AVK SURGE ANTICIP./RELIEF CONTROL VALVE, PN16
Reduced bore, SS-316/DI trim, SS-316 pilot, fittings/accs., EPDM/WRAS rubber, blue 300µm GSK coating
Contact
Pham Trung
Technical Manager
Control valve, surge anticip./relief, for drinking water or other neutral liquids to max. 70°C
AVK series 879/8X diaphragm actuated surge anticipation and relief control valves constantly monitor the system pressure and protect against pressure surges. The pressure relief opens the valve to dump excess pressure when it exceeds the high setpoint. The surge anticipation senses the rapid pressure drop from a suddenly failed pump that is often followed by a rapid and dangerous high-pressure surge. The drop below the low setpoint opens the valve, this time to make it ready to dissipate the anticipated pressure surge. A replaceable spring inside the pilot makes it possible to operate in different pressure ranges and still keep the high precision. Precise setting and easy adjustment on a control knob on the pilots. 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 879/008X99-002 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile iron |
| PN: | PN10/16 |
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 316
- 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
Components
| 1. | Body | Ductile iron EN-GJS-500-7 |
| 2. | O-ring | EPDM rubber |
| 3. | O-ring | EPDM rubber |
| 4. | Plug sealing | EPDM rubber |
| 5. | Nut | Stainless steel A4 |
| 6. | Washer | Stainless steel A4 |
| 7. | Bolt | Stainless steel A4 |
| 8. | Diaphragm | EPDM rubber |
| 9. | Spring | Stainless steel AISI 316 |
| 10. | Seal | EPDM rubber |
| 11. | Seal | EPDM rubber |
| 12. | Cover | Ductile iron EN-GJS-500-7 |
| 13. | Nut | Stainless steel A4 |
| 14. | Diaphragm support | Ductile iron EN-GJS-500-7 |
| 15. | Obturator | Ductile iron EN-GJS-500-7 |
| 16. | Regulating plug | Stainless steel AISI 316 |
| 17. | Seat | Stainless steel AISI 316 |
| 18. | Stem | Stainless steel AISI 316 |
| 19. | Pilot valve | Stainless steel AISI 316 |
| 20. | Pilot valve | Stainless steel AISI 316 |
| 21. | Pressure gauge | Stainless steel AISI 316 |
| 22. | Ball valve | Stainless steel AISI 316 |
| 23. | Needle valve | Stainless steel AISI 316 |
| 24. | Y-strainer / Orifice | Stainless steel AISI 316 |
Test/Approvals
- Hydraulic test: 1.5 x PN |
- Tested according to EN 12266-1
- Approved according to ACS-France
- Approved according to WRAS Certificate 2010005, max 50°C
Standards
- EN 1074-5
- Face-to-face dimension according to EN 558, basic series 1
- Flange drilling to EN1092, PN10/16
