User guide

21-13
Safety Groups
16
17
18
19
20
21
22
24
23
25
26
27
28
SG162D safety groups are safety controls to DIN 4753 Part 1 and DIN 1988 for the protection of
pressurised hot water storage units with capacities up to 200 litres. They are composite assemblies
which integrate in one unit all necessary safety components, including check valve, shutoff valve, test
point and diaphragm-type safety valve. The safety valve protects the down-stream cylinder, pressure
vessel etc. by automatically opening when excess pressure occurs. The check valve prevents back
pressure, backflow and back syphonage of water from the hot water unit. In addition, a balanced-seat
pressure reducing valve is fitted on the inlet and this reduces the pressure from the inlet supply to the
pressure required for the system. It also prevents uncontrolled dripping from the safety valve when the
inlet pressure fluctuates.
Safety valve opening pressure 6,0 bar
Safety valve opening pressure 10,0 bar
Spare Parts
Safety group with pressure reducing valve for pressurised hot water storage units up
to 200 litres, SG162D
Approvals TUEV approved, certified to Pressure Equipment Directive 97/23/EG,
Reference No. CE 0035.
Media Water
Body material brass, dezincification resistant
Body finishing chrome plated
Port diameter 1/2 inch
DN size 15 mm
Max. media temperature 70
o
C
Balanced seat design yes
Additional description For closed hot water storage units up to 200 litres according to DIN
4753 Part 1 and EN 1717. Tested to TRD 721 for 1.0 to 10.0 bar
pressure range.
• The venting device can be easily serviced
• Can be fitted on the left or right
• Housing and connection pipes are chrome plated
• The pressure reducing valve can be retro fitted
• The pressure reducing valve provides inlet pressure compensation
- inlet pressure fluctuations have no influence on the outlet
pressure
Set pressure Type
bar
6 SG162D-1/2A
Set pressure Type
bar
10 SG162D-1/2C
Safety valve insert, set pressure 6 bar
A162-BA
Safety valve insert, set pressure 10 bar
A162-BC
Pressure reducing valve
D162-1/2A