Top Page > Product Information > Flow Control Valves > Bellows Needle Valve (for rigid control of leaks)MODEL 2450 SERIES
Flow Control Valves
- Bellows Needle Valve (for rigid control of leaks)
MODEL 2450 SERIES - The low-leak bellows needle valve products
The KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES is a needle valve with bellows seal with very low leakage, designed to meet high-performance demand under extreme conditions, with focus on tightest leak control, precision and reliability under harsh conditions.
KOFLOC MODEL 2450 SERIES Low-Leak Bellows Needle Valve
Quick Review
Extensive Leak Testing
The KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES is put to the most extensive battery of leak tests to minimize possible leaks (2x10-8 Pam3/sec He) even under harsh conditions.
Reliability
The performance of KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES is very stable and the flow rate variance of gases due to ambient temperature change is very small.
KOFLOC Dependability
KOFLOC has 60 years of experience in manufacturing precision flow instruments. KOFLOC products, both standard and off-catalog custom items are well received throughout Japan as the name that manifests confidence. KOFLOC, the fluid expert, is the name professionals trust in precision control of minute flow.
Non-Rotating Needle
Constructed using high precision parts, the design of the KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES transforms the rotation of the regulating screw to into linear motion of the needle without subjecting it to gaps and vibrations produced by the screw, to ensure stable and even control of minute flow.
Versatility
The KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES can be used with for both corrosive and toxic mediums at high and very low temperatures, or even with vacuum system, making it ideal for applications using expensive mediums.
EXAMPLE
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Extensive Leak Testing
The KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES is put to the most extensive battery of leak tests to minimize possible leaks (2x10-8 Pam3/sec He) even under harsh conditions.
Reliability
The performance of KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES is very stable and the flow rate variance of gases due to ambient temperature change is very small.
KOFLOC Dependability
KOFLOC has 60 years of experience in manufacturing precision flow instruments. KOFLOC products, both standard and off-catalog custom items are well received throughout Japan as the name that manifests confidence. KOFLOC, the fluid expert, is the name professionals trust in precision control of minute flow.
Non-Rotating Needle
Constructed using high precision parts, the design of the KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES transforms the rotation of the regulating screw to into linear motion of the needle without subjecting it to gaps and vibrations produced by the screw, to ensure stable and even control of minute flow.
Versatility
The KOFLOC Low-Leak Bellows Needle Valve MODEL 2450 SERIES can be used with for both corrosive and toxic mediums at high and very low temperatures, or even with vacuum system, making it ideal for applications using expensive mediums.
EXAMPLE
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Features
Applications
♦ Vacuum systems
♦ Semiconductor manufacturing
♦ Toxic or corrosive gas control
♦ Semiconductor manufacturing
♦ Toxic or corrosive gas control
Standard Specifications
| Rated flow ranges | See Table of Rated Flow Ranges below. |
|---|---|
| Regulating screw rotating speed | Approx. 13-16 turns |
| Max. operating pressure | 1MPa |
| Upper limit of working temperature | 120°C |
| Fluids | Gases and liquids |
| Materials of parts exposed to fluids | SUS316,Teflon,Viton(joint) |
| Connection end | 1/4 swage-lock(for joint)*Optional:1/8SW |
Optional Specifications
Flow rate when the outlet valve is totally opened to release flows into air, 1
| Nee dle # | Supply pressure(MPa)(Air at 20°C) | ||||||
|---|---|---|---|---|---|---|---|
| 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | |
| BSS1 | 0.016 | 0.032 | 0.058 | 0.086 | 0.015 | 0.140 | 0.180 |
| 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 |
| B2A | 0.25 | 0.39 | 0.60 | 0.82 | 1.05 | 1.30 | 1.50 |
| B3 | 0.67 | 0.98 | 1.55 | 2.10 | 2.65 | 3.20 | 3.70 |
| B3B | 1.10 | 1.7 | 2.5 | 3.4 | 4.3 | 5.1 | 5.9 |
| B4 | 4.4 | 6.3 | 9.4 | 12.0 | 16.0 | 19.2 | 22.0 |
| B4A | 6.7 | 9.8 | 13.9 | 19.0 | 24.0 | 27.9 | 31.6 |
| B5 | 7.8 | 11.3 | 16.5 | 20.0 | 28.0 | 33.0 | 38.0 |
| B6 | 15.3 | 20.5 | 32.0 | 44.0 | 55.0 | 68.0 | 80.0 |
| B6A | 21.0 | 32.0 | 51.0 | 70.0 | 90.0 | 110 | 128 |
| B7 | 40.0 | 55.0 | 100 | 130 | 170 | 195 | 230 |
Table of Rated Flow Ranges(Reference)Due to operating conditions and instrumental errors, there may be differences in the range of 80% to 130% between the values indicated in this table and those that are actually used by the customer.
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Flow rate when the outlet valve is totally opened to release flows into air, 2
| Needle# | Supply pressure(MPa)(Water at 20°C) | ||
|---|---|---|---|
| BSS1 | 0.05 | 0.1 | 0.15 |
| BS1 | - | - | - |
| B1 | - | - | - |
| B2 | - | - | - |
| B2A | 0.0010 | 0.0017 | 0.0024 |
| B3 | 0.019 | 0.029 | 0.037 |
| B3B | 0.034 | 0.05 | 0.067 |
| B4 | 0.15 | 0.21 | 0.27 |
| B4A | 0.23 | 0.32 | 0.40 |
| B5 | 0.26 | 0.35 | 0.46 |
| B6 | 0.46 | 0.66 | 0.79 |
| B6A | 0.72 | 1.0 | 1.15 |
| B7 | 1.18 | 1.7 | 1.95 |
Table of Rated Flow Ranges(Reference)Due to operating conditions and instrumental errors, there may be differences in the range of 80% to 130% between the values indicated in this table and those that are actually used by the customer.
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CV Values
| Needle # | Max. CV value |
|---|---|
| BSS1 | 0.00008 |
| BS1 | 0.0003 |
| B1 | 0.0004 |
| B2 | 0.0005 |
| B2A | 0.00098 |
| B3 | 0.0025 |
| B3B | 0.0043 |
| B4 | 0.016 |
| B4A | 0.025 |
| B5 | 0.028 |
| B6 | 0.051 |
| B6A | 0.08 |
| B7 | 0.14 |
Notes:
♦We can suggest you the needle number most suitable for your equipment if the pressure, fluid, flow rate and other operating conditions of your equipment are known. Please use the above table for reference only.
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