To introduce a water ring vacuum pump knowledge, is why to add a check valve. As follows:
The check valve is a one-way valve. When the pump stops, the vacuum of the vacuum tube is higher than the pump chamber. The gas will enter the pump chamber from the exhaust port, and the water pressure will be transferred to the vacuum tube. Water ring vacuum pump installed check valve, mainly for protection:
1. Protection system. When the pump stops, the inlet of the vacuum pump and the connection of the system are in a vacuum state. Check valves are usually installed at the pump inlet and system connection for protection.
2, to protect the vacuum pump itself, gas backflow will impact the impeller, make the pump reverse rotation, in order to protect the pump body and other equipment, generally installed in the pump outlet check valve. More and more units now install check valves to the outlet to protect the pump and the system. If the system requirements are strict, there are two additional check valves. The check valve ACTS as a check. Due to the vacuum pump after closed the containers in a vacuum state, and the vacuum pump chamber as big as the environment pressure, because of the pressure difference, when we close the vacuum pump, vacuum pump air could be back is pumped container, if we check valve in the pipeline installation, in close vacuum pump before closing the check valve, pump chamber air wouldn't fall back to be smoked container. When the pump stops, the outlet pressure is greater than the inlet pressure. In order to prevent the water in the water ring pump from being pressed back into the vacuum system, check valves are added to the inlet. Also called check valve or one-way valve.
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