SU1418663A1 - Control valve - Google Patents

Abstract

The invention relates to automatic control, in particular to devices for controlling the flow rate of a gaseous and liquid medium, and can be used in gas and oil production. The purpose of the invention is to expand the functionality. In the control valve, the sensitive element of the membrane 7 is made of an inelastic film, the diameter of which is 5-10% larger than the inner one; the diameter of the adjusting ring 1, a. On impulse lines 8 and 9, connected to inlet 5 and outlet 6 channels, variable hydraulic resistances 10 and 11 are installed - adjustable pressure dividers. The invention is easier to manufacture and more reliable in operation. 2 Il. xs w

Description

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about: about with

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: The invention relates to devices for controlling the flow of a gas-free and liquid medium flowing through pipelines, and can be used in the gas and oil industries.

The aim of the invention is to extend the functionality.

With decreasing P, by increasing. resistance 10 on the left half of the film a force arises

(Pi-rv) Fi.

This force raises the left half of the film, which, in turn, does not upwards the right half of the film, opening the outlet to those

Fig. 1 shows a diagram of the proposed time until a balance of power is created.

device; FIG. 2 is a sectional view of FIG. 1,

: The device consists of an enclosure, removed from the mounting ring 1, | the caps 2 with the control pressure channel 3, the bottom 4, the input 5 and the output 6 channels, are connected to the bottom 4 of the soft film membrane 7, secured by the cover 2 and the setting ring 1, freely lying IB unloaded condition (without a slab) directly on the bottom 4, and pulse lines 8 and 9, connected to channels 5 and 6 through an adjustable pressure divider consisting of variable hydraulic resistances 10 and 11 and connected to channel | 3 cover 2, supramembrane 12 and under; membrane 13 cavities, the device operates as follows m ob-; again.

 I

Pressure divider formed

adjustable hydraulic resistances 10 and 11, established

acting on the film

(P-PP-F (,). F .; where p2 is a variable value, equal to the area of the right half of the film (not pressed against the body).

With a further decrease in Pv, the right part of the film rises above, increasing the area Fj and, accordingly, 2Q, the cross section of the outlet, When P becomes equal to

p - 2

25

thirty

(with a symmetrical valve design), then the 5 valve is fully open at the same time. A change in P with a change in the flow rate of the medium does not affect the operation of the valve, as it simultaneously changes by the same amount and P, o

When selecting valve dimensions for reducing its hydraulic resistance, the maximum flow area of the valve is

on impulse lines 8 and 9, the lightness-35 is equal to the pipeline area.

I, delivers sub 2 valves i through channel 3, the control pressure P, y (one of the resistances, for example: resistance 11, is adjustable, the second resistance 10 is controlled by a regulator or manually). If resistance 10 is fully open, then:

 . where P is the control pressure;

P - pressure in the inlet channel. On the left half of the film area F, located above the inlet, on both sides approximately the same force acts. There is a force on the right floor pole, located above the outlet, proportional to

() where Pj is the pressure in the outlet channel. Under the action of this right force, half of the film is lowered, completely blocking the outlet opening, and is pressed against the bottom 4 of the body

acting on the film

(P-PP-F (,). F .; where p2 is a variable value, equal to the area of the right half of the film (not pressed against the body).

With a further decrease in the Pv of the right part of the film rises above, increasing the area Fj and, accordingly, the cross section of the outlet, When P becomes equal to

p - 2

(with a symmetrical valve design), then the 5 valve at the same time opens completely. A change in P with a change in the flow rate of the medium does not affect the operation of the valve, since it simultaneously changes by the same amount and P, o

When choosing the valve dimensions for reducing its hydraulic resistance, the maximum flow area of the valve is ensured by the appropriate choice of the thickness of the mounting ring L,. The diameter of the film D, stretched on a flat surface is

D, D + 2h, where D is the diameter of the mounting ring;

h is the thickness of the mounting ring;

Calculations show that at 50 mm D 500 mm the value is 2h ,. is 5-10% D.

So that the valve 2 valve does not limit the film travel h., 7 / hj, where hj is the height of the cover;

h is the height of the film rise.

The material of the film is chosen in accordance with the pressure, temperature and chemical composition of the controlled medium.

For cold air and low pressure gas, various rubberized fabrics can be used, for hot air, polyamide film, etc.

The valve can also be used as a shut-off valve, for which an electromagnetic valve is installed together with hydraulic resistance 10. If the line is blocked, i.e. ,, the valve is fully open.

In the working state of the valve, a vortex balance acting on the film is provided by varying the area of the film adjacent to the bottom, and this is achieved by controlling the flow rate of the liquid or gas.

Claims (1)

Invention Formula Control valve consisting of housing with mounting ring, times divided into two cavities, with the supramembrane cavity connected to the control pressure channel, and the submembrane cavity to the input and output channels, the orifices of which are placed in the bottom of the housing, characterized in that, in order to expand the functionality, the membrane is made of an inelastic film, the diameter of which is 5-10% greater than the internal diameter of the installation ring, and. An adjustable pressure divider introduced into the valve is connected by a midpoint to the control pressure channel, and the extreme points to the inlet and outlet channels -. FIG. 2