OMC RE20 - Tight Shut Close (TSHUT CL)

48
Installation
,
O
p
eration and Maintenance Manual ManRE20en Rev.06/2022
OMC S.p.A: Via G. Galilei, 18 - 20060 - Cassina de Pecchi (MI) - ITALY - www.omcvalves.com - Tel.: (+39) 02.95.28.468
8.9.9 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.