Jiangsu Flowan Auto-Control Co.,ltd |
|
Small Metal Material Scotch Yoke Pneumatic Actuator Blue Color 250mm 680mm
► General — Scotch yoke pneumatic actuator
FLOWAN actuators are designed to operate without maintenance for
their normal working life. Normal working life is 500,000 cycles
(one open stroke and one close stroke).
It is recommended that regular inspections be conducted to make
certain the actuator/valve assembly operates smoothly and to check
that there are no visible or audible defects.
Replacement of internal seals and bearings allow for extended
working life. Repair kits containing all necessary seals, bearings,
grease, and instructions can be obtained through Apollo Valve
distributors.
All actuators are supplied with sufficient lubrication for their
normal working life.
For mounting the parts of the repair kit, follow the instructions
laid out in the Decommission, Dis-assembly, and Reassembly chapters
of this manual.
► Repair — Scotch yoke pneumatic actuator
Spring Return Actuator
On spring-return actuators, the spring cartridges can be
replaced. Spring cartridges should always be replaced in complete
sets.
Recommended Spare Parts
All soft seals, bearings, and non-reusable parts are included in
the recommended spare parts kits. The spare parts kit is identical
for both the double-acting and the spring-return models. For the
spring-return models, it is recommended that spare springs for each
different model be stocked in addition to the recommended spare
parts kits.
► Before Starting — Scotch yoke pneumatic actuator
The actuator must be isolated pneumatically and electrically before
any (dis)assembly starts. Before mounting or (dis)assembling the
actuator, consult the relevant sections of this manual. Actuators
can move when removing supply pressure and/or electrical control
signals from the actuator.
If not already there, a spring-return actuator will cycle to the
fail position.When removing any ball valve or plug valve assemblies
from a pipe system,isolate the piping system on which the actuator
is installed and relieve any media pressure that may be trapped in
the valve cavities before removing the actuator for maintenance. A
spring-return actuator mounted on a valve,which is stuck in
mid-stroke, contains a high spring load which will cause a sudden
rotation of the actuator versus the valve or valve bracket during
disassembly. This can cause serious injury to personnel or damage
to property.