RU2692582C1 - Axial control valve - Google Patents

Abstract

FIELD: valve industry.SUBSTANCE: proposed device relates to valve industry and is intended for control and shutdown of fluids and gases working media. Axial control valve comprises external and internal housings, inlet and outlet branch pipes with flanges, flow divider made in form of perforated hollow cylinder, locking device, which is a cylinder-conical shell with a drive of translational movement in the form of a rack mechanism, on both sides of internal housing there are cylindrical dividers of flow of different diameter, contacting by their external surfaces with locking devices, which are interconnected and with drive of translational movement by means of rack mechanism, coaxially installed in internal housing are cylinder-cone shells – external and internal, and conical parts of each shell are directed to sides of flanges, and axes of holes in cylindrical flow dividers are inclined to valve axis, and angle of inclination of axes on each divider of flow is opposite.EFFECT: offered axial control valve has a relatively simple structure that allows to reduce cavitation effects and increase the service life.1 cl, 1 dwg

Description

The present invention relates to valves, in particular, to the axial flow control valves used in industrial pipe fittings, and is intended to regulate and shut off the working fluids of liquids and gases.

Known direct-flow control valve DN 100 - 1800 PN 10 - 160 [http://gpvalve.ru/files/images/doc/pdf731.pdf page 15] containing the housing, inlet and outlet nozzles with flanges, flow divider, made in the form of a set coaxially mounted perforated hollow cylinders; a piston with a drive and a converter of rotational motion into a translational motion, representing a crank-connecting rod mechanism.

The disadvantages of this valve are the increased size and complexity of the internal cavity due to the placement of the transducer of rotational motion in the translational crank type, as well as the occurrence of cavitation.

Closest to the proposed invention is a straight-through control valve [RF Patent №2646986], containing an external and internal housing, inlet and outlet nozzles with flanges, a flow divider made in the form of a perforated hollow cylinder, a locking device, which represents a cylindro-conical shell with a drive translational motion, made in the form of a rack mechanism.

The disadvantages of this valve include the complexity of the design, the occurrence of cavitation in the process.

The objective of this invention is the creation of an axial control valve with respect to a simple design that reduces cavitation.

The task is achieved by the fact that in an axial control valve containing outer and inner housings, inlet and outlet with flanges, a flow divider made in the form of a perforated hollow cylinder, a locking device, which is a cylindrical-conical shell with a drive of translational movement in the form of a rack mechanism, on both sides of the inner case are placed cylindrical flow dividers of different diameters, in contact with their outer surfaces with locking devices, presented connected to each other and with a drive of translational motion by means of a rack and pinion mechanism, cylindrical-conical shells coaxially mounted in the inner casing are external and internal, the conical parts of each shell are directed to the sides of the flanges, and the axes of the holes in the cylindrical flow dividers are inclined to the valve axis The angle of inclination of the axes on each divider is opposite.

FIG. 1 is a diagram of an axial control valve.

Axial control valve contains external 1 and internal 2 buildings, inlet and outlet nozzles with flanges 3 and 4. On both sides of the internal case 2 cylindrical flow dividers 5 and 6 are placed, which contact their external surfaces with locking devices representing connected with each other and with the drive translational motion 9 by means of a rack mechanism 10, coaxially mounted in the inner housing by cylinder-conical shells — the outer 7 and inner 8, with the conical parts of each sheath being directed to one hundred ones of the flanges and the axis holes 11 and 12 in the cylindrical flow divider 5 and 6 are inclined to the valve axis, wherein the tilt angle at each opposite flow divider. For installation of internal parts installed expansion sleeves 13.

Axial control valve operates as follows.

In the fully open position (all openings are open), the outer 7 and inner 8 cylinder-conical shells are retracted into the internal volume of the inner housing 2, and, in order to reduce the valve size, the inner 8 is retracted into the cavity in the outer 7 cylindro-conical shell.

In the intermediate position, part of the holes 11 and 12 are covered with surfaces of cylindrical-conical shells 7 and 8, which by means of a drive of translational movement 9 through the lath mechanism 10 are pushed out of the inner case. In this case, the fluid passes through the openings.

In the closed position (all openings are closed), the outer 7 and inner 8 cylindrical-conical shells are maximally extended from the inner volume of the inner housing 2.

Due to the fact that cylindrical flow dividers are placed on both sides of the inner casing, which contact their external surfaces with locking devices, this valve provides two-stage flow control. At the same time in the central part of the valve an intermediate zone is created with a pressure lower than at the inlet, but greater than at the outlet. This allows to reduce the pressure drop and reduce the cavitation effects.

In order to reduce the size of the valve and use a single actuator for locking devices (cylindrical-conical shells - external and internal), the latter are connected with each other and with the drive of translational motion by means of a rack and pinion mechanism and are coaxially mounted in the internal housing. The gear rim of the rack and pinion mechanism is placed on the inner surface of the cylindrical-conical shell 8 and the outer surface of the inner central part of the cylindrical-conical shell 7.

To reduce the load on the actuator and reduce the perturbation of the flow in the internal volume of the valve, the conical parts of each shell are directed to the sides of the flanges (opposite to each other).

Due to the fact that the axis of the holes in the cylindrical flow dividers are inclined to the axis of the valve, and the angle of inclination of the axes on each flow divider, the opposite fluid flow changes its direction less abruptly, which provides a low flow resistance when the valve is open. The implementation of cylindrical flow dividers of different diameters makes it possible to ensure a large flow rate at the first step along the flow of the fluid, thereby forming an intermediate zone inside the valve with a pressure less than at the inlet but greater than at the outlet necessary to reduce cavitation.

The proposed axial control valve has a relatively simple design that allows to reduce turbulence and cavitation effects, as well as to increase the service life of the valve.

Claims (1)

Axial control valve containing external and internal housings, inlet and outlet nozzles with flanges, a flow divider made in the form of a perforated hollow cylinder, a locking device, which is a cylindrical-conical shell with a drive of translational motion in the form of a rack mechanism, characterized in both sides of the inner housing are placed cylindrical flow dividers of different diameters, contacting with their outer surfaces with locking devices representing connected between Cylindro-conical shells, external and internal, coaxially mounted in the inner housing with the drive and translational movement through a rack and pinion mechanism, the conical parts of each shell facing the flanges, and the axis of the holes in the cylindrical flow dividers are inclined to the valve axis, and the angle of inclination of the axes on each flow divider the opposite.

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