Ptfe Pfa Lined Globe Valves

A lined globe valve isolates corrosive process streams from pressure-retaining metallic shells while delivering linear throttling and zero-leakage isolation. Designed with an internal fluoropolymer barrier and a rising stem, this configuration delivers ANSI FCI 70-2 Class VI bubble-tight shutoff inside lines conveying boiling hydrochloric acid, concentrated sulfuric acid, and wet chlorine gas. Industrial processing plants utilize this design to resist pitting and transgranular stress cracking without purchasing expensive high-nickel alloys.

Fluid Velocity Attenuation and Micro-Throttling Stability

Internal flow paths route fluid across an S-shaped contour to dissipate kinetic velocity before media passes the orifice. In chemical metering lines, a ptfe lined globe valve prevents seat washing and cavity erosion under continuous fine-increment regulation. The thick fluoroplastic layer dampens cavitation impingement near the vena contracta, preserving plug contour integrity and flow stability during high-pressure drops.

Fluoroplastic Polymer Selection for Harsh Media Handling

Bellows Stem Containment for Zero Fugitive Emissions

Stem leakage introduces severe toxic hazards when handling hazardous liquids. A pfa lined globe valve integrates multi-convolution fluoropolymer bellows assemblies backed with adjustable chevron packing rings. Dovetail anchoring cast directly into the ductile iron body retains the polymer layer against metal surfaces, preventing liner collapse or vacuum tear-out during thermal shock cycles.

Electric Actuator Modulating Response and Automation Integration

Automated dosing loops require precise digital positioning without instrument air infrastructure. Equipping pfa lined globe valves with intelligent multi-turn electric actuators provides direct stem coupling, optical position feedback, and fail-safe battery returns. Modulating input signals regulate stroke positioning down to micro-increments, maintaining tight shutoff and leak-free chemical flow control during demanding process operations.

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