Watts Series 77F-DI-125 & 77F-DI-FDA-125 Flanged, Wye Pattern, Cast Iron Strainers
Sizes: 2" – 12"
Product Overview
The Watts Series 77F-DI-125 and 77F-DI-FDA-125 are flanged, wye pattern, cast iron strainers designed for water and steam service (77F-DI-125) or FDA approved sanitary water applications (77F-DI-FDA-125). These strainers feature 304 stainless steel perforated screens, a cast iron flanged retainer cap with a gasket tapped for a closure plug, and a drain/blowoff connection with a closure plug.
The 77F-DI-FDA-125 model is further enhanced with a double-coated, heat-fused epoxy coating on both the interior and exterior surfaces, meeting FDA requirements for sanitary applications.
Key Features
- Flanges conform to American National Standards Institute, Class 125 (ANSI B16.1) and WW-S-2739 Type 2.
- Lead Free* cast iron body. (*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.)
- Durable 304 stainless steel perforated screens.
- Cast iron flanged retainer cap with gasket tapped for closure plug.
- Includes a drain/blowoff connection with a closure plug.
- Series 77F-DI-FDA-125 features heat-fused FDA approved epoxy coating (interior and exterior).
Models
- 77F-DI-125: Available in sizes 2" – 12" with flanged connections, suitable for water and steam service.
- 77F-DI-FDA-125: Available in sizes 2" – 12" with flanged connections and a double-coated, heat-fused FDA approved epoxy coating (interior and exterior), specifically for water service only.
Specifications
Pressure – Temperature Ratings
Maximum Operating Pressure:
- 200 psi (13.8 bar) WOG, non-shock, @ 210°F (99°C)
- 125 psi (8.6 bar) WSP @ 353°F (178°C)
Optional Epoxy Coating (77F-DI-FDA-125): 140°F (60°C) Maximum
Standard Screens
- Sizes 2" – 5": 1/16" perforation
- Sizes 6" – 8": 1/8" perforation
- Sizes 10" – 12": 3/16" perforation
Screen Options
- Wire Mesh Liners: Available in 304 stainless steel grades (#20, #40, #60, #80, #100).
- Perforated Screens: Available in 304 stainless steel with perforation sizes (3/64", 1/16", 1/8", 3/16").
Specifications (77F-DI-125)
A flanged, wye pattern, cast iron strainer to be installed as indicated on plans. The strainer must have flanges conforming to American National Standards Institute, Class 125. It features 304 stainless steel perforated screens and a drain/blowoff connection furnished with a closure plug. Pressure rating must be no less than 200 psi (13.8 bar) WOG non-shock and 125 psi (8.6 bar) WSP. The strainer shall be a Watts Series 77F-DI-125.
Specifications (77F-DI-FDA-125)
A flanged, wye pattern, cast iron strainer with a double-coated, heat-fused, FDA approved epoxy coating on the interior and exterior surfaces for FDA sanitary applications. Flanges must conform to ANSI B16.1 Class 125. It includes 304 stainless steel perforated screens and a drain/blowoff connection furnished with a closure plug. Pressure rating is 200 psi (13.8 bar) WOG. The strainer shall be a Watts Series 77F-DI-FDA-125.
Materials and Standards
Materials
The strainer components are constructed from the following materials:
- Screen (A): AISI 304SS
- Cover Gasket (B): Graphite
- Plug (C): ASTM A47
- Washer (D): ASTM A6
- Cotter Pin (E): ASTM A112
- Plate (F): ASTM A6
- Bolt Nut (G): ASTM A6
- Bolt (H): ASTM A6
- Set Screw (I): ASTM B16
- Cover Bolt Nut (J): ASTM A6
- Cover Bolt (K): ASTM A6
- Cover (L): ASTM A-126 Class B
- Body (M): ASTM A-126 Class B
Note: For the 77F-DI-FDA-125 model, component parts are epoxy coated internally and externally.
Diagram: Strainer Components
The strainer assembly consists of the following labeled parts: A. Screen, B. Cover Gasket, C. Plug, D. Washer, E. Cotter Pin, F. Plate, G. Bolt Nut, H. Bolt, I. Set Screw, J. Cover Bolt Nut, K. Cover Bolt, L. Cover, M. Body.
Standards
Tested and Certified by NSF International. Certified to NSF/ANSI 372.
Dimensions and Weights
| Size | Dimensions (in.) | Dimensions (mm) | Screen Area (sq.in.) | Weight (lbs./kgs.) | |||||
|---|---|---|---|---|---|---|---|---|---|
| A | B | C (NPT) | A | B | C | lbs. | kgs. | ||
| 2" | 7 7/8 | 5 1/4 | 1/2 | 200 | 133 | 13 | 7 | 36 | 18 |
| 2 1/2" | 10 | 6 1/2 | 1 | 254 | 165 | 25 | 9 3/4 | 56 | 28 |
| 3" | 10 1/8 | 7 | 1 | 257 | 178 | 25 | 10 | 75 | 34 |
| 4" | 12 1/8 | 8 1/4 | 1 1/2 | 308 | 210 | 38 | 12 | 121 | 60 |
| 5" | 15 5/8 | 11 1/4 | 2 | 397 | 286 | 51 | 17 | 210 | 95 |
| 6" | 18 1/2 | 13 1/2 | 2 | 470 | 343 | 51 | 20 | 278 | 133 |
| 8" | 21 5/8 | 15 1/2 | 2 | 551 | 394 | 51 | 22 3/4 | 387 | 247 |
| 10" | 26 | 18 1/2 | 2 | 660 | 470 | 51 | 28 | 577 | 370 |
| 12" | 29 7/8 | 21 3/4 | 2 | 759 | 552 | 51 | 30 | 795 | 579 |
* D dimension is minimum clearance for screen removal.
Flow/Pressure Drop Chart
The Flow/Pressure Drop Chart illustrates the relationship between liquid flow rate (measured in gallons per minute, gpm) and pressure drop (measured in pounds per square inch, psi). The chart features multiple lines, each representing a different strainer size from 2 inches to 12 inches, allowing users to estimate pressure loss at various flow rates for specific strainer sizes.
The vertical axis represents Liquid Flow (Water) in gpm, ranging from 10 to 10,000. The horizontal axis represents Pressure Drop in psi, ranging from 0.1 to 20.
Notice
The information provided in this document is intended as a reference and is not a substitute for complete product installation and safety information or the expertise of a trained installer. Users are required to thoroughly read all installation instructions and product safety information before commencing installation.
