3.1 Before You Begin
1.
Welker recommends that the unit have standard yearly maintenance under normal operating conditions.
In cases of severe service, dirty conditions, excessive usage, or other unique applications that may lead to excess wear
on the unit, a more frequent maintenance schedule may be appropriate.
2. Welker recommends replacing the poppets in the internal check valves weekly or semi-annually, depending on sample
outlet pressure (Table 6). Note that sample rate and product abrasiveness also impact the frequency of poppet
replacement.
Table 6: Recommended Replacement Frequency – Poppets
Replacement Frequency
Sample Outlet Pressure
Semi-annually 25–700 psig
Weekly 800–1500 psig
3. Prior to maintenance or disassembly of the unit, it is advisable to have a repair kit available for repairs of the system in
case of unexpected wear or faulty seals.
Straight threaded unions without lock washers have the potential to loosen over time due to vibration and/or other factors.
Welker recommends applying a medium strength thread-locking fluid to such unions during reassembly.
New seals supplied in spare parts kits should be lightly lubricated before being installed to ease the installation of the seals and
reduce the risk of damage when positioning them on parts. Wipe excess lubricant from the seals, as it may adversely affect
analytical instrument results.
For sample-exposed seals, Welker recommends non-hydrocarbon-based lubricants, such as Krytox®.
For non-sample-exposed seals, Welker recommends either non-hydrocarbon-based lubricants or silicone-based lubricants, such
as Molykote® 111.
After the seals are installed, the outer diameter of shafts and inner diameter of cylinders may be lubricated to allow smooth
transition of parts.
4. All maintenance and cleaning of the unit should be performed on a smooth, clean surface.
SECTION 3: MAINTENANCE
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IOM-224 MODEL: INLOOP™ ACE REV: A 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department 281.491.2331
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