SM152 Product Specification

SM 152
Diaphragm safety valve
for closed water heaters
Product specification sheet
Application
Type SM 152 diaphragm-type safety valves are used to protect
pressurised water heaters according to the requirements of DIN
4753, Part 1 and DIN 1988.
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.
The unique Honeywell Braukmann
facility enables
the valve to be serviced without removal from the pipework.
Special Features
● Tested to TRD 721
● Easy venting
● Replacement insert makes servicing simple
●
– can be serviced without removal from
the pipework
Construction
● Angled housing
● Safety valve exchange insert, approved and
comprising:
❍ Screw-in section with hexagon
❍ Spring bonnet
❍ Security cap with certification and rating plate
❍ Venting knob
❍ Sealing disc
❍ Diaphragm
❍ Setting spring
Materials
● Brass housing
● High grade synthetic material screw-in section (for up to
6.0 bar set pressure) or brass (for set pressures above
6.0 bar)
● High grade synthetic material spring bonnet
● High grade synthetic material security cap
● High grade synthetic material venting knob
● Complies with KTW requirements
● Standardised discharge connection
Range of Application
For closed water heaters in compliance with DIN 4753, Part 1
and DIN 1988. Tested to TRD 721 for pressure range 1.0 bar to
10.0 bar.
Medium
Water
Technical Data
Installation position
Horizontal with spring bonnet upwards
Set pressure
Set by manufacturer at 6.0, 8.0 or
10.0 bar.
Special settings between 1.0 bar and
10.0 bar are also available.
Subsequent alteration of the setting is
not permitted and is impossible
without destroying the security cap.
Operating temperature Maximum 95° C
Connection sizes
1 2
/ ” to 11/4”
Valve size is defined by the size of the inlet connection.
● Hot water resistant elastomer seal disc
● Hot water resistant elastomer diaphragm
● Spring steel setting spring
Subject to change 08/98
9
Method of Operation
R
SM 152 diaphragm-type safety valves are direct-acting safety
valves in which the disc is pushed up by the pressure from the
system against a spring which is holding the valve closed. If the
opening force exceeds the force exerted by the spring, then the
valve disc is lifted off the valve seat and the valve discharges
the medium. In accordance with the requirements of the
standard, the full discharge capacity of the valve will be
achieved when the system pressure climbs to no more than
10% above the set pressure of the valve. Full shutoff must be
achieved if the system pressure falls to below 80% of the nominal set pressure of the valve. For valves rated up to 3.0 bar, the
closing pressure can be taken as 0.6 bar minimum.
▲
Options
▲
H
▲
▲
h
SM 152- … AA = Not chrome plated, set pressure 6.0 bar
SM 152- … AB = Not chrome plated, set pressure 8.0 bar
SM 152- … AC = Not chrome plated, set pressure 10.0 bar
SM 152- … BA* = Chrome plated, set pressure 6.0 bar
SM 152- … BC* = Chrome plated, set pressure 10.0 bar
▲
▲
▲
▲
▲
▲
▲
▲
DoØ
R
l
* 1/2" connection size only
put in R Inlet
Special versions available on request
Connection sizes
Inlet
Outlet
Dimensions (mm)
R
R
1 2
/“
3/4“
3 4
/“
1“
1“
11/4“
11/4“
11/2“
H
87
91
123
130
h
23
28
40
47
l
36
42
50
55
ø Do
14
14
18
18
For water heaters with
capacity (litres)
up to 200
up to 1000
up to 5000
over 5000
Maximum permissible
heat input (kW)
75
150
250
2200
1
3
.
.
.
.
.
(6-10 bar)
TÜV Approval Nos.
TÜV SV 93 - 617 ( /2“ + /4“, 1“) W p
(1-10 bar)
TÜV . SV . 93 - 616 . 11/4“ . W . 2200 · p
TÜV . SV . 92 - 700 . (1/2“ + 3/4“) . W . p
(1-6 bar)
10
Honeywell AG · Braukmann-Armaturen
Subject to change
08/98
Installation Example
Installation Guidelines
Typical Applications
● The safety valve must be installed in the cold water
supply pipework before the water heater.
Diaphragm safety valves are installed in accordance with their
specification upstream of water heaters. The following are
some typical uses
● The installation must be carried out so that:
❍ There are no shutoff valves or fittings, narrowing of
the pipework or strainers between the water heater
and the safety valve.
❍ Good access is provided for service and
maintenance.
❍ The safety valve is fitted above the top of the water
heater to avoid the need for draining down when
exchanging the safety valve insert.
❍ If there is no drainage facility in the room where the
heater is installed, then the safety valve may be fitted
in an adjacent area.
● Central hot water supply systems
● Hot water storage units
Inspection and 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
and test
Check operation: Vent the valve during normal operation
of the system. The discharged water should run away
properly and the valve then fully shut off when released.
Every six months
User or specialist
Maintenance
If the valve does not function properly, venting several
times may correct the situation. If not, a full overhaul of
the valve will be necessary.
Annually
Specialist
Subject to change
08/98
Honeywell AG · Braukmann-Armaturen
11
Spare Parts for SM 152 Diaphragm Safety Valves
(From 1981 onwards)
Description
① Safety valve insert
Approval No.
Approval No.
Approval No.
6.0 bar
①
8.0 bar
10.0 bar
Nominal Size
Part No.
TÜV . SV . 83/88/93 - 617- 1/2” + 3/4”. W . p
TÜV . SV . 83/88/93 - 617- 1” . W . p
TÜV . SV . 83/88/92 - 700- 1/2” + 3/4”. W . p
1
/2“ + 3/4“
A 152 - 3/4 AA
1“
A 152 - 1 AA
1
/2“ + 3/4“
A 152 - 3/4 AB
1“
A 152 - 1 AB
1
/2“ + 3/4“
A 152 - 3/4 AC
1“
A 152 - 1 AC
Safety valve insert
with chrome plated body
Approval No.
TÜV . SV . 83/88/93 - 617- 1/2” + 3/4”. W . p
1
8.0 bar
/2“ + 3/4“
A 152 - 3/4 BB
1
3
10.0 bar
/2“ + /4“
A 152 - 3/4 BC
Safety valve insert
Approval No.
6.0 bar
8.0 bar
10.0 bar
Subject to change
08/98
Honeywell AG
P.O. Box 1347 · D-74819 Mosbach (Germany)
(+49) 0 62 61/8 10 · Fax (+49) 0 62 61/8 13 09
☎
12
TÜV . SV . 83/88/93 - 616- 11/4”. W . (2200) · p
11/4“
A 160 - 1 AA
11/4“
A 160 - 1 AB
11/4“
A 160 - 1 AC
Download PDF