For numerous products packed under pressure, the content and the propellant must be kept
separate. To meet this requirement, dual compartment packaging was developed.
Coster's BOV system consists of an aluminum or tinplate can closed by a valve on which
a flexible multilayer film bag, containing the product to be dispensed, is affixed or welded.
The propellant, liquid gas or compressed gas (nitrogen, air), is contained inside the can outside
the bag and squeezes the bag to expel the product through the valve.
All Coster BOVs guarantee a high drop resistance even with repeated drops.
Valves are available in many different versions offering varying flow rates suitable for a broad range of applications. A variety of actuators and caps are available for sprays, gels and other products.
All materials, including bag and seal, comply with FDA regulations regarding food contact. Coster maintains a DMF for its BOVs for pharmaceutical applications.
The system can be used with standard cans, so the same machines with minor adjustments can be used to fill cans equipped with either standard or BOV valves.