Mostly they don't. In order to ensure there is no delay in building up pressure for the next spray requirement and to lighten and cheapen the design, the motor is kept running to keep maximum pressure in the line and surplus pressure is recirculated through the pump after being ejected through the unloader or regulator valve.
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Mostly they don't.
In order to ensure there is no delay in building up pressure for the next spray requirement and to lighten and cheapen the design, the motor is kept running to keep maximum pressure in the line and surplus pressure is recirculated through the pump after being ejected through the unloader or regulator valve.