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AVK PRESS. SUSTAINING/RELIEF CONTROL VALVE, PN10/16

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

Anthony Whittam AVK UK Network Water Specialist

Anthony Whittam

Network Water Specialist

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

AVK series 879 diaphragm actuated pressure sustaining control valves (PSV) automatically secure a minimum upstream pressure by reducing the flow if the upstream pressure drops below the setpoint.

Adjusting the setpoint above the usual operating pressure changes the function to pressure relief (PRV), where the valve automatically opens to dump excess upstream pressure if it exceeds the setpoint.

A replaceable spring inside the pilot makes it possible to operate in different pressure ranges and still keep the high 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 879/101X99-001
Connection: Flanged
Material: Ductile Iron
DN: DN50 - 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		 Pilot range
bar		 D1
mm		 D2
mm		 D3
mm		 Dh
mm		 W
mm		 H3
mm		 L
mm		 Theoretical
weight / kg
879-0050-10-14400119999 50 PN16 2-15 99 125 165 19 250 425 230 18
879-0065-10-14400119999 65 PN16 2-15 118 145 185 19 250 450 290 23
879-0080-10-14400119999 80 PN16 2-15 132 160 200 19 265 465 310 27
879-0100-10-14400119999 100 PN16 2-15 156 180 220 19 285 485 350 36
879-0150-10-14400119999 150 PN16 2-15 211 240 285 23 410 630 480 82
879-0200-10-04400119999 200 PN10 2-15 266 295 340 23 510 715 600 138
879-0200-10-14400119999 200 PN16 2-15 266 295 340 23 510 715 600 138
879-0250-10-04400119999 250 PN10 2-15 319 350 395 23 555 780 730 199
879-0250-10-14400119999 250 PN16 2-15 319 355 405 28 555 780 730 199
879-0300-10-04400119999 300 PN10 2-15 370 400 445 23 605 850 850 256
879-0300-10-14400119999 300 PN16 2-15 370 410 460 28 605 850 850 256
879-0350-10-04400119999 350 PN10 2-15 429 460 505 23 710 970 980 457
879-0350-10-14400119999 350 PN16 2-15 429 470 520 28 710 970 980 457
879-0400-10-04400119999 400 PN10 2-15 480 515 565 28 780 1030 1100 543
879-0400-10-14400119999 400 PN16 2-15 480 525 580 31 780 1030 1100 543
879-0450-10-04400119999 450 PN10 2-15 530 565 615 28 930 1210 1200 869
879-0450-10-14400119999 450 PN16 2-15 548 585 640 31 930 1210 1200 869
879-0500-10-04400119999 500 PN10 2-15 582 620 670 28 1020 1285 1250 1114
879-0500-10-14400119999 500 PN16 2-15 609 650 715 34 1020 1285 1250 1114
879-0600-10-04400119999 600 PN10 2-15 682 725 780 31 1090 1430 1450 1673
879-0600-10-14400119999 600 PN16 2-15 720 770 840 37 1090 1430 1450 1673
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. Pressure gauge Stainless steel
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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