Series 2 - T-2A cavity, Viton, cartridge seal kit

Sun offers replacement seal kits for all cartridge models. These kits include all of the external seals on the cartridge along with installation instructions. Seal kits are available in Buna-N and Viton for all models, along with EPDM and polyurethane for many models. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.

• The shelf life for this cartridge seal kit is twenty years from date of purchase. This date will be printed on the kit packaging.

What models can this kit be used with?

• CBDA 3:1 pilot ratio, restrictive counterbalance valve
• CBDAX Fixed setting, 3:1 pilot ratio, restrictive counterbalance valve
• CBDB 1.5:1 pilot ratio, semi-restrictive counterbalance valve
• CBDBX Fixed setting, 1.5:1 pilot ratio, semi-restrictive counterbalance valve
• CBDC 3:1 pilot ratio, semi-restrictive counterbalance valve
• CBDCX Fixed setting, 3:1 pilot ratio, semi-restrictive counterbalance valve
• CBDD 4.5:1 pilot ratio, semi-restrictive counterbalance valve
• CBDDX Fixed setting, 4.5:1 pilot ratio, semi-restrictive counterbalance valve
• CBDG 4.5:1 pilot ratio, restrictive counterbalance valve
• CBDGX Fixed setting, 4.5:1 pilot ratio, restrictive counterbalance valve
• CBDHX Fixed setting, 10:1 pilot ratio, restrictive counterbalance valve
• CBDL 2.3:1 pilot ratio, semi-restrictive counterbalance valve
• CBEA 3:1 pilot ratio, standard capacity counterbalance valve
• CBEAX Fixed setting, 3:1 pilot ratio, standard capacity counterbalance valve
• CBEB 1.5:1 pilot ratio, standard capacity counterbalance valve
• CBEG 4.5:1 pilot ratio, standard capacity counterbalance valve
• CBEH 10:1 pilot ratio, standard capacity counterbalance valve
• CBEL 2.3:1 pilot ratio, standard capacity counterbalance valve
• CBEY 2:1 pilot ratio, standard capacity counterbalance valve
• CKEB Pilot-to-open check valve with standard pilot
• CKED Pilot-to-open check valve with sealed pilot
• CKEV Vented pilot-to-open check valve - atmospherically referenced
• CNED Free flow side to nose check valve with bypass orifice and port 3 blocked
• CNEE Pilot-to-open check valve with bypass orifice
• CNFE Pilot-to-close check valve with bypass orifice
• COFA Pilot-to-close check valve
• COFO 120:1 ratio, pilot-to-close check valve
• CXEE Free flow side to nose check valve with port 3 blocked
• CXFC Free flow nose to side check valve with port 3 blocked
• DKFC Normally closed, balanced poppet, logic element - pilot-to-open
• DKFD Normally closed, balanced poppet, logic element - vent-to-open
• DOFC Normally open, balanced poppet, logic element - pilot-to-close
• DOFD Normally open, balanced poppet, logic element - vent-to-close
• DPCA 2-way, pilot-operated, directional valve with internal drain to port 3 - normally open
• DPCB 2-way, pilot-operated, directional valve with internal drain to port 3 - normally closed
• DPCC 3-way, pilot-operated, directional valve with internal drain to port 3 (1 blocked, 2 to 3 open)
• DPCD 3-way, pilot-operated, directional valve with internal drain to port 3 (1 to 2 open, 3 blocked)
• DVCA 2-way, vent-to-operate, directional valve with internal drain to port 3 and integral T-8A control cavity - normally open
• DVCB 2-way, vent-to-operate, directional valve with internal drain to port 3 and integral T-8A control cavity - normally closed
• DVCC 3-way, vent-to-operate, directional valve with internal drain to port 3 and integral T-8A control cavity (1 blocked, 2 to 3 open)
• DVCD 3-way, vent-to-operate, directional valve with internal drain to port 3 and integral T-8A control cavity (1 to 2 open, 3 blocked)
• FRDA Fixed-orifice, bypass/restrictive, priority, flow control valve
• LKFC Pilot-to-open, spring-biased closed, unbalanced poppet logic element
