Marwin Valve 3L/T 2100F-A Series 3-Way Ball Valve - Manual (Page 3)

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When mounting an actuator in the field, it is good prac-
tice to manually operate the valve several times with a
wrench to break the torque that may have built up dur-
ing long term storage.
Maintenance
Before starting maintenance, please read the informa-
tion contained in the Caution Section of this manual.
The maintenance frequency is determined based upon
the application of the valve. User should consider the fol-
lowing factors when determining the maintenance time
interval: fluid type, flow velocity, operation frequency,
pressure and temperature.
1. Operate the ball valve at least once to completely
release the pressure from valve body.
2. Ball valves, if correctly used, normally do not need
any internal lubrication and maintenance. However,
when necessary, ball or seats can be replaced by
qualified personnel following the instructions of this
manual.
3. Recommended spare parts are indicated in the parts
table for Figures 1 and 2.
Valve Disassembly
Always depressurize the pipeline with the valve in the
open position and cycle valve to remove media that
might be trapped inside valve cavity before disassem-
bling valve or removing it from pipeline.
To facilitate reassembly of the valve so that the operation
is not changed, it is recommended that the orientation
of the following be marked: stop plate (27, 28), stem (us-
ing port markings on top of stem as reference), and ball
ports. In addition, each cap and cover should be match
marked to the body so that everything is reassembled in
the same location and orientation.
1/2” - 2” (Figure 1)
1. Remove handle nut (30), handle (29), saddle lock
washer (24), stem nut (21), and Belleville washers
(20).
2. Unbolt and remove three end caps (2) and one
blank cap (3).
3. Lift ball (5) out of body (1), being careful not to dam-
age ball.
4. Push stem (6) through body (1). Be careful to remove
or secure anti-static ball and spring (7) so that they
are not lost from stem.
5. Remove thrust washer (16) from stem shoulder or
recess in body. Remove stem O-ring (17) from stem.
6. Remove packing gland (19), and packing (18), from
packing chamber in body.
7. Remove body seals (10).
8. Remove seats (8) from caps (2) and (3).
2-1/2 - 6” (Figure 2)
1. Remove handle bolt (30), handle (29), handle
adapter (28), stop pin nut (33), and stop pin (32).
2. (2-1/2” - 4”) Remove threaded packing gland ring
(22), using spanner wrench. Remove Belleville
washers (20).
3. (6”) Remove stop plate retainer ring (27a), and stop
plate (27). Remove gland bolts (26), and gland (23).
4. Unbolt and remove three end caps (2), and one
blank cap (3).
5. Lift bonnet (4) over stem (5) and out of body (1).
6. Lift ball-stem (5) out top of body (1), being careful
not to damage ball.
7. Remove stem O-ring (17) from stem shoulder or
recess inside bonnet.
8. Remove gland (19) and packing (18) from packing
chamber in bonnet.
9. Remove four cap seals (10) and one bonnet seal (11)
from body.
10. Remove seats (8) from caps (2) and (3).
11. Remove ball support (trunnion) bearing (9) from
body (1).
Inspection and Replacement
Clean and inspect all components to be sure that they
are free from foreign matter and pit marks, paying par-
ticular attention to the areas that must maintain a seal.
1. Ball: The surface of the ball should be free from any
defect. If any are found, the ball should be replaced.
Using a defective ball will be extremely detrimental
to valve performance.
2. Seats: Replacement of seats is recommended.
3. Stem seals and body seals: stem and body seals
should be discarded and replaced.
4. Remaining components of the valves: after
cleaning, carefully examine for wear, corrosion,
and mechanical damage. Pay particular attention to
finished diameter on stem, stem seal areas on top
cover, and gasket sealing surfaces on body, caps
and cover. Replace all defective parts.
Valve Disassembly
Before reassembly, inspect the valve for any damage
on body adaptor and all internals. Marwin recommends
changing the seals and seats after disassembly.
Reassemble parts in original orientation.
Apply a suitable anti-seize coating to bolting to prevent
galling.