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3 Product description
Item
Designation
22
Hexagon bolt
A
Motorized actuator
C
CONEXO label with RFID
chip
0
Earthing kit for ATEX ver-
sion
0-1
Stranded wire (ATEX ver-
sion)
0-2
Cable lug (ATEX version)
23
Hexagon bolt
* available as spare part
3.2 Additional design features
Double-eccentric design
Trace of the disc
f
During operation, the disc directly disconnects from the seat,
thereby reducing friction between the seat and disc, as well as
the torque.
This design is particularly low-wear and this, together with the
temperature-resistant carbon bushing, increases the service
life.
Spherical surface
The disc is designed with a spherical surface for improved
mechanical behaviour under pressure and temperature fluctu-
ations.
Shaft blow-out protection
There is a chamfer at the upper end of the shaft which acts as
an additional safety measure in case the shaft breaks.
GEMÜ R478 Tugela
Material
Stainless steel
Stainless steel
Shaft axis
Flow central line
Flow direction
Flow direction*
* Indicated by an arrow on the product
Shut-off seal material
TFM™ is made from conventional PTFE and a 1% proportion
of perfluoropropyl vinyl ether (PPVE). While the properties of
conventional PTFE (excellent chemical resistance, application
in a wide temperature range and resistance to embrittlement
or ageing, etc.) are maintained, the PPVE additive leads to a
better distribution of the PTFE particles and thus to a higher
density of the polymer structure.
This leads to the following additional advantages:
• Significantly improved cold flow properties (measured as de-
formation under load):
The same cold flow properties as PTFE with 25% glass fibres.
• Reduced gas permeability and increased blocking properties
• The smooth surface results in less abrasion of the shut-off
seal and fewer abraded particles in the medium.
3.3 Description
The GEMÜ R478 Tugela double-eccentric metal butterfly valve
is operated by a motorized actuator. The butterfly valve is
available in nominal sizes DN 50 to 300 and in standardized
installation lengths API 609 category A (DIN 3202 K1).
3.4 Function
The product controls or regulates (depending on version) a
flowing medium by being closed or opened by a motorized ac-
tuator.
6 / 56
www.gemu-group.com
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