Field of the Invention

The invention relates to shut-off devices and is a drain valve to drain water from a pipeline back into a source of protection against freeze, for example, for well suspension in the winter season or if repairs of the system are required. The growing need for domestic water supply systems, particularly from wells, and the production output of the relevant equipment require to expand the range and improve technical means intended to achieve this purpose.

Prior Art

A drain valve for submersible well pumps is known, which comprises a cage with a radial port, a nut and a diaphragm, characterized in that the diaphragm is made of elastic material; wherein a washer is placed between the diaphragm and the nut, a hole diameter of which corresponds to the value of the predetermined diaphragm rupture pressure with allowance for the strength in tension of its material (RU 111885)

A drain valve is known, which comprises a cage with an inlet port and an outlet port, inside which a lever with a locking element, a flyweight, a bolt and a nut are arranged in such a way that one of the lever parts rests on the generatrices of the interior surface of the cage located on the opposite side of the seat, and the locking element closes with an increase in the flow from the pump when the minimum permissible delivery is achieved; one end of the lever is pivotally attached to the cage, and the other one is bent; a discharge is provided in the form of a drain pipe with a seat positioned on the side wall of the cage; a clevis, wherein the seat and the locking element surface in contact with it are made flat; the drain pipe with a seat, the lever, and the clevis are made of plastic, characterized in that the lever is completed with a liquid flow divider, acting on the flyweight, wherein the flow divider is positioned on the lower side of the lever when the pressure upstream of the valve is high, and it is positioned as high above the flyweight as the washer thickness when the pressure upstream of the valve is within high and low values; wherein, when the pressure upstream of the valve is low, the lever is completed with an additional liquid flow divider, acting on the flyweight, positioned as high above the flyweight as the washer thickness.

The lever part designed in such a way that it is supported by the generatrices of the interior surface of the cage located on the opposite side of the seat is made of permanent magnet (RU2320826) A drain valve is known, which comprises a cage with an inlet port and an outlet port, inside which a level with a locking element is arranged; one end of the lever is pivotally attached to the cage, and the other one is bent; the discharge is provided in the form of a drain pipe with a seat positioned on the side wall of the cage; a clevis, characterized in that the lever is completed with a flyweight in such a way that the flyweight rests on the generatrices of the interior surface of the cage located on the opposite side of the seat, and the locking element closes with an increase in the flow from the pump when the minimum permissible delivery is achieved; the seat and the locking element surface in contact with the seat are made flat; the seat, the lever, and the clevis are made of plastic (RU 2222671, a prototype).

A disadvantage of this analogous solution is the possibility of water leaking in the situation when the pressure is not sufficient to press the inclined locking element to the seat being the reason of its low reliability.

Summary of the Invention

The technical problem which is addressed by this technical solution lies in extending the range and enhancing the efficiency of technical means which provide well-water supply, namely, drain valves.

The technical result achieved through the use of the claimed technical solution is to create an alternative configuration of the drain valve that is designed to drain the equipment for water supply from a well, and shows high reliability and durability, since it prevents any water supply disruptions and makes it possible to check visually the relative position accuracy of main components.

The essence of the invention is that the drain valve comprises a cage, a flat trim with an elastic sealing gasket placed in such a way that it interacts with the seat of the trim, which has an opening for flowing fluid, and a lever attached pivotally to an axis on the cage wall which is mounted in such a way that the trim can turn and move; therein, the first and the second insertion pieces with annular walls are positioned in the cage in sequence, and the locking element has a tail end and is completed with a pressing rod positioned on both sides of it; wherein the guides of the trim tail end are arranged in the first insertion piece; there is a hollow internal partition in the second insertion piece, in which a trim seat and a crosswise through-channel going through the annular wall are arranged for flowing fluid, as well as to position the lever therein; wherein a rod of the trim with its end supported by the pivoted lever mounted on a support in the cage wall, completed with a joining piece for a wire line at one end, and with an axis at the other end, is positioned in the opening of the above seat in such a way that it can move translationally along its axis.

The valve has preferably a two-piece cage which consists of an upper part and a lower part which are attached to each other with screws; the upper part has a male thread, a compression fitting is arranged from the outside of the lower part to connect a rising pipe of the pump, which consists of a nut, a collet, a retaining ring, and a sealing ring.

The pivoted lever axis is preferably mounted on a support which is formed by notches made in the side projections on aligned edges of the cage sections and a step of a crosswise through-channel in the second insertion piece.

