Siemens PolyBlend PB200-2 Manual page 15

Seal Ring, Ball and Injection Check Valve
Spring Replacement
1. Carefully depressurize, drain and
disconnect the discharge and suction lines. Place
the suction tubing into a container of mineral oil.
Turn the pump on to flush the head assembly.
After flushing, lift the suction tubing out of the
mineral oil and continue to pump air into the
pump head until the pump head is purged. If the
liquid cannot be pumped due to Liquifram
rupture, with protective gloves, carefully
disconnect the tubing and four screws to remove
the head. Immerse the head in mineral oil or
other neutralizing solution.
IMPORTANT: Before disassembling valves,
note the orientation of seal ring and ball. (See
illustration).
2. Carefully disconnect one tubing
connection and fitting at a time and remove the
worn seal ring and ball. Carefully loosen sealing
by prying side to side using a small screw driver
through the center hole of the seal ring.
3. Install new seal ring and ball in each
location.
IMPORTANT: Note correct orientation.
4. Install the new spring valve in the
Injection Check Valve.
Seal Ring, Ball and Injection Check Valve
Spring Replacement
Order of Installation
Check Pump for Proper Zeroing
(Stroke Knob)
1. With pump running, turn stroke knob
counter clockwise toward zero or end of black or
red band.
2. LISTEN to the clicking as the pump is
running. The pump should operate quietly at the
zero position (no clicking).
3. If the pump continues to click at zero or
stops clicking before zero is reached, the pump
must be reset.
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