AVK PRESSURE REDUCING CONTROL VALVE, PN16
Reduced bore, V-port seat, DI body, SS control circuit and pipe, EPDM/WRAS rubber
AVK UK
Gas & Water Sales
Control valve, pressure reducing, for drinking water or other neutral liquids to max. 70°C
AVK series 879 diaphragm actuated pressure reducing control valves (PRV) automatically maintain a constant outlet pressure regardless of flow demand or changes in inlet pressure.
A replaceable spring inside the pilot makes it possible to operate in different pressure ranges and still keep the high precision. Setting and adjustment by a control screw 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 879/040X99-003 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile Iron |
| 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 V-shape 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
- Fittings, pipes and accessories in AISI 316
- A needle valve between upstream side and 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
- OPTION OF:
- Air vent on top cover
- Anti-cavitation cylinder
- Valve position transmitter
- Limit switches
Downloads
Components
| 1. | Body | Ductile iron GJS-500-7 |
| 2. | Seat | Stainless steel 316 |
| 3. | O-ring | NBR rubber |
| 4. | O-ring | NBR rubber |
| 5. | Bolt | Stainless steel A4 |
| 6. | Washer | Stainless steel A4 |
| 7. | Cover | Ductile iron GJS-500-7 |
| 8. | Bush | Bronze |
| 9. | Spring | Stainless steel 316 |
| 10. | Nut | Stainless steel A4 |
| 11. | Diaphragm | |
| 12. | Support ring | Ductile iron GJS-500-7 |
| 13. | Obturator | Ductile iron GJS-500-7 |
| 14. | Main seal | EPDM |
| 15. | Seal retainer | Stainless steel 316 |
| 16. | Stem | Stainless steel 316 |
| 17. | Plug | Stainless steel 316 |
| 18. | Screw | Stainless steel A4 |
| 19. | Stainless steel | |
| 20. | Stainless steel 316 | |
| 21. | Pilot valve | Stainless steel 316 |
| 22. | Pressure gauge | Stainless steel 316 |
| 23. | Ball valve | Stainless steel 316 |
| 24. | Needle valve | Stainless steel 316 |
| 25. | Filter | Stainless steel 316 |
Test/Approvals
-
Tested according to EN12266-1. Seat: 1.1 x PN (in Bar), Body: 1.5 x PN (in Bar)
| - Hydraulic test: 1.5 x PN
- WRAS approved Materials
Standards
- Designed according to EN 1074 - 5
- Face to face according to EN558 Table 2 Basic Series 1
- Standard flange drilling to EN1092, PN 10/16
