ARI Armaturen PREDEX®
ARI overflow pressure regulator, straight-through design, with diaphragm actuator, without auxiliary energy.
ARI-PREDEX is an overflow (overpressure) regulator in straight-through design, operated by a diaphragm actuator, which limits the upstream pressure without using auxiliary energy. The order code combines the pressure class and the body material, for example 22.705 for PN16 in ductile iron or 65.705 for PN40 in stainless steel; the range covered is DN15–DN150, at PN16, PN25 or PN40, with actuators from the UDA40–UDA400 range for various setting ranges.
For a quotation we need the DN, the pressure rating (PN), the desired pressure range for the setting, the medium handled, the working temperature and the preferred body material. A new regulator is delivered to order from the European Union, in 1–4 weeks; we do not carry out the sizing calculation of the actuator.
Models and codes
| Code | Note |
|---|---|
| 12.705 | PN16, grey cast iron body EN-JL1040 |
| 22.705 | PN16, ductile iron body EN-JS1049 |
| 23.705 | PN25, ductile iron body EN-JS1049 |
| 34.705 | PN25, cast steel body 1.0619+N |
| 35.705 | PN40, cast steel body 1.0619+N |
| 62.705 | PN16, stainless steel body 1.4581 |
| 65.705 | PN40, stainless steel body 1.4581 |
Key specifications
| Nominal range | DN 15–150 |
|---|---|
| Pressure ratings | PN16 / PN25 / PN40 |
| Temperature range | -60…+350 °C |
| Diaphragm actuator | UDA40–UDA400 |
| Setting range, UDA400 | 0.2–0.6 bar |
| Setting range, UDA40 | 8–16 bar |
| Connection type | DIN EN 1092-1/-2 flanges |
| Available body materials | EN-JL1040, EN-JS1049, 1.0619+N, 1.4581 |
The ARI-PREDEX 705001 data sheet is current in the manufacturer's documentation, with no announcement of withdrawal from production.
Frequently asked questions
What do you need for a quotation for an ARI-PREDEX regulator?
The DN and the pressure rating (PN16, PN25 or PN40), the desired pressure range for the setting, the medium handled, the maximum working temperature and the preferred body material (cast iron, cast steel or stainless steel). With these data we identify the exact code from the 705 range.
How do I choose the right actuator for my pressure range?
The UDA40 to UDA400 actuators cover different ranges, from 0.2–0.6 bar (UDA400) up to 8–16 bar (UDA40); the choice depends on the setting pressure required by the installation. We confirm the correct variant starting from the data sent by the customer.
Who does the sizing calculation for an ARI regulator?
We do not carry out the regulator sizing calculation for the customer's installation; this remains with the process engineer or is checked directly by ARI. We do not promise lead times shorter than those indicated by the manufacturer.
Other ARI Armaturen series
We do not carry out the sizing calculation of the overflow pressure regulator; we recommend that it is checked by the process engineer or directly by ARI.
Updated: 2026-11-12