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Check Valve Adjustment
Models 205-627 and 205-628'have adjustable fluid in-
take and piston ball checks, which'arefactory-set for
me-
dium viscosity fluids.
l o
change the plston ball travel, loosen the
locknut
crease, and clockwise to decrease. Medium viscosity
(21.
Turn the piston body (8) counterclockwise to in-
fluids should have a 3/16 in. (5 mm) ball travel. See Fig
5. Decreasing the ball travel minimizes surging at stroke
and slows down the pump.
changeover, but too short
a
ball travel restricts the flow
l o
change
the
htake
valve
ball
travel, move the
ball
4
stop
pin
(17) to
a
higher
or
lower set of holes. Use the
middle holes for
medium
viscosity fluids.
Relax-A-Valve Repair
To remove an obstruction from the valve, loosen the
locknut ( 1
1 9 1
and turn the T-handle completely counter-
the obstruction. Stop the pump and follow the
Fig 5
clockwise. Turn on the pump and operate to flush out
Pressure Relief Procedure Warning.
Reset the
Relax-A-Valve to the automatic position. See page 5 .
15
I I
yr19
valve housing
(1
14) and seat (1181 from the pump base.
If further repair is needed, relieve pressure. Unscrew the
See Fig 6.
damage, replacing parts as neccessary.
Clean and inspect the seat and tip (117~) for wear or
Check the piston travel. Unscrew the cap (115) from the
housing. Check for
a
114 in. (6 mmJ clearance between
the stop nut 1112) and the jam nut (1031. If adjustment is
TRAVEL
necessarv, loosen the iam nut 1103) and turn the ad-
.~ ~.
~~
~
~
~
~-
juaing stem (111)
in o i o u t until you obtain the proper
I
L 2 1
clearance. See Fig
6 .
Tighten the jam nut,
Reassemble the Relax-A-Valve in the reverse order.
.
Fig 6
306-726
9
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