Maintenance Tips
The Humat 4-way valve is essentially maintenance free, since there are
no packing glands or sophisticated seals used in it.  Adjustment of the
butterfly can be done externally.  See "Butterfly Replacement and
Adjustment" for adjustment procedures.

Lubrications, such as a mixture of oil and graphite or equivalent, is
recommended for the threads.  The pellets bearings and races of the
female swivel do not require lubrication; however, the swivels will turn
more easily when lubricated.  If a lubricant is used, dry graphite is
recommended.  Remove the slotted set screw on the swivel and apply a
small amount of graphite through the set screw hole.  An oil based
lubricant will tend to pick-up dirt and debris which prevents smooth
turning of the swivel.

When replacing a broken female swivel, remove set screw and then
remove pellets (don't loose pellets).  Check that receiver groove has
had no damaged.  With the receiver and new female together replace
the pellets, once this is done replace with new set screw.  CAUTION do  
not over tighten the set screw.  Check assembly by rotation of flange to
assure free spinning.  Then using a hammer and screwdriver stake the
new set screw into place.

All flanged fittings can be removed by simply removing the bolts holding
the flange on the valve body.  When replacing a flange, be sure the
o-ring seal is properly seated in the groove provided.  A good
procedure is to place the o-ring in the groove, place the flange in
position and hold it there until you have one bolt on either side of the
flange finger-tight.  This should hold the o-ring in position until all bolts
are replaced and tightened securely.

The clapper disc operates automatically by differential water pressure.  
It has two seats, one between the large and small chambers and one at
the small chamber inlet.  Should leakage be observed at the small
chamber inlet while the valve is under hydrant pressure, the clapper is
not seating properly.  After shutting down the hydrant, check the surface
of the clapper disc where it comes in contact with the small-chamber
seat.  Run the tip of your index finger around the small chamber-seat to
determine if any debris has accumulated.  Any foreign matter present
on the clapper or its seat must be removed to maintain a good seal.

After checking for debris, the clapper should be checked to be sure
there is some "play" where the clapper is attached to its stainless steel
shaft.  The "play" enables the clapper to seat itself.

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1.  Remove flanged fitting from outlet of large chamber.  (Usually male

2.  Move operating handle toward closed position so the two 7/16" bolts
securing the butterfly valve in shaft are accessible.  Remove the two
7/16" bolts.

3.  Place operating handle in the open position and slide butterfly valve
disc out of the shaft and valve body.  (It may be necessary to give the
disc a sharp tap with a hammer handle or rubber mallet to get it started.)

4.  Remove shaft from valve body and clear any silicone rubber sealer
from slot in the shaft.  Slot should be completely clean and free of dust
and grease.  Use solvent if necessary, but be sure to dry surface
completely because solvents affect curing of sealer.  Now check butterfly
fit into shaft.  Look for burrs and notice area in slot to be filled with sealer
in next step.

5.  (In this step use only Dow Corning or GE Silicone Rubber Sealer.)  
Apply liberal amount of sealer at each end of slot, common screwdriver
blade to press sealer into corners of slot.  Smooth sealer carefully and
tapper it about out up the sides of shaft towards bolt holes.  Also smooth
some sealer on butterfly edges where it seats inside shaft to aid
adhesion when assembled.

6.  Replace shaft in valve body, making certain there is no sealer on
outside of shafts.

7.  Place the butterfly valve disc in valve body and shaft slot.  Do not
allow butterfly disc to pass to far thru slot.  Some may slide thru - others
will need to be pushed.

8.  Whole holding butterfly disc in position, turn operating handle toward
closed position until you can see the holes in shaft and disc enough to
align them.  Apply a small amount of sealer around the underside of the
1/4" hex head bolts.  Later models will have o-rings on bolts.  Replace
the two 1/4" bolts and tighten only finger tight.

9.  Wipe off excess sealer on the butterfly disc and inside the valve body.

10. Loosen the clamp bolt on the latching plate only enough to allow the
latching plate to turn on its boss.  Now place a strip of cardboard about
twice the match-book cover thickness between the disc and the body
wall on side that is farthest away from the engine connection so as to
bias the disc to one side of the bore.

11. Move the operating handle toward its closed position until the
latching pin engages itself in the locked-closed position.  While holding
pressure toward the closed position with one hand, with the other hand
use a hammer handle or wooden dowel to tap around the circumference
of the butterfly disc from the hydrant connection end until it has seated
itself.  While still holding pressure on the operating handle and latching
plate toward the closed position with the one hand, re-tighten the 1/4"
bolts holding the butterfly disc.  Do not over-tighten - remember these
are only 1/4" bolts.

12. Move the operating handle to the locked-open position and use a
common screwdriver blade to press a small amount of sealer in the void
at each end of the slot between disc and wall.  Use a vibrating and
packing motion to fully pack void.  Shaft can be moved a small distance
to one side, then the other to aid in packing.  Do this to aid in packing.  
Do this to both sides from the engine connection then from the hydrant
connection end.  After applying sealer at both sides from both ends,
close the valve and wipe off any excess sealer.  Then with a
dry cloth
open the valve and do the same.  Depending on the condition, curing
time will vary.  Normally the sealer will cure sufficiently in six hours to
place the valve back in service.  If will fully cure in twenty-four hours.

13. If excess leakage persists at shaft, repacking may be necessary.  To
place valve in service, adjust latching plate to lock butterfly closed as

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The butterfly type valve in the large chamber is designed to restrict
water flow sufficiently to connect a pumper's soft or hard suction.  A
small leak at each end of the butterfly shaft is acceptable to most.  With
the butterfly replacement completed as outlined above, the following
adjustments should be made:

1.  While the valve is attached to hydrant, or engine suction to aid in
holding, lube the scrub area of the o-ring on wall, being careful not to get
lube on uncured silicone.  Manually close the butterfly valve in the large
chamber and place in locked-closed position.

2.  Loosen the two 1/4" cap screws that hold the butterfly disc in place in
the shaft, just enough to allow the disc to move with fire pressure.  Place
two opened matchbook covers (with matches and strikers removed)  
between the disc and the wall at the edge that is closest to the hydrant
connection when closed and then close the valve.  Remove valve from
hydrant and using a hammer handle, tap the disc near the cardboard
from the hydrant connection end maintaining pressure on the valve
handle.  Then re-tighten the two 1/4" cap screws to lock disc in place.  
Next, remove cardboard and adjust the closing pressure by moving
latching plate.

To adjust closing pressure, mount valve on a hydrant or engine source
again to aid holding and loosen latching plate clamp.  Push latching
plate down on boss to provide clearance between it and the operating
handle and tighten clamp.  If adjusted properly, fire tension should be
needed to bring latching pin to seat.

3.  These adjustments should virtually eliminate the leak.  When
adjusted properly, the Humat Valve will have only a negligible amount of
leakage past the butterfly disc.  It will vary with pressure and use.  It may
be necessary to experiment with the closing adjustments to find the best
operation for your condition.  Note that generally, the rule "the tighter the
seal - the less leakage" applies.

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