IMI TA Hydronics DA-616 25/10 slėgio perkryčio reguliatorius
- Application: constant Δp on a higher-load substation branch
- DN: 25 — higher-load DA-616 variant
- Kvs: 10 m³/h — suits ~80-150 kW heating load
- Autonomy: hydraulic operation, no electrics
Where DA-616 DN25 Kvs 10 is used
Designed for higher-load heat substations — commercial buildings, high-rise blocks, schools, hotels. Ensures constant Δp across a larger consumer branch when individual users (floors, zones) have their own control devices (thermostatic heads, PICV valves) and must not disturb each other's hydraulic conditions.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 52-861-025 |
| Series | IMI TA Hydronics DA-616 |
| Type | Automatic differential pressure (Δp) controller |
| DN | 25 |
| Kvs | 10 m³/h |
| Nominal pressure (PN) | 16 bar (verify in IMI catalogue) |
| Δp setting range | Per variant — see IMI documentation |
| Connection | Internal thread (Rp) |
| Temperature range | -10 → +120 °C |
| Media | Heating/cooling water, glycol up to 50 % |
| Body material | DZR brass / bronze (per IMI documentation) |
| Capillary tube | Ordered separately (52-850-915 or equivalent) |
Capacity — quick calculation
Water flow: Q = Kvs × √Δp. Heat capacity: P = Q × ΔT × 1.163.
Example: setting Δp = 0.3 bar (30 kPa) → Q = 10 × √0.3 ≈ 5.48 m³/h. With ΔT = 20 °C → P ≈ 127 kW.
When to choose DA-616 DN25 Kvs 10
- Commercial/office buildings up to ~150 kW heating load
- High-rise multi-family heating headers
- Schools, hotels with a shared heating network branch
- When extra reserve for future expansion is required
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across the EU (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation for valve sizing
Official IMI Hydronic catalogue: imi-hydronic.com
Frequently asked questions
Can it be used on the primary district heating loop?
No. DA-616 is designed for the consumer side (secondary loop). The primary DH loop typically uses different regulators (usually PICV — combined flow and Δp controllers, e.g. Danfoss AVQM or IMI TA-Modulator series).
What are the maintenance requirements?
DA-616 essentially requires no periodic maintenance. A Y-strainer (500 μm) upstream is recommended for debris protection. A functional test every 5 years is advised — to check the Δp setpoint has not drifted.
Can the setpoint be changed after installation?
Yes. The setpoint is adjusted with a handle without system shutdown. Adjustment is best done at nominal operating conditions so the result reflects real regulation.
How does DA-616 interact with room thermostatic valves?
Thermostatic valves regulate flow, DA-616 regulates pressure drop. Together they form a stable control loop: when a thermostatic valve closes (room reaches setpoint), DA-616 holds the same Δp for the other thermostats, so they do not shift their operating point. Result — uniform heat distribution across the whole riser.
