Built for Waterworks, Fire Protection, and Visible Valve Control

OS&Y Gate Valve(Hants Model HGO-FF / HGO-300FF) is a rising stem gate valve designed for dependable shut-off control in municipal waterworks, potable water distribution, and fire protection piping systems. The OS&Y structure allows operators and inspectors to visually confirm the valve position from outside the pipeline, making it suitable for critical systems where clear valve status verification is required.

This model series is available in multiple certified options for different applications: a UL listed model for fire protection systems, an NSF-certified model for drinking water applications under NSF/ANSI/CAN 61 and NSF/ANSI 372, and a dual UL + NSF certified and AWWA-compliant model for multi-purpose municipal and commercial piping systems.

Application of OS&Y Gate Valve

• Engineered to withstand heavy-duty operation within water treatment infrastructure. These valves are ideal for process piping, sand filter backwash systems, and isolation lines, ensuring compliance with strict drinking water standards.
• Designed for municipal booster stations, intake structures, and clearwell reservoirs. The heavy-duty design handles high-velocity flows, while the lead-free composition prevents secondary contamination during water storage and distribution.
• Perfect for post-treatment lines where desalinated water is conditioned into potable water, as well as high-standard recycled water networks. The materials offer excellent reliability and non-toxic performance for clean water transport.
• Tailored for industrial manufacturing plants, including food processing, microelectronics, and pharmaceuticals. It efficiently manages high-purity process water networks and dual-purpose industrial water loops.
• Provides an ultra-reliable solution for emergency backup supply and bypass piping in critical facilities like hospitals and data centers, where meeting both fire safety codes and municipal plumbing regulations is mandatory.
• Serves as a critical control and shut-off valve for automatic fire sprinkler systems, main risers, and fire pump connections. The UL-listed design guarantees immediate, dependable operation in critical fire suppression emergencies.

Key Features and Benefits of OS&Y Gate Valve

• Fully compliant with both UL listing for fire protection and NSF/ANSI certification for potable water. This dual-purpose design simplifies inventory management, lowers procurement costs, and ensures full compliance with health and safety regulations.
• Manufactured and tested in strict accordance with AWWA standards, guaranteeing robust structural integrity, precise wall thickness, and heavy-duty mechanical endurance required for municipal and industrial waterworks.
• The Outside Screw and Yoke (OS&Y) architecture places the stem threads entirely outside the valve body. This protects critical moving parts from constant exposure to fluid, preventing corrosion from water, mineral buildup, and premature wear.
• The rising stem design provides immediate, foolproof visual confirmation of the valve’s position from a distance. Safety inspectors and facility operators can instantly verify whether the system is fully operational or isolated.
• Constructed with certified premium materials that meet strict lead-free standards. This guarantees that no toxic substances or heavy metals leach into the water column, ensuring 100% safe drinking water transmission.
• The straight-through wedge design allows for an unobstructed full-port fluid path when fully open. This significantly minimizes pressure drop, reduces turbulence, and maximizes flow efficiency across high-capacity piping networks.

Frequently Asked Questions(FAQ) about OS&Y Gate Valve

Q1: Can this valve be used simultaneously for both fire protection and drinking water systems?

Yes, absolutely. Thanks to its dual certification with UL Listed for fire safety and NSF/ANSI Approved for potable water, it is the perfect solution for modern combined water systems. It allows a single pipeline grid to handle both needs, significantly reducing product procurement costs and installation space while meeting all strict regulatory codes.

Q2: Why are OS&Y gate valves commonly made from ductile iron?

OS&Y gate valves are commonly made from ductile iron because of its higher tensile strength and impact resistance compared to gray cast iron.

Q3: What are the main design advantages of an AWWA-compliant OS&Y gate valve?

The OS&Y (Outside Screw and Yoke) design keeps the stem threads outside the valve body, completely protecting them from internal fluid corrosion or mineral buildup. Additionally, the rising stem gives operators immediate visual confirmation of the valve’s open or closed status from a distance, which is critical for safety inspections. Compliance with AWWA standards further guarantees the heavy-duty structural wall thickness and long-term mechanical durability required for municipal waterworks.

Q4: Where are 300 PSI OS&Y valves typically used? Are 300 PSI OS&Y valves required for UL/FM fire protection systems?

300 PSI OS&Y valves are typically used in fire protection system with high pressure conditions and are commonly required for UL/FM fire protection systems.

Q5: Are OS&Y gate valves easier to inspect than NRS gate valves?

Yes, OS & Y gate valves are easier to inspect than NRS gate valves as they have visible rising stems which show the valve position clearly.

Q6: Do OS&Y gate valves require regular lubrication?

In most cases, OS&Y gate valves do not require regular lubrication as many components are manufactured or coated to reduce friction without the need for periodic lubrication.

NSF Certified for Drinking Water System Components: Lead Content (NSF/ANSI 372) , Health Effects (NSF/ANSI/CAN 61)

 

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