HYDRAULIC CONTROL VALVE ASSEMBLY AND CONTROL SYSTEM FOR WATER SUPPLY NETWORKS.

摘要

A modular hydraulic control valve assembly (1) for use in a pilot-operated hydraulic control system comprises a control valve (2) including a valve body (3) defining a main flow passage from an inlet (4) on a high pressure side (5) of the control valve to an outlet (6) on a low pressure side (7) of the control valve, a valve member (13) arranged in the flow passage and separating the high pressure side from the low pressure side, a control chamber (10) comprising means for hydraulic actuation of the valve member by applying a control pressure to the control chamber so as to position the valve member between an open position and a closed position thereby adjusting a main flow through the main flow passage in response to the control pressure, a feed port (31) for feeding fluid to the control chamber to increase the control pressure therein, a bleed port (32) for bleeding fluid from the control chamber to decrease the control pressure therein, and a valve bonnet (8) closing the control chamber. The assembly further comprises a feed check valve (41) determining a feed flow direction, a bleed check valve (42) determining a bleed flow direction, a distribution block (9) including a common plenum, a control input (27) in fluid communication with the common plenum, and a control output (28) in fluid communication with the common plenum, wherein the distribution block further comprises a feed channel (31) connecting the common plenum with the feed port via an adjustable feed constriction, and a bleed channel (32) connecting the common plenum with the bleed port via an adjustable bleed constriction.