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  Wilo Suction Diffuser / Flow Inverter Technical Bulletin      W     I     L  -     I     O  -     M     V     I     S  -     0     0     1  -     1     0  2WIL-IO-MVIS001-10 1 Features / Advantages Diffuser - Provides ideal ow conditions for the pump providing NPSH require - ments are met. Diffuser orice cylinder serves as pump strainer with much more free area than conventional strainers. Direct Mounting  - Horizontal or vertical position. Flanges are Class 125# ANSI (ASA) at faced (For Class 300# anges consult factory). Start-Up Strainer - A necessity for hydronic systems and standard for suction diffusers for closed and domestic water systems. Remove it later without los - ing the protection of the larger perforations in the orice cylinder. Saves Time  - No intermediate piping. Fewer joints to make. Saves Space  - Eliminates long pipe entrance, conventional strainer, pipe saddle, and oor ange. Saves Money  - Diffuser, strainer … all in one piece. Fewer pipe joints. Faster  to install. Eliminates Trouble  - Good ow conditions promote trouble-free operation.  Angle Body - Provides a 90 degree elbow / strainer combination which facili -  tates a close transition between system return piping and the system pump suction. Table 1: Suction Diffuser Performance Characteristics 2 Operational Limits Maximum Working Pressure:175 psi (12 bar) standard for Ductile Iron ModelsMaximum operating Temperature:250°F (121°C) 3 Materials of Construction  1. Body: ASTM A536 Ductile Iron / Class 125 / 1502. O-Ring: Nitrile Rubber O-Ring3. Cover: ASTM A536 Ductile Iron4. Screen: 3/16” Perforated 304 Stainless Steel5. Start-up Screen: 20 Mesh 304 Stainless Steel6. Bolts: ASTM 304 Stainless Steel7. Nuts: ASTM 304 Stainless Steel8. Pipe Plugs: ASTM A536 Ductile IronFigure 1: Cross-Section of Suction Diffuser   7654321 A        B 8DEF        C 10987645322.9.8.7.6.5.4.3.25.2.15.11.52.5    P   r   e   s   s   u   r   e   L   o   s   s  -   F   e   e   t   o    f   W   a   t   e   r Flow - USGPM (70°F Water)           1        0        1        5        2        0        2        5        3        0        4        0        5        0        6        0        7        0        9        0        8        0        1        0        0        1        5        0        2        0        0        2        5        0        3        0        0        4        0        0        5        0        0        6        0        0        7        0        0        8        0        0        9        0        0        1        0        0        0        1        5        0        0        2        0        0        0        2        5        0        0        3        0        0        0        4        0        0        0        5        0        0        0        6        0        0        0        7        0        0        0        8        0        0        0        9        0        0        0        1        0  ,        0        0        0        1       ½       2        2       ½       345681      0      x       1      0       1       2      x      8       1       2      x       1      0       1       2      x       1       2 Outlet Size (in)  3Wilo MVIS - Installation and Operation Manual 4 Dimensions and Weights  Part NumberInlet/OutletA B CD E FNPT PlugPipe SupportWt. lbs27127092” x 1.5“4.50 (114)4.50 (114)6.88 (175)6.13 (156)9.38 (238)8.88 (226)3/41.00 (25)20 (9)27127102” x 2”4.50 (114)4.50 (114)6.88 (175)6.13 (156)9.38 (238)8.88 (226)3/41.00 (25)23 (10)27127112.5” x 2 “5.00 (127)5.00 (127)7.63 (194)6.50 (165)10.38 (264)9.38 (238)3/41.50 (38)30 (14)27127122.5” x 2.5”5.00 (127)5.00 (127)7.63 (194)6.50 (165)10.38 (264)9.38 (238)3/41.50 (38)35 (16)27127133” x 2”5.50 (140)5.50 (140)8.50 (216)7.13 (181)10.88 (276)9.38 (238)3/41.50 (38)42 (19)27127143” x 2.5”5.50 (140)5.50 (140)8.50 (216)7.13 (181)10.88 (276)9.38 (238)3/41.50 (38)48 (22)27127153” x 3”5.50 (140)5.50 (140)8.50 (216)7.13 (181)10.88 (276)9.38 (238)3/41.50 (38)52 (24)27127164” x 3”6.50 (165)6.50 (165)11.00 (279)8.75 (222)12.25 (311)11.13 (283) 1 1.50 (38)66 (30)27127174” x 4”6.50 (165)6.75 (171)11.00 (279)8.75 (222)12.25 (311)11.13 (283) 1 1.50 (38)72 (33)27127185” x 4”7.50 (191)7.50 (191)13.00 (330)14.88 (379)14.88 (379)14.50 (368) 1 1.50 (38)93 (42)27127195” x 5”7.50 (191)7.50 (191)13.00 (330)14.88 (379)14.88 (379)14.50 (368) 1 1.50 (38)100 (45)27127206” x 4”8.00 (203)8.00 (203)14.50 (368)10.50 (267)16.00 (406)16.25 (413) 1 1.50 (38)122 (55)27127216” x 5” 8.00 (203)8.00 (203)14.50 (368)10.50 (267)16.00 (406)16.25 (413) 1 1.50 (38)134 (61)27127226” x 6”8.00 (203)8.00 (203)14.50 (368)10.50 (267)16.00 (406)16.25 (413) 1 1.50 (38)140 (64)27127238” x 6”9.00 (229)9.00 (229)11.50 (292)11.50 (292)18.00 (457)18.00 (457) 1 1.50 (38)170 (77)27127248” x 8” 9.00 (229)9.00 (229)16.88 (429)11.75 (298)22.13 (562)22.13 (562)1 1/41.50 (38)245 (111)271272510” x 8”9.00 (229)11.00 (279)18.88 (480)11.75 (298)22.13 (562)22.13 (562)1 1/41.50 (38)264 (120)271272610” x 10”11.00 (279)11.00 (279)20.75 (527)14.00 (356)29.88 (759)29.88 (759)1 1/41.50 (38)461 (209)271272712” x 8”9.00 (229)12.00 (305)21.75 (552)11.75 (298)22.13 (562)22.13 (562)1 1/41.50 (38)316 (143)271272812” x 12”11.00 (279)12.00 (305)21.75 (552)14.00 (356)29.88 (759)29.88 (759)1 1/41.50 (38)460 (209)271272912” x 12”12.00 (305)12.00 (305)21.75 (552)15.00 (381)28.63 (727)28.63 (727)1 1/41.50 (38)490 (222)  Wilo USA LLC1290 N 25th AveMelrose Park, IL 60160Tel: 866-945-6872Fax: 708-338-9455Email: info@wilo-usa.comWeb: www.wilo-usa.comWilo Canada Inc.Bay 7-2915 10th Ave NECalgary, AB T2A 5L4Tel: 866-945-6236Fax: 403-277-9456Email: info@wilo-canada.comWeb: www.wilo-canada.com
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