Keeping the World Flowing
13
12.0 Operation
The main components of GP/S actuators are shown in
Fig 12.1, Fig 12.2 and Fig 12.3.
5 3 6 2.1 4 1
Fig 12.1 GP/S (cast body) main components
5 3 6 2.2 4 1
Fig 12.2 GP/S (welded body) main components
Table 1: GP/S Parts list
IT DESCRIPTION QTY
1 Mechanical stop bolt 1
2.1 Centre body (cast iron) 1
2.2 Centre body (welded) 1
3 Spring cartridge 1
4 Cylinder tube 1
5 Mechanical stop 1
6 Mechanical Visual Indicator
The GP/D series actuators are pneumatic double-acting
actuators specifically designed to provide efficiency and
reliability in heavy duty services.
Actuator general features are the same of the single-acting
version, except the spring canister that is replaced by the
centre body closure group.
Main components of a GP double-acting actuator are:
•
A
scotch-yoke mechanism
, which transforms the
linear movement of the pneumatic cylinder into a rotary
movement suitable for operating quarter-turn valves, such
as ball valves, butterfly valves or plug valves. It is available
in both “symmetric” and “canted” execution to meet
application specific valve torque demand requirements.
The scotch-yoke mechanism is situated in a perfectly
sealed housing, made of welded carbon steel or in cast
iron, acting as a protection against corrosion and that
guarantees safety of personnel during the operations.
Chromium plated guide bar suitable for supporting the
transverse forces and ensure the proper alignment of the
piston rod. The Chromium plating prevents corrosion and
minimizes sliding friction.
Sliding blocks and yoke bushings are made of bronze to
reduce friction and to guarantee a long working life.
•
A
pneumatic cylinder
, made of carbon steel.
The cylinder tube is nickel plated internally by electrolysis,
to assure perfect dynamic seal, corrosion resistance and
low friction.
The piston is made of carbon steel. The dynamic floating
piston seal further reduces friction and avoids stick-slip
effect even after prolonged periods without operation.
The sliding ring made of Teflon guides the piston in the
cylinder and ensure a good radial loading capacity.
A chromium plated piston rod ensures a perfectly
dynamic seal, corrosion resistance and low friction.
The dynamic cylinder seals are specifically designed to
enable the use without lubrication.
•
Two mechanical
stop bolts
to enable the adjustment of
valve angular stroke.
•
A
mechanical visual position indicator
directly
connected to the valve stem that shows the position of
the valve all along the actuator stroke.
A4 US
US
A4
US
A4
A4 US
To Next Page
Loading...
Need help?
General
