Usually rotary vane vacuum pump is driven by three-phase alternating current, should also pay attention to the power cord link, in order to ensure the correct direction of rotation, otherwise, the pump oil will be discharged to the vacuum chamber. Therefore, the pump should be set to reverse braking to prevent the pump reverse. The pump can not be started when the power cord is connected incorrectly. In order to prevent motor burn out, overload switch should also be set, usually temperature control switch. When you stop the pump, the pressure of the outlet air will cause the pump to reverse, causing the pump oil to overturn the vacuum chamber and the air to enter the vacuum chamber to destroy the vacuum. A special valve is therefore required to separate the pump from the vacuum chamber to prevent air and pump oil from entering the vacuum chamber. This type of protective valve, installed in the pump inlet pipe, acts to shut off the pipe that collapses between the vacuum chambers when the pump is de-energized or the control switch is open, and to deflate the pump inlet. This type of protection valve is usually a solenoid vent valve. It is connected to the motor's power supply and controls the entry of air. When the motor is de-energized, the solenoid valve is opened and the passage between the pump and the vacuum chamber is closed by the pressure difference between the atmosphere and the pump inlet. The atmosphere then enters the pump inlet. When the pump is started, the solenoid valve is closed and the pump evacuates the protection valve. The valve plate is opened by spring pressure. In a typical rotary vane pump, the air inlet valve is usually provided with an air isolation valve in the inlet of the pump, and the air passage serves as the protection valve. In this case, no electromagnetic bleed valve needs to be provided on the inlet pipe.
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