Duplex Strainer

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.


KRAISSL CAST IRON* DUPLEX STRAINERS
THREADED (NPT) PORTS
*ASTM A126 Class B



MODEL 72 SERIES
HAND CLAMP (YOKE) CLOSURE
For Standard Pressure to 200 psig
MOD
NO		 PIPE
SIZE
NPT		 APPROX
NET WGT
LBS		 A B C D E F G H J K
72-31D 3/4 33 10 1/8 5 1/16 5 1/4 10 7/8 2 1/4 1 1/2 10 1/8 7/16 8 1/8 2 3/4
72-33D 1 33 10 1/8 5 1/16 5 1/4 10 7/8 2 1/4 1 ½ 10 1/8 7/16 8 1/8 2 ¾
72-31 3/4 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-33 1 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-35 1 1/4 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-37 1 1/2 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-39 2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
72-41 2 1/2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
Dimensions are in inches and subject to casting and production variations.



MODEL 72H SERIES
STUD AND NUT COVER CLOSURE
For High Pressure to 400 psig
MOD
NO		 PIPE
SIZE
NPT		 APPROX
NET WGT
LBS		 A B C D E F G H J K
72-31H 3/4 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-33H 1 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-35H 1 1/4 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-37H 1 1/2 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-39H 2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
72-41H 2 1/2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
Dimensions are in inches and subject to casting and production variations.


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.**
72-31D 3/4 0.533 1 15/16 3 15/16 26.9 10.8 7.5 20.3:1 14.1:1
72-33D 1 0.864 1 15/16 3 15/16 26.9 10.8 7.5 12.5:1 8.7:1
72-31(H) 3/4 .533 1 15/16 3 15/16 26.9 10.8 7.5 20.3:1 14.1:1
72-33(H) 1 .864 1 15/16 3 15/16 26.9 10.8 7.5 12.5:1 8.7:1
72-35(H) 1 1/4 1.495 2 9/16 5 45.4 18.2 12.7 12.2:1 8.5:1
72-37(H) 1 1/2 2.036 2 9/16 5 45.4 18.2 12.7 8.9:1 6.2:1
72-39(H) 2 3.355 3 1/2 5 1/8 66.0 26.4 18.5 7.9:1 5.5:1
72-41(H) 2 1/2 4.788 3 1/2 5 1/8 66.0 26.4 18.5 5.5:1 3.9:1
*Based on 40% open area. **Based on 28% open area.
 

 

  

 
 

Sales & Orders

    


Request for Information
 

Los Angeles office)
Fax: (310) 578-9376

Los Angeles
Fax: (310) 578-8262

Email
Wagnerhydr@aol.com
 

 

  

 

DuplexStrainers Duplex Strainer

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.


KRAISSL CAST IRON* DUPLEX STRAINERS
THREADED (NPT) PORTS
*ASTM A126 Class B



MODEL 72 SERIES
HAND CLAMP (YOKE) CLOSURE
For Standard Pressure to 200 psig
MOD
NO		 PIPE
SIZE
NPT		 APPROX
NET WGT
LBS		 A B C D E F G H J K
72-31D 3/4 33 10 1/8 5 1/16 5 1/4 10 7/8 2 1/4 1 1/2 10 1/8 7/16 8 1/8 2 3/4
72-33D 1 33 10 1/8 5 1/16 5 1/4 10 7/8 2 1/4 1 ½ 10 1/8 7/16 8 1/8 2 ¾
72-31 3/4 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-33 1 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-35 1 1/4 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-37 1 1/2 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-39 2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
72-41 2 1/2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
Dimensions are in inches and subject to casting and production variations.



MODEL 72H SERIES
STUD AND NUT COVER CLOSURE
For High Pressure to 400 psig
MOD
NO		 PIPE
SIZE
NPT		 APPROX
NET WGT
LBS		 A B C D E F G H J K
72-31H 3/4 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-33H 1 42 12 1/4 5 5/8 6 3/4 14 1/2 2 3/4 1 3/4 13 1/2 7/16 12 1/8 3 5/8
72-35H 1 1/4 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-37H 1 1/2 56 13 1/4 6 3/4 7 5/8 15 1/4 2 3/4 1 3/4 14 1/4 7/16 12 1/8 3 7/8
72-39H 2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
72-41H 2 1/2 115 14 3/4 7 7/8 10 5/8 20 1/2 3 1 7/8 19 1/2 9/16 12 1/8 5 9/16
Dimensions are in inches and subject to casting and production variations.


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.**
72-31D 3/4 0.533 1 15/16 3 15/16 26.9 10.8 7.5 20.3:1 14.1:1
72-33D 1 0.864 1 15/16 3 15/16 26.9 10.8 7.5 12.5:1 8.7:1
72-31(H) 3/4 .533 1 15/16 3 15/16 26.9 10.8 7.5 20.3:1 14.1:1
72-33(H) 1 .864 1 15/16 3 15/16 26.9 10.8 7.5 12.5:1 8.7:1
72-35(H) 1 1/4 1.495 2 9/16 5 45.4 18.2 12.7 12.2:1 8.5:1
72-37(H) 1 1/2 2.036 2 9/16 5 45.4 18.2 12.7 8.9:1 6.2:1
72-39(H) 2 3.355 3 1/2 5 1/8 66.0 26.4 18.5 7.9:1 5.5:1
72-41(H) 2 1/2 4.788 3 1/2 5 1/8 66.0 26.4 18.5 5.5:1 3.9:1
*Based on 40% open area. **Based on 28% open area.
 

 

  

 
 

Sales & Orders

    


Request for Information
 

Los Angeles office)
Fax: (310) 578-9376

Los Angeles
Fax: (310) 578-8262

Email
Wagnerhydr@aol.com