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MAINTENANCE
The BV70 Series utilizes our self compensating stem seal design. This design automatically compen-
sates for wear as well as thermal expansion and contraction resulting in a leak tight, maintenance free,
service life.
Once the stem seal has worn beyond the compensation afforded by the Belleville springs adjustment
of the stem nut may enable valve to be returned to service. Holding the ‘flats’ of the stem, tighten the
stem nut until Belleville springs become fully compressed (flattened); the torque required to tighten the
nut further increases sharply when this point is reached. Do not tighten the stem nut beyond this point
to avoid damage of the stem seal.
DIMENSIONS
4
INSTALLATION INSTRUCTIONS
Tube (initial assembly):
1. Ensure the tube end is square and free from burrs, nicks, scratches and debris.
2. Loosen the NUT by turning it counter-clockwise one turn. Insert the tube though the NUT and
FERRULES until it sits against the internal VALVE SHOULDER. Tighten the NUT (clock-wise) hand
tight. Continue tightening the NUT with a wrench for 1 to 1-1/4 turns or until snug.
Note: for re-assembly, after initial assembly, approximately 1/4 turn with wrench is generally required
to re-tighten.
Tube
Size OD
Dimensions - Inches
ABCDE F
1/4 3.72 1.58 .50 2.31 .19 9/16
3/8 3.70 1.58 .50 2.31 .28 11/16
1/2 3.94 1.58 .50 2.31 .36 7/8
3/4 4.17 1.67 .59 3.41 .49 1-1/8
1 4.92 1.91 .75 3.41 .62 1-1/2