UNH Series Union Bonnet Needle Valves

UNH Series Union Bonnet Needle Valves

Union bonnet needle valves are a type of valve that is used to precisely control the flow of fluids. They are characterized by their union bonnet construction, which allows the body of the valve to be easily removed for maintenance without disassembling the entire valve. Union bonnet needle valves are typically used in high-pressure and high-temperature applications, such as in the chemical, petrochemical, and power generation industries.

Some of the key benefits of union bonnet needle valves include:

• Precise flow control: Union bonnet needle valves have a fine-tuned needle that allows for precise control of the flow of fluids. This is important in applications where even a small change in flow can have a significant impact on the process.
• High pressure and temperature ratings: Union bonnet needle valves are available with high pressure and temperature ratings, making them suitable for use in a wide range of applications.
• Easy maintenance: The union bonnet construction of these valves makes them easy to maintain. The body of the valve can be easily removed for maintenance without disassembling the entire valve.

Union bonnet needle valves are available in a variety of materials, including stainless steel, brass, and Monel. They are also available with a variety of end connections, such as threaded, welded, and flanged.

UNH 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 pressure:
  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

1

Handle

Anodized aluminum or stainless steel or black knob

2

Set Screw

Stainless steel

3

Upper Stem

316 SS/A276

4

Packing Bolt

321 SS/A276

5

Lock Nut

316 SS/A276

6

Panel Nut

316 SS/B783

7

Gland

316 SS/A276

Alloy R-405/B164

Titanium Gr 4/B348

Alloy C-276/B574

8

Packing

PTFE or PEEK or graphite

9

Bonnet

316 SS/A479

Alloy R-405/B164

Titanium Gr 4/B348

Alloy C-276/B574

10

UInion Nut

316 SS/A276

11a 11b

Lower Stem

316 SS/A276

Alloy R-405/B164

Titanium Gr 4/B348

Alloy C-276/B574

12

Body

316 SS/A182

Alloy 400/B164,

Titanium Gr 4/B348

Alloy C-276/B564

UNH Series Union Bonnet Needle Valve Dimensions:

Basic Ordering Number	Connection Type and Size		Orifice in(mm)	Cv	Dimension, in.(mm)
	Inlet	Outlet			L1	L2	C	D	E	F	H
-UNH-FN2-4	1/8 Female NPT	1/8 Female NPT	0.16 (4.0)	0.35	1.00 (25.4)	1.00 (25.4)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-FN4-4	1/4 Female NPT	1/4 Female NPT	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-FN6-6	3/8 Female NPT	3/8 Female NPT	0.25 (6.4)	0.80	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-FN8-10	1/2 Female NPT	1/2 Female NPT	0.25 (6.4)	0.80	1.56 (39.6)	1.56 (39.6)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.13 (105)

Basic Ordering Number	Connection Type and Size		Orifice in(mm)	Cv	Dimension, in.(mm)
	Inlet	Outlet			L1	L2	C	D	E	F	H
-UNH-MN4-4	1/4 Male NPT	1/4 Male NPT	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-MN6-6	3/8 Male NPT	3/8 Male NPT	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-MN8-10	1/2 Male NPT	1/2 Male NPT	0.25 (6.4)	0.80	1.56 (39.6)	1.56 (39.6)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.13 (105)
-UNH-SWT4-4	1/4 Soket Weld	1/4 Soket Weld	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.70 (94.0)
-UNH-SWT6-6	3/8 Soket Weld	3/8 Soket Weld	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0))
-UNH-SWT8-6	1/2 Soket Weld	1/2 Soket Weld	0.25 (6.4)	0.80	1.56 (39.7)	1.56 (39.7)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.85 (123)
-UNH-SWM12-6	12 mm SW	12 mm SW	0.25 (6.4)	0.80	1.56 (39.7)	1.56 (39.7)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.85 (123)
-UNH-SWM14-6	14 mm SW	14 mm SW	0.25 (6.4)	0.80	1.56 (39.7)	1.56 (39.7)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.85 (123)
-UNH-FT4-4	1/4” Tube	1/4” Tube	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-FT6-6	3/8” Tube	3/8” Tube	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UNH-FT8-6	1/2” Tube	1/2” Tube	0.25 (6.4)	0.70	1.97 (50.0)	1.97 (50.0)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.25 (108)
-UN-MT10-6	10 mm	10 mm	0.16 (4.0)	0.35	1.13 (28.6)	1.13 (28.6)	0.50 (12.7)	2.50 (63.5)	1.34 (34.0)	0.78 (19.8)	3.31 (84.0)
-UN-MT12-6	12 mm	12 mm	0.25 (6.4)	0.70	1.97 (50.0)	1.97 (50.0)	0.78 (19.8)	3.50 (88.9)	1.91 (48.5)	1.03 (26.2)	4.25 (108)

1. Sizes and types listed are standard. Other sizes and types are available upon request; refer to the ordering information.
2. Dimensions are shown with HZPT nuts finger-tightened. All dimensions are for reference only and are subject to change.
3. For dimensions not shown above, please contact the authorized representative or HZPT employees.

