6-15
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56 Hudson St., Northborough, MA 01532 Ph: (508) 393-0155 Fax: (508) 393-5476
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6.3 Maintaining the Priming Valves
Replace the priming valve seal if you suspect a leak.
To replace the priming valve seal:
1.
Obtain a seal replacement kit from your authorized service agent. The kit contains two sets
of seals and a hex tool.
2.
Turn off the pump (use the Prime Pumps option) and remove the eluant tubing from the
reservoir.
3.
Remove the valve stem assembly from the valve by unscrewing the hex nut (Figure 6-12)
to prevent any siphon flow. Catch any eluant drainage in a suitable container.
Figure 6-12 Priming Valve Assembly
Note: Be careful not to scratch or otherwise damage the internal parts of the valve while removing
the seal retainer.
4.
Use the hex tool to turn the hex socket seal retainer and remove it.
5.
Using a wire with a small right angle bend formed in the end, carefully remove the Teflon
seal ring from the valve body. Do not scratch the sealing surface around the seal.
6.
Pull the plastic tip from the stem using tweezers or small pliers.
7.
By hand, insert a new plastic tip into the stem assembly, blunt end first. Seat the tip firmly
with light pressure against a clean hard surface.
8.
Insert a new Teflon seal ring into the valve body fully until it rests flat against the body
beyond the threads.
9.
Replace the seal retainer and tighten firmly with the hex tool.
10.
Replace the stem assembly into the priming valve body and turn one or two turns past the
point where you feel initial resistance.
11.
Reconnect the eluant tubing.
12.
Use the Prime Pumps option to run the pump for a few minutes to purge the valve.
13.
Close the valve firmly to seat the tip seal.
14.
Run the pump and check for leaks around the priming valve.
Teflon seal ring
Plastic tip
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