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7.2 Seal Replacement
NOTICE: Do not cut, tear or damage the Seals when installing them. The slightest nick or cut will cause
the valve to leak.
7.2.2 Wet Head
Install a High Pressure Seal (17) with the "O" Ring side facing in, into the smaller pocket in the top of the
Wet Head (18). Place the plastic Washer (16) over the High Pressure Seal and gently press the two
components into place. Refer to figure 12 for the proper component orientation. Install the internal Snap
Ring (15) into the groove above the plastic Washer. Lubricate inside if seals and
Insert the Metering Rod (14) into the top of the Wet Head. Gently press the
Metering Rod in until it just passes the High Pressure Seal. The opposite
end of the Metering Rod needs to extend as far as possible for the final assembly.
Lay the Wet Head on its side with the diaphragm cavity facing up, as seen in figure 13. Making sure that
the surface is clean; insert the Diaphragm (22) into the pocket. Place the "O" Ring (21), then the
Diaphragm Insert (20), followed by the internal Snap Ring (15), on top of the Diaphragm.
To install the Snap Ring, place a 10-32 x 1.0 SHCS into the insert (20), then use
a small Bar Clamp (with a soft protective material between the clamp and Wet
Head), to compress the components as figure 14 shows. When the components
are compressed and the snap ring groove is accessible, install the Snap Ring. Be
sure the Snap Ring is securely installed before removing the bar clamp. When
the clamp is removed, install the Barb Fitting (10).
Roll the "O" Ring (23) over the threads of the Luer Lock Adapter (24) as shown
in figure 15. Screw the Adapter into the bottom of the Wet Head until it is snug.
Do not use PTFE tape on the threads and do not over tighten.
NOTICE: Do not use PTFE tape on the Adapter threads and do not over tighten
the Adapter when installing.
Subassemblies (Cont'd)
15
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