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Union Bonnet Needle Valves

Name: Union Bonnet Needle Valves
Brand: PERFECT ENGINEERS
Price: 350.0 INR
Availability: InStock

Price 350.0 INR/ Piece

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MOQ : 1 Piece

Union Bonnet Needle Valves Specification

Valve Type
Needle Valve

Connection Type
Threaded (NPT/BSP/BSPT), Welded, or Flanged

Features
Leak-proof, anti-blowout stem, compact design, easy maintenance

Valve Size
Available sizes: 1/8 to 1

Material
Stainless Steel 316/304, Brass, Monel, Duple

Control System
Manual, multi-turn handwheel

Sealing
PTFE, Graphite or Metal-to-metal seats

Structure
Union bonnet, straight or angle pattern

Application
Used in instrumentation, process and power plants for precise flow and pressure control

Type
Union Bonnet Needle Valve

Power
Manual operation

Pressure
Up to 6000 psi (413 bar) depending on size and construction

Media
Compatible with air, gas, steam, oil & liquids

Port Size
1/8 to 1 (threaded or welded ends)

Temperature
-20C to 230C (Standard); up to 450C with special packing

Disc
Precision tapered needle

Pin
High strength spindle pin for stem support

End Connection
Male/Female/Socket Weld/Flanged as per requirement

Stem Type
Non-rotating, rising stem design

Gland Packing Adjustment
Adjustable for in-line maintenance without valve removal

Locking Arrangement
Optional for tamper-proof operation

Handle Material
Stainless Steel or Aluminum

Bonnet Design
Union bonnet with backseat arrangement for safety

Flow Control
Precise linear flow adjustment

Working Standards
Designed as per ASME B16.34/BS/DIN standards

Testing
Helium leak tested and hydrostatic tested at 1.5x working pressure

Packing Type
PTFE (standard) or graphite (high temperature)

Union Bonnet Needle Valves About

Union Bonnet Needle Valves from Perfect Engineers are precision-engineered flow control valves designed for accurate regulation of liquids and gases in high-pressure hydraulic, pneumatic, instrumentation, and industrial systems. The union bonnet construction allows easy maintenance and replacement of internal components without disturbing the pipeline connection, making these valves ideal for applications requiring regular servicing and long-term reliability.

Manufactured using high-quality Stainless Steel, Carbon Steel, Brass, and other suitable alloys, these valves offer excellent mechanical strength, corrosion resistance, durability, and dependable sealing performance. The fine-threaded stem and tapered needle provide precise and gradual flow adjustment, ensuring accurate control of process media.

Key Features:

Union bonnet design for easy maintenance
Precise flow regulation
Fine-threaded stem with tapered needle
Suitable for high-pressure applications
Reliable leak-resistant sealing
Robust and durable construction
Available in multiple sizes and material grades
BSP, NPT, and other connection options available

Applications:

Hydraulic and pneumatic systems
Instrumentation and control lines
Oil & gas industries
Chemical and petrochemical plants
Power generation
Process industries
Laboratory and testing equipment

Perfect Engineers supplies high-quality Union Bonnet Needle Valves engineered for precise flow control, ease of maintenance, long service life, and dependable performance across demanding industrial applications.

Robust Construction for Reliable Operation

Manufactured to international standards (ASME B16.34/BS/DIN), Union Bonnet Needle Valves combine high strength, premium sealing materials, and compact union bonnets with a backseat arrangement. Their non-rotating, rising stem design, supported by a high-strength spindle pin and available in straight or angle patterns, guarantees precise and reliable performance in demanding environments.

Versatile End Connections and Packing Options

You can customize these valves with threaded (NPT/BSP/BSPT), socket weld, or flanged end connections to match your system requirements. The standard PTFE packing ensures leak-tightness at temperatures between -20C to 230C, while graphite packing is ideal for higher-temperature applications up to 450C.

Comprehensive Testing and Safety Features

Every valve is subjected to rigorously controlled helium leak and hydrostatic tests at 1.5 times their working pressure, ensuring robust performance up to 6000 psi. The union bonnet with backseat arrangement and anti-blowout stem enhance safety and operational reliability in critical services.

FAQ's of Union Bonnet Needle Valves:

Q: How does the non-rotating, rising stem design benefit flow control in these needle valves?

A: The non-rotating, rising stem design minimizes friction on the sealing packing, ensuring precise linear flow adjustment and extending the lifetime of seals. It provides smooth operation and maintains leak-tight integrity even during frequent cycling.

Q: What packing materials are available, and when should graphite packing be selected over PTFE?

A: Standard PTFE packing is suitable for most applications up to 230C. Graphite packing should be selected for high-temperature environments up to 450C or when chemical compatibility with process media is required.

Q: Where can these union bonnet needle valves be installed within a plant?

A: These valves are ideal for installation in instrumentation lines, process and power plant control panels, and piping systems requiring precise flow and pressure regulation for air, gas, steam, oil, or liquids.

Q: What end connection types are offered, and how do I choose the right one?

A: You can select from male/female threaded, socket weld, or flanged ends, depending on your piping system's requirements. Threaded ends are suitable for easy installation, while socket weld and flanged options provide added security in high-pressure applications.

Q: What is the process for adjusting gland packing in-line without removing the valve?

A: The union bonnet design allows users to conveniently adjust the gland packing while the valve remains in position, enabling routine maintenance and sustained leak-tight performance with minimal downtime.

Q: What is the benefit of the optional locking arrangement on these needle valves?

A: The optional locking mechanism ensures tamper-proof operation, safeguarding against unauthorized flow changes and enhancing system safety in critical or remote installations.

Q: How are these valves tested to ensure leak-proof performance?

A: Each valve undergoes stringent helium leak testing and hydrostatic pressure testing at 1.5 times its designated working pressure, proving integrity and durability under demanding operational conditions.

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