RU138106U1 - SHUT-OFF CRANE - Google Patents

Abstract

1. The stopcock, comprising a housing with inlet and outlet nozzles and a shaft with a shutter mounted on the bearing unit, a second bearing unit in which the second end of the shaft is located, in the middle part of the shaft there are trunnions made with an eccentricity relative to the ends of the shaft, characterized in that a sealing element is installed on the inner surface of the housing. 2. The stopcock according to claim 1, characterized in that the sealing element is made using babbitt.

Description

The utility model relates to stop valves and is designed to reliably shut off the flow of the working medium transported through the pipeline.

A known design of a valve with a rotary locking unit (RF patent 2189513, publ. 09/20/2002), containing a prefabricated body of two covers fastened by fasteners, in the cavity of which are installed three locking elements made of ceramic or other material, contacting with each other by end precision surfaces and passage windows, the outermost of the locking elements are installed in the cavity motionlessly in a tangential direction relative to the housing, and the middle - with the possibility of rotation relative to the housing by the drive. The extreme of the locking elements are made, for example, in the form of truncated cones, with large bases facing the middle locking element, and sections are formed from small bases on which membranes with elastic links are installed, fixed at one end to these sections, and to the other in lid seats corps. Passing windows in the extreme locking elements in the direction of the rotary element change their cross-sectional shape, move from the center to the periphery of the locking element.

A disadvantage of the known design is the complexity of the design, which consists in the complexity of manufacturing half-shells, a worm gear, locking elements, membranes, low tightness associated with the inability to install mounting studs in the upper part of the half-shells. In addition, friction is created between the locking elements, which leads to scratches and, subsequently, to “washing” of the sealing surfaces. The known design of the valve does not have a full (through) passage, which does not allow technological devices to pass through it (this is necessary for the oil and gas production process), therefore, it limits the scope of use.

The known design of a full bore valve (RF patent No. 9972, publ. 11/20/2010), which contains a housing with inlet and outlet nozzles, and a shaft with a shutter mounted on the bearing assembly, a second bearing assembly is additionally introduced, in which the second shaft end is installed, and in the middle part of the shaft there are necks made with eccentricity with respect to the ends of the shaft, stops are installed on the inner surface of the housing.

A disadvantage of the known design is the complexity of the repair, especially in the manufacture of large sizes of valves, which is very time-consuming and requires special expensive equipment.

The main requirements for valves installed on gas pipelines:

- durability and tightness of shutdown irrespective of the direction of movement

- corrosion resistance;

- explosion safety;

- reliability in operation and ease of maintenance;

- speed of closing and opening;

- minimum hydraulic resistance to gas passage;

- the ability to control the passage of gas;

- small construction length;

- small weight and overall dimensions.

The objective of the utility model is to increase the tightness of the valve when blocking the flow in both forward and reverse directions, increase reliability and increase the service life.

The technical result is achieved due to the fact that an additional sealing element is installed, the introduction of which prevented the possibility of leakage, and also simplified the repair of the crane during operation on oil equipment.

This task is achieved in that the stopcock comprises a housing with inlet and outlet nozzles, a shaft with a shutter mounted on the bearing assembly. A second bearing assembly in which the second end of the shaft is mounted. In the middle part of the shaft there are trunnions made with eccentricity relative to the ends of the shaft.

A sealing element is installed on the inner surface of the housing, which prevents the possibility of leakage of liquids.

The design of the stopcock is shown schematically in the figure.

The stopcock consists of a housing 1 with inlet and outlet nozzles, in which a shaft 2 is located with trunnions 3 made with an offset S from the axis of the shaft, i.e. the axis of the shaft 2 is eccentric. The shaft 2 is located in the bearing units 4 and 5. The shutter 6 is mounted on the trunnions 3 of the shaft 2. A sealing element 7 is installed on the housing 1, which is made using babbitt. The sealing element can also be made of Teflon material, either plastic or compacted rubber, depending on the temperature and pressure of the crane.

The stopcock works as follows:

Open position.

The opening of the shutter 6 is carried out by rotating the shaft 2 relative to the axis of the bearing units 4 and 5 until the stop element is reached in a clockwise direction. With further rotation of the shaft 2, the shutter 6 begins to move along the axis of the fluid flow using the eccentric trunnions 3 of the shaft 2 until the sealing element 7 is fully pressed against the housing 1. Since the shutter 6 is pressed against the housing 1 by the fluid pressure, it does not rotate together with the shaft 2 along the main the axis of the bearing units 4 and 5, and slides along the surface of the eccentric trunnions 3, which leads to the movement of the shutter 6 from the surface of the housing 1 along the axis by the amount of eccentricity S. When the value of the friction force between the surfaces of the shutter 6 and the housing 1 is equal to “Zero”, the shutter 6 rotates together with the shaft 2 relative to the axis of the bearing units 4 and 5 to the stop element, while the hole of the shaft 2 coincides with the hole of the housing 1. The shutter closes in the reverse order.

Closed position.

The shaft 2 is rotated counterclockwise, while the eccentric trunnions 3 of the shaft 2 move the shutter 6 from the housing 1 in the direction of the flow axis by an amount S equal to the eccentricity of the trunnions. Then there is a rotation of the shutter 6 together with the shaft 2 to the stop element. The tap is in the “Closed” position.

The proposed design of the crane has a high level of tightness, due to the design (the contact surface of the sealing surfaces of the housing and plug completely surrounds the passage and seals the valve shutter);

- less laborious manufacturing (lack of laborious machining and grinding of the sealing surfaces of the housing.

Using the proposed design of the crane eliminates friction, therefore, the occurrence of wear, scoring, scratches on the sealing surfaces, dramatically increase the durability of the work before restoration work.

An additional introduction of the sealant allows repair work under the conditions of use of the product, increases the life of the crane, and also positively affects the manufacturability of the design.

The design of the stopcock is simple to manufacture, reliable in operation and convenient in operation.

Using the positive features of the crane allows you to create more advanced new-generation valves for various operating parameters, any bore sections and working media with varying degrees of contamination.

The pilot production of the proposed design of the stopcock proved its effectiveness and fully confirmed aerodynamic calculations.

Claims (2)

1. The stopcock, comprising a housing with inlet and outlet nozzles and a shaft with a shutter mounted on the bearing assembly, a second bearing assembly, in which the second end of the shaft is located, in the middle part of the shaft there are trunnions made with an eccentricity relative to the ends of the shaft, characterized in that a sealing element is installed on the inner surface of the housing. 2. The stopcock according to claim 1, characterized in that the sealing element is made using babbitt.

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