| 摘要 |
<p>A restrictor mechanism (50) is provided in a pilot operated solenoid valve that restricts the pilot flow to the actuating piston (34) of the valve if the pressure differences within the valve are great. This reduces the actuating forces allowing the valve to open or close softly. As the pressures within the valve start to balance, the restrictor device opens, allowing full pilot flow to hold the valve in position.</p> |
