end(52) of the seat ring. A seat spring(51) pressurizes the opening and shutting ball. At least a pairs of O rings(55-58) are placed on the solid pillar drive seat and on the circumference of the seat ring. A hydraulic ring groove(60) for hydraulic operation is formed between the contacting faces of the seat ring and the solid pillar seat. A fluid is communicated to the hydraulic ring groove via an operation hydraulic pressure inlet conduit(70). According to simultaneous or sequential application of elasticity and hydraulic pressure on the opening and shutting ball, airtightness is enhanced.

Description

Seat assembly for liquid tightening for ball valves and others

The present invention relates to an airtight seat assembly such as a ball valve, and more particularly, to provide various configurations of a seat assembly for increasing fluid tightness in various valves such as ball valves, which are fluid control means.

Among the fluid control valves that have been variously designed and used in the related art, ball valves, plug valves, butterfly valves, and the like are widely used for their reliability and ease of operation.

The above valves, in particular ball valves, serve to perform fluid control by blocking or opening the flow of fluid as a rotational opening and closing of a ball for fluid control opening and closing, which is rotated by a vertical rotational operation on a linear fluid flow. do.

Therefore, the fluid opening / closing ball continuously performs repetitive rotation and has a spherical rotation surface, and thus preventing leakage of fluid in the rotational connection surface becomes a main management variable.

Conventionally, in order to prevent the leakage of fluid in the connection surface of the rotating part, the seat ring connected to the spherical opening and closing ball is formed in a pair of ring shapes and mounted on the valve body, and the seat interposed on the seat ring is applied by the force of the spring. Configured to be pressurized.

The above-mentioned conventional configuration for minimizing fluid leakage is configured to connect a pair of seat rings pressurized by a spring from both sides of the opening and closing ball, but with time, wear of the connection surface with the opening and closing ball and elasticity of the spring. As the airtightness is lowered due to the lowering of the coefficient, there is a problem that the leakage of fine fluid is caused on the pivot connection surface.

1 is a cross-sectional view of an exemplary ball valve showing one embodiment of a hermetic seat assembly such as a ball valve of the present invention as compared to a conventional configuration.

2 is an enlarged cross-sectional view of a portion of an exemplary ball valve showing an enlarged right portion of the right side of FIG. 1, which is an embodiment of a hermetic seat assembly such as a ball valve of the present invention;

3 is a cross-sectional view of an exemplary ball valve showing another embodiment of a hermetic seat assembly such as a ball valve of the present invention.

4 is a cross-sectional view of an exemplary ball valve showing another embodiment of a hermetic seat assembly such as a ball valve of the present invention.

Fig. 5 is a sectional view showing the main parts of another embodiment of the airtight seat assembly of the ball valve of the present invention.

* Explanation of symbols for the main parts of the drawings *

1: ball valve body

2: fluid through hole

4: stem

5: cap

10: opening and closing ball

50: seating

53: heavy

55,56,57,58: O-ring

The airtight seat assembly of the ball valve of the present invention aims at minimizing fluid leakage due to wear and connection of foreign matter on the connection surface with the opening and closing ball by improving the conventional structure.

One embodiment of the airtight seat assembly, such as a ball valve of the present invention for achieving the above object;

A spherical opening / closing ball housed in a ball valve body and having a fluid through hole therein is interposed between a lower bearing portion and an upper opening and closing stem to enable rotation within the ball valve body. An airtight seat assembly, such as a ball valve, in which a pair of caps are bolted while receiving a seat ring on both sides;

The seat ring of a ring-shaped body driven in a straight line,

Solid driving seat of the wear-resistant material that slides on the reduced outer diameter end of the seat ring,

Seat spring pressurized in a straight line with respect to the connection surface against the opening and closing ball),

At least one pair of O-rings on the outer diameter portion of the solid driving seat and the seat ring,

Hydraulic operating ring groove which is a hydraulic operation space of the outer diameter groove shape between the seat ring and the connection surface of the solid driving seat,

By including a hydraulic hydraulic inlet pipe in fluid communication with the hydraulic operation ring groove, the solid-state driving sheet is applied to the opening and closing ball simultaneously or sequentially with elasticity and hydraulic pressure to increase airtightness.

With reference to the accompanying drawings, the configuration of the airtight seat assembly, such as the ball valve of the present invention will be described in detail compared with the conventional configuration.

