English - IMI STAF Manual De Instrucciones

English

General
The STAF/STAG valves are classified within the Pressure Equipment Directive (European Parliament and
Council directive 2014/68/EU) with the consistency level as set out in the table 1.
STAF, STAF-SG, STAF-R and STAG are intended for heating and refrigeration installations, STAF-R is also
intended for tap water installations. (Fluids in group 2 according to the directive).
Differential pressure measurement should take place with extreme care especially if this concerns hot media.
Marking
The valve housing is marked with the following data:
TA: Manufacturer
Material according to table 2
DN according to table 3
Max. permitted pressure PS (PN) according to table 4
CE-marking according to table 5 (* Registered body)
Casting date: year of manufacture, month and day
→ Flow arrow for the recommended direction of flow
In addition to that stated on the valve housing, it applies:
• Max. permitted temperature: 120°C
• Min. permitted temperature: -10°C
Installation
The valve should be kept in a dry, clean location and protected from damage and contamination.
Before you install the valve, check that:
• the valve is clean and undamaged.
• the pipe system has been cleaned.
• surfaces the seals are to seal against are clean and undamaged.
• demands on straight pipe lengths before the valve, after a bend respective pump, as well as after the valve
must be observed (fig 1).
STAF
Check that the counter-flanges are parallel before you install the valve. Lubricate the threads on the bolts and fit
washers. Tighten the bolts crosswise using a torque wrench to the tightening torque set out in tables 6 to 8.
Check that the flat seals are in accordance with the given standard for flanges and that they are centred correctly.
STAG
Before you install the valve, check that the outside diameter of the valve connection ends and the pipe are the
same as well as that grooves for couplings are in accordance with the coupling manufacturer's instructions.
Check that the rubber seals are undamaged and have been fitted correctly.
Pressure switch and thermostat
In order to guarantee the lowest and highest pressure as well as to ensure that the temperature is not exceeded
the system should be fitted with a pressure switch and thermostat.
Exception: The pressure may be exceeded when pressure testing, max 24 bar (PN 16) respective 37.5 bar (PN 25).
Commissioning
Test the pressure on the valve using cold water.
Let the valve remain fully open while the system is flushed clean.
Tighten the flange joints and check for leakage in connection with commissioning.
Presetting
The valve's opening position can be read on the digital handwheel. The number of turns between fully open and
the closed position are shown in table 9.
Presetting the valve to 2.3 turns is done as follows:
1. Close the valve fully (fig 2).
2. Open the valve to 2.3 (fig 3).
3. Using the allen key turn the inner stern clockwise to the stop (fig 4).
The valve is now set and can be closed, but not opened more than 2.3 turns.
Maintenance
The STAF/STAG valves are maintenance free under the condition that they are used within their normal
application area.
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