Zurn 3-48OSY Osy Gate Valve Flanged 3 Inches

Product Description

The ZURN 3-48OSY is an outside screw and yoke (OSY) gate valve with flanged end connections, designed for use in commercial and industrial piping systems. OSY gate valves provide a clear visual indicator of valve position — the stem rises when open and retracts when closed — making them a preferred choice in fire protection, mechanical, and process piping installations where valve status must be confirmed at a glance. The flanged end connections on this 3-inch valve allow for bolted installation into flanged piping runs, providing a secure, leak-resistant joint suitable for high-traffic service environments. Licensed pipefitters and mechanical contractors are the primary installers of this valve type.

This valve is suited for wet-pipe and dry-pipe fire suppression systems, commercial HVAC hydronic loops, and general industrial fluid handling where a full-bore, bidirectional shutoff is required. The 3-inch body size accommodates moderate to high flow rates in main distribution lines. Its OSY design is specifically favored in fire protection applications because tamper switches can be mounted to the rising stem to send open or closed status signals to a fire alarm control panel.

Key Features

• Outside screw and yoke (OSY) design provides visible stem position indicator for at-a-glance open or closed status
• Flanged end connections on both sides allow bolted installation into flanged piping assemblies
• 3-inch nominal pipe size fits standard main distribution runs in fire protection and mechanical systems
• Full-bore gate design minimizes flow restriction when valve is fully open
• Rising stem is compatible with tamper switch accessories used in fire alarm monitoring applications

Compatibility

Designed as an OEM-style replacement or new-installation gate valve for 3-inch flanged piping systems in fire protection, commercial HVAC, and industrial fluid handling applications.

Installation Notes

Installation of flanged gate valves should be performed by a licensed pipefitter or mechanical contractor in accordance with applicable codes, including NFPA 13 for fire suppression systems and the International Plumbing Code for domestic and commercial piping. Shut down system pressure and drain the affected piping segment before removing or installing the valve. Verify flange bolt patterns and gasket type before assembly, and torque flange fasteners evenly in a cross pattern following the gasket manufacturer's guidelines. If a tamper switch is being installed on the OSY stem, coordinate with the fire alarm system installer to ensure proper supervision circuit integration.

Technical Specifications

• Nominal Pipe Size: 3 inches
• Valve Type: OSY Gate Valve
• End Connections: Flanged x Flanged
• UPC: 612052055121

Standard Information

• Brand: ZURN
• Manufacturer Part Number: 3-48OSY