Specifications Working Pressure Temperature Flow Coefficient Body Material Stem Tip Material End Connections •  Type •  Size Internal Volume

Up to 2500 psig (172 bar) –20 to 1200°F (–28 to 648°C) 0.36 to 5.3 316 stainless steel 316 stainless steel, PCTFE, cobalt-based alloy Swagelok tube fitting, female VCR® face seal fitting, tube socket weld, tube butt weld 1/4 to 3/4 in.; 6 to 12 mm 0.11 to 1.46 in.3 (1.8 to 23.9 cm3)

• Gasketed or welded body-to-bellows seals 
• Stem tips for shutoff or regulating service 

Regulating	Conical	Nonrotating spherical

• Panel, bottom, and side mounting available
• Bar handle and pneumatic actuation available.
• Upper packing provides secondary containment as backup to primary seal.
• Acme power transmission threads enable low operating torque.
• 4U, 6U, and 8U series contain conventional bellows (system pressure acts on inside of bellows); 12U and 12UA series contain inverted bellows (system pressure acts on outside of bellows).
• Straight- and angle-pattern valves

Testing 
Every U series bellows valve is factory vacuum tested with helium at room temperature for 5 s to a maximum leak rate of 4 × 10^–9 std cm³/s at the seat, envelope, and all seals.

Cleaning and Packaging

• Swagelok U series bellows valves with VCR end connections are processed in accordance with Swagelok Special Cleaning and Packaging (SC-11) to ensure compliance with product cleanliness requirements stated in ASTM G93 Level C.
• Swagelok U series bellows valves with other end connections are processed in accordance with Swagelok Standard Cleaning and Packaging (SC-10); special cleaning and packaging are available as an option.

Valve Options

• High-Temperature Model 
  • Nickel-based lubricant prevents seizing of actuator threads. 
  • Valve rating extends to: 
  • 1000°F (537°C) for valves with VCR fittings. 
  • 1200°F (648°C) for valves with Swagelok tube fittings.
•  Low-Temperature Model 
• PTFE secondary packing for temperatures
• from –325 to 400°F (–200 to 204°C).
• Alloy 600 bellows

Pneumatic Actuators

• Normally closed, normally open, and double acting actuation modes
• Reliable piston design for enhanced cycle life 
• Low actuation pressures 
• Aluminum and stainless steel components 

Pneumatic Actuator Options and Accessories

• Pneumatic Actuator Microswitches 
• Signal OPEN or CLOSED position of valve to panel or process controller
• Factory assembled on 4U, 6U, and 8U series valves
• Microswitch kits for field assembly.

Maintenance Kits
Stem tip/adapter kits, bellows kits, and gasket kits are available for UG, URG, and UK series valves. Download the Swagelok Bellows-Sealed Valve Maintenance Kits catalog.