XS Position Switch

1. Ask the person that approved the drawing for issue. It might be a typo, in which case that individual might be grateful for its being pointed out.
2. Look in the Process Description document or the Functional Specification document.

That does look odd; a pressure, temperature, or flow switch would seem more likely. I agree with PW--confer with the drafter if possible.

I have seen this before and it usually means eXess pressure Switch, normal designation would be PSH (pressure switch high) or PSHH (extra high).

The designation X is usually a drive and S is a switch. Position switches are designated Z as in ZSL or ZT.

XS termed as Position transmitter which are ideal for control valve position indication, mainly used in waste water treatment plant,power industries etc.

In C&I we work to ISO3511 (BS1646), this defines the use of all sysmbols and designations.

In this type of arrangement ,in my opinion the person who designed this, just wanted (intended) to take the torque switch signals of the MOV up to the shared display(High),thats it .Pressure switch may not be required here or may be possible ,process will reveal this or the client . e.g., Excess Torque Open f/b Excess Torque Close f/b

i think position of this symbol XS wrongly shown , XS is position switch which should be shown at top of Control valve for taking the feedback signal of Control valve to Know the the position of Opening of valve

i think position of this symbol XS wrongly shown , XS is position switch which should be shown at top of Control valve for taking the feedback signal of Control valve to Know the the position of Opening of valve

thanks for all replies!

i have got the answer that XS means pig indicator which use in water transmission system.

its control valve position switch in my view