1 is a cross-sectional view of an exemplary ball valve showing one embodiment of a hermetic seat assembly such as a ball valve of the present invention as compared with the conventional configuration, and FIG. 2 is a one of a hermetic seat assembly such as a ball valve of the present invention. 1 is an enlarged cross-sectional view of a part of an exemplary ball valve showing an enlarged right portion of an embodiment of FIG. 1, FIG. 3 is a cross-sectional view of an exemplary ball valve showing another embodiment of a hermetic seat assembly such as a ball valve of the present invention; 4 is a cross-sectional view of an exemplary ball valve showing another embodiment of a hermetic seat assembly such as a ball valve of the present invention, and FIG. 5 is another of a hermetic seat assembly of a ball valve of the present invention. It is sectional drawing of the principal part which shows an Example.

In FIG. 1, the left side of the center line shows a conventional configuration and the right side discloses the configuration of the present invention.

In the drawing, the ball valve B configured in the ball valve body 1 has a spherical opening / closing ball 10 having a two-sided truncated portion at its center portion and a fluid through hole 2 therein. Interposed between the stem 4 for the opening and closing of

The ball valve body 1 is configured to be rotatable inward, and a pair of caps 5 are bolted to both ends of the ball valve body 1 to implement the entire member.

Between the cap 5 and the opening / closing ball 10 supported vertically in the ball valve body 1, the seat ring 20, which is a main part of the present invention, is seated in a ring shape, and the left and right pairs are seated and opened and closed by fixing the cap 5. It is internally fixed while being connected to the ball 10.

Therefore, the seat ring 20 which is the airtight holding structure mentioned above conventionally is widely used as shown in the left figure,

Its configuration was such that the two-stage ring body was connected to the inner surface of the cap 5 via a pair of pressurized seat springs 11 on the upper side and a pair of airtight O-rings 12 on the lower ring portion. .

In addition, the connection surface F of the seat ring 20 is also provided with a sheet 22 in a ring shape as a Teflon material with high wear resistance.

However, the above conventional configuration has been found to have the following important defects.

First, since the seat 22 is connected to the opening / closing ball 10 only by the force of the seat spring 11, the pressing force is not sufficient, and if the foreign matter is interposed over time, the operation is further reduced. have,

The reaction force at the connection point P of the cap 5 of the seat spring 11 causes the rotation moment M with the point P1 as a point to promote abrasion at the connection surface and the seat ring 20. It is a factor to plan early damage.

The airtight seat assembly of the ball valve of the present invention is described with reference to FIG.

{Example 1}

In the present invention, as shown in the figure, the seat ring 50 for performing a linear operation is constituted,

The seat ring 50 is characterized by being provided with an additional operating pressure other than the seat spring (51).

As shown in the drawing, the seat ring 50 is a ring-shaped body formed in a straight line, and has a reduced outer diameter end portion 52 on the front side thereof, and is formed entirely of Teflon on the reduced outer diameter end portion 52, and the sheet ring 50 ) Is provided with a solid driving sheet 53 which is a ring-shaped body separated from.

In addition, the seat spring 51 is configured to press in a straight line against the opening and closing ball (10) and at least one pair of O-rings (55, 56) in the outer diameter portion of the solid drive seat 53 and the seat ring 50, respectively And 57,58).

In addition, the outer ring portion of the seat ring 50 has a hydraulic operation ring groove 60 in an outer diameter groove shape to allow the seat ring 50 to be driven by the hydraulic pressure flowing into the working hydraulic inlet pipe line 70. It has a more piston configuration.

Although the hydraulic pressure flowing into the working hydraulic inlet pipe path 70 is not shown, the hydraulic pressure is applied to the hydraulic pump from the outside and the hydraulic pressure is applied by operating the opening / closing ball 10 to operate the hydraulic pressure or as a manual pump. The hydraulic application technique is a conventional configuration and is not permanent in the present invention.

The effect of this invention of the said structure is demonstrated.

When the opening / closing ball 10 rotates to block the fluid flow, the seat ring 50 is slightly advanced by the seat spring 51 and then the entire seat is operated by the hydraulic pressure introduced into the working hydraulic inlet pipe 70. The ring 50 is advanced toward the opening and closing ball 10 while overcoming the elasticity of the seat spring 51, and the solid driving seat 53 toward the connection surface side of the seat ring 50 is firmly interviewed with the opening and closing ball 10. It belongs.

In such a configuration, an undesirable rotation moment is not generated.

{Example 2}

In the present embodiment, the heavy sheet is changed to a penetration sheet while adopting the structure of FIG.

That is, the seat ring 50 is configured to perform a linear operation, and has a seat spring 51 for applying an applied pressure to the seat ring 50,

The reduced outer diameter end portion 52 of the seat ring 50 is formed by separating the drive ring holder 81 of metal material and opening and closing the press-fit sheet 80 fitted into the ring groove 82 of the drive ring holder 81. By inserting the ball 10 from the connection surface side, the desired airtightness can also be realized.

