Buying Guide

NIBCO INC. WORLD HEADQUARTERS • 1516 MIDDLEBURY ST. • ELKHART, IN 46516-4740 • USA • PH: 1.800.234.0227
TECH SERVICES PH: 1.888.446.4226 • FAX: [phone] • INTERNATIONAL OFFICE PH: +1.574.295.3327 • FAX: [phone]
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Installation Instructions for Metal Connections (cont.)
1. Cut tube end square to exact length needed, so that tube will enter
valve socket all the way to the shoulder. Ream, burr and file.
2. Clean tube to a distance slightly more than what will fit into the
socket, and clean valve socket. Wire brushes may be used, but
avoid removing an excessive amount of metal. Fine sand cloth or
emery cloth may be used with the same precautions. Steel wool is
not recommended.
3. Apply flux to tube and socket sparingly and with a fairly thin con-
sistency. Avoid flux on areas not cleaned, particularly inside of
tube.
4. Assemble parts to be brazed. If fluxed parts are allowed to stand,
the water in the flux will evaporate. Dried flux is liable to flake
off, exposing metal surfaces to oxidation. Assembly joint by insert-
ing tube into socket hard against the stop. The assembly should
be firmly supported so that it will remain in alignment during the
brazing operation. Removal of bonnet is recommended when
installing globe valves with soft seats.
5. Apply heat to parts to be joined. The preferred method is by oxy-
acetylene flame. Heat tube first, beginning one inch from edge
of valve. Sweep flame around tube in short strokes up and down
at right angles to run of tube. To avoid burning through tube, the
flame should be in continuous motion and not allowed to remain
on any one point.
Apply flame to valve at base of socket. Heat uniformly, sweeping
flame from fitting to tube until flux on fitting becomes quite. Avoid
excessive heating of valve.
When flux appears liquid and transparent on both tube and valve,
start sweeping flame back and forth along axis of joint to maintain
heat on parts to be joined, especially toward the base of the valve
socket.
6. Apply brazing wire or rod at point where tube enters valve socket.
Keep flame away from rod or wire at it is fed into the joint. Move
flame back and forth as alloy is drawn into joint. When the proper
temperature is reached, alloy will flow readily into space between
tube outer wall and valve socket. When joint is filled, a continuous
rim of brazing alloy will be visible.
THREADING
Grit, dirt or any foreign matter accumulated in the pipe can hinder
efficient valve operation and seriously damage vital valve parts.
Thoroughly clean pipe internally with air or steam.
When threading pipe, gauge pipe threads for size and length to avoid
jamming pipe against seat and disc. Thoroughly clean threaded end to
remove any harmful steel or iron deposits. Apply pipe dope sparingly
on pipe threads, never on valve threads. Do not allow any pipe dope
into valve body in order to avoid damage to disc and seat.
Before installation, check line of flow through valve so that valve will
function properly. Close valve completely before installation. Apply
wrench to hex next to pipe and guard against possible distortion.
After installation of valve, support the pipe line; a sagging pipe line
can distort the valve and cause failure.
COMPRESSION
For compression end connection, first slide compression nut onto
copper tube, then slide on ferrule. Install the valve onto the copper
tube and gently slide compression nut and ferrule up to the valve to
engage. Do not use pipe dope. Tighten nut until resistance is felt.
Tighten additional ¹⁄₂ turn. DO NOT OVER TIGHTEN!