KRAISSL
DUPLEX STRAINERS AND FILTERS
MODEL 72 and 72H SERIES - CAST IRON - NPT PORTS
Pressure Range 200 to 400 PSIG
(click on picture for larger)
PURPOSE
Kraissl pipeline strainers and filters
protect pumps, nozzles. valves, heat exchangers and other expensive
pipeline equipment from harmful contamination by catching dirt and
debris.
APPLICATION
Kraissl duplex strainers and filters
provide a simple, cost effective way to separate particle impurities
from fluid systems. Duplex strainers are ideal for applications where
continuous flow must be maintained, with no flow interruption for basket
cleaning.
Kraissl strainers are listed by Underwriters Laboratories, Inc. (U.L.),
and are individually tested to U. L. quality control specifications.
These cast pipeline strainers are manufactured according to
international standard A.S.T.M. F1199 for use in industrial and marine
applications.
DESIGN SPECIFICATIONS
Model 72 and 72H series duplex strainers
are furnished in both standard or high pressure models with NPT port
connections. Flanged models are also available, described in other
bulletins. Internal channels are 100% full-flow, having the same
cross-sectional area as the equivalent pipe size. Standard pressure
models are furnished with our quick-opening, hand-clamp closure for easy
access. High pressure models are furnished with stud-and-nut body cover
closure. Refer to our drawings A2333A and A2334A for sizes, ratings and
dimensions.
Materials of construction Include rugged cast iron bodies, covers, and
valve plugs, and brass, carbon steel, stainless steel or monel baskets.
Special valve plugs can also be furnished in stainless steel or other
materials.
These duplex strainers have a built-in, tapered plug valve that directs
flow through either side without shutting off the flow. A valve handle
guard shields the side in use. The standard valve handle swings over the
inlet port. Special reverse valve handles that swing over the outlet
port can also be furnished. Drain plugs are provided in each of the
valve and basket chambers. An adjustable locking flange holds the valve
plug on its seat. A separate, external gland is provided to allow easy
access to valve stem packing without complete disassembly, even while in
service.
Strainer baskets are fabricated from perforated metal. The smallest
common perforation size is 1/64 inch in brass and 1/32 inch in stainless
steel. Filter baskets are manufactured by using fine mesh wire cloth
over supporting perforated metal. Interchangeable strainer, filter and
double element baskets provide a flexible range of operating choices.
The basket is held on its seat by a spring basket handle. Normal flow is
through the interior of the basket which then contains the collected
debris when the basket is lifted out for cleaning. Reverse flow is also
possible if desired. Magnet inserts are available to help eliminate fine
metallic ferrous particles.
All high pressure models with stud-and-nut closure are supplied with
balancing valve assemblies to equalize pressure and ease valve turning.
These should be specified on standard pressure models when used above
the following pressures: 3/4" through 1-1/2" inclusive, 80
psig; 2" & 2-1/2', 80 psig.
An optional lifting jack can be provided to lift the valve plug off its
seat for ease in valve turning in rough service.
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Albert
Sterling & Associates, Inc.
