How is the flow control mechanism of the foam spray trigger designed

As an important tool in the cleaning, disinfection and beauty industries, the key to the performance of the foam spray trigger lies in the quality of the foam during spraying and the flow control of the spray liquid. The flow control mechanism is the core part to ensure the stability and efficiency of the foam spray trigger spray.

Design principle of flow control mechanism
The flow control of the foam spray trigger mainly depends on the combination of mechanical structure and liquid dynamics. Its core goal is to ensure uniform and delicate foam and stable and continuous spraying process by accurately adjusting the spray volume. The size of the spray flow directly determines the foam concentration, spray distance and user experience.
The flow control design is based on the reasonable matching of the spray pressure, valve opening and pipeline resistance to achieve controllable output of the spray volume. The spray liquid enters the nozzle from the liquid storage bottle through the straw, and the flow is controlled by the piston drive and valve system to form an ideal foam.

Structural composition of flow control
The flow control system mainly consists of the following parts:
Piston and spring mechanism
The trigger trigger drives the piston to reciprocate in the pump body to form the power of liquid suction and discharge. The spring provides the reset force to ensure the piston returns to its position and ensures stable liquid delivery for each trigger.
Inlet valve and outlet valve
The inlet valve ensures that the liquid is sucked from the liquid storage bottle into the pump body, and the outlet valve controls the liquid to be sprayed out of the nozzle from the pump body. These two valves cooperate with the piston movement to achieve one-way flow and prevent liquid backflow and leakage.
Flow regulating valve
Generally set inside the nozzle or at the connection, allowing the user to adjust the valve opening to change the spray flow rate. The structure can be knob-type, push-pull type or sliding type, which directly affects the spray flow rate.
Foam mixing chamber
At the end of the flow control, the spray liquid is mixed with air to form foam. The structural design of the mixing chamber affects the ratio of air to liquid, and indirectly determines the balance between flow and foam quality.

Detailed description of flow regulation method
Common flow regulation methods for foam spray triggers include mechanical adjustment and structural optimization.
Mechanical adjustment method
The user changes the opening of the nozzle valve by rotating the adjustment ring or trigger angle at the front end of the nozzle. The larger the opening, the greater the flow rate and the more foam sprayed. Conversely, the smaller the opening, the lower the spray flow rate and the finer the foam. The mechanical adjustment method is simple to operate and has strong applicability.
Structural optimization method
During the design stage, the volume of liquid pumped out per unit time is controlled by optimizing the diameter of the suction tube, the volume of the pump chamber and the piston stroke. The structural parameters are repeatedly calculated and adjusted experimentally to achieve the ideal flow range. Structural optimization improves the overall performance and stability of the spray trigger and reduces human adjustment errors.

Key factors affecting flow control
Liquid viscosity
High-viscosity liquids have large flow resistance and relatively reduced flow. The flow control design needs to consider the viscosity range of the applicable liquid and adjust the pump body pressure and valve sensitivity.
Spring stiffness and piston size
Spring stiffness directly affects the piston return speed, which in turn affects the pump suction and discharge efficiency. The piston size determines the volume of liquid sucked and discharged each time. The larger the size, the greater the flow.
Valve sealing performance
Poor valve sealing causes liquid reflux or leakage, and unstable flow. High-quality valve materials and precision processing ensure the sealing of the spray trigger.
Air mixing ratio
The quality of the foam is affected by the mixing ratio of air and liquid. Too much air will reduce the liquid flow, and vice versa, the foam density is insufficient. The mixing chamber design needs to reasonably match the flow control parameters.