Manually press the pressure handle downwards, the volum […]
Manually press the pressure handle downwards, the volume in the spring cavity decreases, and the pressure rises. The liquid enters the nozzle cavity through the hole of the valve core, and then sprays the liquid out through the nozzle. At this time, loosen the pressure handle and the pressure in the spring cavity The volume increases and negative pressure is formed. The sphere opens under the action of negative pressure, and the liquid in the bottle enters the spring cavity. At this time, there is already a certain amount of liquid in the valve body. When the handle is pressed again, the liquid stored in the valve body will be Punch upwards and spray out through the nozzle.
From the above working principle, the key to a good pump head is to pay special attention to the following places: 1. The glass ball or steel ball under the spring. The seal here is very important. It is related to the upward rush of the liquid in the spring cavity. If it leaks here, when the pressure handle is pressed, some of the liquid will leak into the bottle and affect the effect of the liquid spray; 2. It is the sealing ring at the upper end of the valve body. If there is leakage here, when the pressure handle is released When the liquid is pumped upward, the bottom of the force is reduced, resulting in a small amount of liquid stored in the valve body, which will also affect the spray effect; 3. The fit between the pressure handle and the valve core. If the fit here is loose and leaks, When the liquid rushes up to the nozzle, there will be a certain resistance, the liquid will flow back, and if it leaks here, it will also affect the spray effect; 4. The design of the nozzle, the design of the nozzle is directly related to the spray effect, see details The nozzle design issues are explained in detail on the next page.
Therefore, the function of the general pump head is to detect these four positions, and other appearance and coordination problems are tested according to the routine.