Watts Industries Italia S.r.l.
Via Brenno, 21 • 20853 Biassono (MB) • Italy
Tel. +39 039 4986.1 • Fax +39 039 4986.222
[email protected] • www.watts.com
© 2018 Watts
The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding.
Watts Industries reserves the right to carry out any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly
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terms, contained in any buyer communication in any form, unless agreed to in a writing signed by an officer of Watts.
NVFN-TS-IT-W-UK-11-18-Rev.2
Fitting
NVFN Series
Liquid and gas fuel shut-off valve FLAMSTOP
NVFN Series
– WATTS brand. Positive action with manual resetting. Liquid
expansion thermostat. Capillary length 5m. Compact sensor. Aluminium body, stainless steel springs. NBR seals (FPM on
1/2” and 3/4” versions). 1/2”M sensor sheath connection (with 1/2”F x 3/4”M nipple). Setpoint temperature 97°C±3°C. Max.
operating pressure: 6 bar (DN 15-25) - 1 bar (DN 32-80). Max. temperature, sensor side 120°C. Maximum temperature, valve
side 50°C. 1/2” and 3/4” versions suitable for biodiesel. INAIL approved and set. Compliant with Directives PED 2014/68/EU
and ATEX 2014/34/EU.
DN
L
H
H1
1/2”
70
155
138
3/4”
70
163
141
1”
90
196
169
1.1/4”
150
204
169
1.1/2”
150
204
169
2”
170
222
179
1/2”
H
D
H1
D
52,5
L
500
0
DN
L
H
H1
65
260 310 200
80
310 351 234
1/2”
H
D
H1
D
52,5
L
500
0
To reset the valve, proceed as follows:
A)
Release the black protective cap;
B)
Pull the green reset knob up;
A)
Re-engage the black protective cap.
To make sure the valve is open, check that the green reset knob appears in the top inspection window on the protective cap.
A
C
B
To fit the
NVFN Series
fuel shut-off valve, proceed as follows:
1. Screw the sheath of the heat-sensitive element onto the sleeve;
2. Insert the bulb of the heat-sensitive element fully into the sheath;
3. Connect the valve to the burner supply pipe in accordance with the direction of flow shown on the valve body;
4.
Carefully unroll the copper capillary, making sure that it is not resting on hot parts or the boiler
doors;
5. Push the plastic protective bushing on the end of the capillary into the sheath, then tighten the screw on the hexagonal
head of the sheath.
N.B.
You can turn the control device on the cap through 360° to make it easier to fit the valve and lay out the capillary.
Specification text
Overall dimensions (mm)
Resetting the valve
