The new water well drilling rig is different from the old model in the way of controlling the water pump.
Older models: A three-way switch is required to control the flow of circulating water. The air in the water pump must be evacuated before starting the diesel engine (the water pump is prohibited from idling without water). After the diesel engine is started, the water pump is always in working condition.
New model: There is no need for a three-way switch. The power of the water pump is controlled by the hydraulic operating handle. The water pump can be vented after the diesel engine is started or before the diesel engine is started. The switch of the water pump can operate the hydraulic handle at any time as needed.
The new model can control the flow direction of circulating water through the three-way switch according to the old model, and can also control the power of the water pump through the hydraulic operating handle.
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