RU181165U1 - Control valve - Google Patents

Abstract

The utility model relates to pipe fittings, in particular to control valves, designed to control the flow rate of the working medium in the discharge pipelines. The control valve comprises a housing (1) with inlet (2) and output (3) nozzles and a seat (8) located inside the housing. The saddle (8) interacts with the separator (6) with radial holes (7) made on its lateral surface for the passage of the working medium. Inside the separator (6) is placed with the possibility of axial movement of the piston (10) with holes (12) at its end. The piston (10) is connected to the rod (14). A stuffing box is placed on the housing for sealing the stem (14). The stuffing box includes a sleeve (19) with a bearing (20) made of composite material with a low coefficient of friction installed in it. The sleeve (19) is placed above the stationary sealing element (18) and interacts with the nut (21) installed above it. A wiper (22) is located in the nut (21). The fixed sealing element (18) is made of polytetrafluoroethylene with additives including fiberglass and molybdenum disulfide. It provides increased reliability of the control valve at high pressures by reducing the load on the actuator. 2 ill.

Description

The utility model relates to pipeline valves, in particular to control valves, designed to control the flow rate of the working medium in the discharge pipelines and can be used on high-pressure gas and oil pipelines.

Known shut-off valve main, comprising a housing with connecting flanges in the form of nozzles made in one piece with the housing and forming the inlet and outlet openings, with a central vertically located cylindrical bore and a locking element coaxially located in it, a seat, an external seal of the mounting surface of the main locking body formed in the form of a lip seal embedded in an annular rectangular groove, while the lip seal is made in the form of a lip seal placed in a groove with nary tightness elastic rubber annular ring and the cuff-shell polymer of antifriction material (Patent RU №2355934 C2, IPC F16K 39/02, F16K 27/02, on 25.04.2007, publ. 20.05.2009).

The disadvantage of this design is the complexity of the design, the absence of an element ensuring the alignment of the stem relative to the seals and a large number of seals, which reduces the reliability of the valve, especially at high pressures.

The closest in purpose, technical essence and achieved result to the control valve declared as a utility model is a control valve comprising a housing with inlet and outlet nozzles and a seat located inside the housing, connected to an element in the form of a separator with radial openings made on its side surface for the passage of the working medium, and located inside the separator with the possibility of axial movement of the shutter in the form of a piston with holes at its end connected to the rod, grease Ikov assembly disposed on the housing for sealing a rod, comprising a nut, fixed sealing element (Patent RU №2259508 C2, IPC F16K 39/04, F16K 47/02, on 03.06.2003, published 27.08.2005 -. prototype).

A disadvantage of the known valve is the design complexity of the stuffing box, which includes the stuffing box, as well as the absence of an element ensuring alignment of the stem with the stuffing box, which in turn leads to uneven load distribution in the stuffing box and, over time, will lead to loss of tightness of the stuffing box and the valve as a whole. In the absence of alignment of the stem and the gland, the upper pressing element of the gland can come into contact with the rod, in this case, due to the coefficient of friction, the drive force, which is necessary to move the rod, increases. All of these factors reduce valve reliability.

The technical problem to which the utility model is directed is to increase the reliability of the control valve at high pressures by reducing the load on the drive.

To solve a technical problem, in a control valve containing a housing with inlet and outlet nozzles and a saddle located inside the housing, interacting with the separator with radial openings on its side surface for the passage of the working medium, and a piston with openings placed inside the separator with the possibility of axial movement its end, connected to the rod, a stuffing box located on the housing for sealing the rod, including a nut, a stationary sealing element, according to a utility model , the stuffing box is additionally equipped with a sleeve with a bearing made of a composite material with a low coefficient of friction placed above a stationary sealing element and interacting with a nut installed above it with a wiper located in it, while the stationary sealing element is made of polytetrafluoroethylene with additives including fiberglass and molybdenum disulfide.

The inclusion of a sleeve in the stuffing box stem with a bearing made of a composite material with a low coefficient of friction ensures sealing of the valve cavity, as well as centering of the stem, prevents metal-metal contact between the stem and the stuffing box bushing, which increases the reliability of the valve.

The use of a bearing with a low coefficient of friction of the bearing reduces the load perceived by the actuator when moving the valve shutter. Also, due to the centering property of the stuffing box bearing, the load on the stationary seal of the stuffing box is reduced, which results in less wear on the packing. In turn, the reduced load on the seal and the low coefficient of friction of the bearing reduce the force on the drive when moving the valve stem, which helps to increase the reliability of the valve

The stuffing box unit takes up less loads, in connection with which there is less wear on the stationary sealing element, which increases the reliability and durability of its design.

