Tognella - page 23

23
IN LINE SINGLE-ACTING CONTROL VALVES
Their function is to control and, if necessary, to shut-off the flow in one
direction, allowing a free return flow in the opposite direction. Appreciated for
their aesthetic characteristics, they are a reliable solution.
The suitable dimensioning has made possible to obtain, in a little space, a great
mechanic resistance of the components. The spring in high-resistance material
is housed in such a way that it does not close as a pack during the opening of
the single-acting conical valve poppet.
Like all the valves of the series FT 257 they ensure:
• metallic seal;
• flow linearity at the opening;
• accurate control for a wide range of flow rate,
thanks to the double reference system
• wide range of the flow rate control;
• impossibility for the needle to leave its seat even in the max.
opening position;
• stable positioning thanks to a dowel inside the knob;
• quickness in the assembling of the panel (the ring nuts (G)
are supplied on request).
The check valve is calibrated at 0,5 bar.
On request
• Versions AISI 316 code FT 2257/5
• Viton seals (V)
• NPT threads
• Equipped with ring nuts (G)
• Knob in ABS (mp)
• Lobes aluminium die-cast handwheel (RA)
TECHNICAL DATA
TYPE
Flow
section cm 2
Working
pressure bar
Min. bursting
pressure bar
Working
temperature
Filtration grade
µ
m
18
0,12
400
1600
-20°/+100°
25
14
0,19
400
1600
-20°/+100°
25
38
0,39
400
1600
-20°/+100°
25
12
0,68
400
1600
-20°/+100°
25
34
1,13
400
1600
-20°/+100°
25
100
2,09
320
1300
-20°/+100°
25
114
2,09
320
1300
-20°/+100°
25
112
3,14
320
1300
-20°/+100°
25
200
4,91
320
1300
-20°/+100°
25
FT 257/5
EXAMPLE FOR ORDERING
Code
Type Pannel ring
nut
Viton seal Knob
in plastic
FT 257/5 18 G
V
mp
Stainless
steel
FT 2257/5 34 G
mp
Steel
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