AUTOMATIC FILLING VALVES AUTOMATIC ... - Watts Industries

01C301-GB
AUTOMATIC FILLING VALVES
AUTOMATIC FILLING UNITS
RELIABILITY
AND COMFORT
The Watts Cazzaniga ALIMAT automatic
filling valve ensures prompt automatic
make up of water losses from the
heating system by highly accurate
and reliable adjustment of the heating
system pressure until reaching the
required operating parameter.
EASY FILLING
The use of the Watts Cazzaniga ALIMAT filling valve allows fully
automatic filling of water in the system with appreciable time
saving.
PROTECTION
The Watts Cazzaniga ALIMAT automatic filling valve includes an
inspectable check valve whose function is to prevent risk of back
flows which could cause contamination of the water main with the
water of the heating system. When an even higher level of safety is
required, Watts Intermes offers filling and back flow preventer units
for systems with capacities either higher or lower than 70 kW.

APPLICATION
A closed circuit heating system should be connected to
the water main via a valve ensuring the following conditions:
- a filling pressure suitable for system requirements;
- protection against risk of back flow which could cause
pollution of the water main;
- stop of water filling upon reaching a preset pressure.
Such conditions are guaranteed by the ALIMAT automatic
filling valve which combines the following functions:
- pressure control;
- non-return;
- checking for correct check valve operation;
- shut-off ;
- filtration;
- check of heating system pressure via pressure gauge.
1
2
3
E U
10
4
Overall dimensions (mm)
AL - ALM - ALO - ALOM
Key:
1. Inlet connection
2. Setting pin
3. Spring
4. Plug
5. Diaphragm
6. Check valve
7. Vent
8. Knob
9. Filter cartridge
10. Chamber
TECHNICAL CHARACTERISTICS
Max. inlet pressure 10 bar
Set pressure 0,3 to 4 bar
Max. flow rate 1,8 m3/h
Operating sensitivity 0,2 bar
Max. fluid temperature 40°C
5
6
7
9
8
6
AL
ALIMAT.
Automatic filling valve
complete with check valve,
manual shut-off, stainless
steel filter, vent screw.
ALM
Like AL but with pressure
gauge MR50 (dial 50 mm,
radial connection, 0-4 bar).
Flow rate - pressure drop chart
PRESSURE DROPS
[bar]
4
3,5
3
2,5
2
1,5
1
0,5
0
Part No. Size
0240100 1/2”MF
Part No. Size
0240200 1/2”MF
ALO
Part No. Size
Like AL but with cap made of
brass CW617N. 0240110 1/2”MF
ALOM
Like ALO but with pressure
gauge MR50 (dial 50 mm,
radial connection, 0-4 bar).
FLOW RATES
Part No. Size
0240210 1/2”MF
DESIGN FEATURES
Body and head end Nickel-plated brass
Body Shot-blasted stamped brass
Diaphragm NBR rubber reinforced with nylon fabric
Inlet connection 1/2" M tailpiece (UNI-ISO228/1)
Outlet connection 1/2" F (UNI-ISO228/1)
Gauge connection 1/4" F (UNI-ISO228/1)
O-rings NBR rubber
Cap (AL-ALM) High impact plastic
Cap (ALO-ALOM) Die-cast brass
0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 [ m 3 /h]

