Welcome to The Kraissl Company

THREE PIECE DUPLEX STRAINER & FILTER

MODEL 72AFS and 72AFHS SERIES
CAST STEEL OR STAINLESS STEEL — PRESSURE RANGE 200 TO 720 PSIG

PURPOSE
Kraissl pipeline strainers and filters protect pumps, nozzles, valves, heat exchangers and other expensive pipeline equipment from harmful flow 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.

» 72AFS & 72AFHS 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
DESIGN SPECIFICATIONS
Model 72AFS and 72AFHS series three piece duplex strainers are furnished in both standard or high pressure models with flanged port connections. The center valve section or side bodies can be separately removed and serviced independently. Threaded NPT, socket weld or butt weld end 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 have stud-and-nut/bolted body cover closures. Materials of construction include rugged cast carbon steel bodies, covers, and 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. All stainless steel models are also available in cast 316 stainless steel, 304 stainless steel or other special stainless alloys.

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 basked 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 ("H") 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 inch through 1 1/2 inch inclusive - 100 psig; 2 inch through 3 inch - 80 psig; 4 inch through 8 inch- 15 psig.

An optional lifting jack can be provided to lift the valve plug off its seat for ease in valve turning in rough service on sizes 1 through 4 inch. A lifting jack is standard on 5, and 8 inch sizes.
KRAISSL CAST STEEL* THREE PIECE DUPLEX STRAINERS

 

MODEL 72A(F)S SERIES - CLASS 150
HAND CLAMP (YOKE) CLOSURE
For Standard Pressure to 200 PSIG

MODEL 72A(F)HS SERIES - CLASS 300**
STUD AND NUT COVER CLOSURE
For High Pressure to 720 PSIG
OUTLINE DIMENSIONS
CATalog
NAVigator		 MODEL
NUMBER		 PIPE
SIZE		 APROX
NET WGT. LBS		 A B C D E F G H J K
CL 150 CL 300 CL 150 CL 300 CL 150 CL 300
72-33AFHS 1" 73 77 11 9/16 5 1/16 9 3/8 9 3/8 15 1/4 2 1/8 1 1/4 14 3/8 7/16 12 1/8 4 15/16 4 15/16
72-37AFHS 1 1/2" 93 100 13 1/2 7 9 3/8 9 3/8 16 7/8 2 3/8 1 1/2 16 7/16 12 1/8 4 15/16 4 15/16
72-39AFHS 2" 165 173 15 7 7/8 12 12 22 3/4 3 1 7/8 21 3/4 9/16 12 1/8 6 1/4 6 1/4
72-41AFHS 2 1/2" 209 218 16 7/8 9 3/4 12 5/8 12 5/8 25 5/8 3 1 7/8 24 9/16 9/16 12 1/8 6 1/2 6 1/2
72-43AFHS 3" 250 263 17 1/16 9 13/16 12 1/2 12 1/2 29 1/2 3 1/4 2 28 1/4 9/16 12 1/8 6 7/8 6 7/8
72-47AFHS 4" 325 339 20 3/4 13 1/2 15 5/8 15 5/8 31 1/2 3 1/4 2 30 3/8 9/16 12 1/8 9 9
72-49AFHS 5" 670 - 23 13 1/2 18 18 42 9/16 2 3/4 4 41 9/16 9/16 14 10 1/8 10 1/8
72-51AFHS 6" 790 - 26 1/4 16 1/4 21 21 44 9/16 2 3/4 4 43 9/16 9/16 14 12 12
Dimensions are in inches and subject to casting and production variations.

*ASTM A126 - Cast Carbon Steel, Cast 304 SS - ASTMA351-CF8, Cast 316 SS-ASTM 351-CF8M
**Special Model 72FHS-150 series with Class 150 Flanges for 230 psig. and Model 72AFHS-600 series for 1480 psig Max. W.P. also available.

Please contact factory. A lifting jack is standard on 5" and 6" sizes. 5" and 6" sizes not listed by Underwriters' Laboratories, Inc.

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.

OTHER PRODUCTS
Our product lines of cast iron, bronze, aluminum, steel and stainless steel simplex and duplex strainers including NPT cast iron models are covered in separate bulletins. Units can also be furnished in other special metals and higher pressure/temperature ratings.
DOUBLE ELEMENT BASKET DATA
The open area ratios of two perforated metal sizes are given below. Baskets are available in all standard perforations and meshes. Filter baskets are made of wire mesh cloth spot welded over supporting cylinder of perforated metal.
Model #
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.**
72-33AF(H)S 1 0.864 1 15/16 3 15/16 26.9 10.8 7.5 12.5:1 8.7:1
72-37AF(H)S 1 1/2 2.036 2 9/16 5 45.4 18.2 12.7 12.2:1 8.5:1
72-39AF(H)S 2 3.355 3 1/2 5 1/8 66.0 26.4 18.5 7.9:1 5.5:1
72-41AF(H)S 2 1/2 4.788 4 1/8 6 1/4 94.4 37.8 25.4 7.9:1 5.5:1
72-43AF(H)S 3 7.393 4 1/8 7 101 40.4 28.3 5.5:1 3.8:1
72-47AFHS 4 12.73 7 1/8 11 149 59.6 41.7 4.7:1 3.3:1
72-49AFHS 5 20.01 6 7/8 9 1/4 237 94.8 66.4 4.7:1 3.3:1
72-51AFHS 6 28.89 6 7/8 12 296 118 82.9 4.7:1 3.3:1
*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

3 PIECE DUPLEX STRAINERS & FILTERS — Model 72AFS & 72AFHS 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