Before installing a sealless self-priming pump, check for loose fasteners and foreign objects blocking the pump flow path to prevent damage to the impeller and pump body during operation. During installation, avoid adding weight to the pump pipes to prevent deformation. Tighten the anchor bolts during installation to prevent excessive vibration during startup, which could affect the pump's performance. For ease of maintenance and safety, install a regulating valve on each pump's inlet and outlet pipes and a pressure gauge at the pump outlet to ensure operation within the specified head and flow range, extending the pump's lifespan. After installation, rotate the pump shaft. The impeller should not rub or seize. If not, disassemble the pump and investigate the cause.

Starting and stopping a sealless self-priming pump requires preparation before starting. Check that the motor is rotating correctly (clockwise when viewed from the top of the motor toward the pump). Keep the test run short to avoid dry wear damage to the mechanical seal. Open the exhaust valve to allow the liquid to fill the entire pump body. Once full, close the exhaust valve. Check that all components are functioning properly. Manually crank the pump to allow lubricant to reach the mechanical seal end face. Start by fully opening the inlet valve. Close the outlet valve. Start the motor and observe whether the pump is operating correctly. Adjust the outlet valve opening to the desired operating conditions. If the user has installed a flow meter or pressure gauge at the pump outlet, adjust the outlet valve opening so that the pump operates at the specified point listed in the performance parameter table. After adjusting the outlet valve opening, measure the pump motor current and ensure that the motor operates within the specified current. Otherwise, the pump will overload and burn out. Adjusting the outlet valve opening depends on the pipeline conditions.

If a sealless self-priming pump does not produce water after starting, this may be due to air in the pump or air accumulation in the water inlet pipe; the bottom valve is not tightly closed, causing incomplete water filling; the vacuum pump packing is severely leaking; or the gate valve or snap valve is not tightly closed. We need to remove debris, replace damaged rubber pads, change the direction of the valve disc; tighten or replace new packing, close the gate valve or buckle the door; increase the water volume until there are no bubbles at the bleed screw plug; replace cracked pipe water; reduce the head and press the nozzle of the self-priming pump into the water 0.5 meters.