End Cap And Check Valve - Flow ESL INTENSIFIER Manual

End cap and check valve

The check valves are located in a two-piece unit in the
end cap. When the check valves need service, there
will probably be one (or more) of these conditions
present:
High-pressure water temperature at the outlet
•
fitting exceeds 120°F (49°C). This indicates exces-
sive backflow through the outlet check valve.
The hydraulic piston slams to the end of travel, or
•
there is pressure pulsing in the inlet water hose.
Either condition indicates excessive backflow
through the inlet check valve.
Repetitive spiking of the high-pressure water pres-
•
sure. This indicates one or both of the valves may
be leaking excessively.
Note: If only the check valves are being serviced,
leave the intensifier in the cabinet. Be sure to keep
the work area free of airborne dust and particles.
Service steps
Place the main electrical disconnect in the OFF
position and bleed down all high-pressure lines.
Place an Out of Service tag on the main electrical
disconnect and lock it out. Failure to do so may lead
to equipment damage or injury to personnel.
1. Shut down the system.
2. Disconnect the supply water hose at the quick-
disconnect fitting and use two wrenches to discon-
nect the high-pressure water line from the check
valve outlet body. Loosen the other end of the tub-
ing and move it out of the way.
Do not bend or flex the high-pressure
tubing—it can cause early failure of the tubing.
20 | M-310
WARNING
CAUTION
3. Using two wrenches, remove the outlet body. The
outlet body contains the outlet poppet and a spring.
Note: Don't stretch or compress the spring unneces-
sarily—this can change the compression rate and af-
fect poppet performance.
4. Remove the insert from the main body. The insert
can be difficult to remove. If necessary, push the
sharpened end of a small dowel or a sharp pencil
into the insert bore, then pull it out.
Note: The lapped surface is visible when the insert is
in place.
If you are only servicing the outlet check valve, go to
Step 14. Otherwise set the outlet body, spring, pop-
pet, and insert aside.
5. Note the orientation of the main check valve body,
then loosen the end cap by tapping the spanner
wrench with a mallet. If required, remove the cable
guides, then restrain the high-pressure water cylin-
der with a strap or girth wrench.
CAUTION
Do NOT grip the cylinder with any sharp-toothed tool.
Surface scratches and gouges will lead to early part failure.
ESL Intensifier
© Flow International Corporation