Overview
The Grooved Outside Screw and Yoke (OS&Y) Gate Valve is a heavy-duty manual isolation valve for fire protection piping systems. Installed across automatic sprinkler risers, standpipe headers, and main water distribution circuits, it provides positive shut-off control to section off designated fire zones.
Technical Specifications
|
Specification |
Details |
|
Nominal Size |
DN50–DN300 (2"–12") |
|
Working Pressure |
Up to 300 PSI (20.7 bar / 2.07 MPa) |
|
Shell Test Pressure |
600 PSI (41.4 bar) for 60 seconds |
|
Groove Standard |
AWWA C606 / ISO 6182 |
|
Pipe Compatibility |
Schedule 10/40 ERW steel, seamless carbon steel & grooved fittings |
|
Operating Temperature |
-10°C to +80°C (14°F to 176°F) |
|
Body Material |
Ductile Iron ASTM A536 Grade 65-45-12 |
|
Wedge Material |
EPDM-encapsulated ductile iron core |
|
Stem Material |
AISI 420 (1Cr13) stainless steel |
|
Coating |
Fusion-Bonded Epoxy (FBE), ≥300 μm, internal & external |
|
Yoke Nut |
Cast Bronze ASTM B62 |
|
Handwheel |
Ductile iron, directional arrows, ≤250 N operating effort |
Design & Valve Construction
Visual Open/Close Status: External threaded stem provides immediate visual verification of valve position from a distance.
Protected Stem Threads: Outside screw and yoke design isolates operating threads from fluid medium, preventing rust and scale buildup.
Full-Bore Straight Waterway: Smooth internal passage prevents sediment collection and minimizes system pressure drop during high-flow operation.
Fusion-Bonded Epoxy Protection: Internal and external coating resists tuberculation and chemical corrosion in marine or wet environments.
OEM Supply & Project Support
Cast-in client logos, stainless steel nameplates, and private-label packaging tailored for regional distributors.
Complete 2D layout drawings, 3D Revit models, and engineering submittal sheets supplied before production.
EN 10204 3.1 chemical analysis and mechanical test reports dispatched with every shipment.
Production Inspection
AWWA C606 CNC Machining: Multi-axis CNC lathes machine grooved ends to exact tolerances for fast field alignment.
100% Hydrostatic Testing: Every valve undergoes a 2x working pressure shell test and seat tightness test before packing.
Cast Heat Number Tracking: Permanent markings on each valve body provide raw-material traceability from the foundry melt to the job site.
Coating Thickness Verification: Magnetic gauge testing verifies a minimum epoxy thickness of 300 µm with spark pinhole testing.
UL/FM Approval & Compliance
qualified
UL 262 & FM 1112 Listed: Fully tested and certified for fire protection service under strict UL/FM standards.
environment-friendly
NFPA System Alignment: Direct compliance with NFPA 13 sprinkler system and NFPA 14 standpipe design rules.
customized service
Potable Water Trim Option: Optional NSF/ANSI 61 and NSF/ANSI 372 lead-free trim available for dual-use water lines.
install
Factory Audits: Facilities undergo mandatory unannounced quarterly inspections by UL and FM field engineers.
FAQ
Q: When would I need the optional NSF/ANSI 61/372 lead-free trim?
A: The NSF/ANSI 61/372 trim is required when the fire protection line shares a connection point with a potable water supply, such as combined standpipe/domestic water risers in mid-rise residential buildings.
Q: What warranty period applies to this OS&Y gate valve?
A: This valve carries a 24-month manufacturer's warranty against material and manufacturing defects, separate from its designed 30-year service life under normal operating conditions.
Q: How does the EPDM wedge seal perform under long-term exposure to chlorinated fire water?
A: The EPDM encapsulation is tested for a minimum 20-year service life under continuous exposure to chlorinated municipal fire water at typical residual chlorine levels of 0.5-2.0 ppm, without measurable seal degradation.
Q: Is the ≤250N handwheel operating effort typical for this valve size?
A: The ≤250N operating effort is approximately 15-20% lower than typical OS&Y gate valves of the same size range, achieved through precision-machined stem threads that reduce operating friction.
Q: What is your typical lead time for a mixed order of valves and grooved fittings for a full riser package?
A: A mixed-container order combining gate valves and grooved fittings typically ships within 20-25 business days from drawing sign-off, depending on total valve quantity and size mix.
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