The configuration of the other seat spring 51 and one or more pair of O-rings (55, 56, 57, 58), the hydraulic operation ring groove 60 and the working hydraulic inlet pipe 70 of the outer diameter of the seat ring 50 same.

{Example 3}

In the present embodiment, but having a two-stage ring similar to the conventional configuration, a pair of seat springs (91, 92) are provided in the upper and lower rear of the seat ring 90 to suppress the occurrence of the rotation moment The hydraulic pressurization method by the structure of the hydraulic actuating ring groove 60 and the hydraulic-hydraulic introduction pipe line 70 is used as it is.

Therefore, the configuration of the pair of O-rings 55, 56, 57, 58, the hydraulically actuated ring groove 60 of the outer diameter of the seat ring 90, and the hydraulic oil inlet conduit 70 is the same.

The seat ring 90 is divided into a ring body portion 95 separated from a two-stage forming body or a lower end portion, and a driving seat portion 96 having a roughly “a” shape, and extended to the reduced contraction outer diameter portion 97 of the ring body portion 95. The driving seat 96 is inserted into each other and is operated separately by sliding.

On the connection surface side of the opening / closing ball 10 of the drive seat part 96, the press-fit sheet 100 of abrasion-resistant material, such as Teflon, is also inserted in ring shape.

In such a configuration, the hydraulic spring introduced into the working hydraulic inlet pipe 70 acts on the hydraulic operating ring groove 60 while the seat springs 91 and 92 apply pressing force evenly in the vertical direction, thereby opening and closing the ball 10. To increase pressure and air tightness.

{Example 4}

Another configuration embodiment of the present invention is shown in FIG.

In this configuration, also constitutes a seat ring 200 for performing a linear operation,

The seat ring 200 is formed in a multi-stage structure of a substantially stepped shape, and is inserted through the O-rings 251, 252, 253, 254 while elastically inserting the seat spring 201 pressurized from the upper rear portion into the spring hole 202. ,

Hydraulic application is performed by the configuration of the hydraulic operation ring groove 60 and the hydraulic pressure inlet pipe (70).

In addition, the sheet 210 in the seat cylinder 220 inside the seat cylinder 220 with the seat cylinder 220 as a perforation part so that the sheet 210 of the Teflon or resin body is inserted into the front side of the seat ring 200 to allow slide movement. Is inserted through the O-rings 211 and 212 like a piston and the pressure driving the seat 210 which is a piston member is the hydraulic pressure introduced through the hydraulic operating ring groove 60 and the hydraulic hydraulic inlet pipe 70 is induced The working hydraulic pipe line 230 is configured to be hydraulically connected at the center side of the seat ring 200,

The hydraulic hydraulic pressure line 230 is elastically applied to the seat 210 which is a piston through the operation O-ring 240 at the rear of the seat 210, so that the seat 210 and the seat ring 200 are separately. It works.

As the configuration of the present embodiment described above, the hydraulic pressure is introduced through the moving hydraulic operating ring groove 60 and the working hydraulic inlet pipe line 70 and is hydraulically connected at the center side of the seat ring 200 through the working hydraulic pipe line 230. At the rear of the seat 210, the operation O-ring 240 elastically pushes the seat 210 back to the opening / closing ball 10 side.

Therefore, the seat ring 200 is initially pressed by the seat spring 201 to the opening and closing ball 10 side, and when the hydraulic pressure is activated, the seat 210 is elastically advanced to press the opening and closing ball 10 by By having a sealing structure, the smooth sealing operation becomes possible as a multistage operation.

The airtight seat assembly, such as the ball valve of the present invention having various configurations as described above, minimizes abrasion between members due to repeated operation of the opening and closing ball and improves airtightness by improving the conventional airtight configuration. Increasingly, it is useful to be able to construct a large-capacity ball valve.

Claims (4)

