XXII. 2900 Pilot Valve Options (Cont.)
7. Install Dirty Service Insert Assembly on top of
Pilot Base with inlet port facing opposite of vent
port on Pilot Base. Then install Main Piston /
Top Plate Assembly onto Base/Dirty Insert by
inserting small diameter end of Main Piston
through Insert Assemblies.
C. Dual Pilots
A dual pilot arrangement (Figure 79) is available for
applications in which the pilot valve soft goods require
monitoring and/or maintenance more often than the main
valve. In this installation, the pilot valves may be
alternated for maintenance, without bringing the system
down.
ATTENTION!
When servicing dual pilots, procedures need
to be in place to perform a tag out / lock out of
pilots under pressure if they are in service.
D. Field Test Connection
A field test connection is standard on all pilot valve types.
This allows the stroking of the valve with an auxiliary
media, e.g. air or nitrogen. An internal check valve is
present in the field test connection isolating the inlet
media from the test media and at the same time, allowing
the valve to open normally in the event of a system over
pressurization during a field test. The test port connection
is a .375” (9.53 mm) tube fitting equipped with a bug
screen.
For all applications on air, water over 140°F (60 °C), or
steam service, ASME Section VIII - Division 1 requires
each pressure relief valve to have a lifting device such
as a field test connection or a means of connecting or
applying pressure to the pilot to verify that the moving
parts essential to good operation are free to move.
(Reference UG 136(a)(3)). The lifting lever or field test
connection may be omitted under Code Case 2203. All
orders for pressure relief valves without levers or field
test connection for steam, air and water over 140°F
(60°C) must state specifically that the valves are being
purchased per Code Case 2203. The purchaser is
responsible for obtaining jurisdictional authorization for
use of Code Case 2203.
Figure 79: Dual Pilots
E. Sensing Line Filter (Standard)
Consolidated 2900 Pilot Operated Relief valves come
configured directly from the factory with specially
designed filters to ensure long term operation. These
filters should be maintained based on the service
conditions and cleanliness of the media the valve will be
exposed to. Depending on the amount of contamination
expected to be introduced to the valve, these filters
need to be regularly inspected and replaced to ensure
proper flow through the valve is maintained. Regular
maintenance intervals should be established based
on inspection of the filter at the time of service. Heavy
accumulation at the filter is an indication that more
frequent maintenance is needed. In applications that call
for exposure to a significant amount of contaminants, our
high capacity filters should be installed that allow regular
maintenance to be performed easily. Please consult
your factory authorized representatives for details on
how to obtain this configuration. The high capacity filter
configuration can be installed with independent filters that
allow the maintenance to be performed while the valve
remains in service.
Note: See Tables 27 to 30 for replacement filter
parts information.
Consolidated 2900 Series Generation II POSRV Instruction Manual
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