Quick Service Limiting Valve

A quick service limiting valve comprising:

• a housing defining an interior chamber, a brake pipe passageway, and a brake cylinder passageway;
• a valve member received within the interior chamber of the housing, the valve member comprising a body, a first seal, a second seal, and a valve spring, the body of the valve member defining a valve passageway, the valve member having a first position where the valve passageway allows fluid communication between the brake pipe passageway and the brake cylinder passageway and a second position where the brake pipe passageway is isolated from the brake cylinder passageway, the valve spring biasing the valve member to the second position;
• a follower assembly received within the interior chamber of the housing, the follower assembly comprising a body, a first check valve, a second check valve, a diaphragm, and a follower spring, the diaphragm having a first side in fluid communication with the brake cylinder passageway and a second side in fluid communication with a reference chamber, the first check valve having a first position where the brake cylinder passage is in fluid communication with the reference chamber and a second position where the brake cylinder passage is isolated from the reference chamber, the second check valve having a first position where the reference chamber is in fluid communication with the brake cylinder passageway and a second position where the reference chamber is isolated from the brake cylinder passageway, the follower spring biasing the valve member toward the first position,
• wherein the valve member is configured to move between the first position and the second position based on a pressure differential between a pressure of the brake cylinder passage and a pressure of the reference chamber.