✅ Spring-loaded operation for precise pressure control
✅ Compact design with a standard bellows seal
✅ Proportional flow characteristic for smooth pressure adjustment
✅ Maintenance-free design
✅ Exact and easy pressure adjustment
✅ Available in grey cast iron, SG iron, cast steel, and stainless steel
Technical Specifications
Valve Types & Configurations
- Straight-through design with flanged connections
- Spring-loaded mechanism for differential pressure control
Material Options & Pressure Ratings
| Model | Nominal Pressure (PN) | Material | Nominal Diameter (DN) |
|---|---|---|---|
| 12.753 | PN16 | Grey cast iron (EN-JL1040) | DN15-100 |
| 22.753 | PN16 | SG iron (EN-JS1049) | DN15-100 |
| 32.753 | PN16 | Cast steel (1.0619+N) | DN15-100 |
| 52.753 | PN16 | Stainless steel (1.4408) | DN15-100 |
Other materials and special versions are available upon request.
Pressure Ranges & Adjustment Options
| Pressure Range (bar) |
|---|
| 0.5 - 1.5 bar |
| 1.0 - 3.0 bar |
| 2.0 - 5.0 bar |
| 4.0 - 10.0 bar |
- Precise and easy pressure setting using the adjusting screw
- Leakage class IV according to DIN EN 1349 (≤ 0.01% of nominal flow)
Flow Performance & Dimensions
| DN (Size) | Kvs Value (m³/h) | Seat-Ø (mm) | Travel (mm) | Height (mm) | Weight (kg) |
|---|---|---|---|---|---|
| DN15 | 2.0 | 21 | 2.0 | 230 | 3.6 |
| DN20 | 2.5 | 21 | 2.0 | 230 | 4.1 |
| DN25 | 3.0 | 27 | 2.5 | 290 | 6.6 |
| DN32 | 5.0 | 31 | 2.5 | 300 | 7.7 |
| DN40 | 10.0 | 41 | 4.0 | 325 | 10.4 |
| DN50 | 20.0 | 51 | 5.5 | 330 | 12.9 |
| DN65 | 22.0 | 66 | 7.0 | 400 | 20.2 |
| DN80 | 29.0 | 81 | 8.0 | 440 | 28.9 |
| DN100 | 45.0 | 101 | 10.0 | 500 | 43.7 |
Applications
The ARI-PRESO® is ideal for:
✔ Pump protection – Maintains minimum flow through bypass lines
✔ Heat exchangers & thermal oil systems – Ensures stable pressure in circulation systems
✔ Piping networks – Prevents excessive differential pressures
✔ Condensate systems – Prevents flashing and maintains pressure balance
Installation & Operation
- Designed for easy installation in standard pipeline systems
- Available with DIN EN 1092-1/-2 standard flanges
- Maintenance-free operation ensures long service life
- Pressure settings can be easily adjusted via an external screw mechanism