Flow Control and Differential Pressure Controller AFPQ / VFQ 2(21) - Installation in return line AFPQ 4 / VFQ 2(21) - Installation in flow line Description / Application AFPQ VFQ AFPQ 4 VFQ The controller is a self-acting differential pressure and flow controller primarily for use in district heating systems. AFPQ closes on rising differential pressure or when set max. flow is exceeded. Main data: - DN 15-250 - PN 16, 25, 40 - Max. temperature 200 o C - Flow and return mounting The controller has a control valve (flange connection) with adjustable throttle for flow setting, an actuator with two diaphragms and a spring for differential pressure setting. Ordering Example Flow controller AFPQ / VFQ 2, DN 65, PN 25, t max. 150 o C, differential pressure 0.1-0.7 bar - 1x VFQ 2 DN 65 valve Code no: 065B267-1x AFPQ actuator Code no: 00G1029-1x AFPQ impulse tube Code no: 00G171 Option: - 1x AF impulse tube Code no: 00G191 Parts will be delivered separatly. Valves VFQ 2 (metallic sealing cone) DN k vs T max. Code No. mm m /h o C PN 16 PN 25 PN 40 15 4.0 150 200* 065B2654 065B2667 065B2677 20 6. 150 200* 065B2655 065B2668 065B2678 25 8.0 150 200* 065B2656 065B2669 065B2679 2 16 150 200* 065B2657 065B2670 065B2680 40 20 150 200* 065B2658 065B2671 065B2681 50 2 150 200* 065B2659 065B2672 065B2682 65 50 150 200* 065B2660 065B267 065B268 80 80 150 200* 065B2661 065B2674 065B2684 100 125 150 200* 065B2662 065B2675 065B2685 125 160 150 200* 065B266 065B2676 065B2686 150 280 140-065B2664-065B2687 200 20 140-065B2665-065B2688 250 400 140-065B2666-065B2689 150 280-200* 200 20-200* on request 250 400-200* * temperatures up to 200 o C only with seal pots SIBC VD.CA.A1.02 Danfoss 06/01 1
Ordering (continuous) Valves VFQ 21 (soft sealing cone) DN k vs t max. Code No. mm m /h o C PN 16 PN 25 PN 40 15 4.0 150 065B2690 065B270 065B271 20 6. 150 065B2691 065B2704 065B2714 25 8.0 150 065B2692 065B2705 065B2715 2 16 150 065B269 065B2706 065B2716 40 20 150 065B2694 065B2707 065B2717 50 2 150 065B2695 065B2708 065B2718 65 50 150 065B2696 065B2709 065B2719 80 80 150 065B2697 065B2710 065B2720 100 125 150 065B2698 065B2711 065B2721 125 160 150 065B2699 065B2712 065B2722 150 280 140 065B2700-065B272 200 20 140 065B2701-065B2724 250 400 140 065B2702-065B2725 Actuators AFPQ / AFPQ 4 Diff. pressure Eff. diff. pressure Nominal press. Code No. (bar) (bar) (PN) AFPQ (return) AFPQ 4 (flow) 0.1-0.7 0.2 00G1029 00G10 0.1-0.7 0.5 00G100 00G104 40 0.15-1.5 0.2 00G101 00G105 0.15-1.5 0.5 00G102 00G106 AFPQ impulse tubes (return mounting), stainless steel Ø 10 x 0.8 mm (150 o C) DN (mm) Code No. 15 00G165 20 00G166 25 00G167 2 00G168 40 00G169 50 00G170 65 00G171 80 00G172 100 00G17 125 00G174 150 00G175 200 00G176 250 00G177 AFPQ 4 impulse tubes (flow mounting), stainless steel Ø 10 x 0.8 mm (150 o C) DN (mm) Code No. 15 00G178 20 00G179 25 00G180 2 00G181 40 00G182 50 00G18 65 00G184 80 00G185 100 00G186 125 00G187 150 00G188 200 00G189 250 00G190 Example Flow control and differential pressure controller AFPQ / VFQ 2, DN 65, PN 25, t max. 200 o C, differential pressure 0.1-0.7 bar - 1x VFQ 2 DN 65 valve Code no: 065B267-1x AFPQ actuator Code no: 