Welcome to The Kraissl Company

DUPLEX STRAINERS & FILTERS

click picMODEL 72F and 72FH SERIES

CAST IRON FLANGED PORTS
Pressure Range 200 TO 400 PSIG

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.

DOUBLE ELEMENT BASKETS
These strainers can be provided with our patented double-element baskets which are easily disassembled for cleaning, and provide greater straining areas in the same housing. Double-element baskets are listed by Underwriters Laboratories, Inc. for a variety of sizes.

» 72F & 72FH Brochure (PDF file)

CAST STEEL* DUPLEX STRAINERS

FEATURES

1 - Hand clamp requires no special tools on low pressure models.
2 - Valve handle shields side in use.
3 - Accessible swing yoke closure for easy basket cleaning.
4 - Continuous flow without interruption during changeover.
5 - Tapered valve plug for durability.
6 - Drain connections on each basket chamber.
7 - Interchangeable strainer, filter and double element baskets.
8 - Bodies individually pressure tested to UP specifications.
9 - Spring handle holds basket on seat.
10 - Independent gland for external stem packing access.
11 - Adjustable locking flange establishes valve clearance.
12- Mounting feet provided



CAST STEEL* DUPLEX STRAINERS

APPLICATION
Model 72F and 72FH series duplex strainers are furnished in both standard or high pressure models with standard ANSI B16.1 flanged port connections. Threaded NPT 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 for easy access. High pressure models are furnished with stud-and-nut body cover closure.

Materials of construction include rugged cast iron bodies and covers, iron valve plugs, and brass, carbon steel, stainless steel or monel baskets. Special valve plugs can also be furnished in bronze, 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 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 - 100 psig; 2" & 2 1/2" - 80 psig; 4" through 8" - psig.
An optional lifting jack can be provided to lift the valve plug off its seat for ease in valve turning in rough service. A lifting jack is standard on 5", 6", and 8" sizes.
KRAISSL CAST IRON* DUPLEX STRAINERS - FLANGED PORTS
MODEL 72F SERIES - CLASS 125
HAND CLAMP (YOKE) CLOSURE
For Standard Pressure to 200 psig
MODEL 72FH SERIES -
CLASS 250**
STUD AND NUT COVER
CLOSURE
For High Pressure to 400 psig
OUTLINE DIMENSIONS
CATalog
NAVigator
MODEL
NO
PIPE
SIZE
NPT
APPROX
NET WGT
LBS
A
B
C
D
E
F
G
H
J
K
CatNav 72-31F(H) 3/4 42 12 1/4 5 5/8 8 3/8 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 4 5/8
CatNav 72-33F(H) 1 43 12 1/4 5 5/8 8 3/8 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 4 5/8
CatNav 72-35F(H) 1 1/4 56 13 1/4 6 3/4 9 3/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 4 3/4
CatNav 72-37F(H) 1 1/2 57 13 1/4 6 3/4 9 3/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 4 3/4
CatNav 72-39F(H) 2 115 14 3/4 7 7/8 10 3/8 20 3/4 3 1 7/8 19 1/2 9/16 12 1/8 6 7/32
CatNav 72-41F(H) 2 1/2 117 14 3/4 7 7/8 10 3/8 20 3/4 3 1 7/8 19 1/2 9/16 12 1/8 6 7/32
CatNav 72-43F(H) 3 141 17 5/8 10 3/4 12 1/2 20 3/4 3 1 7/8 19 1/2 9/16 12 1/8 6 7/8
CatNav 72-47F(H) 4 310 20 11/16 13 1/32 15 5/8 25 1/4 3 1/4 2 24 5/8 12 1/8 8 15/16
CatNav 72-49F(H)*** 5 380 26 1/8 15 3/8 17 3/4 27 3/4 3 1/4 2 26 1/2 5/8 14 9 7/8
CatNav 72-51F(H)*** 6 595 28 1/2 16 1/4 21 36 3/4 4 1/2 2 3/4 35 1/2 9/16 14 12
CatNav 72-53F(H)*** 7 1600 37 5/16 15 9/16 32 1/2 47 3/8 10 3/4 9 47 5/8 14 15 1/2
Dimensions are in inches and subject to casting and production variations.

*ASTM A126 Class B
**Special Model 72FH-125 series also available
with stud and nut closure with Class 125 Flanges for 200 psig.
*** A lifting jack is standard on these sizes
DOUBLE ELEMENT BASKETS
These units can be supplied with out patented double-element baskets which are easily disassembled for cleaning and provide greater straining areas in the same housing.
SINGLE ELEMENT BASKET DATA
Use Double Element Baskets for greater straining area.
MODEL
NO.
INCH
PIPE
SIZE
INTERNAL
PIPE
AREA
SQ.IN
BASKET
DIMENSIONS
TOTAL
SCREEN
AREA

SQ.IN.
APPROX. OPEN
SCREEN AREA
SQ.IN.
RATIO OF OPEN
AREA
TO PIPE AREA
O.D.
LENGTH
1/16" HOLE
DIA.*
1/32" HOLE
DIA.**
1/16" HOLE
DIA.*
1/32" HOLE
DIA.**
72-31(D)F(H) 3/4 0.533 1 15/16 3 15/16 26.9 10.8 7.5 20.3:1 14.1:1
72-33(D)F(H) 1 0.864 1 15/16 3 15/16 26.9 10.8 7.5 12.5:1 8.7:1
72-35F(H) 1 1/4 1.495 1 15/16 6 3/8 45.4 18.2 12.7 12.2:1 8.5:1
72-37F(H) 1 1/2 2.036 1 15/16 6 3/8 45.4 18.2 12.7 8.9:1 6.2:1
72-39F(H) 2 3.355 3 1/2 5 1/8 66.0 26.4 18.5 7.4:1 5.5:1
72-41F(H) 2 1/2 4.788 3 1/2 5 1/8 66.0 26.4 18.5 5.5:1 3.9:1
72-43F(H) 3 7.393 3 1/2 8 3/8 102 40.8 28.6 5.5:1 3.9:1
72-47F(H) 4 12.73 4 1/8 10 1/2 149 59.6 41.7 4.7:1 3.3:1
72-49F(H) 5 20.006 5 13 224 89.6 62.7 4.5:1 3.1:1
72-51F(H) 6 28.891 7 11 1/2 291 116 81.5 4.0:1 2.8:1
72-53F(H) 8 50.03 9 16 516 266 144 4.1:1 2.9:1
*Based on 40% open area. **Based on 28% open area.
Copyright © 2008 ~ The Kraissl Company - Hackensack, NJ — American Manufacturer of Industrial/Commercial Strainers, Filters, Valves & Pumps

Duplex Strainer - Cast Iron Flanged Ports — Model 72F and 72FH Series
Twin Strainer ~ Double Strainer ~ Pipeline Strainer ~ Basket Strainer ~ Process Strainer ~ Industrial Strainer
Twin Filter ~ Double Filter ~ Pipeline Filter ~ Basket Filter ~ Process Filter ~ Industrial Filter