Kofloc Bellows Needle Valve 2450 Series

for rigid control of leaks

This bellows seal type kofloc needle valve has been specifically developed so that it can satisfy the requirements for such areas in which leak is a concern of vital importance. Model 2450 Bellows Needle Valve has a construction to drastically prevent fluid leaks. In addition, it is outstanding in heat resistance and corrosion resistance, so the customer can use it with peace of mind not only in such adverse conditions where high vacuum, high pressure, high temperature or extremely low temperature is present but also for corrosive, toxic or costly fluids.

Kofloc Bellows Needle Valve 2450 Series

Features 

- Stringent leak test (2 x 10-8 Pam3/sec)
  100% leak test is conducted before shipping, using a helium leak detector.
- Use of a precision needle
  The incorporated non-rotary type needle provides precise, smooth control of minute flows.
- Compatible with both gases and liquids
- Superior temperature characteristic
  Flows are scarcely affected by ambient temperature fluctuations, remaining within an insignificant range of flow variations.
 This superior temperature characteristic is applicable to gases only, and not to liquids, because the viscosity of a liquid may greatly vary depending upon the temperature conditions.

Applications

  • For vacuum systems
  • For semiconductor manufacturing lines
  • For production lines where toxic or corrosive gases are present

Specifications of Kofloc Bellows Needle Valve 2450 Series

  • Rated flow ranges : See the table below
  • Number of turns of regulating screw : Approx. 13–16 turns (Effective number of turns: 5–16)
  • Maximum operating pressure : 1 Mpa
  • Maximum operating temperature : 120℃
  • Fluids : Gas and liquid
  • Materials of parts in contact with fluids : SUS316, fluorocarbon resin, FKM
  • Connection end : 1/4 swagelok (for joint) * Optional: 1/8SW

 

Flow rate when the outlet valve is totally opened to release flows into air

Needle # Supply pressure (MPa)(Air at 20℃) Supply pressure (MPa)(Water at 20℃)
0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.05 0.1 0.15
BSS1 0.016 0.032 0.058 0.086 0.115 0.14 0.18
BS1 0.074 0.12 0.20 0.28 0.34 0.44 0.52
B1 0.10 0.16 0.24 0.34 0.42 0.53 0.60
B2 0.12 0.19 0.29 0.41 0.50 0.63 0.72 0.0010 0.0017 0.0024
B2A 0.25 0.39 0.60 0.82 1.05 1.30 1.50 0.010 0.015 0.018
B3 0.67 0.98 1.55 2.10 2.65 3.20 3.70 0.019 0.029 0.037
B3B 1.10 1.7 2.5 3.4 4.3 5.1 5.9 0.034 0.05 0.067
B4 4.4 6.3 9.4 12.0 16.0 19.2 22.0 0.15 0.21 0.27
B4A 6.7 9.8 13.9 19.0 24.0 27.9 31.6 0.23 0.32 0.40
B5 7.8 11.3 16.5 20.0 28.0 33.0 38.0 0.26 0.35 0.46
B6 15.3 20.5 32.0 44.0 55.0 68.0 80.0 0.46 0.66 0.79
B6A 21.0 32.0 51.0 70.0 90.0 110 128 0.72 1.0 1.15
B7 40.0 55.0 100 130 170 195 230 1.18 1.7 1.95
(L/MIN)
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