1. Technical Specification Matrix 

2. Executive Product Overview 

Our OS&Y (Outside Screw and Yoke) Resilient Seated Gate Valve represents the pinnacle of reliability for critical infrastructure. Unlike non-rising stem valves, the Rising Stem design provides an immediate visual indicator of the valve’s position (Open/Closed), making it an essential safety component for fire protection and industrial process lines.

Engineered with a high-grade Ductile Iron (GGG50) body and a fully encapsulated EPDM wedge, this valve ensures a bubble-tight shut-off even under fluctuating pressure conditions. The blue Fusion Bonded Epoxy (FBE) coating provides superior resistance to internal and external corrosion, significantly extending service life in both above-ground and vaulted installations.

3. Key Performance Advantages 

• Instant Visual Monitoring: The OS&Y rising stem design allows operators to verify the valve status at a glance, preventing accidental operation in critical systems.

• Low Friction & High Torque Resistance: The precision-machined stem and yoke nut design minimize operating torque, allowing for smooth manual control even at high PN16 pressures.

• Zero-Leakage Sealing Technology: The wedge is fully vulcanized with high-quality EPDM, ensuring no debris accumulation and a 100% drip-tight seal.

• Superior Corrosion Barrier: Electrostatic epoxy powder coating protects the valve against harsh environmental factors and aggressive water chemistry.

• Maintenance-Friendly Design: The external screw design keeps the stem threads out of the fluid path, preventing thread corrosion and simplifying lubrication.

4. Global Application Context 

• Fire Suppression Systems: Ideal for fire pump houses where visual valve confirmation is required by safety codes.

• Water Treatment & Supply: Reliable isolation for municipal drinking water and wastewater filtration plants.

• HVAC & Cooling Towers: Durable performance in large-scale commercial climate control systems.

• Industrial Processing: Suitable for non-corrosive fluid handling in manufacturing and power generation.

5. Expert FAQ

Q: Why choose an OS&Y Rising Stem Valve over a Non-Rising Stem (NRS) valve?

A: The primary advantage of an OS&Y valve is that the stem moves up and down as the valve operates, providing a clear visual signal of whether the valve is open or closed. Additionally, the stem threads are located outside the body, protecting them from corrosive media.

Q: What is the benefit of the GGG50 Ductile Iron material?

A: GGG50 (Ductile Iron) offers significantly higher tensile strength and ductility than standard cast iron. This prevents the valve body from cracking under pressure surges or thermal expansion, making it safer for high-pressure PN16 applications.

Q: Can this valve be used for potable water?

A: Yes. Our resilient seated gate valves use non-toxic EPDM and WRAS-compliant epoxy coatings, making them perfectly safe for drinking water networks.