Water Pump User Manual

Doc No: OMM50000903
Rev: B Page 43 of 65
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property of FMC Technologies, and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by FMC.
10.3.2 Replacing “L” Series Disc Type Valves
10.3.2.1 Introduction
The disc type valve used in “L” series FMC pump models is shown in Figure 13. The
standard construction of stainless steel seat, disc, and stop are a cost effective design
with excellent performance and ample life. These valve assemblies come pre-
assembled from the factory and should not need to be disassembled.
Figure 13: Typical L Series Disc Valve Assembly
When a worn or malfunctioning valve is detected, it must be replaced. With disc valves
the most difficult task associated with replacing a valve is the removal of the seat from
the fluid cylinder. The seats are held into the fluid cylinder with a matching locking
taper. Removal is particularly difficult if the discharge pressure of the pump was over
3,000 psi or corrosive fluid was pumped.