RU26257U1 - VALVE REGULATING MICROFLOW - Google Patents

Description

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The utility model relates to the field of pipe fittings and can be used in chemical, petrochemical and other industries for regulating micro-expenditures.

The well-known VARIPAK micro-flow control valve (instructions for VARIPAK - Masoneilan Dresser Series 2800) has a shutter consisting of a plunger and a seat; the required flow rate is provided by adjusting the plunger stroke using a complex special drive. The use of this actuator significantly increases the cost of the control valve.

Closest to the proposed technical solution is a single-seat bellows control valve M65241 (INDUSTRIAL PIPELINE FITTINGS. Catalog, part IV, -M: TSINTIkhimneftemash, 1991. 123), in which a standard membrane actuator (MIM) is used. The regulatory body is a plunger with locking and regulatory parts. The hole for the regulating part of the plunger is made directly in the housing. But the use of such a regulatory body significantly increases the complexity of manufacturing the valve due to the high requirements for alignment of the cylindrical surfaces of its locking and regulating parts. In addition, when the regulating part of the plunger is worn out, it is necessary to replace the plunger and the casing at the same time.

The technical task that was posed during the development of this utility model is:

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a) manufacturability;

b) reduction of manufacturing costs;

c) improvement of maintainability indicators (reduction of time and costs for restoration of working condition)

The problem is solved due to the fact that in the control micro-flow valve containing a membrane actuator, a housing, a nozzle for supplying a working medium located under the plunger, a saddle with a guide hole for the plunger, a plunger with a locking and regulating parts and a rod connected to the locking part the plunger, and the locking and regulating parts of the plunger are made on the same axis separately from each other, the regulating part of the plunger is included in the cylindrical insert of the seat, located under the sealing surface the saddle, and is pressed to the end of the locking part of the plunger by a cylindrical compression spring, and the diameter of the regulating part of the plunger is less than the diameter of the sealing surface of the saddle.

The figure depicts a micro-flow control valve.

The valve comprises a MIM 1, a housing 2 with a seat 3 mounted therein with a cylindrical insert 4, a locking part of the plunger 5, a stem 6, a regulating part of the plunger 7, a sleeve 8 and a spring 9.

The valve operates as follows.

When the control air pressure in MIM 1 (in the case of applying MIM reverse action) below the lower boundary of the permutation range, the locking part of the plunger 5 is in the lower position, i.e. valve is closed. When the control pressure in the MIM increases above the lower boundary of the permutation range, the shut-off part of the plunger 5 rises, the valve opens, providing a flow of the working medium through the control valve

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part of the plunger 7 follows the locking part of the plunger 5, because it is pressed to the last spring 9 through the sleeve 8. Moving the regulating part of the plunger 7 leads to an increase in the open cross-sectional area in the valve, an increase in the flow rate of the working medium through the valve. An increase in the control pressure in the MIM to the upper limit of the permutation range leads to a full stroke of the plunger and an increase in the flow rate through the valve to the maximum. Thus, a change in the control pressure in the MIM within the permutation range corresponds to the full stroke of the plunger and, accordingly, a change in flow from the smallest to the largest . The required flow rate through the valve is set by setting the appropriate control pressure in the MIM.

The tests showed that the proposed utility model provides:

- cost reduction in the manufacture of the valve due to the simplification of the design;

-the manufacturability of the valve, because when separately performing the locking and regulating parts of the plunger, it is not necessary to maintain high requirements for the alignment of the cylindrical surfaces, respectively, of the locking and regulating parts of the plunger, the guide holes for the plunger in the saddle and the holes in the cylindrical insert for the regulating part of the plunger, because the displacement of the interacting ends of the locking and regulating parts of the plunger allows you to compensate for their misalignment without compromising the regulatory process;

- reduction of time and costs for the restoration of the operational state of the valve, because when the regulating part of the plunger and cylindrical insert is worn, only the specified parts are replaced.

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Claims (1)

A micro-flow control valve containing a membrane actuator, a housing, a nozzle for supplying a working medium located under the plunger, a seat with a guide hole for the plunger, a plunger with shut-off and control parts, and a rod connected to the shut-off part of the plunger, characterized in that the shut-off and control parts of the plunger are made on the same axis separately from each other, and the regulating part of the plunger is included in the cylindrical insert of the seat located under the sealing surface of the seat, and is drawn to the torus The locking part of the plunger has a cylindrical compression spring, and the diameter of the regulating part of the plunger is less than the diameter of the sealing surface of the seat.