Oil seal mechanical vacuum pump to open a small hole above the compression chamber and install the regulator valve, when the regulator is opened and adjust the intake air volume, the rotor to a certain position, the air will be through this hole into the compression chamber in order to To reduce the compression ratio so that most of the steam will not condense and will be excluded from the pump with the incoming gas. The valve that plays a role is called a gas ballast valve. Gas valve in English called: Gasballast Valve This article Keyword search: more pump valve product information Usb Mini Fan,Usb Desk Fan,Usb Cooling Fan,Usb Powered Mini Fan Foshan Windfeel Electrical Appliances CO., LTD , https://www.windfeel.cn
Gas ballast valve can speed up the extraction of steam without polluting the oil. If the vacuum pump only pulls out the permanent gas, the gas does not liquefy because of the increase of the pressure, it does not matter the deterioration of the pump oil. But if you want to use this pump to do vacuum drying or to take out damp air, then there is not only permanent gas but also water vapor in the gas. If this part of the water vapor is extracted by the pump without gas ballast, the steam will Due to liquefaction and dissolved in the oil, the vacuum nature of oil will deteriorate, thus reducing the pumping speed and vacuum pump.