The Watts 408-OSY-RW 8 is a 8" gate valve with a rising OS&Y stem, a resilient wedge and Flanged connections. It is UL Listed and FM Approved for fire protection service. It features a cast iron body and a buna-n seat. Rated to 250 psi and up to 140°F.
This OSY flanged gate valve, Watts 8" model 408-OSY-RW, is used in fire protection applications in fire main shutoff applications. It features an epoxy coated cast iron body with flanged connections, resilient wedge disc, and cast iron handwheel. It is UL/FM listed and complies with MSS-SP-70. The maximum pressure is 250 psi (17 bar) CWP.
Features
- Epoxy coated cast iron body
- Flanged connections
- Resilient wedge disc
- Cast iron hand wheel
Common Questions
- Is this UL/FM listed for fire service?
- Yes. The 408-OSY-RW 8 is UL Listed and FM Approved and complies with MSS SP-70, so it can be used as a fire main shutoff. Its OS&Y stem gives visual position indication and accepts a supervisory tamper switch.
- Rising or non-rising stem?
- OS&Y (outside stem and yoke) — the stem rises as the valve opens, giving visual position indication and room for a supervisory switch. It needs headroom above the valve.
- Is this a complete valve or just the replacement gate?
- Complete valve. The 408-OSY-RW 8 ships as a full assembly — body, bonnet, wedge, stem and handwheel. The Watts NRS-RW-GATE / OSY-RW-GATE items are gate assemblies only, sold to service an existing valve.
- What does "resilient wedge" mean?
- The wedge is a ductile-iron disc fully encapsulated in rubber, so it seals bubble-tight against the epoxy-coated body without a bronze seat ring and holds up against high differential pressure.
Specifications
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Type: Gate
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Size: 8"
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Inlet Size: 8"
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Outlet Size: 8"
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Connection: Flanged
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Body Material: Cast Iron
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Seat / Seal Material: Buna-N
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Max Pressure (psi): 250
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Application: Fire Protection
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Shutoff: OS&Y Gate
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: 408-OSY-RW 8
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Temperature: up to 140°F
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Certifications: UL Listed, FM Approved
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Lead-Free: No
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Valve Style: Gate
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Stem Type: OS&Y Rising
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Wedge / Disc Type: Resilient
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UL/FM Listed: Yes
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Pressure Rating: 250 psi CWP
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Operator / Handle: Handwheel
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Bonnet Style: Bolted
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Replacement Part: No
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Standards: MSS SP-70;ANSI B16.1
