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Upper
& Lower Kelly Valves
Parts Assembly
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To reassemble, place the body with
the "upper end" down. The seat with new rings should be
placed snugly inside the housing (with the Teflon seal ring facing
up).
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The operating stem (with new
ring) should be put into place in the closed position. The ball
will then slide easily into the stem cog.
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With the seat housing
"up" on the double-pin sub, install the corrugated spring
and the lower seat.
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Lubricate the threads and shoulders
(to prevent thread damage), rejoin the two body pieces, and tighten
with chain tongs. Install a grease zert in the body. Use a heavy-duty,
water-repellent grease and grease the valve thoroughly. Remove the grease zert and install
the plug.
The valve is now ready to be pressure-tested and placed back in
service or stored for future use. When the valve is returned to the
drill string, remember to make-up the two body pieces using the
pipe tongs and the proper amount of torque for similar size drill
collar connections.
Routine Maintenance
Lubrication
WNCO VALVE'S kelly valves are designed with a grease fitting
located opposite the stem. At least three times a week, remove the plug,
install the zert and lubricate with a heavy-duty, water-repellent grease.
Replace the plug before resuming operation.
TIP: Always grease the valve thoroughly and operate the stem
several times after removing the valve from the drill string, even if
only storing the valve for a short period of time. This will help prevent
drilling mud from setting up inside the valve and "freezing" the
ball and stem.
OPERATION
Open and close the valve two or three times a week to help keep
the parts free of debris. NEVER operate the valve in a partially open or
closed position; always open or close the valve fully.
Testing
Check the connections and pressure test regularly just as you
would with all BOP equipment. Pressure test from the pin end as
recommended by API Spec 7.
WNCO VALVE'S kelly valves are precision
manufactured to provide maximum life with a minimum of maintenance. By
following these routine procedures, longer and more trouble-free operation
is assured.
SUMMARY
Routine Maintenance
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Do not tong on the stem area.
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Grease the valve regularly, at
least three times a week.
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Use only water-repellent grease.
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Open and close the valve often to
prevent accumulations of debris.
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Check connections and pressure test
regularly.
Field Repair
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Break the valve at the mid-body
connection when removing from the drill string for repairs.
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Remove all rings and seals and
replace with new, even if they do not appear to be worn.
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Metal parts may be reused if wear
has not occurred.
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Install parts with seals carefully
to avoid seal damage (use a light coating of grease).
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Handle threads with care.
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Grease the valve thoroughly before
placing in operation.
Quality WNCO VALVE Parts and
Replacement Kits
A complete inventory of replacement
parts for every model WN-2 valve is in stock at all times so there's never
a delay, never a wait. You can be sure of proper fit and easy replacement
in the field since all the parts are precision milled or fabricated to
original equipment specifications. It is recommended that a complete parts
kit be on location at all times to minimize costly downtime.
Dependable Service and Repair
There are times when the condition of a
valve warrants sending it to the shop. When that happens you can depend on
WNCO VALVE to provide expert repair service, regardless of the brand. From
minor repairs to major overhauls, each job receives the same attention to
detail found in every WNCO VALVE Product.
INSPECTION
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Carefully inspect all metal parts
for wear, nicks, scraper of deep abrasions, and replace if necessary.
Remove all the o-rings and seals from the seats and stem, and install
new WN-2 replacements.
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Carefully check the stem hole in
the body for damage. Buff out the hole to remove any corrosion, being
careful not to remove too much metal. It is important that this
surface is clean and smooth before reassembly.
NOTE: If fluid has caused any washed areas in the stem hole, if any
cracks are found in the stem hole, or if the stem hole has become too
oversized, the valve should not be reassembled. Instead, return the
valve body to WNCO VALVE for repair. Often the body can be repaired by
machining the stem hole to oversize specifications and install an
appropriate oversize operating stem
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Clean and inspect both pins on the
sub, and both boxes and the operating stem hole in the body as per
standard blacklight, magnetic particle inspection. Either of the
external joints (box or pin) may be reworked if there is enough space
left for tong purposes after the joint is remachined. Under no
circumstances should the internal box of the body be reworked; if this
box is bad, the body must be replaced. On the sub, the modified pin
which holds the internal seat may be reworked, but it will be
necessary to remachine the seat housing as well. In this case, the sub
should be returned to WNCO VALVE for precision machining of the pin
and seat housing. WNCO VALVE cannot warranty machine work performed by
others.
***WARNING If the stem hole is found cracked, even if no
evidence of pressure leakage is detected, the valve body must be
replaced. A crack in the stem area can severely weaken the strength of
the valve body.
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