What is vacuum solenoid valve?

vacuum solenoid valve

Vacuum solenoid valve is an electrically controlled valve installed on the mechanical vacuum pump to prevent suckback of vacuum oil to vacuum system.

How does vacuum solenoid valve work?

The vacuum solenoid valve and the vacuum pump are connected to the same power supply. The ON/OFF operation of the pump results in the same of the solenoid valve. When the pump stops or the power supply is accidentally off, the valve closes the vacuum system automatically. Therefore, the vacuum pump oil will not be sucked back to the vacuum chamber and pollute the vacuum system.

The installation of such a solenoid valve is considered as an extra protection in case an anti-suckback valve is integrated at the inlet of the vacuum pump.

Working principle of a solenoid valve

The solenoid valve, or electromagnetic valve, features a solenoid, which is an electromagnetic coil with a movable plunger in the center. Driven by AC or DC power, the plunger is lifted or lowered to open or close the valve orifice. The valve is used as a basic component for a system to control the fluid, steam or gases automatically and remotely. As for vacuum solenoid valve, it’s used for air or non-aggressive gases.


The vacuum solenoid valves are commonly used in HVAC vacuum pumps, industrial vacuum systems as well as industries of flat panel display, scientific equipment, semiconductor, industrial degassing, vacuum infusion, distillation, etc.

Difference between vacuum solenoid valve and ordinary solenoid valve

  • Vacuum solenoid valve is a direct-acting or assisted lift solenoid valve. Ordinary solenoid valve is generally a pilot operated solenoid valve which requires pressure differential.
  • Vacuum solenoid valve cannot use gap seal due to its high leakage requirement. NBR, PTFE or FKM seals are commonly used.
  • The airflow sequence is different because the vacuum causes backflow.
  • Vacuum solenoid valve is generally made of stainless steel, while ordinary solenoid valves are available in cast iron, cast steel and stainless steel.

To meet special request of the customers, Coolink is able to install vacuum solenoild valve as extra protection for the HVAC vacuum pump.

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