Patent ID: 6729346
Filing Date: 2004-05-04
Classification: F15B,Y10T

Abstract:
A pneumatic valve for controlling a volume flow of an operating gas supplied from a gas supply under pressure, comprising:a valve body having first and second ports for entry and exit of the operating gas, a main connection line provided for linking the ports and including two parallel ring channels separated by a ridge, and a cross bore extending across the valve body and intersecting the main connection line; an adjustable throttle including a control element defined by an axis and having an outer surface area, said control element being received in the cross bore for movement between first and second end positions and having a control opening provided for connection of the ring channels and configured in the form of V-shaped grooves which extend outwards to the outer surface area of the control element and have a first groove portion which tapers gradually in direction of the axis of the control element and a second portion which extends transversely to the axis to thereby define for the operating gas an effective area which is bounded in radial direction by the ridge and a circumferential surface area of the control opening of the control element and progressively decreases as the control element moves from the first end position toward the second end position, said throttle further including a counterforce member opposing a movement of the control element toward the second end position; and a flow orifice disposed in the main connection line, wherein the throttle and the orifice are disposed in series in the main connection line, and wherein, as viewed in movement direction, the control element is acted upon on a side confronting the first end position by gas pressure commensurate with a gas pressure upstream of the orifice, and acted upon on a side confronting the second end position by gas pressure commensurate with a gas pressure downstream of the orifice, for controlling the effective area of the control opening in dependence on a difference between the gas pressures upstream and downstream of the orifice.