In order to avoid uncontrollable feeding of water in the
system, which would prevent leak detection, it is recommended,
once filling has finished, to close the shut-off
valve. The pressure gauge will show any leaks which,
whenever of continuous nature, should be promptly
identified and eliminated.
OPERATION
When the pressure exerted by the fluid inside the system
drops below the pressure exerted by spring (3) on diaphragm
(5), the spring pushes plug (4) down. The mains
water flows via inlet (E) through filter cartridge (9), then
rises into chamber (10), opens check valve (6) and thus
flows towards the system (U). When filling of the system
is complete, the pressure in it increases, and therefore in
chamber (10). After exceeding the value balanced by the
force exerted by the opposing spring the pressure pushes
diaphragm (5) upwards while plug (4) closes. Check
valve (6) prevents back flow. Hence the pressure settles
according to the set pressure given by the spring.
SETTING
The ALIMAT automatic filling valve is set by turning screw (2):
- towards + (clockwise) = to increase the pressure;
- towards - (counter-clockwise) = to decrease the pressure.
Pressure of the system can be checked on the pressure
gauge.
APPLICATION
Risk of pollution of drinking water pipes is a factor not be
underestimated.
There are regulations prescribing preventive measurements
against contamination of drinking water: among
these, UNI 9157 - "Three-way back flow preventers" lists
the circuits and/or appliances whose direct connection to
the public water main is recognized as possible source of
pollution; hence the use of a back flow preventing unit is
prescribed:
- independent and central heating systems;
- air conditioning and air treatment systems.
In order to protect public drinking water mains, a filling
and back flow preventing is a useful device for connection
to the heating system.
This unit combines both functions of protection and
automatic feeding of the system.
APPROVALS
The following approvals refer to the back flow preventers
only:
- DIW009:
UNI certification according to UNI 9157
standardCertifications
NF/ANSEAU/KIWA/DVGW/ASSE/AWWA/IAPMO
- DNW9D:
Certifications ANSEAU/KIWA/ASSE/CSA
CONTROL OF CHECK VALVE FOR PRESSURE
TIGHTNESS
The ALIMAT automatic filling valve is able to control the pressure tightness of
the check valve. For such purpose, after closing knob (8), slightly loosen (2 or 3
turns) vent screw (7): if there is faulty sealing of the check valve, there would be
a continuous loss of water. After controlling, fully tighten the vent screw and
again open the knob.
MAINTENANCE
La manutenzione dell’alimentatore automatico ALIMAT si limita alla pulizia periodica
del filtro, in particolare dopo il primo riempimento dell’impianto.
Per estrarre il filtro procedere come segue:
1. Close the gate valve upstream to ALIMAT (if there is no gate valve, shut off the
supply pipe from the water main).
2. Unscrew the bottom nut and remove the knob assembly (8) where filter (9)
is seated.
3. Flush the filter with water (do not use aggressive chemicals).
4. Grease the O-rings mounted on plug (4).
5. Refit the filter and spring in the seat in the bottom nut, then fully tighten the
nut to the body.
6. Re-open the gate valve upstream to ALIMAT or the one before the system.
ALOMDIW
Filling and back flow preventing
unit, complete with
discharge tundish, assembled
for air conditioning and heating
systems with capacity
> 79 kW.
ALOMDNW
Filling and back flow preventing
unit, complete with
discharge tundish, assembled
for air conditioning and heating
systems with capacity
< 70 kW.
Part No. Size
1505199 1/2”
Part No. Size
1505299 1/2”
DESIGN FEATURES
Ball valve body Nickel-plated stamped brass
Ball valve seats PTFE
Inlet connection 1/2" F (UNI-ISO228/1)
Outlet connection 1/2" F (UNI-ISO228/1)
Gauge connection 1/4" F (UNI-ISO228/1)
TECHNICAL CHARACTERISTICS
Max. inlet pressure 10 bar
Set pressure 0.3 to 4 bar
Max. flow rate 1.8 m3/h with set pressure 4 bar
Operating sensitivity 0.2 bar
Max. fluid temperature 40°C

Flow rate - pressure drop chart
PRESSURE DROPS
[bar]
Overall dimensions (mm)
4
3,5
3
2,5
2
1,5
1
0,5
0
0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 [ m 3 /h]
FLOW RATES
ALOMDIW ALOMDNW
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding.
WATTS CAZZANIGA reserves the right to carry out any technical and design improvements to its products without prior notice.
WATTS Cazzaniga S.p.A.
Via Parco, snc - 20046 Biassono (MI) - Italy
Phone ++39 039 49.86.1 - Fax ++ 39 039 49.86.285
www.wattseurope.com e-mail: info@wattscazzaniga.it
ALOM DIW
ALOM DNW
G1- AL- DIW - DNW - GB - 01/’02