What are the precautions for metering pump maintenance
1. How to adjust the pressure of the safety valve of the metering pump? The pressure of the safety valve of the metering pump can be changed within the rated working pressure area of the metering pump, and it is not allowed to exceed the maximum working pressure of the metering pump. The safety valve of the metering pump is designed to prevent the metering pump from operating under overpressure. For example, if the maximum working pressure of the metering pump is 3bar, the pressure of the safety valve can be changed to 3bar or lower to ensure the normal operation of the metering pump. The overpressure of the metering pump is one of the key reasons for the damage of the metering pump.
2. If the liquid delivered by the metering pump is not water, how to calculate the suction height? Divide the rated suction height of the metering pump by the specific gravity of the metered liquid.
3. Under what circumstances does the metering pump use self-filling suction? Self-filling suction can be used under the following conditions:
(1) The measured liquid is easy to volatilize;
(2) The specific gravity of the metered liquid is relatively large;
(3) When a higher stroke frequency is required;
(4) When the metering pump is working in high altitude areas;
(5) Larger storage tanks are required for field application, and the self-priming of the metering pump is not feasible.
4. What influencing factors need to be considered when the metering pump is measuring liquid at the pump head? The key considerations are the viscosity, specific gravity, vapor pressure and temperature of the liquid.
