Valve assembly and pressure control method

An anti-lock braking system for a vehicle brake, comprising:

• a valve assembly for providing pressure control at an output port, wherein the output port is connectable to a brake cylinder of a brake of the vehicle, and wherein the valve assembly includes:
• an input port and the output port;
• a pressure sink;
• a first valve, including a first membrane and a first control connection;
• a second valve, including a second membrane and a second control connection, wherein the first valve and the second valve are arranged in series between the input port and the pressure sink and between which the output port branches off;
• a first control valve to connect the first control connection to the input port or vents the first control connection to the pressure sink in a controllable manner;
• and
• a second control valve to connect the second control connection to the output port or vents the second control connection to the pressure sink in a controllable manner;
• wherein a control pressure line connects the output port to the second control valve, so that a control pressure at the second control input is provided from the output port,
• wherein the pressure sink has at least one opening to an environment or at least one area having a reduced pressure,
• wherein the first membrane and the second membrane are oriented perpendicularly to each other, and
• wherein the first control valve and the second control valve are oriented parallel to each other and are oriented in opposite directions.

A commercial vehicle, comprising:

• a valve assembly, including:
• an input port and an output port;
• a pressure sink;
• a first valve, including a first membrane and a first control connection;
• a second valve, including a second membrane and a second control connection, wherein the first valve and the second valve are arranged in series between the input port and the pressure sink and between which the output port branches off;
• a first control valve to connect the first control connection to the input port or vents the first control connection to the pressure sink in a controllable manner;
• and
• a second control valve to connect the second control connection to the output port or vents the second control connection to the pressure sink in a controllable manner;
• wherein a control pressure line connects the output port to the second control valve, so that a control pressure at the second control input is provided from the output port,
• wherein the pressure sink has at least one opening to an environment or at least one area having a reduced pressure,
• wherein the first membrane and the second membrane are oriented perpendicularly to each other, and
• wherein the first control valve and the second control valve are oriented parallel to each other and are oriented in opposite directions;
• and
• an anti-lock braking system, including the valve assembly, for providing pressure control at the output port, wherein the output port is connectable to a brake cylinder of a brake of the vehicle.

A method for controlling a pressure at an output port by a valve assembly, the method comprising:

• feeding a pressure via the input port through a first valve to an output port;
• closing the first valve to maintain the pressure at the output port;
• connecting the output port to a pressure sink through a second valve to lower the pressure at the output port;
• and
• interrupting the connection of the output port to the pressure sink by controlling the second valve with the pressure at the output port;
• wherein the valve assembly includes:
• the input port and the output port;
• the pressure sink;
• the first valve, including a first membrane and a first control connection;
• a second valve, including a second membrane and a second control connection, wherein the first valve and the second valve are arranged in series between the input port and the pressure sink and between which the output port branches off;
• the first control valve to connect the first control connection to the input port or vents the first control connection to the pressure sink in a controllable manner;
• and
• the second control valve to connect the second control connection to the output port or vents second first control connection to the pressure sink in a controllable manner;
• wherein a control pressure line connects the output port to the second control valve, so that a control pressure at the second control input is provided from the output port,
• wherein the pressure sink has at least one opening to an environment or at least one area having a reduced pressure,
• wherein the first membrane and the second membrane are oriented perpendicularly to each other, and
• wherein the first control valve and the second control valve are oriented parallel to each other and are oriented in opposite directions.