00G1029-1x AFPQ impulse tube Code no: 00G171-1x AF impulse tube Code no: 00G191-2x V1 seal pot Code no: 00G192 Parts will be delivered separatly. Accessories for temperature up to 200 o C AF impulse tubes, seal pot V1 AFPQ / VFQ Type Description Ordering no. Code No. Seal pot V1 With threaded fittings for tube AFPQ - 1x 00G192 (capacity 1l) Ø 10 AFPQ 4 - x Impulse tube - Copper tube Ø 10 x 1 x 1500 mm AFPQ DN 15-150 - 1x 00G191 AF - 1 x threaded fitting G 1/4 ISO 228-2x socket AFPQ4 DN 15-150 - 2x AFPQ4 DN 200, 250 - x Seal pot V1 Set AFPQ Set AF AFPQ 4 / VFQ Set AFPQ 4 Seal pot V1 Set AF 2 VD.CA.A1.02 Danfoss 06/01 SIBC
Technical data Valves VFQ 2, VFQ 21 Nominal diameter (DN) 15 20 25 2 40 50 65 80 100 125 150 200 250 k vs value (m /h) 4 6. 8 16 20 2 50 80 125 160 280 20 400 0.1-0.2-0.2-0.4-0.6-0.8 - - 4-6 - 8-12 - 15-18 - Range of flow rate 0.2 bar (m /h) 2 4 7 11 16 28 40 6 80 125 150 180 by eff. diff. pressure 0.5 bar (m /h) 0.2-0. - 0. - 0.5-0.8-1.2-4 - 6-9 - 12-18 - 22-25 - ( p eff. ) 4.5 6 10 16 24 40 58 90 120 180 220 250 z value 0.6 0.6 0.6 0.55 0.55 0.5 0.5 0.45 0.4 0.5 0. 0.2 0.2 Dif. pressure p max. PN 16 (bar) ** 16 16 16 16 16 16 16 16 15 15 12 10 10 Dif. pressure p max. PN 25, 40 (bar) ** 20 20 20 20 20 20 20 20 15 15 12 10 10 Nominal pressure PN 16, 25 or 40, flanges to DIN 2501 Max. temperature VFQ 2 With metallic sealing cone up to 150 o C 140 o C With metallic sealing cone with seal pots up to 200 o C 200 o C* VFQ 21 With soft sealing cone up to 150 o C 140 o C Flow medium Water for heating, district heating and cooling systems, min. 5 o C Pressure balance Stainless steel bellows, mat. No.1.4571 Rolling diaphragm PN 16 Grey cast iron EN-GJL-250 (GG-25) Valve body material PN 25 Ductile iron EN-GJS-400 (GGG-40.) PN 25/PN 40 Cast steel GP240GH (GS-C 25) Cone material Stainless steel, mat. No. 1.4404 * with seal pots (2) and body extension ** min. required differential pressure across the valve is: Δp z value: noise coefficient as per VDMA 24 422 Pressure actuators AFPQ Actuator size (cm 2 ) 250 Effective diff. pressure (bar) 0.2 / 0.5 Setpoint range (diff. pressure) (bar) 0.1-0.7 / 0.15-1.5 Nominal pressure PN 40 Actuator casing Rolling diaphragm Steel, mat. No.1.08, zinc plated and yellow chromate Nomex-Nylon and EPDM Impulse tube Stainless steel tube Ø10 x 0.8 mm or copper tube Ø10 x 1 mm, threaded fitting G 1/4, ISO 228 Seal pot Steel, lacquered, capacity 1l (V1), mounted in impulse tubes above 150 o C, (140 o C - DN 200 + 250) Flow medium eff. 2 V + k vs Water for heating, district heating and cooling systems, min. 5 o C SIBC VD.CA.A1.02 Danfoss 06/01
Design and function 1 2 1 2 4 4 14 14 5 5 7 8 9 10 7 8 9 10 11 12 11 12 1 1 AFPQ - return mounting AFPQ 4 - flow mounting 1. Flow rescrictor throttle 2. Valve body. Valve seat 4. Trim 5. Bonnet 6. Filling valve 7. Actuator casing 8. Effective pressure spring 9. Rolling diaphragm 10. Excess pressure safety 11. Control line connection 12. Setpoint spring 1. Setpoint adjustment for differential pressure 14. Bellow VFQ 2 DN 150-250 9 6 VFQ 2 DN 150-250 with body extension up to 200 o C 9 Flow volume causes the pressure difference on the flow