Balancing valve – Ductile iron
A flanged, ductile iron balancing valve that delivers accurate hydronic performance in an impressive range of applications. The STAF-SG is ideal for use mainly on the secondary side in heating and cooling systems.
Technical description
Application:
Heating (not steam) and cooling systems
Functions:
Balancing
Pre-setting
Measuring
Shut-off (The restriction cone for valve sizes DN 65-400 is pressure released).
Dimensions:
STAF: DN 65-150
STAF-SG: DN 20-400
Pressure class:
Class 150
Temperature:
Max. working temperature: 120°C
Min. working temperature: -20°C
Material:
Body: Ductile iron, EN-GJS-400-15 (~ ASTM A536 Grade 60-40-18. ISO 1083 Grade 400-15).
Bonnet: DN 20-150 AMETAL®, DN 200-400 ductile iron.
Restriction cone: DN 20-200 AMETAL®, DN 250-300 bronze, DN 350-400 silicon brass.
Spindle: AMETAL®.
Seat seal: Cone with EPDM ring.
Bonnet bolts: Chromed steel.
Handwheel: DN 20-150 polyamide, DN 200-400 aluminium.
AMETAL® is the dezincification resistant alloy of TA.
Surface treatment:
DN 20-200: Epoxy painting.
DN 250-400: Duasolid painting.
Marking:
DN 20-50: TA, PN, DN (mm), 400-15 (material) and flow direction arrow.
DN 65-400: TA, Class 150, size (inch), 60-40-18 (material), casting date and flow direction arrow.
CE-marking according to table:
Marking | STAF-SG
(Class 150) |
CE | DN 50-125 |
CE 0409* | DN 150-400 |
*) Notified body.
Flanges:
DN 20-50: ISO 7005-2 and EN 1092-2. Bolt circle according to Class 150 ASME/ANSI B16.42.
DN 65-400: Class 150 ASME/ANSI B16.42 (~ PN 20 according to ISO 7005-2).
Face to face:
According to ISO 5752 series 1 and EN 558-1 series 1.