Ptfe Pfa Lined Globe Valves

A lined globe valve isolates aggressive chemical streams from pressure-retaining metallic shells while delivering precise linear throttling and zero-leakage shutoff. Designed with an impermeable fluoropolymer barrier and a rising stem mechanism, this construction achieves ANSI FCI 70-2 Class VI bubble-tight sealing inside piping conveying concentrated sulfuric acid, hydrochloric acid, and wet chlorine gas. Chemical plants install this assembly to eliminate pitting attack without procuring high-cost nickel alloys.

Cavitation Suppression and Velocity Attenuation

Internal body contours force fluid through an S-shaped passage, dissipating kinetic velocity before fluid reaches the orifice area.

When metering concentrated inorganic reagents, a ptfe lined globe valve prevents seat washing under continuous fine-increment regulation. Thick molded polymer dampens cavitation impingement near the vena contracta, preserving plug geometry and linear flow characteristics during high-pressure drops.

Fluoropolymer Lining Material Performance Matrix

Hermetic Bellows Containment and Liner Retention

Stem leakage creates severe toxic hazards during hazardous fluid transfer operations. A pfa lined globe valve eliminates stem escape paths using multi-convolution fluoropolymer bellows assemblies backed with chevron packing rings.

Machined dovetail anchoring grooves cast inside the ductile iron shell secure the internal sleeve against wall surfaces. This mechanical retention stops liner collapse and prevents delamination during severe thermal cycling or line vacuum conditions.

Pneumatic Actuation and Dynamic Loop Response

Automated neutralization loops demand rapid stroke positioning and repeatable travel. Equipping pfa lined globe valves with pneumatic diaphragm actuators provides immediate stroking response alongside fail-safe closure during instrument air supply failure.

Direct yoke mounting connects digital positioners to the rising stem, eliminating linkage hysteresis. Continuous signal feedback maintains seat tightness and stable chemical dosing throughout severe continuous operations.

Product Parameter

Materials of Main Parts

Technical Specification