3.1 Before You Begin
1.
Maintenance is necessary if a leak occurs at one or both valves.
2.
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.
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.
3.
All maintenance and cleaning of the unit should be performed on a smooth, clean surface.
4.
Welker recommends having adjustable wrenches available for maintenance. Please note that the exact tool required
may vary by model.
SECTION 3: MAINTENANCE
13
IOM-101
MODELS: PP-1, PP-2, PP-3, and PP-F
REV: C
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
