Technical data

ManualsBrandsSharp ManualsMicrowave OvenR-408H

MAINTENANCE OF SHAFT SEALS

MECHANICAL SEALS

When mechanical seals are furnished, a

manufacturers reference drawing is supplied with the

data package. This drawing should be kept for future

use when performing maintenance and adjusting the

seal. The seal drawing will also specify required flush

liquid and attachment points. The seal and all flush

piping must be checked and installed as needed prior

to starting the pump.

The life of a mechanical seal depends on various

factors such as cleanliness of the liquid handled and

its lubricating properties. Due to the diversity of

operating conditions it is, however, not possible to

give definite indications as to its life.

Starting from the innermost ring, the packing is

usually arranged as two packing rings, lantern ring,

three packing rings, followed by the split gland

(Fig. 14). Insert single packing rings by twisting as

shown in Fig. 6. Press each ring to ensure proper

compression in the stuffing box. Stagger joints 90”.

Refer to Fig. 13A, 136.

tightly and evenly tighten the gland. Excessive

tightening will result in premature failure of the

packing and shaft sleeve. After packing it must be

possible to rotate shaft by hand. Final adjustment of

packing gland is made after pump is started.

Never operate the pump without liquid supplied

to mechanical seal. Running a mechanical seal

dry, even for a few seconds, can cause seal

damage and must be avoided.

Physical injuv

can occur if mechanical seal fails.

PACKED STUFFING BOX

Lock out driver power to prevent accideniai

start-up and physical injuty.

The stuffing box is not packed at the factory and must

be packed properly before operation of the pump. The

packing is furnished in a box of fittings which

accompany the pump. The packing used must be

suitable for the pumpage. Make sure the stuffing box

is clean. Examine shaft-sleeve for wear or scoring,

replace if necessary.

DYNAMIC SEAL

Dynamic Seal Components

Repeller - The dynamic repeller effectively prevents

leakage of pumpage through the stuffing box when

the pump is operating under published acceptable

conditions. Dynamic seal parts do not wear

substantially to affect operation unless the service is

particularly abrasive or corrosive. Refer to Section 6

for maintenance disassembly and repair.

A static seal is used to prevent leakage when the

pump is shut down: This is’either a lip seal,

elastomeric face seal, or graphite packing. The lip

and elastomeric face seal require no maintenance

other than replacement when leakage becomes

excessive. The packing should be installed as for

stuffing box packing, and is a special type designed to

run dry, so does not require an external

f&h.