Series 1 - T-31A cavity, Polyurethane cartridge seal kit

990031002 : Series 1 - T-31A cavity, Polyurethane 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.
  • Polyurethane seals have a higher tensile strength, are more abrasion/extrusion resistant, and are well suited for high cycle and high pressure applications.
Technical 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-31A
Used With [ + ]

What models can this kit be used with?

  • DSCH Low side, 3-position, hot oil shuttle valve
  • DSCL Direct-acting, low side, 3-position, shuttle valve
  • DSCO Spring offset, 2-position, high side shuttle valve
  • DSCS High side, 3-position, shuttle valve
  • DSCX 3-way, 2-position, vent-to-shift diverter valve, normally closed
  • DSCY 3-way, 2-position, vent-to-shift diverter valve, normally open
  • FSAA High accuracy, closed center, flow divider-combiner valve
  • FSAS High accuracy synchronizing, flow divider-combiner valve
  • FSBA High accuracy, closed center, flow divider-combiner valve
  • FSBD High accuracy flow divider valve
  • FSBS High accuracy synchronizing, flow divider-combiner valve
  • FSCA Closed center, flow divider-combiner valve
  • FSCD Flow divider valve
  • FSCH High capacity, closed center, flow divider-combiner valve
  • FSCS Synchronizing, flow divider-combiner valve
  • LHDA Bypass/restrictive, priority modulating element
  • LHDT Normally open, bi-directional, modulating element
  • XRCA All ports blocked cavity plug
Notes [ + ]
  • 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.
Additional Resources [ + ]