What is the difference between NRS and OS&Y gate valve?
NRS means Non-Rising Stem. OS&Y means Outside Stem and Yoke. In an NRS gate valve, the stem turns to open and close the gate, but the stem does not move up or down as it turns. In an OS&Y valve, as the stem turns, it moves into or out of the valve, which also moves the gate to open or seal the valve.
UL / FM OS&Y Resilient Seated Gate Valves (2”-24”)
UL / FM OS&Y Resilient Seated Gate Valves (2”-24”) are UL / FM Approved at the highest rated pressures in the industry.
Specifications
Complies with AWWA C515 Standard
Heavy duty handwheel and attachment nut
High quality graphite stem seal
NPT plug on body
Flanges to ANSI B16 1 Class125 (Other flange types available upon
request)
UL Listed for 2”-24”
FM Approved for 2”-16”
Working pressure:
300PSI for 2″-12 ″
250PSI for 14″-16″-18″200PSI for 20″-24″
Working temperature:
42° F – 180° F
Corrosion protection:
Fusion Bonded Epoxy Coated Interior and Exterior to AWWA C550 Standard
Installation:
Valves installed in horizontal piping systems should have the stems
oriented vertically
Valves installed in vertical piping systems should have the stems
oriented horizontally
UL Listed OS&Y Resilient Seated Gate Valves (14”-24”) Material Specifications:
| Part Name | Material | ASTM Spec. |
|---|---|---|
| Body | Ductile Iron | A536 65-45-12 |
| Wedge | Ductile Iron, EPDM Encapsulated | |
| Wedge Nut | Stainless Steel | AISI 304 |
| Stem | Stainless Steel | AISI 420 |
| Bonnett | Ductile Iron | A536 65-45-12 |
| Gasket | Rubber | EPDM |
| Packing | Graphite | Commercial |
| Gland | Ductile Iron | A536 65-45-12 |
| Yoke Nut | Bronze | B62 C83600 |
| Handwheel | Ductile Iron | A536 65-45-12 |
| Handwheel Nut | Ductile Iron | A536 65-45-12 |
| NPT | Malleable Iron | Commercial |
| Gland Bolt | Stainless Steel | AISI 316 |
| Bonnet Bolt | Carbon Steel | A307 B |
UL Listed FM Approved OS&Y Gate Valve(2”-12”) Material Specifications:
| TECHNICAL REQUIREMENT : ● Design and Manufacture Conform to AWWA C515 ● Flange to ANSI B16.1 Class 125.Other flange types available ● Fusion bonded epoxy coated inside and out ● Testing Conform to AWWA C515 ● UL/FM approval |
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Dimensions data (mm)
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