How to improve the self suction performance of self priming sewage pump?

The first one: the suction end of the valve is installed at the end of self-priming sewage pump suction pipe.
Suction end of the valve is actually a check valve, it can only guarantee the flow by the pool into the suction tube can not turn the clock back, so if the suction pipe full of water, despite the elevation axis pump the water level above the pool, but because the end suction the role of valve, suction tube into the pool water will not enable the suction tube has been filled with water to ensure the pump can automatically and quickly start. The reliability of this method by absorbing effect, the quality of the suction end of the valve is not tightly closed, for example, Water Leakage, suction tube will gradually shed the water pool, a long time, no water suction pipe, leading to still need artificial irrigation pump start.
Second: self priming sewage pump to reduce the water inlet pipe curve, height and horizontal distance.
Third: self priming sewage pump set before the pump suction tank.
This way is needed in a suction tank set the pump suction pipe, water pump in the first operation, artificial internal tank filled with water, the first time after stopping operation, because the water suction tank pipe tube is higher than the height of the water height, although the pool water level is lower than the tank water level, water tank can't go back, into the pool, so the water absorption can be stored, and because the water tank outlet pipe (i.e. pump suction pipe) tube height is lower than the height of the water, so it can ensure the pump suction tube filled with water, and then after the pump is running, the water tank is pumped away, there is negative pressure the tank, the water in the pool under the action of atmospheric pressure added to the water tank through the suction tank inside the pool
Fourth: self priming sewage pump pump water pump in the pump, pump start before the pump starts, the vacuum pump to start, so that the first water filled with water pump, to ensure that the pump automatically, quickly start. This way of water absorption requires a sound automatic control system to ensure the normal operation of the system.