Differential pressure relief controller (PN 16, 25, 40) AFPA / VFG 2(1)

Transcription

1 Data sheet Differential pressure relief controller (, 25, 40) AFPA / VFG 2() Description The controller has a control valve, an actuator with one control diaphragm and spring for differential pressure setting. Further on two valve versions are available: - VFG 2 with metallic sealing cone - VFG 2 with soft sealing cone The controller is a self-acting differential pressure relief controller primarily for use in district heating systems. The controller is normally closed and opens on rising differential pressure. Main data: DN k VS 4,0-400 m 3 /h, 25, 40 Setting range: - 0,05-0,3 bar / 0,-0,6 bar / 0,5-,2 bar / 0,5-2,5 bar / -5 bar Temperature: - Circulation water / glycolic water up to 30 %: 2 40 / 50 / 200 C Connections: - Flange Ordering Example : Differential pressure relief controller; DN 5; k VS 4,0; ; metallic sealing; setting range 0,5-,2 bar; T max 50 C; flange; - VFG 2 DN 5 valve Code no: 065B AFPA actuator Code no: 003G02-2 Impulse tube set AF Code no: 003G39 Products will be delivered separatly. VFG 2 Valves (metallic sealing cone) Picture DN k VS T max Code No. Connections (mm) (m 3 /h) ( C) PN 25 PN ,0 065B B B ,3 065B B B ,0 065B B B B B B B B B ) B B B B B B B B B Flanges acc. to EN B B B B B B B B B B B B2423 Impulse tube set AF B ) 065B B Note: other valves available on special request. ) at temperatures above 50 C (DN 5-25)/40 C (DN ) only with seal pots (see Accessories)

2 Ordering (continuous) Example 2: Differential pressure relief controller; DN 5; k VS 4,0; ; metallic sealing; setting range 0,5-,2 bar; T max 200 C; flange; - VFG 2 DN 5 valve Code no: 065B AFPA actuator Code no: 003G02-2 Impulse tube set AF Code no: 003G39-2 Seal pot V Code no: 003G392 Products will be delivered separatly. VFG 2 Valves (soft sealing cone) Picture DN k VS T max Code No. Connections (mm) (m 3 /h) ( C) 5 4,0 065B ,3 065B ,0 065B B B B Flanges acc. to EN B B B B B B B254 Seal pots V Impulse tube set AF Note: other valves available on special request. AFPA Actuators Picture p setting range (bar) for DN Code No. Accessories G ,5-2,5 003G020 0,5-,2 003G02 0,-0, G022 0,05-0,3 003G023 Picture Type designation Description Connections Code No. Impulse tube set AF Seal pot V ) Seal pot V2 ) Compression fitting 2) - Copper tube Ø0 500 mm - compression fitting for imp. tube connection to pipe (G /4) - 2 socket Capacity liter; with compression fittings for imp. tube Ø0-003G39-003G392 Capacity 3 liter; with compression fittings for imp. tube Ø0, for actuator size 630 cm 2-003G403 For impulse tube Ø0 connections to controller G /4 003G468 Shut off valve Throttle valve For impulse tube Ø0-003G40 065B2909 ) Seal pot has to be used on impulse tubes always when T max 50 C (DN 5-25) / 40 C (DN ) 2) Consist of a nipple, compression ring and nut 2

