Flowserve Valtek Spring Cylinder Rotary Actuators - Manual

This bulletin contains instructions on maintaining the
clamping and non-clamping splined lever design.
Contact the factory or your Flowserve representative for
more information on the diaphragm seal assembly design.
To avoid possible injury to personnel or
damage to valve parts, WARNING and CAUTION
notes must be strictly followed. Modifying this
product, substituting non-factory parts, or
using maintenance procedures other than
outlined could void warranties, drastically
affect performance and be hazardous to
personnel and equipment.
Unpacking
1. While unpacking the actuator, check the packing
list against the materials received.
2. When lifting the actuator from the shipping container,
position lifting straps and hoist to avoid damage to
tubing and mounted accessories.
WARNING: When lifting an actuator with lifting
straps, be aware the center of gravity may be
above the lifting point. Therefore, support must
be given to prevent the actuator from rotating.
Failure to do so can cause serious injury to
personnel and damage to actuator or nearby
equipment.
3. Contact your shipper immediately for any shipping
damage.
4. Contact your Flowserve representative for any
problems.
GENERAL INFORMATION
The following instructions are designed to assist in
unpacking, installing and performing maintenance as
required on Valtek
® Spring Cylinder Rotary Actuators.
Product users and maintenance personnel should
thoroughly review this bulletin prior to installing, oper-
ating or performing any maintenance on the actuator.
Separate maintenance instructions cover additional
components (such as Valdisk and ShearStream body
assemblies, fail-safe systems, limit switches, hand-levers,
position transmitters and handwheels.
This publication does not contain information on
Flowserve positioners. Refer to the appropriate main-
tenance bulletin for installing, calibrating, maintaining,
troubleshooting and operating Flowserve positioners.
IMPORTANT
Three designs of the Spring Cylinder Rotary Actuator
exist in service today. The original design contained a
diaphragm seal assembly in the actuator. This assembly
was later replaced with a sliding seal assembly. Life-
cycle testing under rigorous conditions shows sliding
seals will last many times longer than diaphragm stem
seals. Made of Delrin 100 and bronze, sliding seals are
durable and much easier to maintain. Since the sliding
seal design has replaced the diaphragm as Flowserve’s
standard, it is highly recommended that the diaphragm
stem seal be replaced with the sliding seal.
The third design uses a standard rotary actuator with
a sliding seal assembly in the actuator and a clamping
lever arm in the transfer case.
Maintenance personnel should become familiar with
the particular rotary actuator design needing service
and follow the appropriate maintenance instructions for
that design.
Valtek Spring Cylinder
Rotary Actuators
VLEEIM031-13 © 2012 Flowserve Corporation. Flowserve Corporation, Valtek Control Products.
Installation, Operation, Maintenance Instructions
Flow Control Division