User guide

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Safety Controls
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The SM120 diaphragm safety valve provides the last line of security for heating systems if the
prescribed safety controls fail. In an emergency they must therefore have the capacity to discharge the
whole contents of a cylinder in the form of steam. In normal system use they do not come into
operation.
For hydronic heating systems to DIN 4751.
SM120 with 2,5 bar set pressure for closed heating systems
SM120 with 3,0 bar set pressure for closed heating systems
Membrane safety valves of this type are used to protect closed hot drinking water systems according
to DIN 1988 and DIN 4753-1.
In accordance with statutory requirements, the diaphragm safety valve is preset to the required fixed
set pressure by the manufacturer and is sealed with an embossed security cap marked with the test
badge and pressure rating to prevent unauthorised tampering with the setting. Subsequent alteration
of the setting is not permitted and is impossible without destroying the security cap. The preset
pressure is embossed on the security cap.
Diaphragm safety valve for closed heating and solar installations, SM120
Approvals Construction tested to TRD 721
Materials Brass housing and spring bonnet with hot water resistant
elastomer diaphragm and seal disc; high quality plastic venting
knob
Media water
Max. media temperature 120
o
C
Port connection type internal threads
Plant output Type
50 kW (45.000 kcal/h) SM120-1/2A
100 kW (90.000 kcal/h) SM120-3/4A
200 kW (175.000 kcal/h) SM120-1A
350 kW (300.000 kcal/h) SM120-11/4A
Plant output Type
50 kW (45.000 kcal/h) SM120-1/2B
100 kW (90.000 kcal/h) SM120-3/4B
200 kW (175.000 kcal/h) SM120-1B
350 kW (300.000 kcal/h) SM120-11/4B
Diaphragm safety valve for closed hot drinking water systems, SM150
Approvals Certified to Pressure Equipment Directive 97/23/EC, Refe-rence
No. CE 0036
• Meets KTW recommendations for potable water
Media The membrane safety valve is only suitable to drain drinking water
from closed hot drinking water systems according to DIN 1988
and DIN 4753-1 for protection against exceeding pressure
• Water
Materials Brass housing; spring steel adjustment spring; high grade
synthetic material security cap; hot water resistant elastomer
diaphragm
Mounting position horizontal
Max. media temperature 95
o
C
Port connection type internal threads
Additional description • Opening pressure factory preset to 6.0, 8.0 or 10.0 bar
• Standardised discharge connection
• With lifting device
• Protected against subsequent changing of the default settings