12
Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
Use hoisting equipment for heavy objects (weighing approximately
20 kg or more). Failure to do so may result in back strain or other injury if
the object should fall.
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product has
cooled to room temperature. Disassembling or removing the product
when it is hot or under pressure may lead to discharge of fluids, causing
burns, other injuries or damage.
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble. (Installation, inspection, maintenance, repairs, disassembly,
and adjustment should be done only by trained maintenance personnel.)
Tightening torques
Valve Size (DN)
15-25
32-50
Seat (2) (
±
10%)
M32x1.5 170 Nm
M58x1.5 500 Nm
Body nuts (1.1) (
±
10%)
M10 10 Nm
M12 30 Nm
1. Valve body
1.1. Nuts
1.2. Gasket
2. Seat
3. Plug
4.1. Spring
4.2. Packing
4.3. Washer
5. Valve bonnet
5.1. Flange
5.2. Threaded bushing
6. Nut
7. Stem connector
8.1. Actuator stem
8.2. Rod-type yoke
Fig. 5