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AVK CONSTANT FLOW CONTROL VALVE, PN16

Reduced bore, EN558/s. 1 AISI304 fittings. EPDM/WRAS rubber, 300µm blue EP

Anthony Whittam AVK UK Network Water Specialist

Anthony Whittam

Network Water Specialist

Control valve, constant flow, for drinking water or other neutral liquids to max. 70°C. The series offer two ranges, reduced bore and full bore. The reduced bore has reduced capacity compared to the full bore. For further info on full bore see separate datasheet 879/102X99-001.

AVK series 879 diaphragm actuated flow control valves (CFV) automatically maintain a constant flow regardless of changes in inlet or outlet pressure.

Feed back to the regulating system is by means of the pressure drop across an orifice at the outlet.

The replaceable orifice makes it possible to regulate within a large range of flows and still keep the precision. Setting and adjustment on a control knob on the pilot.

Both full bore and reduced bore versions are available with the full bore having full capacity and the reduced bore having increased precision and smooth regulation at low flow rates.

Variant 879/002X99-001
Connection: Flanged
Material: Ductile Iron
DN: DN300 - DN600
PN: PN 10/16

Features

  • The lifted seat design controls the flow around the plug so that in case of cavitation this happens with minimal damage away from plug and seat
  • The parabolic shape of the plug creates a smooth regulating characteristic with low gain around the near-closed positions improving control performance at low flow
  • Non-symmetric axial position of rubber diaphragm results in low stretch stress when closed
  • Body and bonnet of ductile iron coated with fusion bonded epoxy, 300µm, GSK approved, RAL 5017, according to DIN 3476 and WRAS-DVGW/W270/UBA
  • All rubber parts approved for drinking water
  • All non-coated internals made of stainless steel or bronze
  • Seat and pilot in stainless steel AISI 304
  • A needle valve fitted between the upstream side and the control chamber allows for adjustment of the regulation reaction time
  • Closing the needle valve isolates the control chamber and fixes the position of the main valve allowing for service of the pilot valve
  • Fittings, pipes and accessories in Ni-plated brass

Downloads

Certificate(s)
Datasheet
Installation, Operation & Maintenance
Related Datasheets
Tender Text

Reference nos. and dimensions:

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Ref. no. DN
mm		 Flange
drillling		 Flow range
m3/h		 D1
mm		 D2
mm		 D3
mm		 Dh
mm		 W
mm		 H3
mm		 L
mm		 L1
mm		 Theoretical
weight / kg
879-0300-00-14400239999 300 PN16 400-1100 370 410 460 28 555 760 850 867 220
879-0350-00-14400209999 350 PN16 160-500 429 470 520 28 605 845 980 997 323
879-0400-00-14400209999 400 PN16 220-620 480 525 580 31 710 970 1100 1117 494
879-0400-00-14400219999 400 PN16 300-1000 480 525 580 31 710 970 1100 1117 494
879-0400-00-14400239999 400 PN16 660-1950 480 525 580 31 710 970 1100 1117 494
879-0450-00-14400209999 450 PN16 270-800 548 585 640 31 780 1030 1200 1217 641
879-0450-00-14400229999 450 PN16 570-1900 548 585 640 31 780 1030 1200 1217 641
879-0450-00-14400239999 450 PN16 900-2650 548 585 640 31 780 1030 1200 1217 641
879-0500-00-14400209999 500 PN16 330-950 609 650 715 34 930 1215 1250 1267 931
879-0500-00-14400229999 500 PN16 700-2400 609 650 715 34 930 1215 1250 1267 931
879-0500-00-14400239999 500 PN16 1050-3000 609 650 715 34 930 1215 1250 1267 931
879-0600-00-04400229999 600 PN10 950-3300 682 725 780 31 1020 1325 1450 1467 1268
879-0600-00-14400229999 600 PN16 950-3300 720 770 840 37 1020 1325 1450 1467 1268
Enquiry
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Components

1. Body Ductile iron GJS-500-7
2. O-ring EPDM
3. O-ring EPDM
4. Plug sealing EPDM
5. Hex Nut Stainless steel A2
6. Washer Stainless steel 304
7. Bolts Stainless steel A2
8. Diaphragm EPDM
9. Spring Stainless steel 304
10. Flat Seal EPDM
11. Flat Seal EPDM
12. Cover Ductile iron GJS-500-7
13. Hex Nut Stainless steel A2
14. Diaphragm Support Ductile iron GJS-500-7
15. Obturator Ductile iron GJS-500-7
16. Regulating Plug Stainless steel 304
17. Seat Stainless steel 304
18. Stem Stainless steel 304
19. Pilot valve Stainless steel
20. Stainless steel 304
21. Ball valve
22. Needle valve Stainless steel
23.

Test/Approvals

  • Hydraulic test: 1.5 x PN |

  • Tested according to EN12266-1. Seat: 1.1 x PN (in Bar), Body: 1.5 x PN (in Bar)

Standards

  • Designed according to EN 1074 - 5
  • Face to face according to EN558 Table 2 Basic Series 1
  • Standard flange drilling to EN1092 (ISO 7005-2), PN 10/16
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