Val-Matic 100S to 103S 1/2-3 Air/Vacuum Valve - Manual (Page 4)

3
SIZE TORQUE (FT-LBS)
5/16" 10
3/8" 24
1/2" 59
5/8" 117
MAINTENANCE (Cont'd)
1. Close the inlet shut-off valve.
2. Open the drain valve to allow the fluid in the
valve to drain. It may be necessary to apply
a downward force on the float to unseat the
valve.
3. Close the drain valve.
4. Slowly open the inlet shut-off valve to fill the
valve with water. Observe the seating action
and verify that the valve closes without
leakage.
5.
If leakage occurs, the valve should be
removed and inspected for wear or possible
damage from foreign matter.
TROUBLESHOOTING
Several problems and solutions are presented
below to assist you in troubleshooting the valve
assembly in an efficient manner.
•Leakage at Bottom Connection: Tighten valve
threaded connection. If leak persists, remove
valve and seal threads with Teflon sealant.
•Leakage at Cover: Tighten bolts, replace
gasket.
•Valve Leaks when Closed: Inspect seat for
damage and replace.
DISASSEMBLY
The valve can be disassembled without
removing it from the pipeline. Or for
convenience, the valve can be removed from the
line. All work on the valve should be performed
by a skilled mechanic with proper tools.
1. Close inlet shut-off valve. Open drain valve
or remove drain plug. Remove the cover
bolts (7) on the top cover.
2. Pry cover (2) loose and lift off valve body.
3. Remove retainer bolts (8) and inspect seat
for cracks in rubber or wear in sealing
surface.
4. Turn guide bushing (9) to remove it from the
cast baffle (3).
5. Clean and inspect parts. Replace worn parts
as necessary.
RE-ASSEMBLY
All parts must be cleaned and gasket surfaces
should be cleaned with a stiff wire brush in the
direction of the serrations or machine marks.
Worn parts, gaskets and seals should be
replaced during reassembly.
1. Apply Loctite to guide bushing threads (9)
and thread bushing into baffle (3). Insert float
shaft into float (5).
2. Lay seat (4) over inverted cover with flat
surface directed toward cover.
3. Install float assembly and baffle over seat
and secure with retaining bolts (8) at 10 ft-
lbs.
4. Lay cover gasket (6) and cover (2) over bolt
holes in body (1).
5. Insert lubricated bolts (7) and tighten to the
torques listed in Table 2.
TABLE 2. VALVE COVER BOLT TORQUES
WARNING: The line must be drained
before removing the cover
or pressure may be
released causing bodily
harm.