DYNAMIC BALANCING VALVE FOR CONTROL OF FLOW RATE INDEPENDENTLY OF PRESSURE

摘要

Pressure independent flow rate control valve, for placement in hydraulic systems between upstream inlet and downstream outlet ducts, including a first functional unit arranged between the inlet and outlet ducts, mobile equipment actuated manually or by an actuator for setting and modifying the orifice span of a fluid passage, and thus the valve flow rate, up to complete closure; and a second functional unit for maintaining the differential pressure constant between upstream and downstream of the first unit, and thus the set valve flow rate independently of pressure fluctuations in the hydraulic system. The mobile equipment includes main equipment and secondary equipment which can linearly translate with respect to the main equipment for presetting the maximum valve flow rate, the main equipment carrying integrally the secondary equipment and being linearly displaced by the actuator for modulating the fluid flow rate from the preset maximum one up to complete closure.

主权项

1. Pressure independent flow rate control valve (PICV), apt to be placed in hydraulic systems between an upstream fluid inlet duct (13) and a downstream outlet duct (14), comprising a first functional unit (Kv) arranged between said inlet duct (13) and said outlet duct (14), comprising mobile equipment (30) which can be actuated manually or by means of an actuator (40) for setting and modifying the span of an orifice of passage of the fluid, and thus the valve flow rate, up to complete closure; and a second functional unit (Δp) apt to maintain the differential pressure (P2−P3) between both sides upstream and downstream of said first unit (Kv) constant, and thus the set flow rate of the valve independently of the fluctuations of the pressures in the hydraulic system, wherein said mobile equipment (30) comprises main equipment (32) carrying integrally a secondary equipment (33), and being displaceable by means of said actuator (40) for modulating the flow rate of the fluid from a preset maximum flow rate up to complete closure, and the secondary equipment (33) can linearly shift with respect to the main equipment (32) for presetting said maximum flow rate of the valve.