Pneumatically controlled drain valve

Abstract

The invention relates to a drain valve for a cooler of a compressor, with a pressure chamber which can be connected to the inner chamber of the cooler by means of a connection opening, and an outlet for removing a condensate. The valve according to the invention comprises a pneumatic switching device and a non-return valve which are operatively connected to the pressure chamber, with an operativeconnection between the switching device and the non-return valve by means of which the non-return valve can be switched to an open position by the switching device. During the idle operation of the compressor, the non-return valve can be switched by means of the switching device into an open position such that condensate from the connection opening can be removed through the outlet via the non-return valve.

Description

technical field [0001] The invention relates to a drain valve for a cooler of a compressor, comprising a pressure chamber connectable to the inner space of the cooler via a connection port and a drain for draining condensate. The valve has a pneumatic switching device and a non-return valve, which are operatively connected to the pressure chamber. Background technique [0002] Pneumatically controlled drain valves are known in the prior art, as exemplified in figure 1 as shown in the position of use. In this valve, a gas shield is pressed downwards against the force of a spring during compressor operation, thereby opening an inlet valve arranged approximately centrally in the drain valve so that compressed air and condensate can flow into the chamber below the membrane. In the bell chamber (Glockenraum, bell-shaped chamber), at the same time, the valve piston is arranged in cooperation with the discharge opening provided at the lower part to close the valve. The inlet val...

AI Technical Summary

Problems solved by technology

Known pneumatically controlled drain valves (as described above and in figure 1 Drain valve shown as an example in ) does not adequately drain the cooler after the compressor has been shut down

In addition, the displacement is also limited by the filling volume of the valve.

As a result, condensate accumulates in the cooler chamber, which condensate adversely affects the function of the compressor

The functional reliability of such valves is also limited by condensation accumulating on the membrane, since aggressive condensation damages the membrane and shortens its service life

If the membrane no longer seals reliably due to damage, compressed air and condensate can flow into the hood and thus in particular also to the outside, even with the inlet valve closed, whereby the compressor significantly loses delivery power

Images