Solenoid valve (Electromagnetic valve) 0955401 – G 3/4; Dy 20 mm with indirect action produced from brass, designed for hot water

Solenoid valve is an electromechanical device that controls the flow of liquid or gas by using an electric current to activate a solenoid, which opens or closes the valve. They are commonly used in a wide variety of industrial and domestic applications where automatic or remote control of fluid is needed, including irrigation systems, washing machines, and factory automation.

Solenoid valves are primarily categorized by their operating method and the number of ports they have.

By operating method

• Direct-acting: These valves use the force of the solenoid alone to open or close the orifice. They are suitable for low-flow and low-pressure applications and can operate with zero pressure differential.
• Indirect-acting: These valves use a smaller “pilot” solenoid to control the system’s own pressure, which in turn operates the larger main valve. They are more energy-efficient and can handle higher flow rates, but they require a minimum differential pressure to operate.

By port and position

• Normally closed (NC): The valve is closed when de-energized and opens when power is applied.
• Normally open (NO): The valve is open when de-energized and closes when power is applied.
• 2-way valves: With two ports (one inlet and one outlet), these valves simply open or close to allow or block flow.
• 3-way valves: Featuring three ports (inlet, outlet, and exhaust), these valves can alternate flow between two different ports. They are often used to control single-acting pneumatic cylinders

Solenoid valves are used in a diverse range of systems, including:

• Irrigation systems: Controlling water flow to different zones on a schedule.
• Washing machines and dishwashers: Regulating the inflow and drainage of water.
• HVAC and refrigeration systems: Managing the flow of refrigerants and controlling air pressure.
• Automotive industry: Including variable timing solenoids that optimize engine performance.
• Medical and dental equipment: Precisely controlling the flow of fluids and gases.
• Industrial automation: Providing automatic control of fluidics in manufacturing processes.

The solenoid valves (electromagnetic valves) of these series are two-way, two-positioned, normally closed with indirect action. The solenoid valve have a certain direction of fluid flow, which is indicated on the body. Many of the solenoid valves (electromagnetic valves) are operating on digital principle. Because of this they have two states – when to the electromagnet (coil) is supplied electrical signal and when the valves are in idle state (no voltage is supplied). The valves function is determined of their state in which they are at the moment.

Technical specification in PDF – Solenoid Valve 0955401