The cage is preferably made with a lateral opening to attach to the lever joining piece, having the form of a lug.

Preferably, the trim rod freely rests with its rounded end on the flat pivoted lever.

Ribs are preferably arranged in the first insertion piece to fasten the guides of the tail end of the trim to the annular wall.

Ribs are preferably arranged in the second insertion piece to fasten its internal partition to its annular wall.

The second insertion piece is preferably completed with rubber rings to seal in the upper and lower parts of the cage.

Short description of drawings

The drawing in Fig. 1 shows a front view of the drain valve; Fig. 2 - section A-A in accordance with Fig. 1 ; Fig. 3 - section B-B in accordance with Fig. 1 , Fig. 4 — a flow chart of connecting the drain valve to the rising pipe adapter; Fig. 5 - a mounting arrangement of the drain valve in the casing pipe; Fig 6 - a flow chart of connecting the drain valve to the submersible pump; Fig. 7 - a flow chart of connecting the cord with the drain valve lever; Fig. 8 — a flow chart of connecting the free end of the cord with the drill hole cover plug; Fig. 9 - the upper part of the cage; Fig. 10 - the lower part of the cage; Fig. 11 - the insertion piece; Fig. 12 - the lever.

The following is shown in drawings:

1 - upper part of cage

2 - lower part of cage

3 - collet nut

4 - first insertion piece

5 - second insertion piece

6 - collet 7 - retaining ring

8 - lever

9 - trim

10 - lever axis

11 - notches of cage parts 1 ,2 for axis 10

12 - trim gasket

13 - insertion piece 5 seal

14 - insertion piece 5 seal

15 - collet seal

16 - screws to join cage parts 1,2

17 - crosswise through-channel of insertion piece 5

18 - adapter slide

19 - cage opening

20 - submersible pump 21 - cord

22 - casing pipe

23 - drill hole cover plug

24 - plug

25 - guides of trim 9 tail end

26 - trim 9 pressing rod

27 - trim 9 seat

28 - lug of lever 8

29 - central partition of insertion piece 5

30 - pipe connected to consumers

31 - rising pipe connected with pump 20

32 - internal rib of insertion piece 5;

33 - adapter (connection piece of drain valve and pipe 30).

All parts of the valve are made of chemically-passive polymeric materials.

The drain valve has a two-piece cage, which consists of an upper part 1 and a lower part 2 attached to each other by means of screws 16. The upper part 1 has a male thread Gl.

There is an integrated compression fitting on the outside of the lower part 2 to connect the rising pipe 31 with a diameter of 32 mm, which consists of a nut 3, a collet 6, a retaining ring 7, and a sealing ring 15.

The valve comprises a flat trim 9 with an elastic (rubber) sealing gasket 12 placed in such a way that it interacts with the seat 27 of the trim 9, which has an opening for flowing fluid. A lever 8 is pivotally attached on the axis 10 in the cage wall, which is mounted in such a way that the trim 9 can be turned and moved.

The first annular insertion piece 4 and the second annular insertion piece 5 are positioned in the cage in sequence in axial alignment and attached to each other with their annular walls mating with the cage.

The locking element 9 is made with a tail end and a pressing rod 26 positioned on both sides of it.

The guides 25 for the trim tail end 9 are arranged in the first insertion piece 4; there is a hollow internal partition (a sleeve) 29 having the box form, which is positioned diametrically in the second insertion piece 5, in the upper wall of which (according to the drawing in Fig. 11), i.e. on the side of its joint with the insertion piece 4, the seat 27 of the trim 9 is positioned. Therein a crosswise through-channel 17 for flowing fluid and angular travel of the lever 8 on the axis 10, which goes through its annular wall and the partition (sleeve) 29, is made in the second insertion piece 5. The channel 17 has geometric parameters (depth and width) sufficient to accommodate and turn the lever 8 at an angle that ensures pulling of the trim 9 together with the gasket 12 away from the seat 27.

The pressing rod 26 of the trim 9 with its end supported by the pivoted lever 8, which has a lug 28 that is used as a connecting element for the wire line (the cord 21) at one end and the axis 10 at the other end, and is mounted on a support in the cage wall, is positioned in the opening of the above seat 27 in such a way that it can move translationally along the axis.

