Pressure regulators with self-aligning valve disk assemblies

A pressure regulator comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• a seat positioned in the fluid passageway;
• a stem movable relative to the seat;
• and
• a disk assembly coupled to the stem, the disk assembly including:
• a disk holder defining a cavity, the disk holder including a retaining tab extending into the cavity;
• a disk cap positioned in the cavity, a first surface of the disk cap to engage a second surface of the disk holder such that the disk cap is pivotable and rotatable relative to the disk holder;
• and
• a disk positioned in the cavity and extending circumferentially around the disk cap, the disk to pivot with the disk cap to sealably engage the seat, the retaining tab to retain the disk in the cavity.

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

• a disk holder defining a cavity;
• a retainer positioned in the cavity, the retainer including a first curved surface;
• and
• a disk positioned in the cavity and extending circumferentially around the first curved surface, a second curved surface of the disk complementary to the first curved surface such that the disk is pivotable and rotatable about the first curved surface.