Watts Regulator Company 3P850 77SI Y-Type Strainer

Description:

The Watts 77SI 3/4" Wye Type Strainer is a pipeline strainer designed to remove dirt, rust, scale, pipe debris, and other foreign particles from liquid, steam, gas, and compressed air systems. Constructed with a durable cast iron body and a removable stainless steel screen, the strainer helps protect regulators, pumps, valves, traps, meters, and other downstream equipment from damage and premature wear. The Y-pattern design provides efficient filtration with minimal pressure drop while allowing easy maintenance through the threaded cleanout cap. The 77SI series is widely used in commercial and industrial piping systems requiring reliable debris filtration and equipment protection.

Applications:

The Watts 77SI 3/4" Wye Type Strainer is commonly used in water distribution systems, steam lines, compressed air systems, HVAC equipment, boiler installations, pump protection applications, pressure regulator stations, process piping systems, industrial manufacturing facilities, chemical processing plants, and commercial plumbing systems where removal of solid contaminants is required to protect downstream equipment and maintain efficient system operation.

Technical Specifications:

• Manufacturer: Watts Water Technologies
• Model: 77SI
• Product Type: Wye Type Strainer
• Connection Size: 3/4 Inch
• Connection Type: Female NPT
• Body Material: Cast Iron
• Screen Material: Stainless Steel
• Screen Size: 20 Mesh Standard
• Strainer Style: Y-Type
• Function: Debris and Particle Filtration
• Maximum Working Pressure: 250 PSI WOG
• Maximum Steam Pressure: 125 PSI
• Maximum Operating Temperature: 406°F (208°C)
• Cleanout Feature: Threaded Blow-Off Cap
• Installation Orientation: Horizontal or Vertical (Flow Down)
• Media Compatibility: Water, Steam, Air, Oil, Gas, and Process Fluids
• Application Type: Pipeline Equipment Protection
• Equipment Category: Industrial Pipeline Strainer

Common Replacements:

• Mueller Steam Specialty 751 Series Wye Strainer
• Eaton Model 85 Y Strainer
• Keckley Style A Cast Iron Y Strainer