The valve regulates the release of the formulation and ensures accurate dosing.
Components of a Valve System
Valve Cup: Secures the valve to the container.
Gasket: Prevents leakage and ensures a tight seal.
Actuator: The part pressed by the user to release the product.
Stem: Serves as the channel for the product to travel during actuation.
Spring: Returns the valve to the closed position after use.
Valve Body: Encases the valve mechanism.
Dip Tube: Extends into the container, drawing the formulation into the valve for dispensing.
Types of Valves
Continuous Spray Valves
Allows product to flow as long as the actuator is pressed.
Common for topical sprays like hair sprays, disinfectants.
Metering Valves
Delivers a specific quantity of product per actuation.
Critical for inhalation aerosols where dose accuracy is paramount.
Foam Valves
Designed to create and expel foam. Usually paired with specific formulations that contain surfactants.
Desired Valve Properties
Good sealing to prevent leaks.
Chemical compatibility with formulation and propellant.
Consistent dose accuracy and spray characteristics over product shelf life.