AVK NEEDLE VALVE, PN25
Gearbox for modulating duty, stainless steel trim, DN80-700
Contact
Martin Børsting
Team Leader and Product Manager, Control Valves
Needle valve PN25 for pressure and flow control applications, for water and neutral liquids to max. 70° C.
AVK series 872 needle valves are designed for throttling and control of pressure and flow at high flow rates and high differential pressures. The focus is on durability and reliability with the sturdy valve housing made of either stainless steel or ductile iron coated with fusion bonded epoxy. It controls with high precision and the high quality materials guarantee long service life with easy maintenance access. Gearbox construction with bronze worm wheel to ensure precise regulation kept throughout lifetime.
| Variant 872/00-005 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile Iron |
| DN: | DN80 - DN700 |
| PN: | PN 25 |
Features
-
Gearbox with bronze worm wheel for continuously modulating duty, minimum 1.2 million modulating steps
- One-piece body construction
- Symmetrical flow path ensures evenly distributed flow around the entire seat in any open position
- Pressure balance in chamber inside for low operating torque
- Internal body shape is optimized to give low head loss coefficient
- 4 - 6 guide rails ensure very low vibration
- Main seal mounted on the piston as opposed to on the seat preventing abrasion when fitted with anti cavitation trim
- Gaskets in polyurethane for high resistance to abrasion
- All iron parts coated with min. 250 μm fusion bonded epoxy, blue RAL 5005
- Easy access for maintenance
- Double O-rings sealed drive shaft
- Stainless steel internal parts and fasteners
- Functions:
- Flow control
- Pressure regulation
- Pump start
- Reservoir inlets
- Discharge
- Turbine by-pass
- Air regulation
Downloads
Reference nos. and dimensions:
| AVK ref. no. | DN mm |
Flange drilling |
A mm |
B mm |
D mm |
H3 mm |
L mm |
W mm |
Theoretical weight/kg |
Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| 872-0080-00-70900300100 | 80 | PN25 | 125 | 117 | 100 | 230 | 260 | 330 | 31 | Face to face according to EN 558, series 48 |
| 872-0100-00-70900300100 | 100 | PN25 | 145 | 117 | 120 | 235 | 300 | 370 | 42 | |
| 872-0150-00-70900300100 | 150 | PN25 | 175 | 150 | 135 | 300 | 350 | 435 | 75 | |
| 872-0200-00-70100300000 | 200 | PN25 | 220 | 150 | 150 | 425 | 400 | 510 | 105 | |
| 872-0250-00-70100300000 | 250 | PN25 | 260 | 155 | 165 | 475 | 450 | 580 | 165 | |
| 872-0300-00-70100300000 | 300 | PN25 | 305 | 284 | 185 | 535 | 500 | 695 | 289 | |
| 872-0350-00-70100300000 | 350 | PN25 | 345 | 305 | 205 | 595 | 550 | 770 | 315 | |
| 872-0400-00-70100300000 | 400 | PN25 | 385 | 305 | 235 | 660 | 600 | 845 | 440 | |
| 872-0500-00-70100300000 | 500 | PN25 | 445 | 305 | 245 | 785 | 700 | 960 | 683 | |
| 872-0600-00-70100300000 | 600 | PN25 | 505 | 305 | 280 | 925 | 800 | 1078 | 940 | |
| 872-0700-00-70100300000 | 700 | PN25 | 565 | 380 | 315 | 1045 | 900 | 1185 | 1100 |
Components
| 1. | Shaft | Stainless steel 1.4028 |
| 2. | Screw | Stainless steel A2-70 |
| 3. | Key | Stainless steel |
| 4. | Ring cap | Alu-bronze CC333G |
| 5. | O-ring | EPDM rubber |
| 6. | Bush | Alu-bronze CC333G |
| 7. | Bush | Alu-bronze CC333G |
| 8. | O-ring | EPDM rubber |
| 9. | Plug | Plastic |
| 10. | Ogive | Stainless steel 1.4028 |
| 11. | O-ring | EPDM rubber |
| 12. | Body | Ductile iron GJS-500-7 (GGG-50) |
| 13. | Crank | Ductile iron GJS-500-7 (GGG-50) |
| 14. | Pin | Stainless steel 1.4028 |
| 15. | Split pin | Stainless steel 1.4301 |
| 16. | Bush | Alu-bronze CC333G |
| 17. | Guide | Brass CW617N |
| 18. | Piston tube | Stainless steel 1.4301 |
| 19. | Eye bolt | Steel, zinc coated |
| 20. | Gasket | Polyurethane |
| 21. | O-ring | EPDM rubber |
| 22. | Gasket | Polyurethane |
| 23. | Piston flange | Stainless steel 1.4301 |
| 24. | Fixing plate | Stainless steel 1.4301 |
| 25. | Bush | Alu-bronze CC333G |
| 26. | Connection rod | Stainless steel 1.4028 |
| 27. | Pin | Stainless steel 1.4028 |
| 28. | Body seal ring | Stainless steel 1.4301 |
| 29. | Key | Stainless steel |
| 30. | Socket screw | Stainless steel A2-70 |
| 31. | Bolt, socket head | Stainless steel A2-70 |
| 32. | Guide | Brass CW617N |
| 33. | Fixing gasket ring | Stainless steel 1.4301 |
| 34. | Bolt, hexagon head | Stainless steel A2-70 |
| 35. | Bolt, socket head | Stainless steel A2-70 |
| 36. | Bolt, socket head | Stainless steel A2-70 |
| 37. | Gearbox |
Test/Approvals
- Hydraulic test according to EN 1074-1 and 2 / EN 12266
- Hydraulic test according to EN 1074-1 and 5/ EN12266, seat: 1.1 x PN (in bar), body 1.5 x PN (in bar)
- Approved according to WRAS Certificate No. 2301010
- Approved according to SABESP Brazil
Standards
- Designed according to EN 1074 - 5
- Face-to-face dimension according to EN 558 Table 2 Basic Series 15
- Standard flange drilling to EN1092-2 (ISO 7005-2), PN25
