Page 84 - Catalogue 2019
P. 84
QUALITY FEATURES
PTFE-VALVE T 211-C
TOP FLANGE DESIGN
with centering projection and
double flat shaft end according to
EN ISO 5211.
SHAFT BEARING
All nominal diameters have
a multiple, maintenance-
free shaft bearing.
FUNCTIONAL SAFETY SEAL
SURFACES The one-piece, blow-out
The functional surfaces proof shaft/disc is coated
of the shaft seal are with PFA including the safety
machined to precise seal. The disc is covered
tolerances. Forcible with at least 3mm. All sealing
adaptation is damaging surfaces are machined.
due to the resilience of
PTFE and is avoided in
this design.
PTFE LINER
The PTFE liner is isostatically
pressed and at least 3mm
thick. The broad, chambered
sealing strips also serve as a
double-sided flange seal.
BALL PRINCIPLE
The proven seal according
to the ball principle between
disc and PTFE liner ensures DOUBLE SEALS
reliable long-term operation, Double seals as standard on both shaft
without critical transitions. ducts. Primary seal (= main seal) achieved
by prestressing through maintenance-free
set of stainless steel disc springs.
Secondary seal (= EBRO safety seal)
is safely achieved through a matched
combination of a PTFE-Chevron seal and
an additional O-ring.
