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CAUTION
Please refer to the manual attached to the product for procedures for installation and operation.
Disassembly and troubleshooting
Make sure to close the stop valves installed at before and after the product, and completely discharge the
pressure and condensate inside the product, prior to disassembly.
· Disassembly of pilot valve
1. Make sure that thermal bulb is not subjected
to temperature higher than the max. allowable
temperature.
2. Slightly loosen the lock nut, rotate the adjusting
screw counterclockwise to completely release the
spring force (no compression).
3. Detach the bolts of the spring chamber and
dismount the spring chamber and spring, etc.
4. Detach the bellows plate and take out the seal
bellows.
5. Loosen the ring and take out the bellows. Be
careful not to lose the bellows follower.
6. Detach the guide and take out the pilot valve.
7. Detach the bellows plate from the guide, and then
take out the seal bellows.
OB-2000 Main valve
Bolt
Cover
Gasket
Main valve spring
Main valve
Main valve seat
Gasket
Guide
Stud bolt
Gasket
Top diaphragm
case
Nut
Main spindle
E-ring
Retainer
Main
diaphragm
Bottom diaphragm
case
Plug
The parts shown in the rectangle boxes
Some of structures differ according to product size. Please contact us for details.
*1 Bushing is not required when using thermal well (stainless-steel made).
Completely discharge the internal pressure from the valves before disassembly.
· Disassembly of main body – main valve
1. Detach the bolts of the cover, separate the cover
2. The dedicated tool is required to dismount valve
· Disassembly of main body – diaphragm
1. Detach the pipe C at the tee and at the elbow.
2. Detach the bolts of the diaphragm cases.
OB-2000 Pilot valve
Pilot body
Pilot valve seat
Body
Pilot valve
Plug
Joint B
Spindle
Gasket
Guide
Gasket
Seal bellows
Bellows guide
Bellows plate
Bellows follower
Bellows
Ring
Flexible tube
Capillary tube
Bolt
are available as consumable parts.
www.yoshitake.jp
Temperature Regulator – Annex
from the body, and take out the main valve spring
and main valve.
seat.
Dismount the diaphragm case, main diaphragm,
retainer, and main spindle.
Name plate
Rivet
Washer of packing
OB-2000 series
Adjusting screw
Lock nut
Bolt
Washer
Spring chamber
Spring plate
Spring
Spring plate
Spring plate follower
Bellows plate
Seal bellows
Gasket
Bushing *1
Thermal bulb
-40
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