Cla-Val 38VB/AR Series - Manual (Page 4)

DISASSEMBLY
The Vacuum Breaker Valve may be disassembled without
removal from the pipeline or may be removed from the line
for more convenience. Work on the valve should be per-
formed by a skilled mechanic. Refer to figures 1,3,4 and 2
WARNING: Drain or depressurized valve before
removing the cover completely or
pressure released may cause bodily harm.
1. Close inlet shut-off valve. Open drain valve Fig.4 or
remove drain plug Fig.2 (14) or remove cover bolts (11)
Fig.3 on the top cover (10).
2. Pry cover (10) loose and lift off valve body.
3. Remove seat retainer screws (6) and inspect seat for
cracks in rubber or wear in sealing surface.
4. Lift plug (3) from body (1) and guide bushing (5) and
inspect for wear.
5. Examine gasket (8) and replace if damaged.
6. Clean and inspect parts. Remove all foreign material from
body and cover. Replace worn parts as may be observed.
RE-ASSEMBLY
All parts must be cleaned and gasket surfaces should be
cleaned with a stiff wire brush in the direction of serration or
machine marks. Worn parts, gasket and seals should be
replaced during reassembly.
1. Place plug, 3 spring 4 and seat (2) in the body and retain
with round head seat fastener (6).
3. Place gasket over flange. The gasket must cover the seat
(2) for proper seat retention.
4. Place ring plate (10) on valve body on the flange and
install flange bolts and nuts per Table D cover and flange
bolt torques.
5. Using a cross tightening method, tighten to the torques
listed in table 3 in three increments
6. Place valve back in service. slowly open the inlet isolation
valve. Check flanges for leakage.
Bolt Size Torque (Ft-Lbs.)
1/2” 45
5/8” 93
3/4” 150
7/8” 202
1” 300
1-1/8” 450
1-1/4” 650
1-3/8” 800
TABLE D. COVER AND FLANGE BOLT TORQUES
PARTS AND SERVICE
Parts and Service are available from your local representa-
tive or the factory. Make note of the valve size, series No,
and serial No. located on the valve nameplate and contact:
Cla-Val • 1701 Placentia Ave. • Costa Mesa, CA 92627-4475
Phone: 949-722-4800
Fax:
949-548-5441
A sales representative will quote prices for parts or service.
N-AV 38VB (R-11/01)