3 Ordering (continuous) Service kits Picture Type designation Valve insert DN k VS Code No. (mm) (m 3 /h) for VFG 2 for VFG 2 5 4,0 065B B ,3 065B B B B B B B B B B B B B Stuffing cone (with EPDM O-rings) 003G464 Technical data Valve Nominal diameter DN k VS value m 3 /h 4,0 6,3 8, Cavitation factor z 0,6 0,6 0,6 0,55 0,55 0,5 0,5 0,45 0,4 0,35 0,3 0,2 0,2 Leakage acc. to standard IEC 534 (% of k VS) VFG 2 0,03 0,05 VFG 2 0,0 Nominal pressure, 25, 40 Max. differential pressure 6 bar PN 25, Medium Circulation water / glycolic water up to 30 % Medium ph Min. 7, max. 0 Medium temperature Connections Materials Valve body VFG / ) 2 40 / ) C VFG PN 25 Flange Grey cast iron EN-GJL-250 (GG-25) Ductile iron EN-GJS-400(GGG-40.3) PN 40 Cast steel GP240GH (GS-C 25) Valve seat Stainless steel, mat. No..402 Stainless steel, mat. No..433 Valve cone Stainless steel, mat. No Sealing VFG 2 VFG 2 Metal EPDM Stainless steel, mat. No..402 Pressure relieve system Bellows (Stainless steel, mat. No..457) Diaphragm (EPDM) ) at temperatures above 50 C (DN 5-25)/40 C (DN50-250) only with seal pots (see Accessories) Actuator Type Actuator size cm Max. operating pressure bar Diff. pressure setting ranges and spring colours Materials Actuator housing Control diaphragm Impulse tube bar AFPA silver yellow silver yellow yellow -5 0,5-2,5 0,5-,2 0,-0,6 0,05-0,3 Stainless steel, mat. No..0338, zinc plated and yellow chromate EPDM (Rolling; fibre enforced) Stainless steel tube Ø0 0,8 mm copper tube Ø0 mm, threaded fitting G /4, ISO 228 3

4 Application principles Differential pressure control for a pump in bypass Installation position DN 5-80 T max 20 C The controllers can be installed in any position. DN 5-80 T max > 20 C; DN The controllers can be installed in horizontal pipes only, with a pressure actuator oriented downwards. DN 5-80 T max 20 C DN 5-80 T max > 20 C; DN

5 Pressure temperature diagram Working area is below P-T line and it ends at T max for each valve working area EN-GJL-250 (GG-25) 40 (for DN ) Maximum allowed operating pressure as a function of medium temperature (according to EN 092-2) PN 25 working area EN-GJS-400 (GGG-40.3) Maximum allowed operating pressure as a function of medium temperature (according to EN 092-2) PN 40 EN-GP-240-GH (GS-C 25) working area 40 (for DN ) Maximum allowed operating pressure as a function of medium temperature (according to EN 092-) Note: at temperatures above 50 C (DN 5-25) / 40 C (DN ) only with seal pots (see Accessories) Sizing Given data: Q max = 4,5 m 3 /h p AFPA =,4 bar Nominal pressure k v value is calculated according to formula: Q 4.5 k max v p.4 AFPA k v = 3,8 m 3 /h Solution: The example selects AFPA VFG 2 DN 5, k VS value 4,0 with differential pressure setting range 0,5 2,5 bar. 5

6 Design. Valve body 2. Cover 3. Valve seat 4. Valve insert 5. Pressure relieved valve cone 6. Valve stem 7. Bellows for pressure relief of valve cone 8. Actuator 9. Diaphragm for pressure relief of valve cone 0. Control diaphragm for differential pressure control. Setting spring for diff. pressure control 2. Adjuster for diff. pressure setting, prepared for sealing 3. Stuffing cone 4. Union nut 5. Compression fitting for impulse tube 6. Upper casing of diaphragm 7. Lower casing of diaphragm 8. Valve body extension 9. Shut off valve for water filling 20. Closing plug VFG 2 DN , T max 40 C VFG 2 DN , T max 200 C AFPA / VFG 2 DN 5-25 Function The pressures in front and behind of the control valve are being transferred through the impulse tubes to the actuator chambers and act on control diaphragm for diff. pressure control. Control valve is normally closed. It opens on rising differential pressure and closes on falling differential pressure to maintain constant differential pressure. Settings Differential pressure setting Differential pressure setting is being done by the adjustment of the setting spring for differential pressure control. The adjustment can be done by means of spring for differential pressure setting and pressure indicators. 6

7 Dimensions L L L Ø 89 H B B H H VFG DN 5-25 VFG DN B VFG 2, VFG 2 Valves VFG DN with valve body extension up to 200 C DN L B mm H Weight / 25 kg 7,5 8, , PN ,5 60, B mm H Weight (valve with body extension) / 25 kg PN A 240 Seal pot V H Ø Seal pot V2 ø60 Ø0 AFPA Actuator Actuator size cm A mm H mm SW SW9 G/4 Weight kg 7, Shut off valve Compression fitting 7

8 8 VD.CA.N3.02 Produced by Danfoss A/S 05/203