Patent ID: 9266516
Filing Date: 2016-02-23
CPC Classification: B60T,Y10T

Claim Text:
1. A brake cylinder maintaining valve for maintaining brake cylinder pressure in freight car brake equipment, comprising: a first valve including a diaphragm with a brake pipe pressure on an upper surface thereof and an auxiliary reservoir pressure on a lower surface thereof; a first check valve coupled to said first valve and having auxiliary reserve and atmospheric pressures on opposing surfaces thereof; a second valve including a diaphragm with a first brake cylinder pressure on an upper surface thereof and a second brake cylinder pressure on a lower surface thereof; a second check valve coupled to said second valve and having the second brake cylinder pressure and the brake pipe pressure on opposing surfaces thereof; and wherein the second check valve provides the brake pipe pressure through a choke to replenish the second brake cylinder pressure if the second brake cylinder pressure is below an original set pressure represented by the first brake cylinder pressure.