RU2486394C2 - Bellow ball valve with upper connector - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: bellow ball valve with an upper connector includes a body connected to a top cover plate, to inlet and outlet branch pipes, and a ball plug installed on the shaft through spring-loaded seats with contact surface in the form of a ball belt. A damper is installed between the ball plug at the bottom and the shaft. At the top, between the plug and the stock there installed is a converter of back-and-forth movement to rotational movement without any displacement of force transfer axs. The converter consists of a separator with at least two slots structurally made at a certain angle for installation of rolling bodies (balls) and external framework. The latter has a collar fixed between support roller bearings. Inside the separator there arranged is a stock having a base, on which there made are slots similar to slots of the separator for arrangement of rolling bodies (balls). A collar is made on the stock. One end of the bellow assembly is welded to that collar. The other end of the bellow assembly is attached to the cover plate by means of a lens through a stressed multilayered toroid-shaped sealing element.

EFFECT: providing the possibility of using the above valve for operation with corrosive and radioactive working media characterised with high parameters; improving reliability and durability of power plants without constant maintenance of valves.

4 cl, 3 dwg

Description

The invention relates to pipe fittings designed to block flows and characterized by high parameters with aggressive and radioactive fluids - temperature up to 560 ° C, pressure up to 40 MPa.

One of the requirements for pipeline valves is leak tightness over the entire life cycle.

Known ball valve with upper connector (RU 2108512 C1, class F16K 5/20, 04/10/1998). The specified design contains a housing with an upper flange, inlet and outlet nozzles, a ball plug located on solid saddles, constantly loaded with springs towards the ball plug. In the surfaces of the seats contacting the ball plug, elastomeric seals are rolled, and o-rings are placed between the surface of the seat and the body.

A disadvantage of the known ball valve with an upper connector is the presence of wearing elastomeric seals in the contact surface of the seat with a ball plug, which reduces the reliability of the valve as it is used. In addition, due to the use of elastomeric seals in the design of ball valves, restrictions arise during their operation at energy facilities at elevated temperatures and pressures.

Also known is the design of a ball valve designed to be installed on pipelines as an overlapping device that does not require cutting it out of the pipeline during repair - a ball valve with an upper connector, comprising a body connected by threaded connections to the upper flange, an inlet and an outlet pipe, and a ball plug, mounted on spring-loaded seats, with contact surfaces in the form of a ball belt (RU 45494 U1, class F16K 5/20, 05/10/2005). The spring-loaded seats are equipped with seals of elastomeric material located in the zone of contact surfaces in the form of ball belts in contact with the surface of the ball plug and installed in additional ring bushings, on the end surface of which from the side of the ball plug is made an annular conical section and an annular collar at the end of the section, and on the inner surfaces of the upper flange and the lower part of the housing, in place of their contact with the annular conical sections of the additional annular bushings, the reciprocal e they conical surface, the additional annular sleeve sealed on the end face against the housing of the ball valve elastomeric rings, and spring-loaded seat sealed against the inner surface of ring clamps.

A disadvantage of the known ball valve is the limited range of technological parameters of the working medium for which it is used to shut off the flow. In particular, the presence of seals of elastic material between the ball plug and seats, between the seat and the ring sleeve and between the ring sleeve and the housing does not allow the use of a ball valve at pressures and temperatures of the working fluids used in power plants. The implementation of the mechanism for attaching spring-loaded seats with contact conical surfaces on the additional sleeve and the surfaces of the upper flange and the annular grooves of the housing corresponding to them requires design forces on the threaded connection of the upper flange and the housing, since if they are exceeded, the pressure of the spring-loaded saddle against the surface of the ball plug may be weakened and if the threaded connections of the upper flange and the housing are not tight enough, the tightness of the entire valve is violated due to insufficient load seals between the additional ring sleeve and the housing, the additional ring sleeve and the seat. Under operating conditions, it is difficult to provide design loads on threaded connections between the body and the upper flange, for example, after repair during assembly of the crane, which reduces the reliability of the crane.

