Description
This needle valve has been designed to control minute gas and liquid flows with precision and ease.
Design allows the rotation of the regulating screw to transform into linear motion of the needle without
subjecting the needle to gaps and/or vibrations produced by the screw,so smooth,stable flows can be ensured.
| Features |
- Capable of controlling ultra-minute flows
Very accurate,stable control of ultra-minute flows up to 1 ml/min possible
- Wide variations of needle type
15 types of needles are available for your choice of the type that best suits your needs.
- Needle of non-rotary structure
Because this valve is constructed so that the rotation of the regulating screw is transformed into linear motion of the needle,the valve has a longer life in addition to superior control performance.
- Superior temperature chacacteristics: 15-35°C
The valve counts on an outstanding temperature characteristic(flow fluctuations remain within an insignificant range of 0.3%/°C to ambient temperature variations) thanks to the temperature compensation system incorporated in the valve’s needle and orifice. This temperature compensation system is a utility model of KOFLOC registered at the United States Patent and Trademark Office.(Optional specification for needles #SS1 to #3B-BS)
This temperature compensation system is applicable to gases only,and not to liquids,because the viscosity of a liquid may fluctuate depending upon the temperature conditions.
- Capable of controlling ultra-minute flows
Can respond to a wide range of flows from ultra-minute flows of 0.5-3 ml/min to flows of 3-30 l/min.
- The incorporated precision needle valve allows a delicate control of flows.
The effective revolving speed of the needle valve can be maximized by specifying a maximum flow and normal supply pressure.
- Wide variations
Four total lengths of the flowmeter are available:126,156,206,and 256 mm,for your selection according to your needs.
- Two types of valve arrangement
The needle valve can be laid out either at the top or at the bottom of the meter.Choose the type that best suits your needs.
- Measurement and control of water flows also possible
Measurement and control of water flows not exceeding 1l/min are also possible.
|
| Applications |
- For accurate control of minute flows of gases and liquids
|
|
| Standard Specifications |
| Rated flow ranges |
See Table of Rated Flow Ranges below. |
| Rotating speed |
Approx. 12 turns |
| Max. operating pressure |
1.0MPa |
| Max. operating temperature |
(B) 70°C
(SS)120°C |
| Materials of parts exposed to fluids |
B:Brass,Duracon,NBR
SS:SUS316,Teflon,Viton |
| Fluids |
Gasses and liquids |
| Connection opening |
Rc1/4(Standard) |
Items marked with an asterisk(*)indicate common specifications. |
|
| Table of Rated Flow Ranges(Reference)Due to operating conditions and instrumental errors, there may be differences in the range of 80% to130% between the values indicated in this table and those that are actually used by the customer. |
Flow rate when the outlet valve is totally opened to release flows into air
| Needle # |
Supply pressure(MPa) (AIR at 20°C) |
Supply pressure(MPa)(Water at 20°C) |
| 0.05 |
0.1 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.05 |
0.1 |
0.15 |
| #SS1 |
0.023 |
0.047 |
0.078 |
0.11 |
0.15 |
0.19 |
0.22 |
– |
– |
– |
| #S1 |
0.08 |
0.11 |
0.2 |
0.27 |
0.34 |
0.4 |
0.47 |
– |
– |
– |
| #1 |
0.15 |
0.23 |
0.36 |
0.51 |
0.65 |
0.79 |
0.93 |
0.00145 |
0.0026 |
0.0036 |
| #2 |
0.34 |
0.46 |
0.71 |
1.0 |
1.2 |
1.5 |
1.75 |
0.0076 |
0.012 |
0.0153 |
| #2A |
0.45 |
0.65 |
1.0 |
1.3 |
1.65 |
2.0 |
2.3 |
0.0132 |
0.0195 |
0.0245 |
| #3 |
0.9 |
1.3 |
2.0 |
2.6 |
3.25 |
3.9 |
4.6 |
0.026 |
0.039 |
0.051 |
| #3A |
1.25 |
1.9 |
2.75 |
3.65 |
4.5 |
5.3 |
6.4 |
0.0365 |
0.0546 |
0.074 |
| #3B |
1.85 |
2.5 |
3.7 |
5.0 |
6.0 |
7.2 |
8.3 |
0.053 |
0.076 |
0.098 |
| #4 |
4.3 |
6.2 |
9.0 |
12.0 |
15.0 |
18.3 |
22.0 |
0.124 |
0.188 |
0.234 |
| #4A |
8.0 |
11.0 |
15.0 |
21.0 |
26.0 |
31.0 |
36.0 |
0.228 |
0.336 |
0.417 |
| #5 |
10.0 |
14.0 |
21.0 |
27.0 |
33.0 |
40.0 |
46.0 |
0.294 |
0.435 |
0.576 |
| #6 |
22.0 |
31.0 |
45.0 |
60.0 |
75.0 |
92.0 |
105 |
0.564 |
0.834 |
1.1 |
| #6A |
30.0 |
41.0 |
60.0 |
80.0 |
100 |
118 |
138 |
0.774 |
1.19 |
– |
| #6B |
38.0 |
53.0 |
82.0 |
160 |
135 |
160 |
185 |
1.28 |
1.95 |
– |
| #7 |
80.0 |
110 |
160 |
215 |
260 |
285 |
310 |
1.84 |
2.89 |
– |
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- Due to operating conditions and instrumental errors, there may be differences between the values indicated in the table above and those that are actually used by the customer.
- The values shown in the table above are data for Model 2412L for illustrative purposes only. As compared with the 2412L, flows on the 2412T will run less smooth when the flow rate increases. It is therefore recommended that the 2412L be used for flows of 5l/min or more.
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|
| CV Values |
| Needle # |
Max. CV value |
| #SS1 |
0.00012 |
| #S1 |
0.00028 |
| #1 |
0.00058 |
| #2 |
0.0012 |
| #2A |
0.0016 |
| #3 |
0.0033 |
| #3A |
0.0048 |
| #3B |
0.0063 |
| #4 |
0.016 |
| #4A |
0.028 |
| #5 |
0.035 |
| #6 |
0.078 |
| #6A |
0.10 |
| #6B |
0.13 |
| #7 |
0.28 |
|
