Series 1 - T-21A cavity, buna-N, cartridge seal kit

990021007 : Series 1 - T-21A cavity, buna-N, cartridge seal kit
Technical Features [ + ]

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 ten years from date of purchase. This date will be printed on the kit packaging.
Cartridge Installation Data [ + ]
Series 1
Cartridge Thread M20M20
Valve Hex Size 7/8 in.22,2 mm
Valve Installation Torque 30 - 35 lbf ft41 - 47 Nm
Cavity T-21A
Cartridge Seal Installation Variations [ + ]
Cartridge Assignments Models: DRBO, DRBR, PVDB, QCDB, QCDD, DRBN, PVDA, QCDA, QCDC, PSDB, DRBM, DRBP, PSDL, PSDP, PSDT, PVDH, QCDE, Views: A,B,C,EModels: DRBO, DRBR, PVDB, QCDB, QCDD, DRBN, PVDA, QCDA, QCDC, PSDB, DRBM, DRBP, PSDL, PSDP, PSDT, PVDH, QCDE, Views: A,B,C,E
Cartridge Assignments Models: XMOA, Views: A,B,CModels: XMOA, Views: A,B,C
Cartridge Assignments Models: XMOB, View: AModels: XMOB, View: A
Used With [ + ]

What models can this kit be used with?

  • CVCV Vented pilot-to-open check valve
  • CWCA 3:1 pilot ratio, vented counterbalance valve
  • CWCG 5:1 pilot ratio, vented counterbalance valve
  • CWCK 1:1 pilot ratio, vented counterbalance valve
  • CWCL 2:1 pilot ratio, vented counterbalance valve
  • DKDP Normally closed, balanced poppet, logic element - pressure adjustable
  • DKDR Normally closed, balanced poppet, logic element - vent-to-open
  • DKDR8 Normally closed, balanced poppet, logic element with integral T-8A control cavity - vent-to-open
  • DKDS Normally closed, balanced poppet, logic element - pilot-to-open
  • DODP Normally open, balanced poppet, logic element - pressure adjustable
  • DODR Normally open, balanced poppet, logic element - vent-to-close
  • DODR8 Normally open, balanced poppet, logic element with integral T-8A control cavity - vent-to-close
  • DODS Normally open, balanced poppet, logic element - pilot-to-close
  • DPBM 2-way, pilot-operated, directional valve with drain to port 4 - normally open
  • DPBN 2-way, pilot-operated, directional valve with drain to port 4 - normally closed
  • DPBO 3-way, pilot-operated, directional valve with drain to port 4 (1 blocked, 2 to 3 open)
  • DPBP 3-way, pilot-operated, directional valve with drain to port 4 (1 to 2 open, 3 blocked)
  • DRAX 2-way, pilot-to-shift directional valve with drain to port 4 - normally closed
  • DRAY 2-way, pilot-to-shift directional valve with drain to port 4 - normally open
  • DRBM 2-way, direct-acting, directional valve with drain to port 4 - normally open
  • DRBMX 2-way, direct-acting, fixed setting, directional valve with drain to port 4 - normally open
  • DRBN 3-way, direct-acting, directional valve with drain to port 4 - normally closed
  • DRBNX 2-way, direct-acting, fixed setting, directional valve with drain to port 4 - normally closed
  • DRBO 3-way, direct-acting, directional valve with drain to port 4 (1 blocked, 2 to 3 open)
  • DRBOX 3-way, direct-acting, fixed setting, directional valve with drain to port 4 (1 blocked, 2 to 3 open)
  • DRBP 3-way, direct-acting, directional valve with drain to port 4 (1 to 2 open, 3 blocked)
  • DRBPX 3-way, direct-acting, fixed setting, directional valve with drain to port 4 (1 to 2 open, 3 blocked)
  • DRBR 3-way, direct-acting, directional valve with drain to port 4 (3 to 4 open, port 2 blocked)
  • DRBRX 3-way, direct-acting, fixed setting, directional valve with drain to port 4 (3 to 4 open, port 2 blocked)
  • DVBM 2-way, vent-to-operate, directional valve with drain to port 4 and integral T-8A control cavity - normally open
  • DVBN 2-way, vent-to-operate, directional valve with drain to port 4 and integral T-8A control cavity - normally closed
  • DVBO 3-way, vent-to-operate, directional valve with drain to port 4 and integral T-8A control cavity (1 blocked, 2 to 3 open)
  • DVBP 3-way, vent-to-operate, directional valve with drain to port 4 and integral T-8A control cavity (1 to 2 open, 3 blocked)
  • FKBA 2-way, pilot-shifted, proportional throttle
  • FKBB 2-way, pilot-shifted, proportional throttle with bleed down
  • FKCA 2-way, pilot-shifted, proportional throttle, high capacity
  • FKCB 2-way, pilot-shifted, proportional throttle with bleed down, high capacity
  • FVCA Ventable, fixed-orifice, bypass/restrictive, priority flow control valve
  • FVCA8 Ventable, fixed-orifice, bypass/restrictive, priority flow control valve with integral T-8A control cavity
  • HVCA Ventable, pilot-operated, balanced piston relief valve - before check
  • HVCA8 Ventable, pilot-operated, balanced piston relief main stage with integral T-8A control cavity - before check
  • LPDS Normally open modulating element with shuttle
  • LRDS Normally closed modulating element with shuttle
  • PSDB Direct-acting, pressure reducing/relieving valve with drain to port 4
  • PSDL Electro-proportional, direct-acting, pressure reducing/relieving valve with open transition and drain to port 4
  • PSDP Electro-proportional, direct-acting, pressure reducing/relieving valve with drain to port 4
  • PSDT Direct-acting, pressure reducing/relieving main stage piloted from port 4
  • PVDA Pilot-operated, pressure reducing/relieving valve with drain to port 4
  • PVDA8 Pilot-operated, pressure reducing/relieving main stage with integral T-8A control cavity and drain to port 4
  • PVDB Ventable, pilot-operated, pressure reducing/relieving valve
  • PVDD Ventable, pilot-operated, pressure reducing/relieving valve with drilled piston orifice
  • QCDA 15%, accumulator sense, pump unload valve with check - pilot capacity
  • QCDB 20%, accumulator sense, pump unload valve with check - pilot capacity
  • QCDC 30%, accumulator sense, pump unload valve with check - pilot capacity
  • QCDD 50%, accumulator sense, pump unload valve with check - pilot capacity
  • RVCD Ventable, pilot-operated, balanced piston relief valve with drain to port 4
  • RVCD8 Ventable, pilot-operated, balanced piston relief main stage with integral T-8A control cavity and drain to port 4
  • XMBA Port 1 to 3 open, ports 2 and 4 blocked, cavity plug
  • XMCA All ports blocked cavity plug
  • XMOA Ports 3 and 4 or port 5 and 6 blocked, all other ports open cavity plug
  • XMOB All ports open cavity plug
Notes [ + ]
  • Install back-up rings and O-rings as shown in views.
  • See installation variations for models associated with alternative installation 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.
Additional Resources [ + ]