Starting of pneumatic diaphragm pump:
1、 Connect the pump to the accessories according to the installation instructions in section three (1) of this manual, and place the pump flat and tighten the foundation. Special reminder: For diaphragm pumps with non-metallic wire connections such as plastic series, please do not forcefully tighten the connecting pipes to avoid causing the plastic pipes of the water pump to rupture. (It is recommended to add clamps to the inlet and outlet pipes of the water pump before connecting the pipes.).
2、 Open the inlet and outlet pipeline valves and ensure that the inlet pipeline is submerged in the medium.
3、 After setting the pressure regulating switch of the air triple component to a low supply pressure, add lubricating oil to the oil mist cup (usually the right cup of the air triple component is the oil mist cup) and connect the air source.
4、 Slowly increase the pressure regulating switch until the water pump reaches the actual required flow rate and head, then lock the pressure regulating switch.
5、 Observe the water pump for about 5 minutes. If there are no abnormalities, it can continue to be used.
Shutdown of pneumatic diaphragm pump:
1、 Before stopping the pump operation, please rotate the pressure regulating valve at the triple joint to lower the air pressure.
2、 After disconnecting the inlet pipe of the pump from the medium, allow the pump to continue working for 2-3 minutes to drain the liquid inside the pump.
3、 Close the inlet and outlet valves to prevent medium backflow; And turn off the gas source.
4、 Immerse the inlet pipe in clean water or detergent, switch the inlet and outlet tees, and turn on the low-pressure air source to clean for 3-5 minutes.
5、 Drain the clean water from the pump, close the inlet and outlet valves and the air source switch.
The diaphragm pump instrument air and lubricating oil pressure are interlocked with the main motor. The injection and drainage valves of the propulsion fluid are pneumatic valves. They should always maintain the corresponding air pressure. The small working pressure of the two valves is not less than 0.4 megapascals, so even after stopping the pump, the instrument air pressure is generally maintained above 0.15 megapascals. To avoid insufficient or excessive liquid in the chamber, the air supplied to the valve is filtered and the oil is atomized. When the diaphragm pump is running, the lubricating oil pressure should not be lower than the pressure interlock value (0115MPa), the pressure difference between the lubricating oil inlet and outlet filters should not be too large, the steel ball in the lubricating oil flow sight should be at the upper limit position, and the adjustment range E should not be too large when adjusting the flow rate to avoid the instantaneous flow rate being too fast and causing chain tripping. By improving the above process and mastering the key operating points, the diaphragm pump always has a stable process environment during operation. In the past year, due to electrical reasons, it only jumped once, thus achieving long-term operation.
The flow characteristics of a diaphragm pump refer to the relationship between the relative flow rate of the medium through the valve and the displacement (relative opening of the valve). The ideal flow characteristics mainly include four types: straight line, equal percentage (logarithmic), parabolic, and fast opening. The characteristic curve and shape of the valve core, commonly used ideal flow characteristics include straight line, equal percentage (logarithmic), and quick opening. By selecting the flow characteristics of a diaphragm pump, the shape and structure of the valve core can be determined based on its flow characteristics. However, for diaphragm valves and butterfly valves, due to their structural characteristics, it is impossible to achieve the required flow characteristics by changing the surface shape of the valve core. At this point, it can be achieved by changing the feedback cam shape of the valve helicometer.
