Safety group with pressure reducing valve
for pressurised hot water storage units up to 200 litres
6.
Construction
The safety group comprises:
•Housing
• Shutoff valve
• Check valve with test plug
• Approved safety valve
• Tundish and trim plate
• Chrome-plated connection pipes
• Pressure reducing valve
Materials
• Chrome-plated hot-pressed brass housing
• High-quality synthetic material check valves
• High quality synthetic material test plug
• Chrome-plated hot-pressed brass safety valve housing
• High quality white synthetic material tundish and trim plate
• Chrome-plated brass connection pipework
• Chrome plated brass pressure reducing valve housing
EN0H-1305GE23 R0807 • Subject to change
SG162D
Product specification sheet
Application
Safety groups of this type are 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 downstream 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.
Special Features
• Check valve is DVGW approved
• Safety valve is TÜV approved
• Easy venting
• Can be fitted on the left or right
• Pressure reducing valve with inlet pressure balancing - inlet
pressure fluctuation does not influence the outlet pressure
• Housing and connection pipes are chrome plated
• Meets KTW recommendations for potable water
• Certified to Pressure Equipment Directive 97/23/EC, Reference No. CE 0035
Range of Application
For closed hot water storage units up to 200 litres according to
DIN 4753 Part 1 and DIN 1988. Tested to TRD 721 for 1.0 to 10.0
bar pressure range.
Medium Water
Inlet pressure Max. 16 bar
Outlet pressure 4 bar
Operating pressure Maximum at least below 20 % opening
pressure of safety
Technical Data
Opening pressure Set by manufacturer at 6.0, 8.0 or 10.0 bar
Subsequent alteration of the setting is not
permitted and is impossible without
destroying the security cap
Operating temperature
Connection size
Clearance from wall 70 mm and 100 mm
Max. 70 °C
1
/2"
www.honeywell.com 27
SG162D Safety group with pressure reducing valve
Method of Operation
Safety group integrates a check valve, shutoff valve, test point,
diaphragm safety valve and pressure reducing valve in one
appliance.
Water from the inlet water supply first enters the pressure reducing valve. This functions on a force equalising system - the force
of a moving piston operates against the force of an adjustment
spring. The inlet pressure has no influence on the opening or
closing of the valve. Inlet pressure fluctuations therefore have no
influence on the outlet pressure. The check valve has a moving
valve disc and flow pushes this open against the force of a
spring. The downstream safety valve is a direct operating safety
valve - the opening force operates against the force of a spring.
The downstream safety valve is a direct operating safety valve.
That is, the opening force operates against the force of a spring.
Options
SG162D-1/2A = Safety valve opening pressure 6.0 bar
SG162D-1/2C = Safety valve opening pressure 10.0 bar
Connection size R
1
/2" a) Shutoff valve
Nominal size diameter DN 15 b) Test plug for check valve
Dimensions (mm)
L
H
h
100
100
100
c) Check valve
d) Diaphragm-type safety valve with venting device (replaceable)
e) Tundish (no special vapour trap required)
f) Pressure reducing valve
28 www.honeywell.com
EN0H-1305GE23 R0807 • Subject to change
Installation Example
SG162D Safety group with pressure reducing valve
Installation Guidelines
• Safety group must be fitted in the cold water supply to the hot
water storage unit
• The installation must be carried out so that:
o There are no shutoff valves or fittings, narrowing of the
pipework or strainers between the water heater and the
safety valve
o Good access is provided for service and maintenance
• For safety reasons, during heat up water may emit from the
discharge pipework
Do not close!
Typical Applications
Safety groups of this type are installed within the scope of their
specification on the inlet to hot water storage units of up to
200 litres nominal capacity
The pressure reducing valve is necessary:
• If the inlet pressure is greater than 80% of the safety valve set
opening pressure
The following are some typical applications:
• Closed hot water storage units
• Reverse calorifiers
• It is important that no attempt be made seal off the pipework
to stop this discharge!
Maintenance
In accordance with DIN 1988, Part 8, the following operations should be carried out regularly. A planned maintenance scheme is
recommended.
Operation Interval Carried out by
Inspection Pressure reducing valve: Visual inspection on pressure gauge of the set
Annually User or specialist
outlet pressure at zero flow and at peak flow (large take off).
Check valve: Check operation by opening the test point and closing the
Annually User
lower shutoff valve.
Safety valve: Check operation as follows: With the system operating,
Every six months User or specialist
open the venting device. The resulting water flow must fully drain away.
When the ventil is released,the valve must fully close.
Maintenance Pressure reducing valve: If no stable outlet pressure can be established
at zero flow during the visual inspection, the pressure reducing valve
insert should be removed for checking and if necessary be replaced.
Every 1 to 3 years
depending on
system operating
Specialist
conditions
EN0H-1305GE23 R0807 • Subject to change
manual opening and closing of the valve. If this method does not
Safety valve: If a malfunction occurs,this may be cured by repeated
Annually Specialist
succeed, then an overhaul of the valve will be necessary.
www.honeywell.com 29
SG162D Safety group with pressure reducing valve
2
3
4
1
3
6
5
Spare Parts
Safety Group SG162D, from 1998 onwards
No. Description Dimension Part No.
1 Safety valve exchange
3
Approval No. - TÜV · SV · ..* - 771 6 bar
10 bar
1
/2" A162-BA
1
/2" A162-BC
..* valid Approval No.
2 Flanged offset angled
1
/2" 2596600
tube
3 Connection set
1
/2" 0900625
complete
4 Angle tube O
5 Tundish
6 Pressure reducing
1
/2" 2597200
1
/2" 0901768
1
/2" D162-1/2A
valve
1
/2"·W·p
Automation and Control Solutions
Honeywell GmbH
Hardhofweg
D-74821 Mosbach
Phone: (49) 6261 810
Fax: (49) 6261 81309
http://europe.hbc.honeywell.com
www.honeywell.com
Manufactured for and on behalf of the
Environmental and Combustion Controls Division
of Honeywell Technologies Sàrl, Ecublens, Route
du Bois 37, Switzerland by its Authorised Representative Honeywell GmbH
EN0H-1305GE23 R0807
Subject to change without notice
© 2007 Honeywell GmbH
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