Flow Regulating Valve

Abstract

The present flow regulating valve relates to devices for regulating the flow parameters of working media and can be used in equipment in the gas, oil, chemical, power, metallurgical and coal industries. The present flow regulating valve comprises a housing with a regulating element having inlet and outlet pipes with through passages and movable and immovable regulating teeth having a streamlined shape and terminating in a taper, wherein the size of the angle of the tapered portion is defined as 360/n, where n is the number of movable teeth. What is novel is that each tooth has an independent actuator, the immovable teeth have a cross section in the shape of an isosceles triangle, and the regulating zone has a cross section in the shape of a multi-point star. This design provides excellent characteristics in terms of response time and the overall weight of the structure, which is particularly relevant in the case of regulators having a cross-section diameter of 500 mm or more.

Description

FIELD OF THE INVENTION

The invention relates to devices for control of parameters of processing medium flows and can be used in equipment of gas, oil, chemical, power engineering, metallurgical and coal industries.

BACKGROUND OF THE INVENTION

The arrangement of regulating valve is known containing the body with inlet and outlet branch pipes with passage openings, the ball rotary gate with a V-profiled narrowed passage opening, and the ball rotary valve actuator (see http://flowserve.com.ru_RU/Products/Valves/Control/Ball)/.

A disadvantage of this arrangement is non-observance of axial symmetry of the controlled flow in the V-profile passage aperture, which causes increase of the water passage hydraulic resistance because of a significant narrowing and widening.

Saddle regulator valves are most frequent. Their disadvantages are a significant disturbance of the pumped medium flow due to variation of the passage shape and a large number of structural elements which disturb regular movement.

The second in terms of frequency of use is the design of a regulator valve by Mokveld Valves by, that is, Mokveld valve. It is an axial valve containing internal and external bodies performed as a single casting, a piston with a stem which moves along the valve longitudinal axis. The piston moves be means of a gear mechanism consisting of two toothed racks positioned to each other at 90° and being a part of the piston stem and the valve spindle, respectively. The gear mechanism is protected against effects of the processing medium by double primary seals installed on the piston stem and in its guide.

This arrangement is characterized with the following disadvantages:

• • traversing speed of the control mechanism is limited due to possibility of generation of an impulse wave during the piston movement due to the significant rated actuation time;
  • location of the regulating part in the middle of the flow leads to deformation of regular movement, especially of gases movement;
  • control is realized due to movement of the piston, which, apart from limitation of the passed medium amount, changes the nature of this movement and results in additional losses of the flow energy;
  • the gas flow changes its direction when flowing around the operating mechanism, and two more times at the angle about 90 deg when passing the perforation, with significant losses of the flow energy (not less than 30%);
  • hermeticity of closing of the regulator valve is achieved due to full displacement of the piston beyond perforation boundaries and can be disturbed in case of ingress of foreign objects when the pumped medium is polluted;
  • the regulator valve has a definite direction of the flow movement, that is, it cannot work in both directions;
  • all elements of the arrangement are exposed to the flow effect, which leads to their quick wear.

SUMMARY OF THE INVENTION

The goal of the current invention is increase of the valve actuating speed, decrease of energy losses, enhancing of resistance to wear, longevity and repairability.

The set goal is supported due to the fact that the flow control valve contains a body with a control element having the inlet and outlet branch pipes with passage openings and movable and fixed regulating teeth which are made stream-lined and ending with a wedge, whereas the value of the wedge-shaped part angle is determined as 360/n where n is a number of movable teeth. The novelty is that each tooth possesses its individual actuator, fixed teeth have the shape of isosceles triangles in their cross sections, while the control zone has the shape of a multi-beam star in its cross section.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 of the attached drawings, a general view of a present flow control valve is presented;

In FIG. 2 shown is vertical cross-sectional view of the same; and

In FIG. 3—shown is horizontal cross-sectional view of the same.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The flow control valve contains body 1 with inlet and outlet branch pipes 2. A control element is installed in the body having movable teeth 3, each of them having an individual actuator 4, and fixed teeth 5 having the shape of isosceles triangles in their cross sections. As a result of such arrangement, the flow throttling zone 6 has the shape of a multi-beam star.

The flow control valve works as follows.

By the action of individual actuators 4, movable teeth 3 move on fixed teeth 5; as a result of this movement, control of the flow is realized due to variation of the passage section area (or throttling zone) 6. Operation of actuators 4 is synchronized by means of certain devices not described herein.

Implementation of the flow control valve with independent actuators of movable teeth allows:

• • 1. When diameters of passage section exceed 500 millimeters, to make this arrangement independent on mechanical parts of the actuator which are large both in weight and overall dimensions;
  • 2. Speed of performing of control actions is significantly higher than that at the mechanical transmission of movement, which is also especially actual at large diameters of the passage section.

Claims

1. A flow regulating valve comprising: a body with a control element having an inlet branch pipe and an outlet branch pipe with passage openings and with movable and fixed regulating teeth;the regulating teeth being having a stream-lined form and ending with a wedge having an angle of the wedge determined as 360/n, where n is a number of the movable teeth,wherein each movable tooth has an individual actuator, fixed teeth have their cross sections in a shape of isosceles triangles, and wherein a control zone has its cross section in a shape of a multi-point star.