Series 2 - T-3A cavity, buna-N, cartridge seal kit

990303007 : Series 2 - T-3A 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 2
Cartridge Thread 1"-14 UNS1"-14 UNS
Valve Hex Size 1 1/8 in.28,6 mm
Valve Installation Torque 45 - 50 lbf ft61 - 68 Nm
Cavity T-3A
Used With [ + ]

What models can this kit be used with?

  • RDFA Direct-acting relief valve
  • RDFA3 Non-adjustable direct-acting relief valve
  • RDFT
    Direct-acting relief valve, CE marked
  • RPGS Pilot-operated, balanced poppet relief valve
  • RPGS8 Pilot-operated, balanced poppet relief main stage with integral T-8A control cavity
  • RPGT Anti-Shock, pilot-operated, balanced poppet relief valve
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.
  • After installing the GLYD® Ring, size it to restore original shape and to prevent damage during cartridge installation.
  • When installing cartridge - be sure to torque to recommended value.
  • GLYD® Ring is a registered trademark of W. S. Shamban and Co., Los Angeles, CA, USA
Additional Resources [ + ]