Pure-Flo®

68 STERILE TANK VENT FILTER SHUNT VALVE
The Sterile Tank Vent Filter Shunt Valve is a steam traced
2-Way divert valve designed to provide the flexibility of
changing from one vent filter cartridge to another on
WFI storage tanks without interrupting operations.
Changing a vent filter cartridge on WFI tank while the
system is in operation is normally not possible due to the
likelihood of contaminates entering the tank. Smaller systems
can be shut down for a short period of time, and
with the use of sterilizable upstream block diaphragm
valve, restarted after steam sterilization of the housing,
cartridge, connecting tubing, and upstream section of the
valve. Large systems designed for continuous use require
two separate vent filtration units. Sherotec now offers a
sterilizable tank bent shunt valve assembly mounted on a
single nozzle designed for this specific purpose. A steam
traced version of this valve is also available which, when
used in conjunction with a steam jacketed filter housing,
will prevent condensation from forming inside the housing.
The assembly consists of two diaphragm valves with
a common downstream port. The upstream side of the
valves are connected to the two filter housings. The common
port is connected to the tank vent nozzle. A steam
condensate discharge port is positioned tangential to the
weir of both valves. Two additional diaphragm valves are
used to close the condensate port after sterilization.
These valves in turn are connected to a steam trap which
then goes to drain.
MATERIALS AND SPECIFICATIONS
• 316L Stainless Steel, ASTM A479 wrought bodies, sizes
1.0" through 4.0".
• Standard ANSI 316L Stainless Tubing up to 4".
• Assembly available with FDA compliant PTFE and EPDM
diaphragms.
• Interior surface finishes available with mechanical finishes
from 11μ in. R a to 35μ in. R a . Electropolish over
mechanical services is also available.
• PAS, stainless steel, nylon coated, PVDF coated or white
epoxy coated manual bonnet assemblies are available.
• Diaphragm-driven pneumatic Advantage Actuators are
available.