System for maintaining integrity of a dry pipe system with heated cabinet and flow restrictor valve

A flow restrictor valve, the flow restrictor valve comprising:

• a plunger;
• a compression spring;
• a retaining member configured to house the plunger and the compression spring;
• and
• an accelerator disposed upstream of the plunger and having an upstream diameter that is greater than a downstream diameter to accelerate a flow of liquid or gas toward the plunger, and
• a retaining ring located on an inner surface of the flow restrictor valve and upstream with respect to the plunger, compression spring, and accelerator, wherein said retaining ring is configured to retain at least the plunger, the compression spring and the accelerator within the flow restrictor valve
• wherein the retaining member includes an inner annular side wall and a base portion having a plurality of openings and configured to retain the compression spring, said base portion of the retaining member including an inner annular protrusion that extends upward from the base portion and provides a platform for the compression spring to be compressed in a downstream direction,
• wherein the plunger is configured to be held in
• (i) an open position by the compression spring, the open position enabling a liquid or gas to flow through the flow restrictor valve, and
• (ii) a closed position in which a flow of the liquid or gas generates a velocity sufficient to cause the compression spring to compress and engage an outer edge of the plunger with a seat of the retaining member to prevent the flow of the liquid or gas through the flow restrictor valve.