Patent ID: 6936091

Claim:
A method of handling a fluid in a gas purification system including a plurality of vessels selectively connected to apertures of a first valve element, comprising the steps of: (i) positioning said first valve element in a first position to remove a product fluid from a first port opening of a first one of said plurality of vessels; (ii) moving said first valve element by intermittent rotation to a second position to depressurize said first vessel in a first direction; (iii) moving said first valve element by intermittent rotation to a third position to depressurize said first vessel in a second direction, said second direction being directly opposite to said first direction; (iv) moving said first valve element by intermittent rotation to a fourth position to purge impurities from said first vessel; and (v) moving said first valve element by intermittent rotation to a fifth position to repressurize said first vessel.