Valve that keeps the flow rate constant during operation within a certain differential pressure range thanks to a membrane device with a contrast spring. Complete with two pockets G 1/4"F for piezometric sockets (IVAR AVB 10) and with plugs for piezometric sockets and cartridge. PICV 100 (female) connections: G 1"F, G 1"1/4F in compliance with ISO 228/1. PICV 105 (male - flat seal) connections: G 1"M, G 1"1/4M, G 1"1/2M in compliance with ISO 228/1. PICV 110 (with unions) connections: G 3/4"M, G 1"M, G 1"1/4M in compliance with ISO 228/1 and EN 10226-1. To combine with PICC 11, PICC 12 or PICC 13 cartridges. PICC connection: M54x1.5. Compatible with water or glycol solutions max 30%. Min operating temperature: -20 °C. Max operating temperature: 120 °C. Max operating pressure: 25 bar. Max closing pressure with PICC 13: 4 bar. Valve material: CW617N brass. Sealing gaskets material: Peroxide EPDM. IVAR PICC 11: 8 flow rate ranges to set; brass and POM insert; HNBR/Peroxide EPDM diaphragm; Peroxide EPDM sealing gaskets. IVAR PICC 12: 41 flow rate ranges to set even during operation; brass and PSU insert; HNBR/Peroxide EPDM diaphragm; Peroxide EPDM sealing gaskets. IVAR PICC 13: 41 flow rate ranges to set even during operation; to combine with IVAR RV 03 axial motor (M30x1.5; 2 points/3 points 230 V AC or 2 points/3 points 24 V AC or proportional 0-10 V 24 V AC adjustment); max closing pressure 4 bar; brass and PSU/POM/PPS (glass-fibre reinforced) insert; stainless steel internal metal components; PPS/Peroxide EPDM cone; HNBR/Peroxide EPDM diaphragm; Peroxide EPDM sealing gaskets.