Danfoss SAVA safety pressure relief controller, PN 25, DN 40, Kvs 20 m³/h, 1 – 4.5 bar setting, flange

Danfoss SAVA (003H6688) — self-acting safety pressure relief controller, PN 25, DN 40, for district heating and central heating systems. The SAVA is a safety pressure relief controller that needs no external power or control signal; the setpoint is set on the actuator spring and the reduced/relieved pressure is sensed through an impulse line to the control diaphragm. It is normally open in standby and opens (as a bypass) when the pressure upstream rises above the setpoint, discharging flow to relieve and limit the over-pressure; when the pressure falls back it re-closes. Pressure setting range 1 – 4.5 bar adjustable; Kvs 20 m³/h; maximum differential-pressure range 16 bar; media temperature 2–150 °C; cavitation factor z ≥ 0.6; seat leakage 0.05 % Kvs (IEC 60534). Valve body Ductile iron EN-GJS-400-18-LT (GGG 40.3); valve cone dezincing-free brass CuZn36Pb2As; seat stainless steel 1.4571; control diaphragm EPDM. Flange connection, PN 25 (mating flanges, gaskets and bolts ordered separately). Media: district heating/cooling circulation water (glycolic water up to 30%), pH 7–10. Mounting version Bypass; stem position Normally closed. OEM P/N 003H6688. EAN 5702421542095. Technical data quoted verbatim from store.danfoss.com (code 003H6688).

Code number

003H6688

Type

SAVA

Product group

Pressure and flow controllers (safety pressure controller)

Function

Self-acting safety pressure relief controller (SÜV) — normally closed, opens on rising pressure to relieve/limit over-pressure

Valve size

DN 40

Pressure class

PN 25

Connection

Flange, PN 25

Kvs value

20 m³/h

Pressure setting range

1 – 4.5 bar (adjustable)

Max. differential pressure range

16 bar

Media temperature

2 – 150 °C

Media pH

7 – 10

Cavitation factor z

≥ 0.6

Seat leakage rate

0.05 % Kvs (IEC 60534)

Mounting version

Bypass

Stem position

Normally closed

Number of ports

2

Permissible media

District heating/cooling circulation water (glycolic water up to 30%)

Valve body material

Ductile iron EN-GJS-400-18-LT (GGG 40.3)

Valve cone material

Dezincing free brass CuZn36Pb2As

Valve seat material

Stainless steel, mat. No. 1.4571

Actuator diaphragm

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

14.684 kg

Gross weight

14.684 kg

EAN

5702421542095

HS code

8481.80

Material

Valve body Ductile iron EN-GJS-400-18-LT (GGG 40.3); valve cone dezincing-free brass CuZn36Pb2As; seat stainless steel, mat. No. 1.4571; control diaphragm + DP sealing EPDM

Pressure Rating

PN 25 (max. differential-pressure range 16 bar)

Temperature Range

2 to 150 °C (district heating/cooling water); glycolic water up to 30%

HS Code

8481.80