Smartline Autosampler 3900 Manual / Handbuch V 1508 03/2007

Maintenance 51
stator. The slots are the connecting passages in the rotor seal. Rotation
of the valve 60°switches the valve from one position to another.
Fig. 42: Flow diagram of model 9740 as viewed from stator
Specifications
• Maximum temperature is 50°C.
• The valve is set to hold 345 bar (5000 psi).
• The wetted surfaces are PEEK alumina ceramic, and an inert
polymer.
Important Safety Notices Caution:
Use only plastic ferrules in the stator ports. Metal ferrules can cause
irreparable damage to the plastic stator.
Maintenance
With normal use the valve will give many tens of thousands of cycles
without trouble. The main cause of early failure, which is seen as a leak
in the valve, is abrasive particles in the sample and/or mobile phase,
which can scratch the rotor seal.
Following is the procedure for changing the rotor seal, stator face
assembly, and isolation seal. Refer to Fig. 43 and proceed:
• Remove the three stator screws with a 9/64 inch hex key.
• Remove the stator, stator face assembly and stator ring from the
valve body.
• Pull the rotor seal off the pins.
• Remove the isolation seal.
• Mount the new isolation seal with the spring side facing away from
the rotor seal.
• Mount the new rotor seal. The three pins on the shaft assembly fit
into the mating holes in the rotor seal only one way. Mount the seal
with the grooves facing the stator.
• Replace the stator ring so that the body locating pin in the stator
ring enters the mating hole in the body.
• Put the new stator face assembly on the stator. The three pins on
the assembly fit the mating holes in the stator only one way.
• Mount the stator and stator face assembly on the valve so the
stator locating pin in the stator ring enters the mating hole in the
stator.
• Replace the three stator screws. Tighten each an equal amount
until the screws are tight.