Metered Dose Dispensing Valves

A metered-dose valve is engineered to release exactly the same amount of product every time it is actuated, regardless of how hard or long it is pressed. A small metering chamber inside the valve fills with a fixed volume between actuations and discharges just that volume when triggered — so a metered-dose inhaler delivers a precise drug dose, and a metered spray dispenses a consistent shot.

This dose accuracy is what separates a metered valve from an ordinary continuous spray, and it is critical wherever the amount delivered matters — above all in pharmaceutical inhalation and nasal/oral drug delivery.

Metered-dose inhalers (MDIs), nasal and oral metered sprays, pharmaceutical aerosols, precise topical sprays, breath fresheners, technical and dosing aerosols, and veterinary metered sprays — anywhere a calibrated, repeatable dose is required.

A valve body with a defined metering chamber, elastomer seals and a stem, crimped via a ferrule to a standard aerosol can or metered vial neck and topped by an actuator. The chamber volume sets the dose (commonly tens of microlitres for inhalers). Pharma-grade valves use controlled, low-extractable materials for drug contact and inhalation.

Metered valves are part of a validated system with the container, propellant/formulation and actuator; dose accuracy, spray pattern and through-life consistency are characterized, and priming and shaking instructions are part of the directions. Seal and elastomer compatibility with the propellant and drug are confirmed, and pharmaceutical valves meet the relevant regulatory and material requirements.

Metered valves are precision-assembled from molded and machined parts plus elastomer seals and a metering chamber, then function-tested for dose accuracy and seal integrity. Chamber volume consistency, leak-tightness and (for pharma) material compliance are the critical controls; the valve is matched to the container, propellant and actuator.