RU2378550C2 - Two-way diaphragm control valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention is related to the field of machine building and is intended for control of liquid flows that contain solid admixtures, viscous and aggressive mediums. Two-way diaphragm control valve comprises body with through axial hole, elastic membrane, covers with holes for supply and drain of control action of compressed air or another working medium. Body is arranged with two cavities located at its ends. Cavities are closed with covers with elastic membranes arranged in between. There are three channels in body, which are radially arranged to the centre. One of channels is connected to through axial holes and is simultaneously connected to both end cavities of valve body. Two other channels are accordingly connected only to one of mentioned end cavities of body by dead eccentrically arranged holes.

EFFECT: improved reliability and efficiency of operation of system that uses two-way diaphragm control valve.

2 cl, 3 dwg

Description

The claimed technical solution relates to the field of engineering, hydrometallurgy, chemical and others, and in particular to devices for controlling the flow of neutral, aggressive, viscous liquids and liquids containing solid impurities.

Known solution for the Catalog Valves / filters for different environments, 2004, p. 29, ES EM SI Pneumatic LLC, model VXD21402150 / 2260, Japan, diaphragm type valve for various environments 2/2, containing a housing made with a channel , membrane, cover. The control device is a valve accessory. The membrane with an elastic element overlaps the passage opening.

The advantage is the ability to control process streams containing solid impurities, viscous and aggressive environments.

However, the device is limited to only open or only close.

A known solution according to the catalog Control valves for technological processes, SAMSON, 2004, p.16, Germany, Type 3345 diaphragm valve, comprising a housing made with a channel, a membrane, a cover and an actuator.

The advantage is the ability to control process streams containing solid impurities, viscous and aggressive environments, however, it is characterized by structural complexity in the implementation of only one function - to block or allow the movement of the stream, which limits the application of this solution.

A known solution to the diaphragm valve is US Pat. No. 2,669,249 A, cl. F16 31/126 of 02.16.1954, comprising a housing with two radially spaced openings (inlet and outlet flow chambers), an axial bore, and one end cavity overlapped by a controlled diaphragm with a valve; a small channel compared to the main inlet opening for a part of the flow to pass through a cavity located in the second end cover of the housing with a passive diaphragm located between them with a valve blocking the passage in the cover when the main flow passes through the valve body with the control diaphragm valve open.

The advantage of this solution is to ensure in any case the passage of either the main stream or a small part of it to the consumer. However, it is characterized by the technological complexity of the design and the lack of a function of complete flow shutoff. In addition, the presence of a small hole in the body and passive diaphragm excludes the valve from working with streams containing solid impurities. In addition, the valve in question is designed for positional (only 2) “open” - “closed” small and large flow, i.e. cannot perform the function of continuously regulating in the range from flow rate to large; it does not provide flushing of the total total section of the valve. This leads to unsteadiness of the valve characteristics in the presence of solid inclusions in the flows.

A known valve design solution according to US patent No. 2912006 from 10.11.1959, the valve Design consists of an elongated body with chambers closed at their ends, perforated diaphragms to center a movable rod passing through an axial hole of a larger diameter than the diameter of the rod between the chambers, with valves placed on the diaphragms to close the cavities, depending on the axial location of the stem with manual control of its movement; the housing has three connection ports, one of them is connected to a passage hole located between the valve seats, and the other ports are respectively connected to the corresponding cameras; the valve stem extends through the cavity beyond the axial ends into the chambers, said valve stem has a smaller cross-sectional area than the passage path, and thus determines the area through which fluid can flow between the said chambers and this port.

The advantage of this solution is the possibility of changing the flow direction, however, the complexity of the design, its low technology, the presence of movable elements with seals in the zone of passage of the main stream, manual control of the change in the direction of flow makes it difficult to use this solution in automatic flow control systems, and also reduces the reliability of the entire system. The use of a valve of this design excludes the possibility of its use when working with streams containing aggressive media and solid impurities. There is also no function of complete flow shutdown.

