Patent ID: 6772791
Filing Date: 2004-08-10
Classification: F16K,Y10S,Y10T

Abstract:
A directly operated valve assembly comprising:a valve body having a pressurized air supply inlet port in communication with a source of pressurized air, and at least one cylinder port; a valve bore extending axially within said valve body; a valve member supported within said valve bore and movable between predetermined positions within said valve bore to selectively direct pressurized air from said inlet port through said at least one cylinder port; an actuator mounted to said valve body for moving said valve member in a first direction and a biasing member disposed between said valve member and said valve body adapted to providing a biasing force to said valve member in an opposite direction; and an air-assist passage providing a source of pneumatic pressure that acts in combination with said biasing member to operatively move said valve member in a direction opposite to the movement induced by said actuator.