XXII. 2900 Pilot Valve Options (Cont.)
F. Single, Dual and High Capacity
Filters (Optional)
Filter options are available for dirty applications. These
filters are installed in the pilot inlet sensing line. For
the 39PV and 39MV, an optional sensing line filter is
available (Figure 80). This filter has a 316 stainless steel
body, Teflon
®
seals, and a 40-50 micron stainless steel
filter element. Other high capacity filter options (Figure
81) include:
1.
A carbon steel filter body with a 35 micron stainless
steel element; and
2. An entirely stainless steel filter arrangement.
These filters may be equipped with a manually
operated needle valve which allows for purging the
filtered material while the valve is in operation. All
filter elements are stainless steel, and all filters,
including carbon steel, conform to NACE Standard
MR0103 and MR0175. A dual filter arrangement
(Figure 82) is available for applications in which
the customer is unsure of the filter maintenance
requirements. In these cases, a preventive
maintenance program may be developed by
monitoring the filters, without taking the valve off
line.
ATTENTION!
When servicing dual filters, procedures need to
be in place to perform a tag out / lock out of pilots
under pressure if they are in service.
Figure 82: Dual Filter
Figure 80: Sensing Line
Filter
Figure 81: High Capacity
Filter
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