Filter (High Capacity); Gag; Lifting Lever; Manual, Electrical Or Pneumatic Blowdown Valve - Baker Hughes Consolidated 4900 Series Instruction Manual

XXI. 4900 Series POSRV Options (Cont.)
C. Filter (High Capacity)
Filter options are available for dirty applications.
These filters are installed in the pilot inlet sensing
line. For the 49PV and 49MV, an optional high
capacity filter options (Figures 37) include:
1. A carbon steel cadmium coated filter body with a
35 micron stainless steel element and 2.
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.
High Capacity
Canister Filter
Internal View -
High Capacity
Canister Filter
Figure 37: High Capacity Canister Filter
72 |
Baker Hughes
D. Gag
(Figure 38)
A manual method of locking a pilot operated relief
valve in the closed position for system hydrostatic
test. 49MV72 limited to 4800 psig (330.95 barg) with
gag option.
Figure 38: Gag
E. Lifting Lever
(Figure 18 in Section XVI)
This is an external, physical means of allowing the
pilot valve to relieve dome pressure so that the main
valve can open.
F. Manual, Electrical or Pneumatic
Blowdown Valve
An optional manual blowdown valve is available
for relieving the pilot operated safety relief valve.
Consult factory for applications requiring a
pneumatic or electrical solenoid blowdown valve
which may be connected to a distant location, such
as an operator station, for remote actuation. The
blowdown valve is ported directly to the main dome
area, so that the media in the dome is vented when
the blowdown valve is actuated, thus allowing the
main valve to open.
Figure 39: Manual Blowdown Valve
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(Figures 39, 40)