UN Series Union Bonnet Needle Valves

Experience precision fluid control with Raydafon Guoup's UN Series Union Bonnet Needle Valves. Designed for industries requiring reliable flow regulation, these valves offer durable construction, easy maintenance, and superior sealing. Ideal for professionals in automation and instrumentation, they deliver confidence and efficiency, solving flow management challenges with unmatched quality.

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Product Description

UN Series Union Bonnet Needle Valves

Union bonnet needle valves are a type of valve that is used to control the flow of liquids and gases. They are typically used in applications where precise control is required, such as in instrumentation and process control systems.

Union bonnet needle valves are characterized by their union bonnet construction. This means that the bonnet, or body, of the valve is connected to the stem by a union joint. This allows the bonnet to be removed without having to disconnect the piping from the valve. This makes it easy to inspect and maintain the valve without disrupting the flow of fluid.

Needle valves are also characterized by their fine needle-like stem. This stem allows for very precise control of the flow of fluid. Needle valves are typically used to regulate the flow of small amounts of fluid, but they can also be used to control the flow of larger amounts of fluid by using multiple valves in series.

Union bonnet needle valves are available in a variety of materials and sizes to meet the needs of a wide range of applications. Some of the most common materials used for union bonnet needle valves include stainless steel, brass, and bronze. Union bonnet needle valves are also available in a variety of end connections, such as pipe threads, flanges, and compression fittings.

UN Series Union Bonnet Needle Valve Features:

One-piece forged body.
Two-stem design: thread-hardened upper stem and smooth surface-hardened lower stem.
Accidentalvalve disassembly disabled by union bonnet construction
Upper stem thread lubricant isolated from system media.Linearly instead of helical movement of the nonrotating lower stem, avoiding galling damage to the seat and tips well as reducing the total friction area between the packing and the lower stem.
Safety back seating seating fully open position.
Panel mounting is available as an option
Steady and durable fastening of the handle by double lock pins.
Handle color options are available.
Leak-tight performance testing for every valve with nitrogen at the maximum working pressure
Maximum working pressureUN Series-Stainless steel:6000 psig（414 bar）UNH Series-Stainless steel:10000 psig（689 bar）
Working temperature：PTFE:-65°F to 450°F（-54°C to 232℃）PEEK:-65°F to 500°F（-54°C to 260°℃）Graphite:-65°F to 1200°F（-54°C to 649°℃）

Union Bonnet Needle Valve Standard Materials of Construction:

Item

Component

Valve Body Material

316 SS

Alloy 400

Titanium

Alloy C-276

Handle

Anodized aluminum or stainless steel or black knob

Set Screw

Stainless steel

Upper Stem

316 SS/A276

Packing Bolt

321 SS/A276

Lock Nut

316 SS/A276

Panel Nut

316 SS/B783

Gland

316 SS/A276

Alloy R-405/B164

Titanium Gr 4/B348

Alloy C-276/B574

Packing

PTFE or PEEK or graphite

Bonnet

316 SS/A479

Alloy R-405/B164

Titanium Gr 4/B348

Alloy C-276/B574

UInion Nut

316 SS/A276

11a11b

Lower Stem

316 SS/A276

Alloy R-405/B164

Titanium Gr 4/B348

Alloy C-276/B574

Body

316 SS/A182

Alloy 400/B164,

Titanium Gr 4/B348

Alloy C-276/B564

UN Series Union Bonnet Needle Valve Dimensions:

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Contact Info

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Address

Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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Tel

86-574-87167707
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Email

[email protected]

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5.0

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Basic Ordering Number	Connection Type and Size		Orifice In.(mm)	Cv	Dimension, in.(mm)
Basic Ordering Number	Inlet	Outlet	Orifice In.(mm)	Cv	L1	L2	L3	L4	C	D	E	F	H
-UN-FN2-4	1/8 Female NPT	1/8 Female NPT	0.16(4.0)	0.35	1.00(25.4)	1.00(25.4)	0.89(22.6)	1.00(25.4)	0.39(10.0)	1.77(45.0)	1.09(27.7)	0.59(15.0)	3.04(77.2)
-UN-FN4-4	1/4 Female NPT	1/4 Female NPT	0.16(4.0)	0.35	1.03(26.2)	1.03(26.2)	0.89(22.6)	1.00(25.4)	0.39(10.0)	1.77(45.0)	1.09(27.7)	0.59(15.0)	3.04(77.2)
-UN-FN6-6	3/8 Female NPT	3/8 Female NPT	0.25(6.4)	0.80	1.13(28.6)	1.13(28.6)	1.00(25.4)	1.13(28.6)	0.50(12.7)	2.50(63.5)	1.34(34.0)	0.78(19.8)	3.70(94.0)
-UN-FN8-10	1/2 Female NPT	1/2 Female NPT	0.39(10.0)	1.80	1.56(39.6)	1.56(39.6)	1.31(33.3)	1.56(39.6)	0.78(19.8)	3.50(88.9)	1.91(48.5)	1.03(26.2)	4.85(123)
-UN-FN12-10	3/4 Female NPT	3/4 Female NPT	0.39(10.0)	1.80	1.63(41.3)	1.63(41.3)	-	-	0.78(19.8)	3.50(88.9)	1.91(48.5)	1.03(26.2)	4.85(123)
-UN-FN16-10	1 Female NPT	1 Female NPT	0.39(10.0)	1.80	1.81(46.0)	1.81(46.0)	-	-	1.00(25.4)	3.50(88.9)	2.13(54.0)	1.03(26.2)	5.10(129)

-UN-MN2-4	1/8 Male NPT	1/8 Male NPT	0.16(4.0)	0.35	1.00(25.4)	1.00(25.4)	0.89(22.6)	1.00(25.4)	0.39(10.0)	1.77(45.0)	1.09(27.7)	0.59(15.0)	3.04(77.2)
-UN-MN4-4	1/4 Male NPT	1/4 Male NPT	0.16(4.0)	0.35	1.03(26.2)	1.03(26.2)	0.89(22.6)	1.00(25.4)	0.39(10.0)	1.77(45.0)	1.09(27.7)	0.59(15.0)	3.04(77.2)
-UN-MN6-6	3/8 Male NPT	3/8 Male NPT	0.25(6.4)	0.80	1.13(28.6)	1.13(28.6)	1.00(25.4)	1.13(28.6)	0.50(12.7)	2.50(63.5)	1.34(34.0)	0.78(19.8)	3.70(94.0)
-UN-MN8-10	1/2 Male NPT	1/2 Male NPT	0.39(10.0)	1.80	1.56(39.6)	1.56(39.6)	1.31(33.3)	1.56(39.6)	0.78(19.8)	3.50(88.9)	1.91(48.5)	1.03(26.2)	4.85(123)
-UN-MN12-10	3/4 Male NPT	3/4 Male NPT	0.39(10.0)	1.80	1.63(41.3)	1.63(41.3)	-	-	0.78(19.8)	3.50(88.9)	1.91(48.5)	1.03(26.2)	4.85(123)
-UN-MN16-10	1 Male NPT	1 Male NPT	0.39(10.0)	1.80	1.81(46.0)	1.81(46.0)