Flowserve Tandem Rotary Actuators - Manual

1
GENERAL INFORMATION
The following instructions are designed to assist in
unpacking, installing and performing maintenance as
required on Valtek
¨ tandem rotary actuators. Product
users and maintenance personnel should thoroughly
review this bulletin along with Installation, Operation,
Maintenance Instructions 10, Valdisk
¨ Control Valves,
prior to installing, operating or performing any mainte-
nance on the actuator. (additional features such as
handwheels, limit switches, fail-safe systems, etc).
This publication does not contain information on Valtek
positioners. Refer to the appropriate Installation, Op-
eration, Maintenance Instructions for installing, main-
taining, troubleshooting, calibrating, and operating these
accessaries.
To avoid possible injury to personnel or damage
to valve parts, WARNING and CAUTION notes
must be strictly adhered to. Modifying this prod-
uct, substituting non-factory of inferior parts, or
using maintenance procedures other than out-
lined could drastically affect performance and be
hazardous to personnel and equipment.
Spare Parts
Valtek international recommends quality, factory-built
parts be used when servicing Valtek valves. In the USA
phone 1 800 99 SPARE for spare parts information.
Unpacking
Before unpacking the actuator, check the packing list
against the materials received. Lists describing the
actuator and accessories are included in each shipping
container.
1. When lifting the actuator from the shipping container,
position lifting straps to avoid damage to tubing and
mounted accessories. With tandem rotary actuators,
do not attach a lifting ring; instead, use lifting straps
through the yoke legs.
WARNING: When lifting the actuator with lifting
straps, be aware that the center of gravity may
not be at the lifting point. Therefore, support
must be given to prevent the actuator from rotat-
Rev. 5/89/5M/B Valtek No. 49064
May 1989
ing. Failure to do so can cause serious injury to
personnel or damage to nearby equipment.
2. In the event of shipping damage, contact your ship-
per immediately.
3. Should any problem arise, contact your Valtek repre-
sentative.
Installation
Prior to installation, make sure adequate overhead and
side clearance is provided to allow for proper removal
and maintenance of the actuator.
1. Connect air supply and instrument signal. Both con-
nections are marked for the respective positioner
port. Since both cylinder and positioner are suitable
for 150 psi air supply, an air regulator is not required
unless the supply pressure exceeds 150 psi.
NOTE: In some cases, the air supply must be limited
to less than 150 psi. In this case, a sticker near the
upper cylinder air supply connection will indicate the
maximum pressure and an air regulator should be
installed to ensure the supply pressure does not
exceed this value.
2. Use the actuator to close the rotary valve tightly in
the seat before installing between the line flanges.
Do not allow actuator to open the valve until it is
properly bolted between the line flanges (see Main-
tenance Instructions 10).
CAUTION: Failure to do so may cause seat
misalignment and damage to the seat.
3. Installation of an air filter on the supply line is recom-
mended.
4. Using a soap solution, make sure all air connections
are free of leaks.
5. Be sure mounting box is sealed on all possible
locations.
PREVENTATIVE MAINTENANCE
At least once every six months, check for proper opera-
tion by following the preventative maintenance steps
outlined below. These steps can be performed while the
actuator is in service and, in some cases, without
interrupting service. If an internal problem is suspected
with the actuator, refer to the ÒDisassembly and Reas-
semblyÓ section.
Tandem Rotary Actuators