The three screw pump can be reversed.The design of a three screw pump allows it to reverse under specific conditions. The possibility of reversal mainly depends on the usage environment of the pump and the needs of the user. Under normal circumstances, a three screw pump has a fixed direction of rotation and should not be reversed, as this may cause the thrust balance device to fail and damage the pump. However, if the user has a need for reversal, they can explain to the manufacturer, and the manufacturer can customize a screw pump that can be reversed according to the user's needs. In this case, not only does the rotation direction of the screw pump need to be specially designed, but the installation direction of the safety valve will also change, and the mechanical seal also needs to be specially designed. 12
The reverse rotation of a three screw pump usually occurs in the following situations:
The rotation direction of the driver is reversed, especially in the electric motor, which requires checking the rotation direction by tapping the motor before the first start-up. 1
The output pipeline is not equipped with a one-way valve (check valve), causing the pump to reverse due to oil reflux in the pipeline after the pump is stopped.
There is no one-way valve or gate valve installed at the outlet between two parallel pumps. When one pump is running, oil flows to the outlet of the other pump, causing it to reverse.
In the case of reverse rotation, the suction and discharge directions of the three screw pump will also be opposite. Therefore, if a reverse operation is required, it is necessary to ensure that all relevant safety measures and equipment customization are handled correctly
