Danfoss AVA pressure relief controller, PN 25, DN 20, 3–11 bar adjustable, Kvs 6.3 m³/h, external thread G 1 A
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Product Description
Danfoss AVA (003H6621) — self-acting pressure relief controller, PN 25, DN 20, for district heating and cooling systems. The AVA is a self-acting pressure relief controller; it is normally closed and opens on rising pressure. It has a control valve, an actuator with one control diaphragm and a spring for the pressure setting. Pressure setting range 3–11 bar adjustable; Kvs 6.3 m³/h. Maximum differential-pressure range 20 bar; media temperature 2–150 °C; cavitation factor z ≥ 0.6; seat leakage 0.02 % Kvs (IEC 60534). Valve body Red bronze CuSn5ZnPb (Rg5); valve cone Dezincing free brass CuZn36Pb2As; seat Stainless steel, mat. 1.4571; control diaphragm and DP sealing EPDM. Connection External thread G 1 A (ISO 228/1), via tailpieces. Mounting version Bypass. Permissible media: District heating/cooling circulation water (glycolic water up to 30%). OEM P/N 003H6621. Technical data quoted verbatim from store.danfoss.com (code 003H6621) and the Danfoss AVA (PN 25) pressure relief controller data sheet. 1.4571; control diaphragm and DP sealing EPDM; Pressure rating: PN 25 (max. differential-pressure range 20 bar); Temperature range: 2 to 150 °C (district heating/cooling water); HS code: 8481.80. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants. No.
Technical Specifications
- Code number
- 003H6621
- Type
- AVA
- Product group
- Pressure and flow controllers (pressure relief controller)
- Function
- Self-acting pressure relief controller (opens on rising pressure)
- Valve size
- DN 20
- Pressure class
- PN 25
- Connection
- External thread G 1 A (ISO 228/1), via tailpieces
- Kvs value
- 6.3 m³/h
- Pressure setting range
- 3 - 11 bar (adjustable, factory range)
- Max. differential pressure range
- 20 bar
- Media temperature
- 2 - 150 °C
- Cavitation factor z
- ≥ 0.6
- Seat leakage rate
- 0.02 % Kvs (IEC 60534)
- Mounting version
- Bypass
- Permissible media
- District heating/cooling circulation water (Glycolic water up to 30%)
- Valve body material
- Red bronze CuSn5ZnPb (Rg5)
- Valve cone material
- Dezincing free brass CuZn36Pb2As
- Valve seat material
- Stainless steel, mat. No. 1.4571
- Diaphragm / DP sealing
- EPDM
- EU RoHS compliance
- Yes with exemptions (6(c))
- REACH Candidate List substance
- Lead (CAS no. 7439-92-1)
- China RoHS
- Out of scope
- Net weight
- 5.243 kg
- Gross weight
- 5.573 kg
- EAN
- 5702421541418
Standards & Compliance
- Material
- Valve body Red bronze CuSn5ZnPb (Rg5); valve cone Dezincing free brass CuZn36Pb2As; valve seat Stainless steel, mat. No. 1.4571; control diaphragm and DP sealing EPDM
- Pressure Rating
- PN 25 (max. differential-pressure range 20 bar)
- Temperature Range
- 2 to 150 °C (district heating/cooling water)
- HS Code
- 8481.80
Compatibility & Fitment
Danfoss AVA for DN 20 district-heating/cooling circuits at PN 25. Set the relief-pressure setpoint within 3–11 bar. Confirm the connection (External thread G 1 A (ISO 228/1), via tailpieces) and pressure class (PN 25) match the pipework; order the matching tailpiece/union-nut set and impulse tube separately. Maximum differential-pressure range 20 bar, media temperature up to 150 °C.
Product Documentation
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Technical guides
- Cross-Referencing Danfoss Refrigeration Components by IMPA and OEM Code
- Danfoss Product Code Decoder — 003Z, 013G, 017B, 023U, 027L, 032F, 060G, 060H, 065B, 065Z, 068Z, 084H, 132F, 148B Series (Complete Reference)
- Danfoss Maneurop MTZ Reciprocating Compressors — Model Range, Voltage Codes and Replacement Guide
Catalogue entry last verified: 2026-08-29. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy 003H6621?
- 003H6621 can be ordered from cballast.com as a Danfoss catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this Danfoss product?
- The manufacturer part number is 003H6621.
- What is the HS code for 003H6621?
- The customs tariff (HS) code for 003H6621 is 8481.80.
- Who manufactures 003H6621?
- 003H6621 is a Danfoss product in the HVAC & Refrigeration range.
- Is a datasheet available for 003H6621?
- Yes — the 003H6621 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 003H6621?
- The minimum order quantity is 1.
- Is 003H6621 available?
- Yes — 003H6621 is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).