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

Reduced bore, AISI304/DI trim, AISI304 pilot, stainless steel fittings/accs., EPDM/WRAS rubber

Anthony Whittam AVK UK Network Water Specialist

Anthony Whittam

Head of Smart Water and Pressure Management

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 reduced bore has reduced capacity compared to the full bore.

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, 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 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 879/001X99-001
Connection: Flanged
Material: Ductile Iron
DN: DN65 - 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
  • 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 stainless steel
  • A variety of pilot spring tensions are available to allow for different pressure ranges.

Downloads

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

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
879-0065-00-14400119999 65 PN16 2-15 118 145 185 19 250 440 290 20
879-0080-00-14400119999 80 PN16 2-15 132 160 200 19 275 460 310 24
879-0100-00-14400119999 100 PN16 2-15 156 180 220 19 290 475 350 29
879-0125-00-14400119999 125 PN16 2-15 184 210 250 19 310 495 400 33
879-0150-00-14400119999 150 PN16 2-15 211 240 285 23 330 535 480 46
879-0200-00-14400119999 200 PN16 2-15 266 295 340 23 415 625 600 96
879-0250-00-14400119999 250 PN16 2-15 319 355 405 28 510 730 730 157
879-0300-00-14400119999 300 PN16 2-15 370 410 460 28 555 805 850 221
879-0350-00-14400119999 350 PN16 2-15 429 470 520 28 605 885 980 324
879-0400-00-14400119999 400 PN16 2-15 480 525 580 31 710 1010 1100 495
879-0450-00-14400119999 450 PN16 2-15 548 585 640 31 780 1070 1200 642
879-0500-00-14400119999 500 PN16 2-15 609 650 715 34 930 1255 1250 932
879-0600-00-04400119999 600 PN10 2-15 682 725 780 31 1020 1365 1450 1269
879-0600-00-14400119999 600 PN16 2-15 720 770 840 37 1020 1365 1450 1269
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)

  • Approved according to WRAS Series 879

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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