Patent ID: 6357475
Filing Date: 2002-03-19
Classification: F15B,Y10T

Abstract:
A pneumatic sequential control valve for successive aeration and deaeration of two consumers, wherein for purposes of aeration compressed air is initially applied to the first consumer and only subsequently to the second consumer, and for deaeration the compressed air is initially let off from the second consumer and only subsequently from the first consumer, which sequential control valve comprises:a valve body with connections for a compressed air line and a first consumer and second consumer, wherein a cavity having a longitudinal axis is provided in the valve body, and a first bore hole extends from the connection for the first consumer to this cavity; further a second bore hole extends from the connection for the second consumer to this cavity; and further a third bore hole extends from the connection for the compressed air line to this cavity; a control slide which is mounted in this cavity so as to be displaceable in a direction of the longitudinal axis of the cavity and which has a first end side and a second end side and is displaceable to a first end position and to a second end position; said first bore hole and said third bore hole communicating with each other in the first end position of the control slide, and the second bore hole and the third bore hole communicating with each other in the second end position of the control slide; a control space being provided between the first end side of the control slide, at which a piston surface is arranged, and the valve body, the volume of the control space being at a minimum in the first end position of the control slide and at a maximum in the second end position of the control slide; the control space communicating with the third bore hole via a choke line; and said control slide being pretensioned in direction of a first end position by means of a spring arrangement.