Manual press press down the handle, spring in the cavity volume decreases, and the pressure increases, the liquid valve core hole into the nozzle cavity, repass outward nozzle liquid, then loosen the pressing handle, spring in the cavity volume increase, form the negative pressure, sphere under negative pressure is open, bottles of liquid into the spring chamber, then has good must be fluid in the body, when to press the handle is stored in the body of the liquid will be washed up, through the nozzle to spray;
A good pump head is key in the following places to pay special attention to:
1, under the spring of the glass or steel ball, the seal here is very important, related to the spring cavity liquid upward thrust force, if the leakage here when pressing the handle when the liquid will have a part of the leakage into the bottle and affect the effect of liquid to spray;
2. It is the sealing ring at the upper end of the valve body. If there is a leak, when the pressure handle is released, the force of liquid upward pumping will decrease, resulting in a small amount of liquid stored in the valve body, which will also affect the spray effect.
3, the pressure handle and the valve core of the cooperation, if the cooperation is loose, there will be a certain resistance when the liquid rushed up to the nozzle, the liquid will flow back, if the leakage will affect the spray effect;
4. The design of the nozzle. The design of the nozzle is directly related to the spray effect.
