
69
Single mechanical seal without flushing
A.0500.251 – IM-TL/13.00 EN (08/2009)
With flushing
Without flushing
Design
• Balanced mechanical seal.
• The stationary seal face is built into the seal cover, which is assembled in the
rotor case from the front end, and is locked against rotation by the friction forces of
two O-rings.
• The spring loaded rotating seal face is assembled into the driver which is locked on
the shaft sleeve by means of set screws. The seal face is locked in the driver by
means of lips and slots.
• Suitable for two directions of rotation.
• Small seal faces prevent solidifying of medium between faces (reduced seal faces so
called ‘‘knife edge seals’’ are available on demand).
• Seal faces are mounted flexibly in O-rings.
• Seal faces are available in two different material combinations.
• Enclosed spring outside of pumped medium (can be flushed).
• Low pressure quench or flushing is possible if the pump is equipped with the flush
cover including extra lip seals.
Technical data
Materials of mechanical seal faces:
GW1 and GW2: SiC (Q1) - SiC (Q1)
GB1 and GB2: SiC (Q1) - Carbon (B)
Materials of O-rings:
Fluorocarbon FPM
EPDM (E)
EPDM-FDA (E1 i.e.certified food quality)
PTFE lined (T)
Perfluor Chemraz
®
(C)
* Perfluor Kalrez
®
(K)
Material of lip ring (optional):
Nitrile rubber (P)
Maximum temperature:
200°C or up to the temperature limit of the pump
Maximum pressure:
23 bar or up to the operating pressure limit of
the pump
Hydrostatic test pressure:
25 bar (for mechanical seal)
Maximum pressure of
quench/flushing medium:
0.5 bar
7.0 Single mechanical seal
7.1 General information
* Kalrez is a registered trademark of DuPont Performance Elastomers.