RU2269052C2 - Check valve - Google Patents

Abstract

FIELD: valving.

SUBSTANCE: check valve comprises housing, inlet and outlet branch pipes, and baffle with the rod for valving member. The valving member is mounted in the housing for permitting movement along the rod. The housing has a chamber provided with conical surface on its inner diameter . Between the housing and outlet branch pipe is a baffle. The baffle is connected with the rod through the adjusting ring. The end of the rod is provided with the stabilizer with bearing surface and passages for flowing fluid. The stabilizer is mounted with a spaced relation to the conical surface of the chamber. The valving member is made of a flexible material and has surfaces that correspond to the conical surface of the chamber and bearing surface of the stabilizes for closing the passages for flowing fluid and ring space between the stabilizer and chamber.

EFFECT: enhanced reliability.

4 dwg

Description

The invention relates to the field of mining, in particular to the oil and gas extraction, oil and gas processing industry, and can be used in oilfield or gas pumping equipment transporting oil, gas, aggressive media, water, to protect pumping units or gas compressor in case of their planned or emergency stops.

Known check valves [2], [3] containing casing, locking elements, openings for the flow of liquid or gas.

The disadvantages of the known check valves are their unreliability during operation, especially at high pressures (210 MPa and above), and the wear of the internal surfaces to ensure their tightness.

A known non-return valve [1], comprising a housing, an inlet and outlet pipe, a baffle with a rod for a locking member located in the housing with the ability to move along the rod, and in the housing there is a chamber with a conical surface on its inner diameter.

The disadvantages of the known valve are unreliability during operation, especially due to hydroabrasive wear of surfaces that ensure valve tightness during operation at high pressures of 21/210 MPa (kgf / cm ² ) and higher.

The objective of the invention is to increase reliability, to increase the service life, especially in high pressure systems, in the convenience of servicing the check valve, maintainability and competitiveness.

The technical result is achieved in that the check valve, comprising a housing, inlet and outlet nozzles, a baffle with a rod for a locking member located in the housing with the ability to move along the rod, and in the housing there is a chamber with a conical surface on its inner diameter, characterized in that between the body and the outlet pipe there is a partition connected to the rod through an adjusting ring, at the end of the rod there is a stabilizer with a supporting surface and channels for fluid flow, while izator mounted with an annular gap relative to the conical surface of the chamber, and the locking member is made of an elastic material with surfaces corresponding to said conical surface of the chamber and the supporting surface stabilizer for overlapping channels for liquid flow and an annular clearance between the stabilizer and the camera.

Figure 1 shows the check valve in the open position.

Figure 2 shows the check valve in the closed position and with a design variant of the locking element.

Figure 3 is a view A of figure 1.

Figure 4 is a view of B in figure 1.

The check valve contains:

inlet pipe 1,

Pavilion 2,

camera 3, made in the housing 2,

a conical surface 4 made on the inner diameter of the chamber 3,

partition 5,

studs 6,

seals 7,

output pipe 8,

nuts 9,

union nut 10,

stock 11,

adjusting ring 12,

a locking element 13 made of an elastic material,

the conical surface 14 of the locking element 13,

the supporting surface 15 of the locking element 13,

the stabilizer 16, made at the end of the rod 11,

an annular gap 17 between the stabilizer 16 and the camera 3,

the supporting surface 18 of the stabilizer 16,

channels for the flow of fluid 19, made in the stabilizer 16.

In a static position, the elements of the check valve interact as follows.

On the rod 11 with the stabilizer 16 put on the locking element 13, made of elastic material, and the rod with the locking element through the adjusting ring 12 is strengthened in the partition 5 with a union nut 10 (figure 1).

A rod with a locking element and a partition is installed in the chamber 3 of the housing 2, and the housing assembled through seals 7 is installed between the output 8 and input 1 nozzles.

The check valve in assembled form is tightened with nuts 9 through the studs 6.

A non-return valve is installed (for example, it is welded into the pipeline in the discharge line in front of the pump unit or in front of the gas compressor).

In a dynamic position when starting the pumping unit or gas compressor from the influence of the pumped medium through the channels for fluid flow 19, made in the stabilizer 16, and the annular gap 17 between the stabilizer 16 and the chamber 3, the locking element 13 along the rod 11 moves to the partition 5.

The pumped medium through the channels 19 of the stabilizer 16 and the annular gap 17, around the locking element 13, through the chamber 3, through the channels in the partition 5 is pumped into the pipeline. The valve is open (figure 1, figure 3, figure 4).

In case of a planned or emergency shutdown of the pumping unit or gas injection compressor by the back pressure of the liquid or gas through the channels in the partition 5, the locking element 13 along the rod 11 is sent before the conical surfaces 14 of the locking element 13 and the conical surface 4 of the chamber 3 are combined, as well as the supporting surface 18 of the stabilizer 16 and the supporting surface 15 of the locking element 13, overlapping the annular gap 17 and the channels 19 in the stabilizer 16. The valve is closed (figure 2).

The presence in the design of the valve of the reverse set of adjusting rings 12 allows to use both the conical surface 4 of the chamber 3 made by the housing 2 and the supporting surface 18 of the stabilizer 16 to prevent the valve from being forced through the conical surface 4 through the conical surface 4 in the chamber 3, while ensuring valve tightness reverse during operation.

In Fig.2 the implementation of the locking element 13 is shown in two parts.

This allows you to increase the maintainability of the check valve and reduce costs when restoring the locking element, since when the front part is worn during repair, it can be replaced.

The proposed new technical solution of the non-return valve differs from the known technical solutions by its novelty, the valve is easy to manufacture, reliable, maintainable, competitive, and its use in the oil and gas industry will provide a positive technical and economic effect.

Claims (1)

A check valve, comprising a housing, an inlet and outlet nozzles, a baffle with a rod for a locking member located in the housing with the possibility of movement along the rod, the chamber having a conical surface on its inner diameter, characterized in that between the housing and the outlet the baffle connected to the rod through the adjusting ring, at the end of the rod there is a stabilizer with a supporting surface and channels for fluid flow, while the stabilizer is installed with an annular gap from relative to the conical surface of the chamber, and the locking element is made of elastic material with surfaces corresponding to the aforementioned conical surface of the chamber and the supporting surface of the stabilizer to block the channels for fluid flow and the annular gap between the stabilizer and the camera.

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