RU2520729C2 - Axisymmetric regulating valve with upper flange connector - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to pipeline fittings, in particular, to axisymmetric regulating valves with upper flange connector and is intended for regulating and blocking of liquid and gaseous working media at power engineering and gas and oil chemistry facilities. An axisymmetric regulating valve with upper flange connector comprises a casing with inlet and outlet branch pipes and a fairing set inside the casing. A compensated cylindrical rolling gate is installed in the fairing cavity movably along the valve axis by a driven rack-and-gear mechanism. The casing is fitted by the upper flange connector with grooving where a sealing element is set to seal-in the connector: casing-cover. The rolling gate comprises a cavity with upper, lower and inner surfaces being at the same time the guides and the support of a separator. The rolling gate is sealed in the fairing by sealing elements. A sealed-in closed loop with a sealing control channel is arranged between the casing and the cover. A sealing control channel for the rack-and-gear mechanism is provided as well. The sealing control channels are closed by plugs fitted by threads identical to the grease nipples.

EFFECT: increased reliability of valve performance and reduced expenses for maintenance and repair in the course of operation.

2 cl, 4 dwg

Description

The invention relates to pipe fittings, in particular to axisymmetric control valves with an upper flange connector, for power and gas and petrochemical facilities, designed to control and shut off liquid and gaseous working media.

One of the requirements for pipeline valves is leak tightness over the entire service life and maintainability without cutting from the pipeline.

Known regulating valve with axial flow, comprising a housing and an inner fairing housing forming an annular passage channel connected to the inlet and outlet nozzles, and a rack-and-pinion mechanism for moving a locking element made in the form of a piston located inside the sleeve with holes located in the inner housing, with the possibility in one mode of communication of the cavity of the inlet pipe with the cavity of the output pipe, and in another position - overlapping the said holes of the sleeve, which is installed in the housing and exit The main branch pipe and is preloaded by the mounting element - the saddle, with the possibility of dismantling the latter, while the driven rod, with the piston installed with the possibility of dismantling, is connected to the leading rod of the rack-and-pinion mechanism and is located, by means of seals, in the guide sleeve made of bronze having the free side of the drive rod is a lubricated cavity. (RF patent No. 77007 for utility model “Control valve” according to Cl. F16K 3/14, published on 10/10/2008). To reduce the load on the drive and prevent the processes of erosive wear of parts, the piston and sleeve can be made of aluminum, with hardening of the working surfaces by plasma electrolytic oxidation, or from titanium alloys, or from steel.

A disadvantage of the known valve design is the effect of cavitation processes in the turbulent flow of the transported fluid on the surface of the parts in the outlet channel, causing wear on the surface of the valve parts and the pipeline connected to it and requiring hardening of their surfaces or execution of especially durable materials, which significantly increases the cost of the valve and pipeline.

A disadvantage of the known valve is also the inability to perform maintenance and repair of internals without cutting from the pipeline.

Known axial flow control valve comprising a housing with inlet and outlet nozzles and located inside the housing with the formation of an annular channel, a cowl, in the output of which there is a cylindrical piston mounted on a driven rod of the rack mechanism, the leading rod of which is connected to the drive (RF Patent No. 84,938 for the utility model “Axial Flow Control Valve” according to CL F16K 39/04, published July 20, 2009). A valve seat is fixed in the outlet pipe of the valve, with which the cylindrical piston contacts, moving to its final position when the outlet channel is blocked, in which a perforated annular sleeve is installed. The cylindrical piston is made unloaded by means of channels parallel to the axis made in it and connecting the internal cavity of the piston with the cavity of the outlet pipe.

The disadvantage of the valve, when used to control the flow rate parameters of the working fluid flow of an energy facility, is to increase the hydraulic resistance of the controlled flow of the working fluid at transient moments (at the moments of opening and closing of the valve), which is caused by the appearance of additional turbulent disturbances in the flow, leading to the appearance of a surge effect . In valve operating conditions, when controlling the flow parameters of liquid working media with high pressure and temperature, excessive flow turbulence leads to cavitation processes on the surface of the piston, seat, and pipeline, which unpredictably affects the control process and causes erosive wear of their surfaces.

A disadvantage of the known valve is also the inability to perform maintenance and repair of internals without cutting from the pipeline.

