Park release valve for a trailer vehicle having a pneumatic brake system and having the following features: a) a control piston and a piston valve, b) - a connector for supply pressure, - a connector for reservoir pressure, - an outlet for venting, - a connector as pressure outlet, c) the control piston can be moved at least between three positions which are different from one another: - a release position; here, the connector for reservoir pressure is connected to the connector as pressure outlet, - a driving position; here, the connector for supply pressure is connected to the connector as pressure outlet or to the connector for reservoir pressure and to the connector as pressure outlet, - a park position; here, the connector as pressure outlet is connected to the outlet for venting, d) in the driving position, the piston valve is loaded with supply pressure and presses against the control piston in such a way that the control piston is limited in terms of its movement and cannot assume a release position, characterized by a gate valve which can be moved at least between a pressure shut-off position and a pressure passage position, a connection from the connector for supply pressure to the connector as pressure outlet being shut off in the pressure shut-off position, and preferably with a control slide for loading the gate valve in a manner which is dependent on a brake pressure which prevails at a connector for brake pressure, in such a way that the control slide moves the gate valve as far as into the pressure passage position and/or holds it there if a brake pressure above a limit value prevails at the connector for brake pressure. a) a control piston and a piston valve, b) - a connector for supply pressure, - a connector for reservoir pressure, - an outlet for venting, - a connector as pressure outlet, - a connector for supply pressure, - a connector for reservoir pressure, - an outlet for venting, - a connector as pressure outlet, c) the control piston can be moved at least between three positions which are different from one another: - a release position; here, the connector for reservoir pressure is connected to the connector as pressure outlet, - a driving position; here, the connector for supply pressure is connected to the connector as pressure outlet or to the connector for reservoir pressure and to the connector as pressure outlet, - a park position; here, the connector as pressure outlet is connected to the outlet for venting, - a release position; here, the connector for reservoir pressure is connected to the connector as pressure outlet, - a driving position; here, the connector for supply pressure is connected to the connector as pressure outlet or to the connector for reservoir pressure and to the connector as pressure outlet, - a park position; here, the connector as pressure outlet is connected to the outlet for venting, d) in the driving position, the piston valve is loaded with supply pressure and presses against the control piston in such a way that the control piston is limited in terms of its movement and cannot assume a release position, characterized by a gate valve which can be moved at least between a pressure shut-off position and a pressure passage position, a connection from the connector for supply pressure to the connector as pressure outlet being shut off in the pressure shut-off position, and preferably with a control slide for loading the gate valve in a manner which is dependent on a brake pressure which prevails at a connector for brake pressure, in such a way that the control slide moves the gate valve as far as into the pressure passage position and/or holds it there if a brake pressure above a limit value prevails at the connector for brake pressure.