The closest in purpose, technical nature and the achieved result to the claimed ball valve is a ball valve with an upper connector (RU 2396474 C1, class F16K 5/20, 08/10/2010). A ball valve with an upper connector comprises a housing with a top flange connected to it by threaded connections, an inlet and an outlet nozzle, and a ball plug. The cork is mounted on spring-loaded seats with contact surfaces in the form of a ball belt. Spring-loaded seats are installed in additional bushings equipped with ring collars. These bushings are sealed on the end surface relative to the body of the ball valve. The contact surfaces of the said saddles are made of at least double-contour along the width of the ball girdle. The contours on the surface of the ball zone are separated by at least one annular groove. Additional annular sleeves are mounted coaxially with the saddles and are mounted on the latter along the threaded surface with the possibility of transmitting a pressing force to the said seals. In the saddle, in the area of the threaded contact surface of the additional sleeve and the saddle, at least one through channel is made connecting to the annular groove. Seals between the end surface of the additional ring bushings and the housing are made of stuffing box.

A disadvantage of the well-known ball valve with an upper connector is the presence of an stuffing box seal that wears out during operation and requires constant maintenance (pulling up or replacing packing, or o-rings), which is unacceptable when working on aggressive and radioactive environments.

The disadvantage of all known ball valves is the lack of a device for depressurizing beyond the calculated one during heating with a closed valve from the cavity formed between the cover and around the ball plug in order to maintain the tightness of ball valves with the upper connector relative to the external environment.

The technical problem solved by the invention is the use of a bellows assembly instead of stuffing box packing and the translation of the translational motion of the rod into rotational motion of the ball plug, since the flow of the working medium is blocked by turning the ball plug 90 degrees.

The task is achieved in that the ball valve with an upper connector contains a housing with an upper connector, with a groove for installing a strained multilayer toroidal sealing element, a cover closing the connector, with inlet and outlet nozzles and a ball plug mounted according to the invention on a spring-loaded support, the supply of the working medium to the ball valve is possible in both directions, given the fact that the bellows seal can only work reciprocatingly, and shutting off the flow of the working medium is carried out by rotating the ball plug at an angle of 90 degrees, then according to the invention, a converter of reciprocating motion into rotational without a shift of the axis of transmission of force is used. The converter consists of a separator with at least two grooves made structurally at a certain angle for installing rolling elements (balls) and an outer cage. The outer cage has a collar, which is mounted on thrust bearings, fixed in the lid with a nut. A rod having a heel is placed inside the separator, on which grooves are made, similar to the grooves of the separator for accommodating rolling elements (balls). A collar is made on the rod, to which a bellows assembly is welded at one end, the second end of which is fixed to the cover by means of a lens through a strained multilayer toroidal sealing element. The cover, through a strained multilayer toroidal sealing element, closes and seals the main connector of the ball valve with threaded elements, forming a sealed closed loop. The rod makes a reciprocating movement, transfers the force to the rolling elements, which, in turn, rotate, transmit the force to the separator, which converts the movement into rotational.

In order to ensure pressure relief when the valve is closed, from the cavity formed between the cap and around the ball plug when the pressure rises during heating above the calculated one and in order to maintain the tightness of the ball bellows valve with the upper connector relative to the external environment, according to the invention, a relief valve is provided having a channel connecting cavity of the crane with an internal cavity of the nozzle. The channel has a socket for installing a spring, a saddle and a ball and a threaded hole. A fitting having a central hole is screwed into the threaded hole, which is overlapped by a ball pressed by a spring. When the ball valve is heated in the closed position when there is a working medium in the cavity at a pressure higher than the design pressure, the ball moves under pressure, opening a channel through which pressure is released into the internal cavity of the nozzle zone. When the pressure reaches the calculated value, the ball is pressed by the spring to the fitting and closes the channel.

An example of the proposed ball valve is presented in the drawings.

Figure 1 shows the design of the proposed ball ball valve with the upper connector in the context.

Figure 2 shows the leader A, which shows the Converter reciprocating motion into rotational without changing the axis of the direction of movement.

Figure 3 shows the leader B, which shows the pressure relief valve from the inner cavity of the ball valve bellows with the upper connector.