The aim of the development is to simplify the design and increase the reliability of the operation, expand the functionality of the devices in which the valve is installed, namely, to obtain the ability to change the direction of flow — open, close and continuously adjust the flow rate over a wide range.

The goal is achieved as follows.

Two-way controlled diaphragm valve, comprising a body with a through axial hole, elastic membranes, covers with holes for supplying and discharging control compressed air or other working medium, and an actuator with any working medium, characterized in that the body is made with two cavities located at its ends, closed lids with elastic membranes located between them, and in the housing, radially to the center, three channels are made, one of which is connected to a through axial hole that simultaneously connects to eimi end cavities of the valve body, and the other two - are respectively connected to only one end of said housing cavities eccentrically located blind hole; in order to prevent the diaphragms located and sandwiched between the housing and the cover from being displaced when applying control compressed air or other working medium, the housing and covers are made with locks in the form of a protrusion of any configuration and a reciprocal recess, respectively.

The valve body is made of materials resistant to aggressive environments.

The invention is illustrated in the drawing, where figure 1 shows a two-way controlled diaphragm valve; figure 2 is a section along aa of figure 1; figure 3 is a section along BB in figure 1, in which:

1 - case with a lock;

2, 3 - diaphragms;

4 - through axial hole;

5, 6 - covers with a lock;

7, 8 - channels for supplying control air (impact);

9, 10 - working cavity;

11, 12, 13 - channels located radially to the center;

14, 15 - blind eccentrically located holes.

The essence of the proposed technical solution is as follows.

The two-way diaphragm valve controlled in FIG. 1 comprises a housing 1 with a lock and with a through axial hole 4,

channels 11, 12, 13 located radially to the center,

channels 7 and 8 of the supply of control air,

the housing is made with two cavities 9 and 10 located at the ends, closed by elastic membranes 2 and 3,

and equipped with hermetically connected to the housing 1 covers 5, 6.

The valve operates as follows.

1-3, when controlled compressed air or other medium is supplied into the channel 8 of the cover 6, the diaphragm 2 blocks the axial hole 4, allowing the main stream to pass from the radially located channel 11 through the axial hole 4 into the cavity 9 to the radially located channel 12. When switching control action and the supply of compressed air or other medium to the channel 7 of the cover 5 and the discharge of compressed air or other medium from the channel 8, the diaphragm 3 blocks the axial hole 4 from the opposite side, allowing the main stream to pass from a radially located channel 11 through the axial hole 4 of the cavity 10 and a blind eccentric hole 15 in the channel 13. When applying a control action and supplying compressed air or other medium to the channels 7 and 8 of the covers 5 and 6 of the diaphragm 2 and 3 cover the axial hole 4 s two sides, thereby blocking the movement of the main stream from the radially located channel 11 completely.

The technical result from the use of the proposed technical solution is:

- in obtaining the possibility of regulating the movement of flow in a wide range - fully open, close, and also regulate between these limit values;

- in providing the ability to control process flows of viscous and aggressive liquids containing solid impurities;

- to increase the reliability of the system due to the lack of moving valve elements (rods, seats, actuator) and the possibility of changing the cross-section of the holes to fully open and manufacturability and simplicity of design.

The simplicity, reliability and manufacturability of the design allows the device to be used in automatic systems with minimizing maintenance and regulation errors due to the stability of the valve characteristics.

Claims (2)

1. A two-way controlled diaphragm valve, comprising a body with a through axial hole, elastic membranes, covers with holes for supplying and removing the control action of compressed air or other working medium, characterized in that the body is made with two cavities located at its ends, closed with covers the elastic membranes located between them, and in the housing, radially to the center, are three channels, one of which is connected to the through axial holes, simultaneously connected to both end faces Lost valve body and the other two are respectively connected with only one of said end cavities blind housing eccentrically disposed hole. 2. The valve according to claim 1, characterized in that the housing and covers are made with a lock in the form of a protrusion and reciprocal recess.

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