Valve unit with inlet and outlet ducts

摘要

The valve inlet duct (2) is connectable to a source (P) of compressed air. The outlet duct (5) is connectable to a load. A check valve (6) between the inlet and outlet ducts has a control duct (12) for releasing the check valve. The valve unit (1) connected in series with the releasable check valve has a further check valve (14) containing an adjustable throttle (13) connected in parallel series. The valve unit has a manual ventilator (15,15') for the outlet duct without applying control pressure on the control duct. The manual ventilator has a pretensioned locking piece (7).