MATERIALS

Body 9S Mn Pb 23 - UNI 5105

FT 257/6

Check valve 38 Ni Cr Mo 4 - UNI - EN 10083

Spring C72 UNI 3545
Threaded found. 35 S Mn Pb 10 - UNI 5105

EXAMPLE FOR ORDERING

Code Type Calibration

Steel FT 257/6 14 –
Stainless FT 2257/6 12 –
steel
Steel FT 257/6/8 34 8

DIMENSIONS

A
TYPE B C CH Weight k g
UNI 338
18 1/8”G 8,5 46 17 0,075
14 1/4”G 12,5 63 22 0,165
38 3/8”G 12,5 68 27 0,260
12 1/2”G 15,5 80,5 32 0,415
34 3/4”G 17 99,5 36 0,605
100 1”G 20 117 46 1,170
114 11/4”G 22 134,5 55 1,850
112 1 1/2”G 24 159 65 3,130
200 2”G 27 198 75 4,900

26
CHECK VALVES (PISTON)

They are inserted in branches of the circuit where the free flow
in one direction is allowed and the return flow in the opposite direction

FT 257/6
is not possible. A lasting and hermetic seal is ensured by the conical
valve poppet, which is a reliable mechanical solution.
The spring in high-resistance material is housed in such a way that
it does not close as a pack during the opening phase. The external
configuration of the body makes it easy to seize the piece
during the assembling.
They are available with different calibrations of the load pressure
(0,5 standard and 2-4-6-8-10 bars).

On request
• Versions AISI 316 code FT 2257/6
• NPT threads

TECHNICAL DATA

Working Min. bursting Working Filtration

TYPE grade µm
pressure bar pressure bar temperature C°
18 400 1600 -20°/+100° 25
14 400 1600 -20°/+100° 25
38 400 1600 -20°/+100° 25
12 400 1600 -20°/+100° 25
34 400 1600 -20°/+100° 25
100 320 1300 -20°/+100° 25
114 320 1300 -20°/+100° 25
112 320 1300 -20°/+100° 25
200 320 1300 -20°/+100° 25

27
 bar
FT 257/6 - 18
25

20

15 -18/6

PRESSURE DROP ∆p
-18/4 -18/8
10

5 Oil 3,2°E ÷ 50°C

-18/0,35
FT 257/6

-18/2
0 10 12 14 16 18 20 22 24 26 28
l/min
FLOW RATE Q

bar
FT 257/6 - 14
12 -14/8

10

8 -14/6

PRESSURE DROP ∆p
6 -14/4

4 -14/0,35
-14/2
2 Oil 3,9°E ÷ 50°C

0 5 10 15 20 25 30 35
l/min
FLOW RATE Q
bar
FT 257/6 - 38

10
-38/8

8
-38/6

6
PRESSURE DROP ∆p

-38/4
4
-38/2 -38/0,35
2
Oil 3,9°E ÷ 50°C

0 10 20 30 40 50
l/min
FLOW RATE Q
bar
FT 257/6 - 12

10 -12/8

8 -12/6

6
PRESSURE DROP ∆p

-12/4
4
-12/2
-12/0,35
2
Oil 3,9°E ÷ 50°C

0 10 20 30 40 50 60 70 80
l/min
FLOW RATE Q
bar
FT 257/6 - 34

10 -34/8

8 -34/6

6
PRESSURE DROP ∆p

-34/4
4
-34/2
2 -34/0,35
28
Oil 3,9°E ÷ 50°C
0 10 20 30 40 50 60 70 80 90
l/min
FLOW RATE Q
 FLOW RATE
bar
FT 257/6 - 100 Oil 3,9°E ÷ 50°C
-100/8
10

8
-100/6
CURVES
6 -100/4
PRESSURE DROP ∆p

-100/2
2
-100/0,35

FT 257/6
0 20 40 60 80 100
l/min
FLOW RATE Q
bar
FT 257/6 - 114

10
-114/8
8
-114/6
6
PRESSURE DROP ∆p

-114/4
4
-114/2
2
-114/0,35
Oil 3,9°E ÷ 50°C

0 200 250 300 350 400

l/min
FLOW RATE Q
bar
FT 257/6 - 112

10

6
PRESSURE DROP ∆p

2
Oil 4°E ÷ 50°C

0 100 200 300 400 500 600 700

l/min
FLOW RATE Q
bar
FT 257/6 - 200

4
PRESSURE DROP ∆p

Oil 4°E ÷ 50°C

0 100 200 300 400 500 600 700 800 900

l/min
FLOW RATE Q

29