Water solenoid valves are devices whose operation allows the passage of a fluid (liquid or gas) through the gap identified by the valve itself. The solenoid valve is actuated by an actuator (which traditionally was a human operator or a prearranged mechanical gearbox) that is electrically controlled (usually a solenoid).

Although the solenoid valve is functionally similar to an electrically controlled faucet, its operation differs substantially from that of an ordinary valve.

In fact, the simplest solenoid valve consists of a mechanical opening and closing device very similar to a diaphragm, which is raised or lowered to vary the pressure within the chambers of the device that then allow the escape or retention of the fluid introduced. This diaphragm is actuated by a solenoid, which, when current flows through it, attracts a ferrous core within an internal channel, thereby causing the mechanical displacement of the occluding element of the device, and thus the opening or closing of the solenoid valve. As the solenoid valve opens, the "diaphragm" rises and allows the fluid to branch into the ducts (broadly speaking) that are downstream of it, the upstream section being where the highest pressure exists.

Such simple solenoid valves can be actuated by direct or alternating current.

Each solenoid valve is classified according to the following characteristics:

- the arrangement of the internal conduits (ways and positions)

- the type of power supply (DC, AC)

- the balance conditions (monostable, bistable)

- the operating pressures at the input (minimum and maximum).

The indication of the number of ways (connection ports) and positions (end states of the outputs) is regulated by DIN ISO 1219 standards.

A monostable sol enoid valve has an equilibrium position that corresponds to the rest position, i.e., not energized. When energized, it activates; when the power fails, it returns to the rest position.

A bistable solenoid valve has two solenoids, each with its own power supply. The equilibrium position is the last one reached. To change positions, the solenoid corresponding to the other position must be fed briefly. If both supplies are turned on, or neither, the state of the valve does not change.

In addition to solenoid-operated solenoid valves, there are also other types of actuated solenoid valves, the action of which can be progressive.

Special case of solenoid valves are those used in engines with electronic fuel injection, where an electronic control unit opens and closes for very short times (milliseconds) the flow of fuel into the engine cylinders, depending on the need for use.

In this section you will find all solenoid valves and coils marketed by Comid.

Use the filters on the left to select the product best suited to your needs.

If you need help call us at 081 0900700 or email us at shop@comid.it