IMPROVEMENT IN CONTROL CIRCUIT FOR OPERATION OF PNEUMATICALLY PROPELLED VEHICLES

摘要

The improvement in a control circuit for the operation of pneumatically propelled vehicles consists of a propulsion duct formed by a guideway (1) and power propulsion units (3) with flow control valves (4) located at intervals along the guideway (1). Atmospheric valves (2) are located at specific points along the guideway (1), opening and closing the duct to the atmosphere, and the section isolation valves (6) are positioned in such a way as to isolate adjacent blocks of the guideway (1) and at the same time to maintain the functioning of the propulsion circuit in the other blocks. The atmospheric valve (2) is coupled to an aperture (11) in the guideway (1) and consists of a butterfly valve. The power propulsion unit has a single interconnection duct (5) leading to and from the guideway (1), and a set of four butterfly-type airflow control valves (4), with two of the valves (4) communicating with the interconnection duct (5) and two of the valves communicating with the atmosphere, so as to allow the generation of positive or negative pressure in the guideway duct (1), depending on the combination of open and closed positions.