Direct-acting Solenoid Valve Anatomy

Direct-acting Solenoid Valve Anatomy

The coil forms the drive system of the solenoid valve. Electrical energy is converted to a controlled magnetic force.

The plunger is precision turned part made of magnetic steel. It is moved by the magnetic field generated in the coil.

Closing spring:
The closing spring presses the plunger onto the valve seat to close it.

Electrical connection:
A broad spectrum of electrical connections is available. Many magnetic systems are designed for protection type IP 65.

Plunger guide tube:
Precision machined tube made of non-magnetic steel, in which the plunger is guided.

Shading ring (AC only):
This is needed only for AC coils. The shading ring represents a coil with one winding, which during zero crossing of the AC voltage induces enough residual magnetism to keep the plunger from dropping.

Air gap and stopper:
The stopper is part of the magnetic circuit and is firmly fastened to the plunger guide tube. The air gap is the distance between the stopper and the plunger. There should be no gap when the plunger is attracted, in order to generate an optimal magnetic force.

The coil is cast in polyamide or epoxy to protect it against damage and moisture. The coil temperature and ambient influences determine the material used for encapsulation.

The diameter refers to the inner diameter of the valve seat. It is relevant for the flow rate calculation.

Process connection:
The process connection is used for the fluidic connection of the valve in the pipe system. Standard DIN and ANSI connections are available, as well as special versions.

Valve seat:
The valve seat is the essential fluidic element. It is manufactured with high precision and formed according to the sealing principle.

The seat seal is the heart of the fluidic system. It is always adapted to the valve pressure, media temperature and chemical resistance.

Direct-acting Valve Anatomy

Solenoid valves are the most frequently used to control elements in fluidics. Their tasks are to shut off, release, dose, distribute or mix fluids (liquids and gases). They are confronted with many different requirements in a plethora of application environments and must offer:

– fast and safe switching
– high reliability
– long service life
– good medium compatibility of the materials used
– low control power
– compact design

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