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XXII. 2900-40 Series POSRV Options (Cont.)
F. Gag
A manual method of locking a pilot operated relief valve in
the closed position for system hydrostatic test. (Figure 48).
G. Heat Exchanger
This allows the temperature range for the 2900-40 POSRV with
metal seats to be extended to -450°F to 1200°F (-267.8°C to
648.9°C). Not available above 3750 psig (258.5 barg). When the
heat exchanger is selected, the POSRV shall be piped so that the
media enters the heat exchanger first to condition the media’s
temperature. Option(s) such as line filter, canister filter, 5-way
Figure 48: Gag
Figure 50: Heat Exchanger - Cold Service
Figure 49: Heat Exchanger - Hot Service