Flowserve Heavy Duty Hydraulic Overrides - Manual (Page 2)

Operation
Operation of hydraulic overrides requires shifting a
manual valve and operating a hand pump. Standard
operation for DA or SR actuators is described below.
Operation of special hydraulic override designs is per
hydraulic schematics supplied with actuator.
Double Acting
Pneumatic Operation:
1.
Open ball valve 'B' on hydraulic override.
2. Place directional valve 'C' in mid position.
3. Open dump valves 'A' on pneumatic cylinder.
4. Connect air supply pressure and operate.
Manual Override:
1.
Close both dump valves 'A' clockwise to block air
pressure and vent cylinder.
2. Close ball valve 'B' clockwise.
3. Rotate directional valve 'C' handle full clockwise
to manual override actuator counter-clockwise.
4. Rotate directional valve 'C' handle full counter-
clockwise to manual override actuator clockwise.
5. Operate manual pump 'D' to override actuator.
Spring Return
Pneumatic Operation:
1.
Open ball valve 'B' on hydraulic override.
2. Open dump valve 'A' on pneumatic cylinder.
3. Connect air supply pressure and operate.
Manual Override:
1.
Close dump valve 'A' clockwise to block air pres-
sure and vent cylinder.
2. Close valve 'B' clockwise.
3. Operate pump to open actuator against spring.
4. Open valve 'B' to allow actuator to spring return.
Maintenance
Disassembly Procedures
1.
Disconnect all air and electric supplies from
actuator.
2. Remove all accessories from actuator and dis-
mount actuator from valve.
Note: See Heavy Duty Nuclear Qualified Actuator
Bulletin B00143 for complete instructions on actuator
disassembly.
Hydraulic Pressure Group
1.
Drain hydraulic fluid from cylinder.
2. Remove Tie Rod Nuts (8), Tie Rods (7), and the
Endcap (9).
3. Slide Cylinder (1) over Piston (2) or Ram (2). DA
Cylinder is honed and chromed; care should be
taken not to scratch inner cylinder walls.
4. DA: Remove Piston Bolt (3), and Piston Bolt
Lockwasher (4). Remove Piston (2) and Piston
Face Seal (5).
5. DA: Remove Adapter Nuts (12) and Lockwashers
(13), and carefully slide Adapter (11) over Piston
Rod. Remove High Pressure Rod Seal (14).
SR: Remove Hydraulic Adapter (11), High Pres-
sure Rod Seal (14), Rod Bearing (15), and Low
Pressure Rod Seal (16).
Reassembly Procedures
1.
Inspect all parts for wear and replace any worn
parts as needed. Normally, all seals and gas-
kets should be replaced when reassembling an
actuator.
2. Clean all components and lubricate seals with the
hydraulic fluid.
3. Reverse the disassembly procedures to
reassemble. Tie Rod Locknuts (8), Adapter Nuts
(12), and Piston Bolts (3) should be tightened to
torque listed on Bolt Torque chart. All threads
should be lubricated with Locktite Nuclear Grade
Pipe Sealant 580 prior to assembly.
4. Recommended spare parts are shown in Parts
and Materials section below.
5. Test the actuator for smooth operation and ab-
sence of hydraulic leakage before re-installing.
B00151-0 Page 2 of 4
11444 Deerfield Road
Cincinnati, Ohio 45242
(513) 489-7800
FAX (513) 489-5243
Heavy Duty Hydraulic Override
Nuclear Qualified Actuator