Honeywell SM120 PRODUCT DATA
SM120
Diaphragm Safety Valve
FOR CLOSED HEATING INSTALLATIONS
PRODUCT DATA
Application
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.
Features
• For heating systems to DIN 4751
• Construction tested to TRD 721
• Protected against subsequent resetting
• For large output systems up to three valves can be
fitted in parallel with separated discharges
• With venting facility
Design
The safety valve comprises:
•
Housing
•
Spring bonnet
•
Diaphragm
•
Seal disc
•
Venting knob
Materials
•
Brass housing and spring bonnet
•
Hot water resistant elastomer diaphragm and seal disc
•
High quality synthetic material venting knob
Range of Applicati on
Closed heating or solar systems. Not suitable for water
storage heaters.
Specifications
Flow temperature
Capacity
Connection size
NOTE: The valve size is determined by the size of the inlet
connection.
max. 120°C (248°F)
50–350 kW
000–300 000 kcal/h)
(45
R 1/2" to R 1 1/4"
Copyright © 2001 Honeywell AG • All rights reserved (EN0H-1324GE23 R0401)
SM120
Dimensions
Fig. 1. Dimensions
NOTE: All dimensions in mm unless otherwise stated.
Function
The diaphragm safety valve is normally closed. If the
pressure in the boiler exceeds the set pressure of the safety
valve, then the force against the valve disc exceeds the force
exerted by the spring and the valve opens.
Versions
SM 120 - . . . A=Set pressure 2.5 bar,
for closed heating systems
SM 120 - . . . B=Set pressure 3.0 bar,
for closed heating systems
Connections Dimensions Weight
Inlet Outlet H h l D
1/2" 3/4" 93 28 36 15 0,3 50 45 000 SM 120 - 1/2 A
3/4" 1" 99 34 42 16 0,4 100 90 000 SM 120 - 3/4 A
1" 1 1/4" 137 41 51 22 0,9 200 175 000 SM 120 - 1 A
1 1/4" 1 1/2" 144 47 57 27 1,1 350 300 000 SM 120 - 1 1/4 A
1/2" 3/4" 93 28 36 15 0,3 50 45 000 SM 120 - 1/2 B
3/4" 1" 99 34 42 16 0,4 100 90 000 SM 120 - 3/4 B
1" 1 1/4" 137 41 51 22 0,9 200 175 000 SM 120 - 1 B
1 1/4" 1 1/2" 144 47 57 27 1,1 350 300 000 SM 120 - 1 1/4 B
0
kg
kW kcal/h OS-No.
Set pressure 2,5 bar
Set pressure 3,0 bar
Home and Buil ding Control
Honeywell AG Phone: (49) 6261 810
Hardhofweg Fax: (49) 6261 81309
D-74819 Mosbach braukmann@honeywell.com http://europe.hbc.honeywell.com
(EN0H-1324GE23 R0401) 2 Subject to change • All rights reserved
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