Self-aligning axially constrained regulator valve assembly

A regulator valve assembly for regulating pressure of gas flowing through a gas flow pressure regulator, the regulator valve assembly comprising:

• a valve seat;
• and
• a valve moveable between an open and a closed position relative to the valve seat;
• wherein the valve comprises a valve disc having a sealing portion constituting a sealing surface of the valve disc, which contacts the valve seat when the valve is in the closed position;
• wherein the valve disc includes a plurality of spiral arms extending outwardly from the sealing portion in a continuous and gradually widening curve around an axial direction, the plurality of spiral arms having end portions that are movable relative to each other when the valve disc is in an uninstalled state;
• wherein the plurality of spiral arms form a flexible portion which is moveable upward and downward in the axial direction to open and close the valve, the plurality of spiral arms being displaceable relative to each other and configured to self-align the valve disc within the valve seat and to axially constrain the motion of the valve disc to motion along the axial direction;
• and
• wherein the plurality of spiral arms form an edge portion which provides for securing the valve disc in an installed state, the edge portion including the end portion on each of the spiral arms, wherein the end portions are fixed to the valve seat to axially constrain the upward and downward movement of the flexible portion, the end portions being displaced from the sealing portion in the axial direction, and being displaced in the axial direction relative to each other, so as to bias the sealing portion in the axial upward direction for sealing the valve.