What is a vacuum solenoid valve?

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1. How does the vacuum solenoid valve work?

The vacuum solenoid valve uses the electromagnetic principle to drive the opening and closing of the valve core or valve seat through the magnetic field generated by the electromagnetic coil, thereby controlling the circulation of vacuum or compressed air.

2. Function of vacuum solenoid valve

① Switch control of vacuum circuit.

② Anti-backflow protection: prevents outside air from accidentally entering the vacuum system and protects the vacuum state.

③ Automatic control: with PLC and other control systems, the vacuum solenoid valve can realize automatic operation.

④ Support different vacuum levels and flow requirements.

3. What are the solenoid valves used for vacuum?

① VT307 Series Direct Operated Poppet Type 3 Port Solenoid Valve (Rubber Seal)

② VT317 Series Direct Operated Poppet Type 3 Port Solenoid Valve

Working Principle: The valve core of the VT series direct-acting poppet valve adopts a poppet structure, which means that the valve core is directly driven up and down by the electromagnetic coil to open or close the valve.

Features: 

• Direct acting design: not dependent on pilot pressure, suitable for low pressure and vacuum systems.

• Lift valve structure: good sealing performance, high air tightness, stable switching action.

• A variety of models are available: VT307, VT317, VO manifold valve and other specifications, suitable for different flow requirements.

• Multi-function configuration: VT series single valve has 6 functions: including normally closed valve, normally open valve, diverter valve, selector valve, etc.

③ VK300 Series 3 Port Solenoid Valve, Direct Operated Poppet

Working Principle: The electromagnetic force directly drives the valve core to move up and down to achieve on-off control of the gas.

Features:

• Vacuum pressure: -101.2kPa

• Copper-free environmentally design: Copper-free material and vacuum compatibility meet clean room requirements

• Low power consumption: DC 4W (standard), DC 2W

• High flow: C = 0.80 dm³/(s·bar)

④ VGA342 Series 3 Port Air Operated Valve

⑤ VG342 Series Pilot Operated Poppet Type 3 Port Solenoid Valve (Rubber Seal)

Working Principle: The pilot valve is driven by the electromagnetic coil, and the pilot valve is used to control the opening and closing of the main valve to achieve gas path switching.

Features:

• Usable under vacuum and low pressure conditions: Vacuum: -101.2 kPa / Low pressure: 0 to 0.2 MPa.

• Low power consumption: DC 4 W (standard type) / DC 1.8 W (low power consumption type).

• Oil-free operation possible.

• Interchangeable actuator assemblies: N.C. (Normally Closed), N.O. (Normally Open), or external pilot type.

• Can be used as a selector valve or divider valve (external pilot type).

⑥ 3PA/3PB Series Direct Acting 3 Port Pneumatic Poppet Valve

3PA/3PB series structure is a pressure balanced type poppet valve, which is not affected by the working pressure and achieves a low wattage large flow rate performance.

⑦ VP3145/3165/3185 Series Large Size 3 Port Solenoid Valve (Rubber Seal)

Working Principle: The connection between the three channels (inlet, working port, exhaust port) is controlled by electrical signals. The pilot structure drives the pilot valve to operate when the electromagnetic coil is energized, controls the main valve to open or close, and realizes gas path switching.

Features:

• Large flow and low exhaust resistance.

• Suitable for use in vacuum and low pressure environments.

• Capable of switching between N.C. (Normally Closed) and N.O. (Normally Open) configurations.

• Elastomer sealing.

⑧ VNB Series Air Operated Process Valve for Flow Control

The VNB series vacuum solenoid valve can be used with a wide range of fluids such as air, water, oil, gasoline, vacuum, etc. by selecting different valve body materials and seal materials. Accurately adjust the fluid flow.

4. How to judge whether the vacuum solenoid valve is damaged?

① No action after energizing

Use a multimeter to measure the coil resistance. If it is open or short-circuited, the coil may be damaged.

② Valve stuck or slow response

Dismantle the valve body after power off and check if there is dirt or damage inside.

③ Vacuum cannot be established or leaks

Check if the valve seat and seal are aged, damaged or have foreign matter.

④ Abnormal heat or burning smell

Check if the coil surface and terminal are black or have burn marks after power off.

⑤ Abnormal noise

If you hear a buzzing sound or metal friction sound when power is on, it may be that the valve core is worn or the electromagnetic force is insufficient.

Vacuum solenoid valves are widely used in vacuum adsorption manipulators, packaging machinery, vacuum systems in the electronics industry, etc. If you want to know more product information, VPC provides selection suggestions and technical support, please contact vpc pneumatic!