Installation, Operation, Maintenance
Instructions for Severn Glocon
Piston Actuators – P Series
Typical Piston Actuator –List of Parts
Top and Side
Mount Handwheel
override options
shown above
General Inspection of parts
General inspection is for visual actuator condition only and a
test to confirm smooth movement of the piston in operation.
Advanced maintenance items:
Actuator ‘O’ ring seals, wiper ring and Piston rod guides
(Soft parts are available as an actuator repair kit)
Advanced Inspection – (to be carried out by trained /
experienced personnel only)
ACTUATOR ‘O’RING SEAL’S - Not re-useable
ACTUATOR SPRING – If damaged contact Severn Glocon
for advice on repair or whether replacement is needed
PISTON ROD GUIDES - Examine general condition; renew
if necessary
USE OF THIS MANUAL, LEGAL DIRECTIVES,
ENVIRONMENTAL AND OTHER SAFETY NOTICES
This manual to be read in conjunction with Severn Glocon
“Supplementary Installation, Erection, Maintenance and
Operating Procedures” document number SGG-IOM-5000,
DS610 and any other related O & M instructions relating to
any accessories fitted to the Control Valve. All notices,
warnings and guidance given in that manual are also
applicable to this document.
INTENDED USE
Reference is to be made to the Control Valve Specification
Sheet, Installation and Operation Instructions, nameplate to
check product is suitable for the intended use / application.
See Installation, Operation and Maintenance Instructions for
Severn Glocon Control and Choke valves SGG-IOM-5000-
M01-REV02 for information on the following (Latest Ed.’s):
a) MACHINERY DIRECTIVE INCORPORATED INTO A
MACHINE
b) ATEX DIRECTIVE
c) PRESSURE EQUIPMENT DIRECTIVE PED
d) ENVIROMENTAL and OTHER LEGISLATION & IPPC
DIRECTIVE
e) RETURNING PRODUCTS
DISPOSAL
Unless otherwise stated in the Instructions, this product is
recyclable and no ecological hazard is anticipated with its
disposal providing due care is taken
If any doubts exist, contact SEVERN GLOCON LTD
quoting the valve serial number
Safety: Always ensure safe working practices are followed:
Always isolate valve before maintenance.
Always use lockout methods to ensure safety
Caution: Do not put hands inside yoke area
Always use correct tools. Do not over tighten.
Do not use extension bars to force movement
Poison risk: Do not incinerate PTFE. Do not
smoke whilst handling PTFE.
Always read the manual. If any doubts exist,
contact SEVERN GLOCON LTD quoting the
valve serial number.
WARNING: When ordered, the actuator and or control valve
configuration and materials of construction are selected to
meet particular pressure, temperature, pressure drop and
controlled fluid conditions. Personal injury, property
damage, equipment damage, or leakage due to escaping
gas or bursting of pressure containing parts may result if the
actuator and or control valve or its ancillaries are over
pressured or installed where service conditions exceed the
actuator and control valve design limits. To avoid such injury
or damage, provide a relief valve for overpressure protection
as required by accepted industry or local codes and good
engineering practice. Do not apply other conditions to the
valve without written approval from Severn Glocon.
WARNING: Before performing any maintenance operation:
Isolate the actuator and or control valve from process
pressure. Relieve process pressure from both sides of the
control valve. Drain the process media from both sides of
the valve. If the control valve is to be removed from the line
decontaminate any process fluid remaining in the valve to
make safe. Disconnect and isolate any operating lines
providing air pressure, electric power, or a control signal to
the actuator. Vent the air pressure from the actuator. Be
sure that the actuator cannot suddenly open or close the
valve (Note by disconnecting the air and or power lines the
actuator will move the valve to its power failure position).
Ensure persons are a suitable distance from moving parts.
Use lock out procedures to be certain that the above
measures stay in effect whilst work is carried out on the
actuator or control valve.
Scope of this Manual - Installation - General
This manual includes installation, operating and
maintenance information for Severn Glocon P Series
actuators only. Please refer to separate manuals for
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