Direct-flow valve

The invention relates to the valve assembly, in particular to the axial flow control valves used in industrial pipeline fittings, and is intended for controlling and closing the working fluids and gases.

A straight-through valve is known for the Mokveld direct flow control valve [http://www.mokveldm.com/ / attachments / article 10 / 1-1.pdf] containing the outer and inner housings, the inlet and outlet branch pipes with flanges, the flow divider made in form of a perforated hollow cylinder, a locking device that is a piston with a drive of the translational movement, made in the form of a rack mechanism.

The disadvantages of this valve are the increased dimensions and complexity of the internal cavity due to the placement of the rotary motion transducer into the progressive crank type, as well as the complexity of the design, the occurrence of turbulent currents and cavitation.

The closest to the present invention is a straight-flow valve [Patent DE 102013108940 A1 IPC F16K 31/12] comprising an outer and an inner case, an inlet and an outlet with flanges, a flow divider in the form of a perforated hollow cylinder, the openings in which are arranged in circular rows, a locking device with a drive of the translational movement, the locking device is a shell, the inner surface of the shell interacting with the outer surface of the perforated hollow cylinder, which Execute closed at one end, and in the lateral parts - the surface of the inner shell.

The disadvantages of this valve include the complexity of the design, the emergence of turbulent currents and cavitation.

It is an object of the present invention to provide a ramjet valve with respect to a simple structure having a relatively low flow turbulence and cavitation.

The object is achieved in that in a straight-flow valve comprising an outer and an inner case, an inlet and an outlet branch with flanges, a flow divider in the form of a perforated hollow cylinder with openings in which are arranged in annular rows, a locking device with a translational drive in the form of a rack mechanism , the locking device is a shell, the inner surface of the shell interacting with the outer surface of the perforated hollow cylinder that is closed The outer surface of the shell is made in the form of two parts cylindrical and curvilinear, the cylindrical part in contact with the surface of the inner shell,

In Fig. 1 is a flow diagram of a ramjet valve. In Fig. 2 shows a section AA. FIG. 3 shows a view B. FIG. 4 shows a view B. FIG. 5 is a view of D.

The straight-flow valve comprises an outer shell 1, an inlet and an outlet 2 and 3 respectively, flanges 4 and 5, a flow divider in the form of a perforated hollow cylinder 6 with apertures 7. The locking device is a cylinder-conical shell 8. In order to reduce the hydrodynamic resistance to movement, the outer surface of the shell 8 is made in the form of two parts cylindrical and curvilinear. The cylindrical part of the shell contacts the surface of the inner body 10. To reduce the turbulence of the flow, longitudinal creeks 11 of curvilinear cross-section are formed on the curved part of the shell, the width and depth of which increases toward the edge of the shell.

This also allows you to direct the flow directly to the holes in the perforated hollow cylinder.

The number of streams is equal to the number of holes in the rows of the perforated hollow cylinder. In order to reduce the loading of the drive on the inner surface of the shell, radial partitions 12, connected in the central part by means of a rod 13 with a rack mechanism 9, are located in the area of ​​its cylindrical part. This allows to connect the cavities of the inner shell that vary in volume when the shell is moved.

The straight flow valve works as follows.

In the fully open position (the leftmost position of the shell 8, at which all the openings 7 are opened in the perforated hollow cylinder 6), the liquid enters the inner volume of the outer shell 1 through the inlet fitting 2. Next, the flow passes along the valve, flowing around the inner body 10, holes 7 of the perforated hollow cylinder 6. Passing through them, the liquid enters the outlet pipe 3.

The control process in this valve is performed by overlapping the holes 7 of the perforated cylinder 6 with the translationally moving shell 8, the inner surface of which interacts with the outer surface of the perforated hollow cylinder 6 and opens (moves to the left) or closes (moves to the right) the opening 7 when moving.

The closing of all the holes 7 of the shell 8 corresponds to the completely closed valve (the extreme right position of the shell 8).

The intermediate positions of the shell 8 correspond to the partial overlapping of the holes 7 (a part of the openings is open, the part is closed by the shell).

In order to reduce turbulence and cavitation effects, the outer surface of the shell is made in the form of two parts cylindrical and curvilinear, while the cylindrical part contacts the surface of the inner shell, and the curved part has longitudinal creeks whose longitudinal axes are parallel to the longitudinal axis of the valve, and the width and depth increase to the edge of the shell.

The presence of the curved portion contributes to a smooth flow direction to the holes 7 in the perforated hollow cylinder 6, the number of streams being equal to the number of holes in the rows of the perforated hollow cylinder. This helps to reduce turbulence flow.

Increasing the width and depth of the longitudinal streams to the edge of the shell also allows to reduce the turbulence of the flow due to the formation of stable currents in the transition zone from the curved part of the shell 8 to the holes 7 of the perforated hollow cylinder 6. In this case, the cavitation bubbles formed in the inner cavity of the perforated hollow cylinder are directed to the central zone of the flow and do not destroy the surface of the valve parts when collapsed.

The execution of longitudinal axes of streams parallel to the longitudinal axis of the valve, and the cross section of the curvilinear form forms a stable axial flow of the fluid and practically excludes the occurrence of lateral currents .

The proposed direct-flow valve has a relatively simple design, allows to reduce the turbulence of the flow and to reduce cavitation effects.