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Home > Products > Valves > Bellows-Sealed > Metering Bellows Valves Manual
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Metering Bellows Valves Manual

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Metering Bellows-Sealed Valves—BM Series

BM Series Valves

Swagelok® bellows-sealed metering valves feature micrometer handles for precise, repeatable flow settings.


Specifications

Working Pressure
Temperature
Flow Coefficient
Body Material
Stem Tip Material
End Connections
• Type


• Size
Internal Volume

 

Up to 700 psig (48.2 bar)
–20 to 900°F (–28 to 482°C)
0.005 to 0.30
316 stainless steel
Hard chrome-plated 316 stainless steel

Swagelok tube fitting, tube socket weld, tube butt weld, integral male VCR® face seal fitting
1/4 and 3/8 in.; 6 mm
0.07 in.3 (1.1 cm.3)—metering stem tip
0.11 in.3 (1.6 cm3)—regulating stem tip

Features

BM Series Cutaway View
  • Micrometer handles measure stem position in 0.001 in. (0.025 mm) increments.
  • Valves open to maximum flow in six turns.
  • Slotted handle tops enable adjustments with a screwdriver.
  • Panel and bottom mounting are standard.
  • Handle dead stop protects needle tip from damage by overtightening
  • Actuator threads are protected from system contaminants
  • Actuator backstop enhances bellows life
  • Lock screw locks in flow settings
  • Precision-formed metal bellows provides reliable service
  • Metering and regulating stem tips available

Testing

Every BM series metering bellows valve is helium leak tested to a maximum leak rate of 4 × 10–9 std cm3/s at the envelope and body seal.


Cleaning and Packaging

  • Swagelok BM series metering 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 BM series metering 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.


Factory Flow Settings

  • BMG and BMW Series
    • With 10 psig (0.68 bar) inlet pressure and the flow rate from 10 to 15 cm3/min, the handle is set at 0. BMG and BMW series valves are not intended for shutoff service
  • BMRG and BMRW Series
    • Following a helium leak test and the valve seat to a maximum leak rate of 7 × 10–7 std cm3/s, the handle is set at 0. BMRW series valves are not recommended for shutoff above 600°F (315°C).

Options

  • Welded female VCR face seal fittings
  • Special alloys
  • Maintenance kits
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