US 12,343,578 B2
System for maintaining integrity of a dry pipe system with heated cabinet and flow restrictor valve
Bentley F. Gleeson, Plymouth Meeting, PA (US); Michael B. Ferrucci, Mont Clare, PA (US); George J. Mchugh, IV, Malvern, PA (US); and James P. Mchugh, Newtown Square, PA (US)
Assigned to AGF MANUFACTURING, INC., Malvern, PA (US)
Filed by AGF Manufacturing, Inc., Malvern, PA (US)
Filed on Nov. 30, 2022, as Appl. No. 18/071,745.
Application 18/071,745 is a division of application No. 16/884,281, filed on May 27, 2020, granted, now 11,541,261.
Prior Publication US 2023/0088239 A1, Mar. 23, 2023
Int. Cl. F16K 17/34 (2006.01); A62C 35/62 (2006.01); A62C 35/68 (2006.01); F16K 17/26 (2006.01)
CPC A62C 35/68 (2013.01) [A62C 35/62 (2013.01); F16K 17/26 (2013.01); F16K 17/34 (2013.01); F16K 2200/303 (2021.08); F16K 2200/401 (2021.08); F16K 2200/402 (2021.08); Y10T 137/7848 (2015.04); Y10T 137/7869 (2015.04)] 5 Claims
OG exemplary drawing
 
1. 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.