PFA Flare Fittings for PFA/PTFE Tubing

Overview

RUNZE PFA flare fittings connect prepared PFA or PTFE tube ends to a tapered PFA sealing face. The flared tube and retaining nut form the tube connection without a separate bead, welding or adhesive. Options cover 1/4, 3/8, 1/2, 3/4 and 1 inch tube OD, with straight, elbow, tee, bulkhead and male-thread configurations. Match the fitting to your tube, flare preparation and operating conditions.

Flared Tube-to-Face Sealing

The tube end is flared before assembly and seats against the tapered face of the fitting body. Tightening the PFA nut retains the prepared tube end against this face. There is no separate bead in the flare connection.

Correct flare preparation is essential. Use the tooling and preparation procedure appropriate to the tube material, tube size and fitting model. A bead-lock tube end is not a substitute for a correctly prepared flare. The tube connection does not require welding, adhesive or an elastomer O-ring.

Specifications and Tube Sizes

Select the pressure-temperature curve for the actual tube size. The flare-fitting chart separates the 1/4 and 3/8 inch sizes from the larger sizes, so one curve must not be applied to the whole range. Review the intended working point with RUNZE, including the fluid and any changes in temperature during operation.

These metric values are conversions of the inch sizes, not alternative nominal metric tube sizes. For example, 1/4 inch tubing is 6.35 mm OD; it must not be substituted with 6 mm tubing without a separately specified fitting. Tube OD is the selection dimension, not tube inside diameter.

Connection Types and Model Selection

Plan the flare connection around the fluid-line layout: straight unions join tube runs, elbows change direction and tees provide branches. Select equal or reducing connections as needed and state the tube OD at every port. The chosen model must support the complete size combination, not only the largest tube in the assembly.

The RZ-Y series identifies the flare connection family. For example, RZ-Y-H-1/4-A denotes an equal straight connection for 1/4 inch tubing in the catalogue’s A material option. A and C identify the catalogue’s imported and domestic material options respectively. Confirm the full model code and material option in the quotation.

A flare-to-thread adapter combines two different interfaces: a flare connection for the tube and a male thread for the equipment port. Specify both interfaces when ordering. Include the equipment thread designation or a port drawing so the thread is not inferred from the tube size.

PFA Material for Chemical Fluid Paths

The PFA body and nut retain the flared tube against a PFA sealing face. With no separate bead at this connection, the tube preparation and face condition are central to the assembly. The supplied material data describes virgin PFA and non-metallic wetted fitting surfaces.

Chemical suitability depends on the actual medium, concentration, temperature and exposure conditions. Review all wetted components in the system, including tubing and any connected equipment. The fitting is not a blanket compatibility guarantee for every chemical or process.

Typical Applications

Consider PFA flare tube fittings where the instrument or process line specifies a prepared flare interface. Application examples include semiconductor chemical delivery, ultrapure-water lines and analytical fluid handling. The supplied application images also cover pharmaceutical, fine-chemical, photovoltaic and battery-process equipment.

For an existing installation, match the flare family, tubing and connection dimensions before ordering a replacement. For a new system, plan the flare preparation workflow as well as the fitting layout. Confirm any process-purity or cleaning requirements separately; application examples do not establish certification.

Assembly and Maintenance Considerations

Check that the tube and fitting match in size and connection family. Keep tube ends and sealing surfaces clean, and inspect them for damage before assembly.

For flare assembly, prepare the tube end using the specified flaring procedure and tooling. Inspect the flare for damage or uneven preparation before seating it on the fitting face and securing the nut.

No universal tightening torque is specified in this page. Use the instructions for the selected fitting, leak-test the assembled system under controlled conditions, and depressurize it before disconnection. Replace worn or damaged sealing components instead of relying on repeated tightening.

Packaging and Identification

Packaging examples below show fittings from the PFA range. Labels include different connection series and should not be used to identify the model from photographs alone. The model, size, material option, quantity and packaging requirements must match the confirmed quotation.

Frequently Asked Questions

What is the difference between bead-lock and flare fittings?

A bead-lock connection uses a separate bead with a flat-cut tube end. A flare connection uses a prepared flared tube end against a tapered fitting face. The assembly methods and connection components are different; they are not interchangeable simply because the tube OD matches.

Do I need a tube-flaring tool?

Yes. This connection uses a prepared flared tube end. Confirm the appropriate tool and preparation procedure for the selected PFA or PTFE tube. A flat-cut tube end alone does not provide the intended flare-to-face interface.

Do all flare fitting sizes have the same pressure limit?

No. The supplied chart provides size-dependent pressure curves, and the allowable pressure changes with temperature. Identify the actual size and operating temperature before selecting a working pressure.

Can I reuse the tube flare after disassembly?

Reuse depends on the condition of the flare and the fitting face. Inspect both before reassembly and follow the specified preparation and assembly procedure. A damaged or distorted tube end should not be treated as a serviceable flare.

What should I send for a quotation?

Provide the flare fitting shape, tube material and OD, any reducing combination, and the required thread or panel interface. Include the fluid, concentration, temperature, pressure, quantity and material option. Tell RUNZE whether you already have flare-preparation tooling or need the preparation requirements for a new installation.

Request a PFA Fitting Recommendation

Contact RUNZE with your tube specification and operating conditions. We can review the required flare configuration and quote the matching model. Please confirm the final connection dimensions and system compatibility before purchase.

PEEK One-Piece Fittings

PEEK Identification Joint

Injector Valve SV-07B