Pressure regulators with pivotable valve disk assemblies

A valve disk assembly for a pressure regulator, the valve disk assembly comprising:

• a disk holder, an inner surface of the disk holder defining a cavity;
• a disk positioned in the cavity, the disk pivotable with respect to the disk holder;
• an alignment ring positioned between the inner surface and the disk, the alignment ring to provide a seal between the disk and the disk holder, the disk to compress the alignment ring when the disk pivots from a neutral position with respect to the disk holder, the alignment ring to bias the disk to the neutral position;
• and
• a retainer positioned in the cavity, the disk extending circumferentially around the retainer, a first angled surface of the disk pivotable with respect to a second angled surface of the retainer.

A valve disk assembly for a pressure regulator, the valve disk assembly comprising:

• a disk holder;
• a disk positioned in the disk holder, the disk pivotable from a neutral position with respect to the disk holder;
• an O-ring positioned between the disk and the disk holder, the O-ring to bias the disk to the neutral position;
• and
• a retainer positioned in a cavity of the disk holder, the disk extending circumferentially around the retainer, a first angled surface of the disk pivotable with respect to a second angled surface of the retainer.