The bellows ball valve with the upper connector contains a housing 1 with inlet 2 and outlet 3 nozzles, in the mounting socket In which are mounted spring-loaded seats 4 in contact with the ball plug 5. The ball plug 5, through the sleeve 6, rests on a shaft 7 installed in the sleeve 8, which fixed in the housing 1. Between the shaft 7 and the clutch 8, a Belleville spring 9 (damper) is installed eliminating the possibility of "burning" of the shaft 7. The nozzles 2 and 3 and the central hole G in the ball plug 5 form the passage channel of the ball bellows valve. The housing 1 has two channels And (Fig. 3) connecting the cavity Ж (Fig. 1) with the internal cavities D and E of the nozzles 2 and 3. In the channels And (Fig. 3), a socket K, in which the spring 10 is installed, is made, a spring 10 is inserted into the seat 11 and the ball 12. A fitting 13 is screwed into the threaded hole L (FIG. 3), having a central hole M that overlaps the ball 12 pressed by the spring 10. A reciprocating to rotary transducer is located between the ball plug 5 and the stem 14 without displacement of the axis of the transmission of effort, consisting of a separator 15 (Figure 2) with grooves 16, selected structurally for installing rolling elements 17 (balls), an outer race 18 having a collar 19, which is mounted on thrust bearings 20 and 21, which, in turn, are fixed in the cover 22 with a nut 23. Inside the separator 15, a heel 24 of the rod 14 is placed , at the heel 24, at least two grooves are made, similar to the grooves of the separator for accommodating the rolling bodies (balls) 17. A shoulder 25 is made on the rod 14, to which the bellows assembly 26 is welded at one end, the second end of the bellows assembly 26 through a strained multilayer toroidal sealing ale The entente 27 is fixed by means of the lens 28 to the cap 22. The cap 22, through the strained multilayer toroidal sealing element 29, by means of the threaded elements 30 closes and seals the main connector 31 of the ball valve with the upper connector.

The rod makes a reciprocating movement transmitted by the fifth with the grooves to the rolling bodies located inside the grooves, which, in turn, rotate, transmit the force to the separator, converting the movement into rotational.

The flow of the medium into the ball valve is possible in both directions. Overlapping the flow of the working medium by turning the ball plug at an angle of 90 degrees.

The invention provides the possibility of using ball-type bellows valves with an upper connector for working with aggressive and radioactive fluids characterized by high parameters - temperature up to 560 ° C, pressure up to 40 MPa, as well as improving the reliability and durability of power plants without constant valve maintenance.

Claims (4)

1. Ball valve bellows with an upper connector, comprising a housing connected to the top cover, with inlet and outlet nozzles, and a ball plug mounted on the shaft through spring-loaded seats with contact surfaces in the form of a ball belt, while the spring-loaded seats are installed in additional provided with ring collars ring bushings, which are sealed on the end surface relative to the ball valve housing, characterized in that a damper is installed between the ball plug at the bottom and the shaft, and between the plug and the rod at the top m, a reciprocating-to-rotational transducer is installed without shifting the axis of the force transmission, consisting of a separator with at least two grooves structurally made at a certain angle to install rolling bodies (balls) and an outer cage that has a collar fixed between the supporting rolling bearings, while inside the separator there is a rod having a heel with grooves similar to the grooves of the separator for accommodating rolling bodies (balls), on which a shoulder is made with welded welding at one end with lfonnym node, and a second end fixed to the lid by a lens through a voltage multilayer torus-shaped sealing member. 2. The ball valve bellows with the upper connector according to claim 1, characterized in that a damper is installed between the ball plug and the shaft, eliminating the "sticking" of the shaft located in aggressive environments and environments with high parameters. 3. Ball valve bellows with an upper connector according to claim 1, characterized in that the housing is connected to the upper flange by means of a strained multilayer toroidal sealing element. 4. Ball valve bellows with the upper connector of claim 1, characterized in that there is a relief valve to provide pressure relief from the cavity formed between the cover and around the ball plug, with an increase in pressure above the design in order to maintain the tightness of the ball valve with the upper connector relative the external environment.

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