Unox General Purpose Normally Open Solenoid Valves (0.5–16 BAR)

What is a General Purpose Solenoid Valve?

A general-purpose solenoid valve is a mechanical device that operates under the influence of a magnetic field generated around a coil when electric current passes through it. It is typically used to control the flow of liquids or gases such as water, air, oil, or gas. These valves can be opened or closed by connecting them to a control system such as a pilot valve, button, or control device. Solenoid valves are widely used due to their compact size and ease of control.

Solenoid valves are manufactured in two types:

• Normally Closed (NC): The valve opens when the coil is energized.
• Normally Open (NO): The valve closes when the coil is energized.

Where Are General Purpose Solenoid Valves Used?

General-purpose solenoid valves are electromagnetic devices used to control the flow of liquids and gases such as water, air, oil, or gas. They are commonly used in various fields such as automotive, household appliances, and industrial machinery and systems.For example, they can be used in automobile engines in injection systems, or in cooling systems of household appliances like refrigerators. Additionally, they are used in industrial processes and facilities to control fluid and gas flow.

Normally Open Solenoid Valve Working Principle

A normally open solenoid valve initially allows fluid to pass. To close the valve, an electric current is applied to the coil, activating it and pushing the core downward to seal the orifice opening. At this point, the internal pressure increases and pushes the diaphragm downward, closing the orifice through which the fluid flows.Within a short time, the pressure is evenly distributed over the diaphragm, and the increased pressure prevents the fluid from lifting the diaphragm again. Thus, the valve remains in the closed position. All these processes occur in a very short time. The product is designed for optimal efficiency.

General Features of Solenoid Valves

• Seal: NBR
• Sleeve: Brass
• Body: Brass
• Core: Stainless Steel
• Temperature: -10 / +90 °C
• Coil: Plug-in type

Recommendations for Solenoid Valves

• Install the solenoid valve with the coil facing upward.
• Use filters such as strainers before the solenoid valve in the system.
• For high temperatures, more durable diaphragm and sealing materials are used. Specify your requirement for high-temperature diaphragm and seals when ordering.

Things to Consider When Selecting a Solenoid Valve

• The coil must be suitable for the operating voltage (AC/DC).
• Proper protection and insulation should be ensured depending on the application. (The valve opens when energized and returns to the closed position when power is cut.)
• Minimum and maximum pressure values in the system are critical for valve selection.
• The type and temperature of the fluid directly affect valve selection.
• The flow direction must match the arrow marking on the valve body during installation.
• Since solenoid valves do not function as check valves, reverse flow may occur under back pressure. In such cases, installing a check valve after the solenoid valve is recommended.
• The pipeline where the valve is installed should be free from debris.

Solenoid Valves