Benefits of Using the Union Bonnet Needle Valves:

Union bonnet needle valves offer a number of benefits over other types of needle valves, including:

• Easy maintenance: The union bonnet design allows the valve body and bonnet to be easily separated for maintenance and inspection, without having to remove the valve from the pipeline. This can save time and money, and it can also help to reduce downtime.
• Reduced risk of leakage: The union bonnet design provides a tight seal between the valve body and the bonnet, which can help to reduce the risk of leakage. This is especially important in applications where the valve is handling hazardous or corrosive fluids.
• Increased durability: Union bonnet needle valves are typically constructed from forged materials, which makes them more durable and resistant to high pressures and temperatures. This makes them ideal for use in demanding applications.
• More precise flow control: Union bonnet needle valves typically have a longer stem travel than other types of needle valves, which gives them more precise flow control. This is especially important in applications where small changes in flow rate can have a big impact on the system.
• Better performance in corrosive environments: Union bonnet needle valves can be made with a variety of corrosion-resistant materials, which makes them suitable for use in corrosive environments. This is important in applications such as chemical processing and oil and gas production.

Overall, union bonnet needle valves offer a number of benefits over other types of needle valves, making them a good choice for a wide range of applications.

Here are some specific examples of applications where union bonnet needle valves are commonly used:

• Chemical processing
• Oil and gas production
• Power generation
• Food and beverage processing
• Pharmaceutical manufacturing
• Instrumentation and control systems

If you are looking for a needle valve that is easy to maintain, durable and offers precise flow control, then a union bonnet needle valve is a good option to consider.

How Does the Union Bonnet Needle Valve Work?

A union bonnet needle valve is a type of valve that uses a threaded union to connect the bonnet to the body of the valve. This type of construction makes it easy to disassemble the valve for maintenance or repair without having to remove it from the pipeline.

Needle valves are used to precisely control the flow of fluids and gases. They have a tapered needle that fits into a seat to open or close the valve. The needle is typically operated by a handwheel or actuator.

To open a union bonnet needle valve, the handwheel is turned counterclockwise. This raises the needle out of the seat, allowing the fluid or gas to flow. To close the valve, the handwheel is turned clockwise, which lowers the needle into the seat.

Union bonnet needle valves are typically used in applications where precise flow control is required, such as in medical devices, chemical processing equipment, and analytical instruments. They are also used in a variety of other applications, such as hydraulic and pneumatic systems, water and wastewater treatment systems, and food and beverage processing equipment.

Here is a more detailed explanation of how a union bonnet needle valve works:

1. The fluid or gas enters the valve body through the inlet port.
2. The fluid or gas then flows through the orifice, which is the opening between the needle and the seat.
3. The needle is controlled by the handwheel or actuator.
4. When the handwheel is turned counterclockwise, the needle is raised out of the seat, allowing the fluid or gas to flow through the orifice at a higher rate.
5. When the handwheel is turned clockwise, the needle is lowered into the seat, restricting the flow of fluid or gas through the orifice.
6. When the needle is fully seated, the valve is closed and no fluid or gas can flow through the orifice.

Union bonnet needle valves are typically made of metal, such as stainless steel or brass. They can also be made of plastic or other materials for specific applications.

Union bonnet needle valves are available in a variety of sizes and configurations to meet the needs of different applications. They are also available with a variety of options, such as different types of seats, packing materials, and actuators.

China Needle Valve Manufacturers

We're well-known as one of the leading needle valve manufacturers and suppliers, specializing in providing different kinds of fittings, instrument valves, and flanges. We warmly welcome you to buy high-quality needle valves in stock from our factory. Integral bonnet needle valves, integral forged needle valves, forged needle valves, union bonnet needle valves, rising plug valves, gauge valves.

1. We established in July 2008.

2. We are a professional manufacturer of Instrumentation Tube Fittings, Pipe Fittings, Needle valves, Ball Valves, Check Valves, Valve Manifolds, DIN 2353 Fittings, SAE Flanges, Sampling systems, and Water Heater Accessories.

3. Products are available in a variety of different materials, such as Carbon Steel, Stainless steel 316/316L, Duplex, Super Duplex, Hastelloy, Monel, Inconel, Incoloy, and Titanium.

4. We are located in Hangzhou City, 2 two-hour drive to Shanghai, with convenient transportation access worldwide.

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6. Always available to discuss your requirements and ensure full customer satisfaction.

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10. We also welcome OEM and ODM orders. Please feel free to contact and visit us.