Valve control has helical spring with ends, coils and interior, two fluid chambers, thrust bearing, and passages

摘要

The valve control part is in the form of a helical spring (2) connected on the outside to a first fluid chamber (7) the interior (17) of which is connected to the second fluid chamber (14). In a closed position, the coils (3) of the helical spring are tightly compressed. In an open position, the coils are splayed apart to open a fluid passage. At least one end (4,5) of the spring is placed on a control (9) and on a static thrust bearing part (6). At least one passage is between the spring interior and a second fluid chamber (14).