RU176492U1 - CHECK VALVE - Google Patents

Abstract

The utility model relates to equipment for the hydrotransport of bulk solid materials, namely to the elements of the pipeline, and is intended to block the reverse flow of the hydraulic mixture. This device can be used in installations for hydrotransport of ore, tailings and building materials. The check valve consists of a housing in which a movable gate is located, consisting of the upper part, a locking part is rigidly attached to it, the other end adjacent to the wall of the housing and the lower part, as well as from springs fixed in the housing. Installation of a pipeline for drainage of fluid is provided in the housing. A non-return valve will improve the reliability of the check valve in case of a pump shutdown during the hydrotransport of bulk solids.

Description

The utility model relates to the field of hydrotransport of bulk solids and is intended to block the return flow of a liquid medium containing solid particles. This device can be used in installations for hydrotransport of ore, tailings and building materials.

A non-return valve is known (USSR author's certificate No. 396512, published on 08.29.1973), which consists of a housing with a seat and pivotally suspended in it using a disk shutter lever. To ensure the flushing of solid particles of the transported material from the sealing surface of the saddle when closing, a lid with a fitting is fixed on the shutter disk so that an annular cavity is formed between them, communicating with the high-pressure line and having a slot exit on the periphery of the disk directed to the sealing surface of the saddle.

This design has low reliability, since the annular cavity on the shutter disk is connected to the high-pressure line using a flexible hose that will undergo wear during transportation of solid bulk materials. Such a valve may not work when the pumps are disconnected from the mains for various reasons, or it will work like a regular valve with a shutter.

A device is known (USSR author's certificate No. 1569491, publ. 06/07/1990), in which flushing fluid is supplied into an annular cavity made in the valve seat of two concentric rings. In order to increase reliability, one of the rings is installed with the possibility of movement along the axis of the valve and is loaded with a spring. Such a valve has low reliability, because when the hydrotransport installation is disconnected from the electric network, the shutter may not close completely due to solid inclusions in the transported network.

Known check valve (USSR author's certificate No. 155579, publ. 07.04.1990) with the aim of increasing reliability is made with a mechanism for additional shutter lift in the form of a pipe. In this case, the outer surface of the nozzle and the inner surface mating with it have the shape of a torus, the axis of which is located on an arc of a circle centered on the axis of the hinge connecting the shutter to the housing, and the nozzle is mounted on the shutter disk.

The disadvantage of this device is that in such a valve there is a change in the direction of fluid movement in the inlet pipe, while the liquid will experience additional resistance about the valve pipe.

Known check valve (patent RU No. 2032845, publ. 04/10/1995) shows the design of the check valve. The valve comprises a seat and a shutter arranged in a housing with a passage channel and connected by a hinge to a rotary lever, characterized in that in order to increase the reliability of operation, said hinge is located below the center of gravity of the shutter, and its upper edge is elastically pressed against the lever.

The disadvantage of this device is that in the lower part of the valve accumulates a solid phase of the hydraulic mixture, which will be compacted during operation of the valve and subsequently will not allow the shutter to close completely.

Known check valve (patent RU No. 2125676, publ. 01/27/1999), which is installed on a vertical section of the pipeline containing an expanded section attached to it with the formation of an internal conical surface, while in the expanded section there is a shut-off element made with a rod installed in guides, characterized in that the expanded section of the pipeline is plugged with a lid and provided with a lateral outlet pipe.

The disadvantage of this device is that there is a change in the direction of flow of the transported slurry, which increases the hydraulic resistance of the valve, while solid particles will wear out the shut-off element.

Known wear-resistant locking node "IGR" (patent RU No. 2516758, publ. 05/20/2014), adopted for the prototype, containing a housing with bores, inlet and outlet pipes, mounted saddles and a flat gate with a bore, locking part, transverse grooves and annular ceramic elements on both sides of the locking part, while the transverse grooves are made at a distance of not less than the contact width of the saddle from the edge of the gate bore, and the contact surfaces of the seats are equipped with annular ceramic and elements.

The disadvantage of the prototype is that such a device is intended only for forced shutdown of a moving fluid flow and cannot automatically shut off the flow when the pump is turned off.

The technical result of the utility model is to increase the reliability of the check valve used in hydrotransport installations and reduce the hydraulic resistance created by it.

The technical result is achieved by the fact that the gate is made of a L-shaped form, the locking part of which is made in the form of a wedge and rigidly connected in its upper part with the possibility of its free movement in the vertical direction, and the upper and lower non-working cavities of the body are connected to the pipeline to remove leaked liquid .

The check valve is presented in the figures:

FIG. 1 - valve in the closed state;

FIG. 2 - valve in the open state;

FIG. 3 - gate design;

FIG. 4 - gate view on the left, where:

1 - valve body;

2 - spring;

3 - pipeline;

4 - the upper part of the gate;

5 - locking part;

6 - the lower part of the gate;

7 - output pipe;

8 - spring;

9 - inlet pipe;

10 - cover.

The non-return valve consists of a housing 1 (Fig. 1), in which a movable gate is located, consisting of an upper part 4 connected to a locking part 5 and a lower part 6, as well as a spring 2 fixed to the cover 10 and a spring 8 fixed to the housing 1 respectively. The locking part 5 is a wedge, which is rigidly attached to the upper part of the gate 6. The inlet pipe 9 and the outlet pipe 7 are adjacent to the housing. A pipe 3 is connected to the housing to discharge fluid from non-working valve cavities.

The check valve operates as follows. In the closed state, the shutter is in the lower position under the action of its own weight, while the locking part of the gate 5 overlaps the outlet pipe and prevents the flow from moving in the opposite direction. When applying the slurry in the working direction, a force arises which moves the shutter to the upper position due to the difference in the areas of interaction of the liquid with the upper and lower parts of the gate. The mass of the gate and the difference in the areas of the upper and lower parts of the gate, interacting with a hydraulic mixture, are calculated so that when the working pressure in the pipeline, the valve is always open. When the pump is turned off, the pressure at the pump outlet drops, and under the influence of its own weight, the gate drops, obstructing the movement of the flow of the transport mixture, while the wedge-shaped locking part 5 prevents seizing in the event of large inclusions of solid material in the region of the valve seat surfaces. Springs 2 and 8 are needed to prevent impact of the upper 4 and lower parts of the gate 6 against the housing 1 and the cover 10. The pipe 3 is necessary to drain the fluid seeping through the slit gaps between the gate and the housing.

The distinguishing features of the utility model are the constancy of the direction of the moving flow, the absence of narrowing of the flow, valve actuation due to the working pressure of the fluid acting on the upper part of the gate. The gate is L-shaped. The gaps between the gate and the valve body do not require a tight seal, since all the liquid that has got into the non-working cavity of the valve will go through the pipe 3 to the original tank, and the large hydraulic resistance of the gap between the gate and the body will reduce the loss of fluid in the transported stream.

The device will improve the reliability of the check valve in the event of a pump shutdown during transportation of bulk solid materials using a hydrotransport installation.

Claims (1)

The non-return valve, comprising a housing with passage holes, inlet and outlet nozzles, a gate with a passage hole and a locking part, characterized in that the gate is made in the L-shaped form, the locking part of which is made in the form of a wedge and is rigidly connected in its upper part with the possibility of it free movement in the vertical direction, and the upper and lower non-working cavities of the body are connected to the pipeline to remove leaked liquid.

Images