Patent ID: 7677269

Claim:
A gravity-controlled constant-pressure and pressure-regulation device comprising a canister, a weight block, and a seal head, the canister comprising a metal layer, an epoxy resin layer, and a plastic sheet layer, the metal layer serving as an inner lining, the epoxy resin layer surrounding an outer circumference of the metal layer, the plastic sheet layer surrounding an outer circumference of the epoxy resin layer, the weight block being movably received in the canister, the canister forming an air inlet and an air outlet, the metal layer having an inner surface movably and receivingly engages the seal head and the weight block being mounted to the seal head, the seal head being provided with sealing rings to seal between the seal head and the inner surface of the metal layer to prevent air leakage, wherein the weight block is movable upward and downward inside the canister by being acted upon by a gravity force of weight thereof and a lifting force induced by pressure inside the canister to effect mass storage of air inside the canister and stable supply air at constant pressure.