Valves

• The valves regulate the release of the formulation and ensures accurate dosing.

Components of a Valve System:

1. Valve Cup: Secures the valve to the container.
2. Gasket: Prevents leakage and ensures a tight seal.
3. Actuator: The part pressed by the user to release the product.
4. Stem: Serves as the channel for the product to travel during actuation.
5. Spring: Returns the valve to the closed position after use.
6. Valve Body: Encases the valve mechanism.
7. Dip Tube: Extends into the container, drawing the formulation into the valve for dispensing.

Types of Valves:

1. Continuous Spray Valves

   • Allows product to flow as long as the actuator is pressed.
   • Common for topical sprays like hair sprays, disinfectants.

2. Metering Valves

   • Delivers a specific quantity of product per actuation.
   • Critical for inhalation aerosols where dose accuracy is paramount.

3. Foam Valve

   • 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.

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