What is a Flanged Globe Valve?

Flanged globe valves connect pipelines via bolted flanges instead of pipe threads. This enables fast installation/removal and suits high-pressure applications. Various materials and flange standards apply per unique demands. When threaded ends have capacity or access limitations, specifying a flanged globe valve is the solution.

What exactly constitutes a flanged globe valve, and what benefits does this design provide?

Flanged Globe Valve – An Overview

Flanges are large steel protrusions with holes around the circumference that you’ll see on valves, pumps, strainers, and other pipeline components. Technicians bolt mating flanges together to form a sealed joint and restrain the piping system pressure. This differs from threaded connections that screw directly into ports.

The explicit benefit of flanges involves the sturdy bolted joints created. This allows handling higher pressures than possible with threads alone. Flanges also permit faster installation compared to threading pipe segments. Their external design provides easy access for inspection and maintenance, too.

What is the function of a flanged globe valve?

Bronze globe valve flanged serve an important role in piping integrity and safety. The large diameter mating surfaces incorporate gaskets to form leak-tight seals even at thousands of PSI. Bolting flanges together creates robust joints that withstand pressure loads well beyond the capacity of threads.

The bolt holes follow aligned patterns, so flanges mate properly regardless of manufacturer. This enables mixing valves, pumps, strainers, and pipe spool pieces from various vendors.

Common Applications of Flanged Globe Valve

• > High-pressure steam lines

• > Refinery units

• > Chemical injection systems

• > LNG and cryogenic flows

• > Offshore platforms and subsea valves

For these critical services, flanged globe valves provide optimal control.

What is the difference between a threaded and a flanged globe valve?

While threaded valves suit low-pressure applications, flanged ends are mandatory for high-temperature or corrosion resistance needs. Let’s compare these two globe valve-ending styles.

1. Installation Differences

Threaded valves require applying pipe sealant and then physically screwing the bodies into associated fittings. This gets labor-intensive over dozens of valves. Flanged versions use simple bolt tensioning to create joints, allowing faster installation.

Flanges also enable easy valve removal for maintenance, thanks to external access. Threaded valves often land stuck, requiring pipe cutting for removal.

2. Pressure Ratings

Standard pipe threads max out around 5000 PSI ratings for steel constructions. Flanges have a minimum 150# ratings up to 4500 PSI and beyond for specialty items. Union-style ball valves allow the disconnecting of flanged valves safely.

3. Material Compatibility

Threaded valves typically utilize common materials like carbon steel and stainless steel. Custom alloys become problematic for machining threads. Flanges readily accommodate nickel alloys, duplex/SuperDuplex material, and exotic metals.

4. Layout Flexibility

The modular flange design better suits complex piping routes with tighter dimensional restrictions. Threaded connections need linear pipe runs for assembly.

For high-integrity systems beyond 5000 PSI, flanged globe valves represent the most reliable choice. Their robust construction stands up to extreme pressures and temperatures while enabling specialty alloys.

What are the different types of flanged globe valves?

Several flange standards and designs work with globe valve bodies to suit various pressure, temperature, and material compatibility needs. Common flange types include:

1. Forged Steel Flanges

150# and 300# forged steel flanges follow ASME 16.5 dimensions. They utilize raised-face or flat-face designs with a common 1/8″ gasket thickness. These forged carbon steel flanges handle over 700°F services.

2. Cast Steel Flanges

For extreme temperatures and pressures, 600# cast steel flanges conform to ASME 16.47. They withstand up to 1500°F and 4500 psi applications. The cast materials provide added durability over forged versions.

3. Blind Flanges

Blind flanges simply seal off pipe openings and allow easy isolation of unused branches. They look like standard flanges but without a hole. Useful for maintenance isolation situations.

4. Alloy and Exotic Metal Flanges

Nickel alloy flanges made of Monel, Inconel, Hastelloy, and other metals suit chemical and high-temperature use. Their corrosion and heat resistance exceed basic steel.

5. Non-Standards Flanges

For unique situations, custom flange dimensions and materials like titanium or zirconium may be specified. These don’t conform to common 150# or 600# norms.

Introduction to PANS Flanged Valves

PANS Valves specializes in precision cast steel flanged globe, check, gate, and ball valves for industrial applications. Founded in China in 1985, their 25,000 square meter foundry and machine shop facility meets stringent ISO quality standards.

PANS produces flanged valve components and bodies in carbon steel, stainless, alloy steel, duplex steel, nickel alloy, titanium and other exotic metals. Their globe valves utilize compact Quick Change trim designs to facilitate easy maintenance.

Testing on PANS valves includes shell thickness evaluation, seal validation, and flow performance verification per API 598 guidelines. They incorporate radiographic, ultrasonic, magnetic particle, and liquid penetrant exams through production.

Industries served include oil and gas, chemical processing, power generation, and general fluid handling. PANS provides both standards-compliant and customized flanged valves to handle pressures from low vacuum up to 4500# requirements.

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Conclusion

Flanged globe valves serve critical roles in high pressure, extreme temperature, and hazardous material applications where threaded connections fall short. The durability, flexibility, and accessibility of flanges enable robust performance. Choosing the right flange type involves balancing pipeline conditions and globe valve capabilities.

PANS Group offers over 25 years of experience designing and producing specialized flanged globe, check, ball, and gate valves. Their expansive product range, exotic material options, and customization flexibility meet unique demands. Contact PANS today to explore how their quality flanged valves can solve your toughest flow control challenges.