Patent ID: 8864245

Claim:
A valve device for a pneumatic brake system of a commercial vehicle, comprising: a valve housing; a pilot piston, which is axially displaceably guided in the valve housing by way of radial seals; a first working port; a second working port; a pneumatic control input; and an air bleed port, wherein the valve device is operably configured such that, in a first switched state of the valve device, control input pressurization causes the pilot piston to be held in a first end position, at which the pilot piston rests against a first valve seat, against a spring force, so that the first valve seat seals the second working port from the air bleed port, and causing the pilot piston to be lifted from a second valve seat, so that the first working port is connected to the second working port; wherein the valve device is further operably configured such that, in a second switched state of the valve device, bleeding of the pneumatic control input causes the pilot piston to be lifted from the first valve seat by the spring force, so that the first valve seat connects the second working port to the air bleed port, and causes the pilot piston to be held in a second end position, at which the pilot piston rests against the second valve seat, with the spring force, so that the second valve seat seals the first working port from the second working port; and wherein the first valve seat is displaceable in the direction of movement of the pilot piston so that the first valve seat and the pilot piston resting against the first valve seat are synchronously axially displaceable when the second working port is sealed from the air bleed port.