The implementation of the stationary sealing element made of polytetrafluoroethylene with additives, including fiberglass and molybdenum disulfide, ensures the tightness of the inner space of the valve from the working medium under pressure, which increases the reliability of the valve at high pressures.

The utility model is illustrated by drawings, where:

in FIG. 1 - shows a General view of the control valve, a longitudinal section;

in FIG. 2 is a view A in FIG. 1, a stuffing box of a rod housed in a housing is shown.

When describing the control valve, the positions in the drawings indicate:

1 - case

2 - inlet pipe

3 - outlet pipe

4 - fairing inside the housing

5 - passage ring channel

6 - separator

7 - radial holes in the separator

8 - saddle

9 - clamping sleeve

10 - piston

11 - the cavity in the piston

12 - holes in the piston end

13 - drive

14 - stock

15 - helical gearing

16 - rail

17 - hole in the housing

18 - fixed sealing element

19 - sleeve

20 - bearing

21 - nut

22 - wiper

The control valve comprises a housing 1 with an inlet 2 and an outlet pipe 3 and a cowl 4 forming an annular passage channel 5. At the outlet of the annular channel 5, a separator 6 with radial holes 7 is mounted, fixed by a seat 8 and a pressure sleeve 9 in the outlet pipe 3 (Fig. one). A piston 10 is mounted inside the separator 6 with the possibility of axial movement. The cavity 11 of the piston 10 communicates with the outlet pipe 3 by means of holes 12 made on the end face of the piston 10. The mechanism for moving the piston 10 includes a drive 13 connected to a vertically mounted rod 14, interacting by helical gearing 15 with a horizontally mounted rail 16. The rod 14 is equipped with a sealing stuffing box installed in the hole 17 of the housing 1 (Fig. 2). The stuffing box includes a stationary sealing element 18, over which the sleeve 19 is mounted. In the sleeve 19, a bearing 20 made of a composite material with a low coefficient of friction is fixed. The sleeve 19 interacts with the nut 21 installed above it. A wiper 22 is located in the nut 21. The sealing stuffing box ensures alignment of the rod 14 and the holes 17 of the housing 1. The fixed sealing element 18 is made of polytetrafluoroethylene with additives. Glass fiber and molybdenum disulfide are used as additives.

The control valve operates as follows.

The adjustable medium enters the inlet pipe 2, passes into the annular channel 5, formed by the housing 1 and the fairing 4, and through the openings 7 of the separator 6 enters the output pipe 3. If necessary, reduce the volume of the controlled medium (when closing the valve), the piston 10, by means of a rail 16 and the stem 14 are biased, providing overlapping of the openings 7 of the separator 6. The volume of the passing controlled medium is determined by the number of openings 7 in the separator 6. When the openings 7 of the separator 6 are completely closed, the valve is closed.

The valve is opened by a actuator 13, which sets the movement of the rod 14, connected by helical gearing 15 to the rack 16, which moves the piston 10 in the opposite direction. The pressure of the working medium in the cavity 11 of the piston 10 is equal to the pressure in the outlet pipe 3 due to the presence of openings 12 in the end face of the piston 10 communicating these cavities. The piston 10 is completely unloaded.

The tightness of the rod 14 with respect to the external environment is ensured by the stationary sealing element 18 of the stuffing box installed in the hole 17 of the housing 1. The alignment of the rod 14 and the hole 17 of the housing 1 is provided by a bearing 20 made of composite material with a low coefficient of friction installed in the sleeve 19. The presence of the bearing 20 from the composite material with a low coefficient of friction in the stuffing box reduces the load on the stationary sealing element 18 in case of inaccurate holes 17 in the housing 1. Low The coefficient of friction of the composite bearing material helps to reduce the drive load. The purity of the stuffing box is ensured by the wiper 22 installed in the nut 21.

Thus, the use of the proposed technical solution ensures the reliability of the control valve at high pressures using low power drives, and also reduces the load on the drive, which increases the reliability and durability of the valve design.

Claims (1)

A control valve comprising a housing with inlet and outlet nozzles and a saddle located inside the housing, interacting with the separator with radial openings on its side surface for the passage of the working medium, and a piston with openings located at the end of the separator with axial movement on its end, connected to the rod , a stuffing box located on the housing for sealing the rod, including a nut, a stationary sealing element, characterized in that the stuffing box is additionally provided a sleeve with a bearing installed in it made of a composite material with a low coefficient of friction, placed above a stationary sealing element and interacting with a nut installed above it with a wiper located in it, while the stationary sealing element is made of polytetrafluoroethylene with additives including fiberglass and molybdenum disulfide.

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