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The Valve Inc. 51 Series of Needle Valves are designed for precise flow of
gases or liquids with pressures up to 3000 psi. These precision metering valves
are for applications requiring metering of larger flows than those controlled by
our standard 52 Series (Brass) and 54 Series (Stainless Steel).
Two models, 51-8-31E and 51-12-41E utilize a bar stock brass
body. All other models use a cast bronze body. The following specifications
apply to all of the above models. Every valve is factory tested to be leak-tight
at 1100 psi.
Maximum Operating Pressure: 3000 psi (344.5 bar)
Operating
Temperature Range: -65? to 450? F (-54? to 233? C)
? Packing seal is Teflon
? Needle is stainless
steel
? Metal to metal seat
? 1.75" phenolic plastic knob
? Body,
bonnet, and seat are bronze
? 22-24 turns from shutoff to full open
? 32
threads/inch for precision metering
Dimensions
Cv vs. No. Turns
Flow Characteristics of Models
| |
|
Cv (gpm)
|
|
|
No. Turns Open
|
51-4
|
51-6
|
51-8
|
|
1
|
0.02
|
0.07
|
0.13
|
|
2
|
0.05
|
0.14
|
0.33
|
|
3
|
0.09
|
0.22
|
0.48
|
|
4
|
0.12
|
0.30
|
0.62
|
|
5
|
0.16
|
0.35
|
0.73
|
|
6
|
0.19
|
0.41
|
0.82
|
|
7
|
0.21
|
0.48
|
0.91
|
|
8
|
0.23
|
0.52
|
1.01
|
|
9
|
0.27
|
0.57
|
10.6
|
|
10
|
0.30
|
0.61
|
1.09
|
|
Full Open
|
0.38
|
0.67
|
1.18
|
Selction Guide
|
Item
#
|
Orifice
|
Port
|
Cv
|
Max. A
|
B
|
Type
|
Mounting
Holes
|
|
51-4-21
|
0.125
|
1/4"
|
0.375
|
5.84
|
0.79
|
Straight Pattern
|
N/A
|
|
51-6-21
|
0.1875
|
1/4"
|
0.67
|
5.84
|
0.79
|
Straight Pattern
|
N/A
|
|
51-6-23
|
0.1875
|
1/4"
|
0.67
|
5.84
|
0.97
|
Mounting Flange
Straight
Pattern
|
10-32
|
|
51-6-24
|
0.1875
|
1/4"
|
0.67
|
5.84
|
0.79
|
Straight Pattern
|
N/A
|
|
51-8-31E
|
0.25
|
3/8"
|
0.90
|
6.00
|
0.97
|
Straight Pattern
|
N/A
|
|
51-8-32
|
0.25
|
3/8"
|
1.08
|
6.25
|
1.14
|
Angle Pattern
|
N/A
|
|
51-8-33
|
0.25
|
3/8"
|
1.08
|
6.00
|
0.93
|
Mounting Flange
Straight
Pattern
|
10-32
|
|
51-12-41E
|
0.375
|
1/2"
|
2.65
|
7.00
|
1.1
|
Straight Pattern
|
N/A
|
|
51-14-61E
|
.4375
|
3/4"
|
3.10
|
7.25
|
1.1
|
Straight Pattern
|
N/A
|
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