IMI TA Hydronics DA-616 20/8 slėgio perkryčio reguliatorius
- Application: constant Δp on medium-load heating risers
- DN: 20 — mid-range DA-616 size
- Kvs: 8 m³/h — suits ~40-90 kW heating load
- Autonomy: hydraulic operation, no electrics
Where DA-616 DN20 Kvs 8 is used
Standard variant for medium-load risers in multi-family buildings (3-5 storeys), apartment metering schemes with higher loads, small commercial substation consumer branches. DA-616 DN20 ensures thermostatic valves react to consumer demand, not to system fluctuations caused by other users' behaviour.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 52-861-020 |
| Series | IMI TA Hydronics DA-616 |
| Type | Automatic differential pressure (Δp) controller |
| DN | 20 |
| Kvs | 8 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 = 8 × √0.3 ≈ 4.38 m³/h. With ΔT = 20 °C → P ≈ 102 kW.
When to choose DA-616 DN20 Kvs 8 over DN15 Kvs 5
- Medium-load heating risers with capacity 40-90 kW
- Multi-family buildings (3-5 storeys) with combined branch load
- Apartment metering schemes with larger apartment loads (>100 m²)
- When reserve for future growth is required — DN20 leaves more room
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
Is a companion flow limiter valve required?
DA-616 is a Δp controller. In some layouts it is paired with a flow-limiting valve (e.g. STAD or PICV series) — the pair guarantees both a constant Δp and a specific maximum flow.
How can I check that the valve operates correctly?
Using the capillary tube T-tappings, Δp across the consumer branch can be measured. If Δp stays stable regardless of thermostatic head positions (while other consumers change flow in the system) — the controller works correctly.
Can it be used in cooling systems?
Yes. DA-616 suits both heating (up to 120 °C) and cooling (down to -10 °C). In cooling mode ensure proper insulation to prevent diaphragm frosting from condensate.
Why does Δp fluctuate more than expected?
Common causes: (1) blocked capillary tube (clean/replace), (2) oversized Kvs (authority too low — β > 0.5 needed), (3) system air pockets (vent), (4) debris on valve seat (clean, add strainer upstream).
