3
Watts Water Technologies, Inc.
Operation
Installation
Chart
1000
500
200
100
10
20
50
100
200
500
1.000
2.000
5.000
10.000
20.000
50.000
DN32
DN25
DN15
PRESSURE DROP
100
200
500
1000
2000
5000
10000
50000
3
5
10
20
50
100
200
500
1000
DN20
DN40
DN50
DN65
DN80
FLOW RATE
[
mm c.a.
]
Q (kg/h) - Gasolio
Q (kg/h) - Olio combustibile
(3÷5 °E)
Q (Nm
3
/h) - Metano
(d=0,583)
When the setpoint temperature is reached, the heat-sensitive element
(4)
causes the grooved piston supporting the stem with
integral disc
(2)
to move, causing the stem to drop, thus closing the valve. Valve closing is not gradual: the valve snaps shut
when the setpoint temperature is reached, so the fuel flow is not throttled. It is not possible to reset the valve until the water
temperature has fallen below 85°C.
1
2
3
5
6
4
Characteristics
1) Resetknob
2) Disc
3) Cover
4) Heat-sensitive element
5) Valve body
6) Sheath
Install the fuel shut-off valve on the fuel supply pipe between the filter and the burner, in the direction shown by the arrow cast
into the valve body. The valve's heat-sensitive element “must be immersed in the outward flow of hot water, close to or at the
top of the boiler, or in the outlet pipe within 1m of the boiler, upstream of any shut-off device” (R.2.A.4.2)
(Fig.1)
. Weld the sheath
sleeve so that the sheath is immersed as fully as possible in the hot water, in one of the positions specified above. Depending
on the diameter of the pipe, the sleeve can be welded perpendicular or at an inclined angle in relation to the pipe
(Fig.2)
or on
a bend where possible
(Fig.3)
.
Fig.2
Fig.1
Flow rate - pressure drop
Fig.3
