Check Valve Technology

Dielectrics has developed and patented check valve technologies for use in RF welded flexible-film bladders. Because they are RF welded in, they become an integral part of the product and do not have problems associated with parts that are glued or mechanically held in place. They are infinitely variable. You can choose from our "standard" types, or we can provide customized parts to suit your particular application.

Two main types are most commonly employed:

Flat check valves are primarily used in a bladder or air-cell, both as a port to introduce air or fluids into a bladder, and as a check to prevent them from escaping once they have been introduced.

Inlet check valves are more often used in pumps. Internal air or fluid pressure from squeezing the pump closes the inlet valve and the air/fluid is forced through the flat check valve into the bladder. While the pump is returning to its original shape, a vacuum is created, opening the inlet valve and drawing outside air/fluid in for the next cycle.

(See ANIMATION)