DE2324580A1 - MAGNETIC VALVE - Google Patents

Description

magnetic valve

The invention relates to an electrically piloted solenoid valve with a diaphragm-like drive element in a non-impact design for controlling liquids.

Generate liquids controlled by solenoid valves Depending on the pressure, pipe diameter, pipe length and closing speed, this is often a disturbing and impermissible pressure increase during the closing process, which is prevented by special constructive measures and precautions or must be kept to a minimum. Since only the closing time., which is determined by the size of the throttle bore in the diaphragm, as the only factor that depends on the solenoid valve Here affects the pressure rise, provisions for improvement can only be made in this area.

Valves of this type usually have an optimal size of the throttle bore in the control diaphragm or in the piston or in a control channel that provides the necessary connection between the pre-pressure and the space above these drive elements manufactures. This orifice determines the closing time and the pressure increase; but has a tolerable and permissible increase in pressure result in a long closing time.

Valves are also known in which the throttle or control cross-section is adjustable by means of adjustable screws and can thus be adapted to the operating conditions.

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Further designs that have become known have conical or step-like set screws which are arranged in the area of the diaphragm or the piston and, through the stroke movement during the closing process, effect a path-dependent metering of the control medium. In particularly complex designs, damping pistons are also provided that limit the closing speed.

The known valves have the disadvantage that they are stuck at arranged bores cover only a limited pressure range and, for example, at low pressure a much too have a long closing time or no longer close without impact at higher pressure. Adjustable, but fixed throttle bores must be set on site and then meet the requirements for possible pressure fluctuations not or also have too long closing times; in addition, they are susceptible to dirt or require an additional one Sieve. The path-dependent throttling largely fulfills the required task, but is very complex and requires depending on the Construction mostly an adjustment or adjustment on the spot.

The invention is based on the object of providing an impact-free and quick-closing, pressure-independent and trouble-free To create a valve with a simple structure that has the advantages mentioned achieved without additional adjusting screws or adjustment measures.

According to the invention, this object is achieved in that the membrane on its movable part in the area of the outer Diameter of the membrane holder contains at least two or more throttle bores, which in diameter, in the shape

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-3-

and arrangement are designed so that they are in the open position of the valve and during most of the closing process are free and shortly before the closed position of the outer one Hand of the diaphragm plate are partially or completely covered or closed.

Further embodiments of the invention emerge from the subclaims.

The advantages achieved by the invention are in particular that the multiple throttle bores, which are not covered by the diaphragm plate in the open valve position, the closing process is initiated quickly or a high Closing speed reached and shortly before the end of the closing path by partially covering the bores the closing process is greatly delayed, thus avoiding undesirable water hammer. By the arrangement and the presence of several throttle bores in the movable part of the diaphragm is such a valve also far less susceptible to failure with regard to foreign bodies and dirt carried along in the medium.

Embodiments of the invention are shown in the drawings and are described in more detail below. It demonstrate

Figure 1 shows a cross section of the electrically piloted solenoid valve in the de-energized or closed state,

FIG. 2 shows a cross section of the electrically piloted solenoid valve under current or in the valve-open version,

FIG. 3 shows a cross section of the membrane system with a membrane plate in a curved design,

FIG. 4 shows a cross-section of the membrane system in a flat design,

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Figure 5 is a plan view of a membrane system,

Figures 6 and 7 details in the area of the throttle bore.

The valve structure according to Figures 1 and 2 consists of the valve body (1), the flanged valve cover (2) and the solenoid (3) with magnetic core (4)., membrane (5), which with its outer edge at the same time the housing seal and with its smaller diameter forms the valve seat seal and is centrally screwed to the diaphragm plate (6) and the guide star (7). In the membrane (5) the throttle bores (8) and (9) are provided that connect the pressure chamber (10) below the membrane (5) with the pressure chamber (11) associate. Depending on the switching position of the magnetic core (4), the pressure chamber (11) is above the auxiliary control seat and the control channel (13) with the valve outlet (14) in connection.

If the magnet (3) is electrically excited, the magnet core (4) opens the auxiliary control seat (12) and relieves the pressure on the pressure chamber (11) via the control channel (13). Dps lifts the medium pending in the pressure chamber (10) the membrane (5) and thus opens the main valve (Figure 2). In this switching position, the diaphragm plate (6) is different from the curved one Part of the diaphragm (5) is lifted off so that the throttle bores (9) are exposed. When the magnet is switched off (3) the auxiliary control bore (12) is closed again; consequently, the medium pressure in the pressure chamber (10) can increase the throttle bores (8) and (9) also in the pressure chamber (11) again build up and initiate the closing movement of the membrane system. The additionally exposed throttle bores (9) stand for a relatively large throttle cross-section is available for most of the stroke until shortly before the closed position, see above

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that a rapid closing process takes place over this stroke range. By training and shaping the throttle bores (9) this cross-section is closed steplessly shortly before the closed position, so that for the last closing phase only a reduced throttle cross-section (8) is available and thus the closing speed is greatly delayed will. The optimal design of the cross-sections of the throttle bores (8) and (9) enables very short closing times a closing process that is completely free of pressure surges at the same time. The further arrangement of several throttle bores increases the operational safety against foreign bodies carried along in the medium.

In Figures 3 to 7 are further details or special shapes and designs of the throttle bores and the diaphragm plate shown, with manifestations on the diaphragm plate or ring-shaped, valve seat-like closed or open elevations contribute to the safe or partial sealing of the throttle bores,

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Claims (1)

Protection claims Electrically piloted solenoid valve with flat or curved diaphragm and diaphragm plate, especially for Control of liquid media, characterized in that the membrane on its movable part in the area of the outer diameter of the membrane holder contains at least two or more throttle bores, the diameter of are designed in shape and arrangement so that they are in the open position of the valve and the largest part of the closing process are free and shortly before the closed position from the outer edge of the ^ embranteller partially or completely covered or closed. Electrically pilot-controlled solenoid valve according to Claim 1, characterized in that the throttle bores have different Are arranged at a distance from the valve axis. Electrically piloted solenoid valve according to Claims 1 and 2, characterized in that the throttle bores are of annular Bumps are surrounded. Electrically pilot-controlled solenoid valve according to Claims 1 to 3, characterized in that the ring-shaped elevations with one or more interruptions are provided. 5. Electrically piloted solenoid valve according to claim 1 and 2, characterized in that on the diaphragm plate at a distance 409849 / 0Q57 the throttle bores expressions are provided. 6. Electrically piloted solenoid valve according to claim 1 to 5, characterized in that the bores or cross-sections the throttle bores are different. 7. Electrically piloted solenoid valve according to claim 1 to 7, characterized in that one of the throttle bores is arranged outside the outer diaphragm plate diameter. 8. Electrically piloted solenoid valve according to claim 1 to 7, characterized in that the outside of the mem br ant eller diameter lying throttle bore a substantial
has a smaller cross-section than that of the covered throttle bore. 409849/0057