Smart Positioner
YT-3100
Product Manual
Ver. 1.19
50
9.9.9
Tight Shut Close (TSHUT CL)
It is used to ensure that the valve is fully closed with a large force. When the input signal SP is smaller
than the value set in the TSHUT CL, air pressure is vented through OUT 1 port to tightly close the
valve. If the input current of 4 mA is 0 % of valve position and 20 mA is 100 % of valve position, and
the Tight Shut Close value is set to any position larger than 0 % (e.g. 5 %), then the valve stroke will
be 0 % immediately when the input signal goes below the set value (e.g. 5 %). The air venting from
the actuator via the OUT1 port prevents leakage of the valve by shutting the valve tightly. However,
when the value is set to 0 %, Tight Shut Close function doesn’t work.
3 seconds
→
→
→
Press <UP> or
<DOWN> button
if the above is not
displayed.
Press <UP> or
<DOWN> button
if the above is not
displayed.
<UP>/<DOWN>
→
<ESC>
3 times
→
The following graph shows the operation of the valve stroke when the input signal corresponding to
Tight Shut Open or Tight Shut Close is applied to the device.
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
V
alv
e
Str
ok
e
[%
]
Input current [%]