rescrictor throttle. Pressure difference acts through the impulse tubes on the control diaphragm. Differential pressure (effective pressure) and flow are limited by the means of the built-in control spring. Pressure arising from the flow and return line are being transferred through the impulse tubes on the control diaphragm. Control valve closes on rising differential pressure and opens when differential pressure is reduced to maintain constant differential pressure. AFPQ controls are fitted with pressure limiting valve, which protects actuator from too high differential pressure. 4 VD.CA.A1.02 Danfoss 06/01 SIBC
Application principles - Flow mounting (AFPQ 4) Direct-connected heating system Indirectly connected heating system - Return mounting (AFPQ) Direct-connected heating system Indirectly connected heating system Installation position Controls DN 15-80 with flow medium temperature up to 120 o C can be installed in any position. In case of controls DN 100-250 and if temperature exceeds 120 o C (all nominal diameter), they have to be installed in horizontal pipes only, with a pressure actuator oriented downwards. The external impulse tube must be fitted between the flow- or return line and control actuator. AF impulse tubes listed under Accessories can be used. Setting Flow limiter is set by the adjustment of the of the flow rescrictor throttle. The adjustment can be performed on the basis of sizing diagram (see the AFPQ mounting instruction) or by the means of flow indicator. Controls DN 200 + 250 are to be set by the flow indicator only. SIBC VD.CA.A1.02 Danfoss 06/01 5
Combinations Example Flow control and differential pressure controller AFT06 / AFPQ / VFQ 2 DN 65, PN 25, t max. 150 o C effective differential pressure 0.2 bar, range 20-90 o C 1 4-1x VFQ 2 DN 65 valve Code no: 065B267 2 4-1x AFPQ actuator Code no: 00G1029 5-1x AFT06 thermostat Code no: 065-491 - 1x KF2 combination piece Code no: 00G198-2x AF impulse tube Code no: 00G191 KF2 / AFQ** / AFP** / VFQ 2 Parts will be delivered separatly. AFT06 / KF2 / AFPQ / VFQ 2 1. Valve VFQ 2 2. Thermostat AFT06, 26, 17, 27 *. Impulse tube AF 4. Combination piece KF2 5. Actuator AFPQ * see Data sheet AFT06,... ** see Data sheet AFP / VFG, AFQ / VFQ Combination piece Type Code No. Combination 00G198 piece KF2 Combination piece KF 00G197 Note: KF2 use always in combination with thermostats KF for combination with pressure actuators and electrical actuators 6 VD.CA.A1.02 Danfoss 06/01 SIBC
Dimensions L L B1 B B VFQ DN 15-125 VFQ DN 150-250 Valves VFQ 2, VFQ 21 VFQ DN 150-250 with body extension up to 200 o C DN 15 20 25 2 40 50 65 80 100 125 150 200 250 L (mm) 10 150 160 180 200 20 290 10 50 400 480 600 70 B (mm) 212 212 28 28 240 240 275 275 80 80 26 54 404 Weight (kg) 7 9 10 1 17 22 41 60 79 85 145 228 B1 (mm) - - - - - - - - - - 60 855 1205 Weight (kg) - - - - - - - - - - 140 210 00 A H Actuators AFPQ, AFPQ 4 Actuator type AFPQ / AFPQ 4 Ø A (mm) 257 H for x s = 0.1-0.7 / 0.15-1.5 (mm) 520/540 H for x s = 0.2-0.5 (mm) 50 Weight (kg) 4 Ø 89 120 B 240 Seal pot V1 70 Comb. piece KF2, KF SIBC VD.CA.A1.02 Danfoss 06/01 7
8 VD.CA.A1.02 Danfoss 06/01 SIBC