12
Installation, Commissioning and Maintenance Manual
12.0 Operation
The following instructions must be followed and integrated
into end user safety program when installing and using
Rotork products. Read and save all instructions prior to
installing, operating and servicing this product.
Follow all warnings, cautions and instructions marked on and
supplied with the product.
Install equipment as specified in Rotork installation
instructions and as per applicable local and national
codes of practice. Connect all products to the proper
pipeline gas sources.
When replacement parts are required, ensure that the
qualified service technician uses only replacement parts
specified by Rotork.
Substitutions will invalidate any hazardous area certification
and may result in fire, electrical shock, other hazards or
improper operation.
12.1 Description
The LP/S series actuators are pneumatic single-acting –
spring-return actuators specifically designed to provide
efficiency and reliability in heavy duty services.
These actuators can be assembled in a ‘spring down’ (LP/SD)
or in a ‘spring up’ (LP/SU).
Model LP/SD is air to retract actuator stem, while spring
extend it.
Model LP/SU is air to extend actuator stem, while spring
retract it.
Main components of a LP/S actuator are:
• A
pneumatic cylinder
, made of carbon steel.
The cylinder tube is electroless nickel plated internally, to
assure perfect dynamic seal, corrosion resistance and low
friction. Carbon steel piston with dynamic O-ring seal and
guide sliding ring allow for friction reduction which avoid
sticking even after long standstill periods.
Chromium plated and polished piston rod ensures a
corrosion resistance and low friction. The piston rod is
supported by bushing made of bronze and Teflon to
reduce friction and to guarantee a long operating life.
The dynamic cylinder seals are specifically designed to
enable the use without lubrication.
• A
spring cartridge
consisting of an enclosure containing
a frame assembled spring package that prohibits the
spring from extending beyond a pre-set length. The
container allows safe installation and removal of the
whole cartridge assembly.
• An
adapter spool open type
made in carbon steel, with
bottom flange machined per the valve flange and it is
removable from the actuator. The open adapter allows for
easy visual position indication and is suitable for installing
a limit switch box, junction box etc.
• A
connecting joint
made of nickel plated carbon steel for
mating the actuator piston rod to the valve stem.
An optional coupling with hammer blow effect that
facilitates release of wedge gate valves is available upon
request.
Upon request, LP series actuators can be equipped with
additional accessories (limit switches box, positioner, position
transmitter, control panel, etc.)
Use only control devices supplied by Rotork.
Installation of any accessory on the bare actuator
must preserve the actuator Ingress Protection level.
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Summary of Contents for LP/S Series
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