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for High-Load Use

Mechanical Seals for Pumps
Pusher Seals

  • Suitable for higher speeds
  • Good followability due to no influence from run-out, squareness or vibration of the shaft
  • Compact design
  • Low heat generation and power consumption due to narrow seal face width
  • Longer seal life
  • Pressure-balanced design prevents mating ring being forced out under reverse pressure
  • No damage to shaft sleeve as dynamic O-Ring is not in direct contact with the sleeve


  • API 682 Category 2 and 3, Type A, Arrangement 1 seal
  • Single seal
  • Balanced
  • Cartridge unit
  • Stationary multiple springs
  • Solid seal faces

Product specification example

Standards and approvals

API 682 / ISO 21049


Seal ring: Blister resistant carbon, Silicon carbide SSiC (Q1), RBSiC (Q2)

Mating ring: Silicon carbide SSiC (Q1), RBSiC (Q2)

Secondary seals: FKM (V), FFKM (K), EPDM (E), NBR (P)

Springs: Hastelloy® C-276 (M5)

Metal parts: CrNiMo steel 316 (G)

Operating range

Pressure (product seal): p = vacuum … 60 bar ( … 870 PSI)

Temperature: -40 °C … +176 °C (-40 °F … +349 °F)*

Sliding velocity: vg = 50 m/s (164 ft/s)

Viscosity: … 300 mPa·s

Solids content: … 0.5 wt.%

* Engineered up to 260 °C (500 °F) with FFKM (K) secondary seals

Recommended applications

Refining technology

Oil and gas industry

Petrochemical industry

Chemical industry

Power plant technology

Light volatile hydrocarbons

LPG plants API 610 / ISO 13709 pumps

Process pumps

Recommended piping plans

Process side: 01, 02, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41

Atmospheric side: 51, 61, 62, 65A, 65B, 66A, 66B

Applicable ranges shown in the product introduction are limit values for each standard material.
Applicable ranges, performance data and figures can serve only as a guide for selection and therefore in actual use there will be some cases where general specifications cannot be applied due to unknown factors or constraints.
Please check the applicability before use.
The contents are subject to change without notice for improvement.


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