Closest to the claimed invention for the purpose, the achieved result and the technical essence is a control valve with axial flow for energy facilities (Patent RU 2455543 C2). The valve comprises a cylindrical body with inlet and outlet nozzles, a cowl-mounted inner cowl mounted on the cover of the upper connector by means of a pylon, in the cavity of which there is a rack-and-pinion mechanism associated with the axial movement mechanism of the unloaded piston in contact with the seat mounted in the outlet nozzle. The saddle is made with a guide annular protrusion in the zone of contact with the piston made with a concave end surface, the periphery of which is formed by the contact surface of the guide annular projection of the saddle, the guide annular protrusion of the saddle is made with a diffuser section, and the saddle is equipped with a flow divider mounted on the outer end surface of the saddle and made in the form of a perforated plate, the holes on which are made with a variable perforation pitch.

A disadvantage of the known valve is the inability to control the tightness of plug connections during valve assembly or to eliminate leakage through plug connections during operation, which is very important for gas and petrochemicals.

The disadvantages of the known designs (RF Patent No. 77007 for utility model “Control valve” according to Cl. F16K 3/14, published 10/10/2008), (RF Patent No. 84938 for utility model “Control valve of axial flow” according to Cl. F16K 39/04 , published on July 20, 2009) is a possible clogging with scale, pollution and clogging of the separator holes, over which the working medium is constantly located.

The technical result when using the inventive as an invention control valve axisymmetric with an upper flange connector for pipe fittings is the ability to: work with liquid and gaseous media, provide constant control of the tightness of detachable valve joints and information about the position of the shut-off member, eliminate leaks in detachable joints by supplying into a sealed closed circuit of sealing lubricant, eliminating clogging of the separator holes, ensuring repair of clarity without cutting out piping, there is no need for maintenance turnaround time, improve the reliability, safety and durability of the valve regulating axisymmetric with the upper connector flange during its entire life.

To achieve the specified technical result in the control valve axisymmetric with an upper flange connector for working with liquid and gaseous media, containing a housing with inlet and outlet nozzles, placed inside the housing with the formation of an annular axisymmetric channel fairing, in the cavity of which is movable along the valve axis, by means of a drive gear rack mechanism, an unloaded cylindrical shutter is installed. Moreover, according to the invention, the housing has an upper flange connector with a groove in which a sealing element is installed for sealing the housing-cover connector, and the shutter contains a cavity with upper, lower and inner surfaces, which are simultaneously guides and the support of the separator, and are sealed in the fairing by sealing elements , when moving inward, the fairing opens the separator openings, providing a continuous linear or equal percentage increase in the passage area, and protects the separator openings ora from a possible blockage. Between the housing and the lid there is a sealed closed circuit formed due to the fact that the housing with the lid is sealed with a sealing element on one side, and on the other hand, in the lid on a cylindrical surface in contact with the housing, an annular groove is made and at least one channel connecting an annular groove with a vertical channel for tightness control, below which a groove is made in the cover or in the housing for installing the o-ring. To control the tightness of the closed loop of the rack-and-pinion mechanism, at least one tightness control channel and a threaded hole are made in the lid. The channels for tightness control are closed with plugs having threads similar to those of a grease fitting.

The claimed control valve axisymmetric with the upper flange connector is illustrated by drawings and drawing.

Figure 1 shows a General view of the control valve axisymmetric with the upper flange connector in the closed state.

Figure 2 presents a diagram of the control of tightness on the rod (remote element A of Figure 2);

Figure 3 presents the control circuit of the tightness of the flange connector (remote element B Figure 3)

Figure 4 presents a sketch of the shutter, a view along the axis of the valve (remote element In Figure 4).