The axis 10 of the pivoted lever 8 is mounted on a support which is formed by notches 11 made in the side projections on aligned edges of the first and second parts 1,2 of the cage and a step (not designated) of a crosswise through-channel 17 of the second insertion piece 5. Such a design ensures simple and reliable installation of the lever 8, when assembling the valve, and makes it possible to check the relative position of its main components.

There is a lateral opening 19 in the cage, which is connected with the crosswise channel 17 and provides access to attach the wire line (cord) 21 to a connecting piece - the lug 28 of the lever 8. The lever 8 has such a length as is necessary that its end with the lug 28 to protrude from the cage through the opening 19 formed by corresponding notches in the joint between parts 1 and 2 of the cage on the cage side opposite to notches 11. This provides access from outside to attach the wire line (cord) 21 to the lug 28. The pressing rod 26 of the trim 9 is freely supported with its rounded end by the flat pivoted lever 8.

Internal radial ribs are arranged in the first insertion piece 4 to attach the guides 25 of the trim 9 tail end integrated with it to its annular wall.

Internal parallel ribs 32 are arranged in the second insertion piece 5 to fasten the partition 29 with the seat 27 to its annular wall.

The second insertion piece 5 is completed with rubber rings 13,14 to seal in the upper and lower parts 1 ,2 of the cage.

Detailed Description of the Invention

Preferred embodiment

The drain valve is operated as follows.

A factory assembled drain valve is mounted in the casing pipe 22 of the well. The drain valve is designed specifically for mounting on a well adapter 33, but, if necessary, it may be mounted in the rising pipe section 032 through a combination sleeve with a 32x1 " female pipe thread.

The installation place of the drain valve must be below the freeze depth, and where it is installed in the rising pipe section - no deeper than 5 metres from the ground level to prevent any difficulties when it opens. Therein, the threaded upper part 1 of the drain valve cage is connected to the branch pipe of the slide 18 of the well adapter 33 along the thread Gl-B.

The rising pipe 31 with the submersible pump 20 is connected in the compression fitting (collet coupling) of the lower part 2 of the drain valve cage. Then the cord 21 is tied to the lug 28 of the lever 8.

Then the slide 18 assembled with the drain valve, the pipe 31 and the pump 20 are installed in the base plate (not designated) of the well adapter 33, which is mounted on the wall of the casing pipe 22.

A free end of the cord 21 is led, for example, through the cover body 23 of the well KC1 10-133, and tied to the plug 24, which has an opening, so that it is not stretched. The cover body 23 of the well KC 110- 133 is mounted on the end face of the casing pipe 22 with a plug 24, to which the cord 21 from the drain valve is tied.

With the pump 20 running, the fluid (water) is fed under pressure from the well to the pipe 31 and via the claimed drain valve via the pipe 30 - to a consumer (consumers). Therein, the trim 9 not spring loaded and its seat 27 are normally open, the valve is in its rest position as an open check valve, and it does not create significant resistance to the water flow.

For proper routine maintenance and/or repairs of the consumer's equipment, the water must be drained through the pipeline 30 in proper time. In this case, the pump 20 must be turned off, and the seat 27 of the trim 9 of the drain valve, which is under the pressure of the liquid (water) column as a closed check valve, should be forcefully opened.

The trim 9 is moved and opened by means of the cord 21 and the lever 8, which axis 10 is fastened in notches 11 between two parts of the cage in such a way that it can be turned. The lever 8, as it rises up, pushes the trim 9 with the rubber gasket 12; meanwhile, the seat 27 opens into the channel 17 and into the opening 19 in the cage to drain water in the casing pipe 22 via adapter 33 from the pipeline 30. The lever 8 is mounted on the axis 10 in such a way that it turns under the action of the wire line and thereby forces on the pressing rod 26 of the trim 6 of the valve, which is provided with a rubber gasket 12.

The drain valve has small dimensions, features increased reliability and durability, as it prevents corrosion and makes it possible to monitor the relative position accuracy of its main components.

Since the valve trim, when it is mounted in the casing pipe below its cover (wellhead), is constantly under the pressure of liquid (water) column. When the pump 20 is off, the valve provides full isolation of the water-bearing bed from the required utility networks; it prevents the water overflow from consumers; the wellhead is constantly ventilated; the service life of pumps and wells is increased several times and, consequently, the number of repairs, constructions and abandonment of wells is reduced several times.

Industrial applicability

Thus, the embodiment of the invention claimed will result in making an alternative unique drain valve and in the possibility of arranging its functioning and low-cost small- scale production.