Pilot operated diaphragm fill valve and assembly for reducing hydrostatic shock

An apparatus, comprising:

• a water supply tube;
• a valve seat structure disposed atop the water supply tube and including a bridge recess portion, wherein the valve seat structure further comprises:
• a substantially circular inner valve seat portion;
• a substantially circular outer valve seat portion concentrically disposed about the circular inner valve seat portion;
• a plurality of lands extending outwardly from the inner valve seat portion to the outer valve seat structure;
• and
• a plurality of spoke openings disposed between adjacent lands of the plurality of lands;
• a bridge disposed within the bridge recess portion of the valve seat structure;
• and
• a main diaphragm valve disposed above the bridge.

An assembly, comprising:

• a cylindrical water supply tube structure, the cylindrical water supply tube structure further comprising:
• a cylindrical water supply tube;
• a valve seat structure disposed atop the cylindrical water supply tube and comprising:
• a circular inner valve seat portion;
• and
• an outer valve seat portion;
• a bridge disposed in the center of the valve seat structure about the inner valve seat portion, wherein:
• the bridge comprises a washer-like structure;
• and
• the bridge is one of a disk or a tape structure;
• and
• a main diaphragm valve disposed atop the valve seat structure such that the bridge is disposed between the valve seat structure and the main diaphragm valve.