Vacuum Differential Pressure Gas Valve is a valve installed on a mechanical vacuum pump, primarily used to prevent oil backflow and contaminate the vacuum system. The valve closes automatically by relying on the pressure difference between the atmosphere and vacuum, maintaining the vacuum level of the system and, if necessary, fills the pump chamber with atmosphere to prevent oil backflow.

Operating Principle

When the mechanical vacuum pump stops operating or the power supply is suddenly interrupted, the vacuum electromagnetic pressure difference filling valve uses the pressure difference force between the atmosphere and vacuum to automatically close the valve plate, sealing the vacuum system and maintaining its vacuum level. At the same time, the valve fills the pump cavity with atmospheric air through a throttle hole to prevent oil backflow and contamination of the vacuum system. When the solenoid valve is energized, the pilot valve shuts off the atmosphere, the vacuum pump evacuates air, and the valve plate automatically opens, allowing the vacuum system to operate normally.

Application Scope and Performance Parameters

‌Application Range: Typically applicable to pressure ranges from 10^-5 Pa to 10^-3 Pa.‌

Medium Temperature: Generally between -25℃ and +80℃.

Power Voltage: Typically 220V/50Hz.

Switching Time: Typically less than 3 seconds.

Installation Method: Vertical installation.

DYC-Q series: Applicable range from 10^-5 Pa to 10^-2 Pa, medium temperature from -25℃ to +40℃, switching time less than 3 seconds.