The axisymmetric control valve with upper flange connector contains a housing 1 with input 2 and output 3 nozzles and mounted on the cover 4 by means of a pylon 5 to form an annular axisymmetric channel G fairing 6, in the cavity of which is movable along the axis of the valve, by means of gear-rack mechanism 7, is installed unloaded cylindrical shutter 8. The discharge of the shutter 8 is carried out by means of channels D connecting the volume of the inner cavity E of the shutter with a cavity W formed on the end surface 9 of the shutter 8. The shutter OR 8 (4) comprises an inner cavity 3, and the top and bottom to the surface. When moving the shutter 8 opens the holes 10 of the separator 11 in the seat 12. The seat 12 is screwed into the outlet pipe 3 of the housing 1 by means of a thread L, sealed by a sleeve 13 and fixed in the housing 1 from spontaneous unscrewing. The seal of the shutter 8 in the cavity E of the fairing 6 is carried out by means of sealing elements 14. Between the housing 1 and the cover 4 there is a sealed closed circuit M (Figure 3), formed due to the fact that the cover 4 with the housing 1 is sealed by a sealing element 15 on one side, and on the other hand, in the lid 4 on the cylindrical surface 16 in contact with the housing, an annular groove 17 is made and at least one channel 18 is made connecting the annular groove 17 with a vertical channel for tightness control 19. Below the annular groove 17 c A groove 20 for installing the sealing ring 21 is made in the arm 4 or in the housing 1. In the cover 4 there is a channel 22 (FIG. 2) for installing the rod 23, between the seal 24 of the rod 23 and the seals 25, 26, 27, 28 of the rack-and-pinion mechanism 7 a tight closed loop 29 is formed. In the lid 4, leak tightness control channels 30 (FIG. 2) and threaded holes 31 are made. Leak tightness control channels 19 and 30 are closed with plugs 32 having threads similar to the grease fittings 33.

The valve is opened by moving (turning) the stem 23 by a valve actuator (not shown) by means of a rack-and-pinion mechanism 7, while the shutter 8 moves into the cavity E of the fairing 6. The contact surfaces H of the shutter 8 and P of the seat 12 open, the working medium enters the holes 10 of the separator 11, opened by moving the shutter 8, and enters in the form of directed jets of flow in the cavity P formed by the concave end surface 9 of the shutter 8. The working medium enters the inner cavity E of the fairing 6, aligning the pressure in the cavities F and G and the unloading valve 8. The flow of working fluid in the cavity P turns concave end surface 9 of the shutter 8, is sent to the outlet 3 and the output of the valve into a pipeline (not shown).

When the shutter 8 is installed in the extreme left position in the cavity E of the fairing 6, the valve opens completely. The valve is closed in the reverse order - when the shutter 8 is moved by a rack-and-pinion mechanism 7 from the cavity E to the side of the seat 12.

The assembled valve before applying pressure can be checked for leaks on the flange connector 4 by applying pressure to the vertical channel for tightness control 19, as well as for leaks in the contour of the rack-and-pinion mechanism 7 by applying pressure to the tightness control channel 30. During operation, by installing in channels 19 and 30 tightness sensors, it is possible to monitor the condition of the valve plug-in connections or, having installed grease fittings, it is possible to apply sealing grease to ensure the tightness of the connector.

Using the inventive axial-symmetric control valve with an upper flange connector with hermetically sealed closed circuits of detachable connections will allow the valve to be used for working with liquid and gaseous media, maintain maintainability without cutting out of the pipeline, control the tightness of the flange connector, or eliminate leakage in detachable connections by feeding it into a tight closed sealing lubricant circuit, which significantly increases reliability and reduces maintenance costs and repair during operation.

Claims (2)

1. Axial-symmetric control valve with upper flange connector, comprising a housing with inlet and outlet nozzles, having an upper flange connector with a groove, with a sealing element installed therein to seal the housing-cover connector, screwed into the seat body, cover with a rigidly mounted cowl, inside which, by means of a gear-river mechanism, an unloaded cylindrical shutter is installed, characterized in that the shutter comprises a cavity with lower, upper and inner surfaces, which are simultaneously guides and the support of the separator, sealed in the fairing by the sealing elements, when moving inside the fairing, opens the separator holes, providing a continuous linear or equal percentage increase in the passage area, and protects the separator holes from possible clogging, and there is a sealed closed circuit between the body and the cover, formed by the fact that the housing with the cover is sealed with a sealing element on one side and on the other hand in the cover on a cylindrical surface, activating with the housing, an annular groove is made and at least one channel is made connecting the annular groove with a vertical tightness control channel, below which a groove for installing the sealing ring is made in the lid or in the housing, there is also a sealed closed contour of the rack-and-pinion mechanism with a channel in the lid tightness control formed between the upper and inner sealing elements of the rack-and-pinion mechanism, while the tightness control channels are closed with plugs having analogues clean with grease fittings. 2. The axisymmetric control valve with the upper flange connector according to claim 1, characterized in that the seat separator is located inside the valve.

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