Check valve
AssigneeDuerr Dental AG
InventorAlfred Deubler
Life of this patent
Estimating the term…
Abstract
A check valve comprising a valve housing, which comprises an inlet, an outlet, and a valve channel. The valve channel connects the inlet to the outlet and has a valve seat. The check valve further comprises a closure part, which cooperates with the valve seat, and a tappet bearing the closure part. An end of the tappet which is remote from the closure part bears a control piston, which together with a cylinder wall defines a control chamber, which is connected a control connection. The control chamber is connected to the valve channel by means of a connection channel.
Claims13
A compressed-air supply unit comprising:
- a compressor,
- a pressure accumulator,
- a vent valve and
- a check valve comprising
- a valve housing, which has an inlet connected to the compressor, an outlet connected to the pressure accumulator and a valve channel, which comprises a valve seat and connects the inlet to the outlet,
- a closing part, which cooperates with the valve seat, and
- a tappet, which bears the closing part,
- wherein
- an end of the tappet, which is remote from the closing part, bears a control piston,
- the control piston, together with a cylinder wall, delimits a control chamber, which is connected with the vent valve via a control connection, and
- the control chamber is connected to the valve channel via a connecting channel enabling a fluid communication between the control chamber and the valve channel.
A method for operating a compressed-air supply unit, comprising the following steps:
- providing a compressor;
- providing a pressure accumulator;
- providing a vent valve;
- providing a check valve which comprises:
- a valve housing, which has an inlet connected to the compressor, an outlet connected to the pressure accumulator and a valve channel, which comprises a valve seat and connects the inlet to the outlet,
- a closing part, which cooperates with the valve seat, and
- a tappet, which bears the closing part,
- wherein
- an end of the tappet which is remote from the closing part bears a control piston,
- the control piston, together with a cylinder wall, delimits a control chamber, which is connected with the vent valve via a control connection, and
- the control chamber is connected to the valve channel via a connecting channel enabling a fluid communication between the control chamber and the valve channel;
- and,
- providing a manometric switch, which controls the compressor and the vent valve;
- closing the vent valve when a pressure in the pressure accumulator falls below a minimum pressure and activating the compressor, so that via the connecting channel a pressure builds up in the control chamber of the check valve, which pressure opens the check valve towards the pressure accumulator;
- opening the vent valve and deactivating the compressor when a desired pressure in the pressure accumulator is reached, so that the pressure in the control chamber of the check valve drops, whereby the check valve is closed.
Dependencies are inferred from the claim text.