Fluid valve, particularly return valve for a painting system

摘要

Exemplary illustrations of a fluid valve, e.g., a return valve for returning residual paint, rinsing agent, and compressed air from a paint line when changing color in a painting system, are disclosed. An exemplary fluid valve may be adjusted between an open position, in which the fluid valve is at least partially open, e.g., for rinsing a paint line with a rinsing agent and for pressurizing the paint line with a new color for the color change, and a closed position, in which the fluid valve is closed, e.g., for applying the new color after the color change. An exemplary fluid valve may switch to the closed position, upon actuation by the medium thereof, e.g., medium flowing through or present in the valve. In another example, a fluid valve may close depending on the fluid present at the input side.

主权项

1. A fluid valve with an opening position in which the fluid valve is at least partially open, and a closing position in which the fluid valve is closed, wherein the fluid valve is adjustable between the opening position and the closing position, wherein the fluid valve is configured to be actuated by its own medium, wherein the fluid valve is configured to switch to the closing position in response to a fluid present on the inlet side, and wherein the fluid valve is also controllable externally by a valve drive, the fluid valve comprising:
a first control input in the form of a first control air connection, over which the fluid valve can be externally actuated into the closing position; a second control input in the form of a second control air connection, over which the fluid valve can be externally actuated into the opening position; a cylinder; a piston which is movable within the cylinder; a shut-off body which is moved by the piston between the opening position and the closing position; a valve seat, wherein the shut-off body closes the valve seat in the closing position and the shut-off body opens the valve seat in the opening position; the shut-off body is coupled with the piston by a compensation element; the compensation element allows a play between the shut-off body and the piston; and the play of the compensation element is larger than the movement of the shut-off body from the opening position into the closing position so that the shut-off body is moveable from the opening position into the closing position without movement of the piston.