Dynamic balancing valve for control of flow rate independently of pressure

A 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,
• wherein the secondary equipment (33) can linearly shift with respect to the main equipment (32) for pre-setting said maximum flow rate of the valve,
• wherein said main equipment (32) and said secondary equipment (33) are coaxial one to the other and act on respective coaxial orifices (62, 26) of passage of the fluid,
• wherein said secondary equipment (33) is placed inside said main equipment (32), and
• wherein said main equipment (32) is housed in a containment sleeve (35), where said elastic means (38) are placed, which tend to push the main equipment (32) towards said actuator (40), the latter working by thrust, by means of a pusher (42) and a transmission rod (51) which transmits the motion to the main equipment (32), to bring the items of equipment (32, 33) close to said orifices (62, 26).

A 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,
• wherein the secondary equipment can linearly shift with respect to the main equipment (32) for pre-setting said maximum flow rate of the valve,
• wherein said main equipment (32) and said secondary equipment (33) are coaxial one to the other and act on respective coaxial orifices (62, 26) of passage of the fluid,
• wherein said secondary equipment (33) is placed inside said main equipment (32), and
• wherein said secondary equipment (33), housed in the main equipment (32), has the shape of a cylindrical pin having an upper annular flange (72) housed in a widened skirt (75) of the main equipment (32) and suitable for abutting against a step (76) formed in the latter in the lower end of stroke position determining the minimum flow rate presetting condition, while at the base of said conical tip (77) an annular projection (78) is provided, suitable for abutting against a step (79) of the main equipment (32) in the upper end of stroke position of the secondary equipment, corresponding to the maximum flow rate presetting condition.