A spherical opening / closing ball 10 accommodated in the ball valve body 1 and having a fluid through hole 2 therein is interposed between the lower bearing portion 3 and the upper opening stem 4. In a seat assembly for airtightness, such as a ball valve, which is configured to be rotatable in the ball valve body (1), and a pair of caps (5) on both sides of the ball valve body (1) accommodate the seat ring and bolted thereto; The seat ring 50 of the ring-shaped body to drive in a straight line, The solid driving seat 53 of the wear-resistant material slidingly driving on the reduced outer diameter end portion 52 of the seat ring 50, The seat spring 51 for pressing the opening and closing ball 10 in a straight line against the connection surface, At least one pair of O-rings 55, 56, 57, 58 on the outer diameter portion of the solid driving seat 53 and the seat ring 50, Hydraulic operating ring groove 60, which is a hydraulic operation space of the outer diameter groove shape between the seat ring 50 and the connection surface of the solid drive seat 53, By including a hydraulic hydraulic inlet pipe 70 in fluid communication with the hydraulic operation ring groove 60, the solid drive seat 53 is applied to the opening and closing ball 10 simultaneously or sequentially with elasticity and hydraulic pressure to increase airtightness. An airtight seat assembly, such as a ball valve, characterized in that. A spherical opening / closing ball 10 accommodated in the ball valve body 1 and having a fluid through hole 2 therein is interposed between the lower bearing portion 3 and the upper opening stem 4. In a seat assembly for airtightness, such as a ball valve, which is configured to be rotatable in the ball valve body (1), and a pair of caps (5) on both sides of the ball valve body (1) accommodate the seat ring and bolted thereto; The seat ring 50 of the ring-shaped body to drive in a straight line, A driving ring holder 81 of a metal material inserted into the reduced outer diameter end portion 52 of the seat ring 50 to be driven in a separate manner; The press-fit sheet 80 is inserted into the ring groove 82 of the driving ring holder 81 and inserted from the connection surface side of the opening and closing ball 10, The seat spring 51 for pressing the opening and closing ball 10 in a straight line against the connection surface, At least one pair of O-rings 55, 56, 57, 58 on outer diameter portions of the press-fit sheet 80 and the seat ring 50, The seat ring 50 of the ring-shaped body driven in the straight line, Hydraulic operating ring groove 60, which is a hydraulic operating space of the outer diameter groove formed on the connection surface of the seat ring 50 and the drive ring holder 81, By including the hydraulic hydraulic inlet pipe (70) in fluid communication with the hydraulic operation ring groove (60) is applied to the opening and closing ball 10, the press-fitting sheet 80 at the same time or sequentially and elasticity to increase the airtight An airtight seat assembly, such as a ball valve, characterized in that. A spherical opening / closing ball 10 accommodated in the ball valve body 1 and having a fluid through hole 2 therein is interposed between the lower bearing portion 3 and the upper opening stem 4. In a seat assembly for airtightness, such as a ball valve, which is configured to be rotatable in the ball valve body (1), and a pair of caps (5) on both sides of the ball valve body (1) accommodate the seat ring and bolted thereto; The driving seat is divided into a ring body portion 95 separated from the lower end portion and a driving seat portion 96 having a roughly "a" shape and extended to the reduced outer diameter portion 97 of the ring body portion 95. The seat ring 90 is inserted into the unit 96, the sliding ring, A pair of upper and lower seat springs 91 and 92 accommodated and fixed to the rear of the ring body portion 95 and the driving seat portion 96 of the seat ring 90, Ring-shaped press-fit sheet 100 of the wear-resistant material is fixed to the connection surface side of the opening and closing ball 10 of the seat ring 90, One or more pairs of O-rings 55, 56, 57, 58 on the outer diameter portion of the heavy sheet 53 and the seat ring 50, Hydraulic operating ring groove 60, which is an hydraulic operating space of the outer diameter groove formed on the connection surface of the ring body 95 and the driving seat 96, By including the hydraulic hydraulic inlet pipe (70) in fluid communication with the hydraulic operation ring groove (60) to the pressurized seat 100 is applied to the opening and closing ball 10 at the same time or elastically and hydraulically to increase the airtightness An airtight seat assembly, such as a ball valve, characterized in that. A spherical opening / closing ball 10 accommodated in the ball valve body 1 and having a fluid through hole 2 therein is interposed between the lower bearing portion 3 and the upper opening stem 4. In a seat assembly for airtightness, such as a ball valve, which is configured to be rotatable in the ball valve body (1), and a pair of caps (5) on both sides of the ball valve body (1) accommodate the seat ring and bolted thereto; The seat ring 200 is a multi-stage multi-stage unitary shape is inserted into the spring hole 202 to press the seat spring 201 to pressurize in the spring hole 202 and is kept airtight by O-rings (251, 252, 253, 254), The seat 210 of the seat ring 200 in the inside of the seat cylinder 220 is provided with a seat cylinder 220 as a perforation part to insert the wear-resistant sheet 210 into the front side of the seat ring 200 to allow the slide movement. Is inserted like a piston through the O-rings (211,212) of the The seat ring 200 has a working hydraulic pipe line 230 to which hydraulic pressure from the outside is applied as a perforation part, and an operating O ring 240 made of an elastic material between the working hydraulic pipe line 230 and the rear of the seat 210. Airtight seat assembly, such as a ball valve, characterized in that it further has a).