Page 1
L
[44.45 OPEN]
[41.67]
Ø63/64
]
Ø63/64
Flow Coefficient at Turns Open
Cv USGPM @ 1 psi
Turns Open
MODEL NVII
NEEDLE VALVES
Economical, Pressures Up to 2000 psi, Blowout-Proof Stem
[Ø25.00]
[Ø25.00]
1-3/4 OPEN
1-41/64 CLOSED
[41.67 CLOSED]
Ø23/32
[Ø18.26]
NVII-1B
The Model NVII Needle Valves provide easy ow regulation in all applications,
including shut off and throttling for pressure gages and instruments. With a one
piece, hot forged brass body construction, years of maintenance-free service can
be expected. The Model NVII, with its tamper-proof design and blowout-proof stem,
provides excellent performance and reliability.
BENEFITS/FEATURES
• Pressures to 2000 psi
• One piece body construction
• Tamper proof design and blowout-proof stem
APPLICATIONS
• Instrument line shut off, instrument isolation, drain valve, and pressure gages
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Turns
1/2
1
1-1/2 2
NVII-2B NVII-1B NVII-2B
NVII
2-1/2
3
Others
1-41/64 CLOSED
[41.67 CLOSED]
1-23/32
[43.66]
1/4-18 NPT
1/4 - 18 NPT
33/64 TYP
1-41/64
SPECIFICATIONS
Service: Gases and liquids compatible with wetted materials. Not rated for steam
use.
End Connection Size: 1/4˝ NPT.
Pressure Limit: 2000 psi (138 bar) (CWP).
Wetted Materials: Valve body: Brass (CW617N); Retainer, handwheel: Brass
(CW614N); O-ring: Fluoroelastomer.
Temperature Limits: -40 to 350°F (-40 to 176.7°C). (Warning: freezing of the uid
in the installation may severely damage the valve.)
Flow Coefcient: 0.31.
Weight: 0.22 lb.
MODEL CHART
Model Description
NVII-1B
NVII-2B
USA: California Proposition 65
WARNING: This product can expose you to chemicals including Lead, which is known to the State
of California to cause cancer and birth defects or other reproductive harm. For more information go
to www.P65Warnings.ca.gov.
[13.10 TYP]
Needle valve (female x female)
Needle valve (male x female)
1/4 - 18 NPT
33/64 TYP
[13.10 TYP]
1-3/4 OPEN
[44.45 OPEN
Ø23/32
[Ø18.26]
DWYER INSTRUMENTS, LLC | dwyer-inst.com
Valves,
Needle
429
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