Supplier of Fluid control products including instrumentation TUBE FITTINGS, PIPE FITTINGS and Valves

CALL US | (281) 437 8400



Pressure rating up to 5000psig (340bar) @38°C (100°F)
Temperature rating from -53?(-65?) to 232? (450?) with standard PTFE packing, up to 315?(600?) with PEEK packing Compact forged body with straight and angle pattern for design of miniaturized fluid systems
Hardened stem threads and forged body for long cycle life

VN5 Seires Features

Integral bonnet design to eliminate unintentional stem back-out Panel mounting without packing disruption Wide choices of port sizes and end connections

VN5 Series Features
Materials of Construction
No. Description Materials
Body Material 316SS Brass Alloy 400
1 Body 316SS Brass Alloy 400
2 Nut 316SS Brass Alloy 400
3 Front Ferrule 316SS Brass Alloy 400
4 Back Ferrule 316SS Brass Alloy 400
5 Stem 316SS Brass Alloy R-405/B164
6 Packing Ring 316SS Brass Alloy R-405/B164
7 Packing PTFE
8 Packing Gland 316SS Brass Alloy R-405/B164
9 Packing Nut 316SS Brass Alloy R-405/B164
10 Panel Nut 316SS Brass 316SS
11 Handle Nylon with brass insert
12 Handle Screw 304SS


Regulation and shut-off of fluids and gases for wide range of general purpose
Sampling systems, laboratories, corrosive and high pressure service, valves – pressure gauge and cylinder, panel board instrumentation

Sour Environment Services

UNILOK valves are comply with NACE MR-0175/ISO 15156 for sour oilfield application or NACE MR-0103 for petroleum refining operations. To order, add-N to the end of part number.


UNILOK valves are free from machine oils, loose particles and grease throughout the close cleaning process.


Every valve is 100% factory tested with air and nitrogen at 1000psig(69bar) for leakage at the seat and packing. Each test is performed to a maximum allowable leak rate of 0.1scc/min.

Important Notification

Proper installation, materials compatibility, operation and maintenance of these valves are the responsibility of the user. The total system design must be taken into consideration to ensure optimal performance and safety.
The packing adjustment may be required during the valve’s service life.

How To Order

UNILOK VN5 series needle valves are ordered by part number as shown below.

Example: The fllowing part number, VN52U-04T-SS is designated for VN5 series needle valve with both 1/4″ UNILOK tube fitting, 316SS, round handle.

VN5 Series How to Order
Valve Type
N5 Straight Pattern
N5A Angle Pattern
Connection Type
U UNILOK Tube Fitting
F Female NPT or ISO7/1[PT]
M Male NPT or ISO7/1[PT]
WS- Socket Weld - Tube
WS- Socket Weld - Pipe
Connection Size
Fractional[Inch] Tube O.D. Designation
inch 1/8 1/4 3/8 1/2 3/4 1
mm 3.17 6.35 9.52 12.70 19.05 25.4
Designator 02T 04T 06T 08T 12T 16T
Metric Tube O.D. Designation
mm 6 8 10 12 16
Designator M06T M08T M10T M12T M16T
Pipe Size Designation [NPT or ISO7/1-PT]
Pipe Size 1/8 1/4 3/8 1/2
Designator 02N/R 04N/R 06N/R 08N/R
Weld Size Designation
Tube Size 1/4 3/8 1/2
Designator 04T 06T 08T
Pipe Size 1/4 3/8 1/2
Designator 04P 06P 08P
Body Materials
SS 316SS
BS Brass
MO Alloy 400
Stem Type
None Vee Stem
R Regulating Stem
S Soft-Seat Stem
Packing Materials
Handle Type
None Nylon Round Handle
B Bar Handle

Pressure - Temperature Ratings by Packing Materials
Pressure - Temperature Ratings by Packing Materials
Working Pressure at Temperature
Working Pressure at Temperature
Number of Handle Turns - Flow Coefficient (Cv)
Number of Handle Turns - Flow Coefficient (Cv)
Number of Handle Turns - Flow Coefficient (Cv)

                   Vee or Soft-seat Stem
                       Regulating Stem

Stem Type

Metal to metal vee stem is standard for pressure tightness even at elevated temperature. Regulating stem and soft-seat stem with KEL-F are available as optional.
The excessive force when closing valve may damage both seat and stem tip, particularly soft-seat stem.

Stem Type Vee Stem
Stem Type Soft-Seat Type
Stem Type Regulating Stem

Vee Stem
Pressure tightness at elevated temperature

Regulating Stem
Flow rate control

Soft-seat Stem
Repetitive shut-off for gas

Handle Type

Black nylon round handle is standard. For the valves with brass body and soft-seat stem, standard round handle is recommended.
Optional stainless steel bar handle is available.

Handle Type SS Bar Handle

                            SS Bar Handle

Ordering Information & Dimensions

VN5 Ordering Information and Dimensions

Female ISO7/1 Tapered Threads (PT) are available for all fractional sizes of
VN5 series valves. Add “R” as a suffix instead of “N”.
Dimensions are for reference only and are subject to change without prior notice.