Swagelok SS-18RS8 18 Series Integral-Bonnet Needle Valve, 1/2 in.

Dial in precise flow control with the SS-18RS8 integral-bonnet needle valve. The 18 Series forges the bonnet as part of the body, so you eliminate a leak path and gain a rugged valve that shrugs off vibration and hard service. You get a 316 stainless steel build, a regulating stem for fine throttling, and a live-loaded packing system that holds its seal as temperatures swing. This valve rates to a strong 5000 psig at room temperature and keeps working all the way to 600°F, where it still holds 3130 psig. That wide window makes it a workhorse on steam, heat-transfer loops, and high-temperature instrument lines. A 1.80 Cv path through the 0.375 in. orifice lets you meter and shut off in one compact package with 1/2 in. Swagelok tube-fitting ends. Trust it to throttle sample flow, isolate gauges, and control bleed lines day after day. Need a soft-seat stem tip, alternate orifice, or NPT ends? Collins-Oliver configures the 18 Series build for your application. Call for a quote.

Key Features

• Integral forged bonnet eliminates a body-to-bonnet leak path
• Regulating stem for fine, repeatable flow control
• 1.80 Cv through a 0.375 in. orifice
• 5000 psig at 100°F; holds 3130 psig at 600°F
• -65 to 600°F temperature range in 316 stainless steel
• Live-loaded packing system with 1/2 in. Swagelok tube fitting ends

Technical Specifications

• Series: 18 Series (integral-bonnet needle valve)
• Body Material: 316 Stainless Steel
• Cv: 1.80
• Orifice: 0.375 in.
• End Connections: 1/2 in. Swagelok tube fitting (both ends)
• Working Pressure: 5000 psig at 100°F; 3130 psig at 600°F
• Temperature Range: -65 to 600°F (-53 to 315°C)
• Stem Type: Regulating
• Packing: Live-loaded packing system
• Pricing: Call for quote