STV-ROT, -MA, -MAC Balancing valve Refurbishment

Area of use

The manual balancing valves STV (-ROT, MA, MAC) is used to balance the flow in
heating-and cooling systems.
STV-ROT is adapted for renovation.
STV-MA is adapted fot thin-walled steel pipes.
STV-MAC is adapted for copper pipes.

Description

STV (-ROT, MA, MAC) are sized with nomogram, handwheel or online applications on smartphones or on our webside.
STV (-ROT, MA, MAC) shall be dimensioned at 50-80% of maximum flow for the design flow.
Min recommended differential pressure is 2 kPa (0,29 psi).

Setting
The hand wheel has digital reading which shows whole turns and tenth of a turn.
The hand wheel setting corresponds to Kv. The setting is shown in table format or can be calculated
by using software on the website.
Any setting can be locked to avoid tampering with the setting of the balancing value. An Allen key of 3 mm is used on the inner spindle to lock the setting. When the setting is locked the valve cannot be opened to a larger value but it can be closed for maintenance of the connected circuit.

Measuring
The pressure test ports are opened by unscrewing the lids.
Differential pressure can be measured using a balancing instrument.

Draining
STV is equipped with a drain.
The drain is opened with a screwdriver

Mounting
STV-ROT is mounted with internal steel pipe connection.
STV-MA is pressed with a pressing tool.
STV-MAC is pressed with a pressing tool.

Recommended pressing tool:
Geberit Pressbackar

Technical data

Pressure class
PN 20
Max temperature
120 C
Min temperature
-20°C
Max closing pressure
10 bar
Min closing pressure
2 kPa
Material
Dezincifi cation resistance brass
Gaskets EPDM

Order designations

RSK-number Article number Designation Description
489 27 42 9001283 STV ROT 15/10 Balancing valve threaded with drain, clamping ring
489 27 43 9001284 STV ROT 20/15 Balancing valve threaded with drain, clamping ring
489 27 44 9001285 STV ROT 25/20 Balancing valve threaded with drain, clamping ring
489 27 45 9001286 STV ROT 32/25 Balancing valve threaded with drain, clamping ring
489 27 46 9001286 STV MA 15/10 Balancing valve threaded without drain, press joint
489 27 47 9001288 STV MA 22/15 Balancing valve threaded without drain, press joint
489 27 48 9001289 STV MA 28/20 Balancing valve threaded without drain, press joint
489 27 49 9001290 STV MA 35/25 Balancing valve threaded without drain, press joint
489 27 50 9001291 STV MA 42/40 Balancing valve threaded without drain, press joint
489 27 51 9001292 STV MA 54/50 Balancing valve threaded without drain, press joint
489 27 52 9001293 STV MAC 15/10 Balancing valve threaded without drain, press joint
489 27 53 9001294 STV MAC 22/15 Balancing valve threaded without drain, press joint
489 27 54 9001295 STV MAC 28/20 Balancing valve threaded without drain, press joint