XXII. 2900 Pilot Valve Options (Contd.)
E. Filter (Single, Dual, or High Capacity)
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 68). 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 69) 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 70) 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 70: Dual Filter
Figure 68: Sensing Line Filter
Figure 69: High Capacity
Filter
78 | BHGE
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