• LKFCZ Pilot-to-open, spring-biased closed, unbalanced poppet logic element with position switch
• LOECZ Pilot-to-close, spring-biased closed, unbalanced poppet logic element with metering notches and position switch
• LOFA Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 1
• LOFA8 Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 1 and integral T-8A control cavity
• LOFB Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 2
• LOFB8 Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 2 and integral T-8A control cavity
• LOFC Pilot-to-close, spring-biased closed, unbalanced poppet logic element
• LOFCZ Pilot-to-close, spring-biased closed, unbalanced poppet logic element with position switch
• LOFD Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 1 or 2
• LOFD8 Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot source from port 1 or 2 and integral T-8A control cavity
• LOFO Pilot-to-close, spring-biased open, unbalanced poppet logic element
• LOFOZ Pilot-to-close, spring-biased open, unbalanced poppet logic element with position switch
• LPFA Normally open, modulating element with pilot source from port 1
• LPFC Normally open, modulating element
• LPFCL Tuneable, normally open modulating element
• LRFA Normally closed, modulating element with pilot source from port 1
• LRFC Normally closed, modulating element
• LRFCL Tuneable, normally closed, modulating element
• PBFB Pilot-operated, pressure reducing valve
• PBFB8 Pilot-operated, pressure reducing main stage with integral T-8A control cavity
• PBFC Air-controlled, pilot-operated, pressure reducing valve
• PBFF Pilot-operated, pressure reducing valve with drilled piston orifice
• PBFF8 Pilot-operated, pressure reducing main stage with drilled piston orifice and integral T-8A control cavity
• PPFB Pilot-operated, pressure reducing/relieving valve
• PPFB8 Pilot-operated, pressure reducing/relieving main stage with integral T-8A control cavity
• PPFC Air-controlled, pilot-operated, pressure reducing/relieving valve
• PPFF Pilot-operated, pressure reducing/relieving valve with drilled piston orifice
• PPFF8 Pilot-operated, pressure reducing/relieving main stage with drilled piston orifice and integral T-8A control cavity
• PRFB Direct-acting, pressure reducing/relieving valve
• PRFR Direct-acting, pressure reducing valve
• RSFC Pilot-operated, balanced piston sequence valve
• RSFC8 Pilot-operated, balanced piston sequence main stage with integral T-8A control cavity
• RSFE Air-controlled, pilot-operated, balanced piston sequence valve
• RVEA Ventable, pilot-operated, balanced piston relief valve
• RVEB Normally closed modulating element valve with relief function
• SCEA Direct-acting sequence valve with reverse flow check
• SQFB Kick-down, pilot-operated, balanced piston sequence valve
• SXEA Direct-acting sequence valve without reverse flow check
• XBAA Port 2 to 3 open, port 1 blocked cavity plug
• XBBA Port 1 to 3 open, port 2 blocked cavity plug
• XBCA All ports blocked cavity plug
• XBOA Port 1 to 2 open, port 3 blocked cavity plug
• XBOB All ports open cavity plug

• Install back-up rings and O-rings as shown in views.
• When installing continuous back-up rings, use the same technique and the same care used to install O-rings.
• When installing cartridge - be sure to torque to recommended value.
• During 1985, SUN made a running change of all external seals on Series 2 cartridges (1-1/8 in. (28,6 mm) hex, 1-14 thd). The seals were changed from 3/32 in. (2,62 mm) c/s to 1/16 in (1,7/8 mm) c/s o-rings and backup rings.
• Use the kit which contains the same size (c/s) seals as those used on the cartridge being repaired. Do not change cartridge o-ring c/s sizes.

• Sun's Floating Style Screw-In Cartridge (1.06 MB)
• Seals: Materials of Construction
• Seal Kit Installation Guidelines