With uni-directonal pumping screw. Dual seal remains closed in case of barrier pressure failure and closes in the event of pressure reversal. With guide sleeve (item no. 12). Operation as single seal with quench possible. Encapsulated stationary seat on the product side (bursting protection). Parted seal sleeve for application of highly restistant materials e.g. Hastelloy®.

Item Part no. to
DIN 24250
1.1.1 472.1 Seal face
1.1.2 474 Thrust ring
1.1.3 477.1 Spring
1.2 475.1 Seat
2 523 Shaft sleeve
4 513 Insert
8 160 Cover plate
9 509 Spring carrier
12 Spring protection sleeve
19 Plug
24 Assembly fixture



  • Cartridge
  • Balanced
  • Independent of direction of rotation
  • Stationary multiple springs
  • Spring protection sleeve
  • Variant for operation with pressureless quench available (HRC2000N)
  • Dual seal with and without pumping screw (HRC3300NF, HRC3300N) available


  • Insensitive to solids containing media. Solids content 40 % (single seal), 60 % (double seal)
  • Springs protected from product and leakage
  • Variant with short installation length to meet limited space conditions (HRC1100N)
  • Dual seal remains closed in case of barrier pressure failure, self-closing at pressure reversal (HRC3300NF)
  • Operation under vacuum without seat locking possible
  • No damage of the shaft by dynamically loaded O-Ring
  • Insensitive to shaft deflections due to stationary design

Operating range

Shaft diameter:
d10 = 30 ... 60 mm (1.181"... 2.362")
Pressure: p1 = 23 bar (334 PSI)
t = -20 °C ... +160 (200*) °C
(-4 °F ... +320 (382*) °F)
Sliding velocity: vg = 20 m/s (66 ft)
Axial movement: ±1.0 mm

* Due to shrinking


Seal face: Silicon carbide (Q1, Q2)
Seat: Carbon graphite antimony impregnated (A), Silicon carbide (Q1, Q2)

Standards and approvals

  • DIN 24960 C

Product variants

Single seal

Same design as HRC1000N, but with a shorter cover plate featuring integral spring and drive pin pockets (Item no. 8). No adapter (Item no. 9). Shaft sleeve (Item no. 2) uncoated. Differs from modular system!
Single seal with pressureless quench for cooling, featuring guide sleeve (Item no. 12) baffle (Item no. 17), adapter (Item no. 15) and lip seal (Item no. 13) on the atmosphere side. Option: Throttle ring for sealing steam quench on the atmosphere side.