TM  5-4220-231-14&P Section V.    CHAMBER REDUCING STATION (CRS) COMPONENT REPLACEMENT PROCEDURES Page 4-25 General ........................................................... 4-74 4-26 Shutoff    Globe    Valve .................................................. 4-75 4-27 Primary     High   Pressure (HP)    Regulator ................................... 4-78 4-28 Secondary High   Pressure (HP)   Regulator .................................. 4-82 4-29 Dome    Loaded Regulator .............................................. 4-86 4-30 Check    Valve    Cartridge ................................................ 4-91 4-31 Shutoff    Valve    Cartridge ............................................... 4-93 4-32 Primary    High   Pressure (HP)   Filter ....................................... 4-99 4-33 Secondary High   Pressure (HP)   Filter .................................... 4-102 4-34 Bleed    Valve ....................................................... 4-105 4-35 Stop    Check     Valve ................................................... 4-108 4-36 Relief   Valve ....................................................... 4-111 4-37 High   Pressure (HP)   or   Low  Pressure (LP)  Gage Isolation    Valve ................. 4-113 4-25 General. This   section contains removal and    replacement procedures applicable to   the    Intermediate Direct Support Maintenance Level   of  Replace for  specific    components of  the    Chamber Reducing Station    (CRS). Due   to tubing     alignments, it  may    be    necessary to   loosen or   disconnect adjacent tubing    to   perform     these maintenance procedures. Ensure     reentry     control     procedures (Para.     3-13)   are    observed and    tubing    is tightened before    applying pressure. 4-74