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Liquid end without bleed valve
version TT, SS
Installation instructions/
commissioning
HV version (PP4)
Liquid end PP, NP
with bleed valve
Coarse bleeding
Version 2.0
Commissioning
• Connect discharge line to liquid end, however not to injection
valve.
• Operate metering pump with stroke length/stroking rate 100% and
pressure-free discharge line by simultaneously pressing the
and
-keys until the medium has completely filled the liquid
end without any bubbles.
This can be verified by the medium being visible in the discharge line or
when it comes out of the discharge line.
• Now fasten the discharge line to the injection valve.
• For long suction and discharge lines with low flow resistance, use
fittings and mounting parts, e.g. arcs instead of angles, install pulsation
dampener near the metering pump; increase diameter by one nominal
width.
• Initial priming and bleeding is made difficult by the valves and valve
springs still being dry. Therefore select as short a priming lift as
possible or bleed the liquid end with influx or response pressure on the
suction side. If this is not successful, we recommend the following
procedure: unscrew the discharge connection, press away the ball
from the O-ring seat and fill the liquid end with water or suitable fluid.
After this assemble the discharge connection without the valve spring,
push a short length of PVC hose (approx. 100 mm) onto the hose
nozzle and fill with water halfway. Let the pipe operate at max. stroke
length until the metering is visible in the hose. Then re-insert the valve
spring. In order to prevent tilting, insert a mandrel with an approx.
diameter of 4 mm through the head valve and thus keep the spring in
the central position. Reconnect the discharge line, the pump is ready
to operate.
• If the capacity is reduced, we recommend working with a longer stroke
length and decreased stroking rate.
• If possible proceed as for version TT, SS.
If this is not possible,
• connect the discharge line to the liquid end and the injection valve.
17a
17b
• Open bleed valve (17) by turning it anti-clockwise.
• Now the passage is open for coarse suction bleeding via the bypass.
17
G/4b-011-D
Page 39 of 88 pages
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