RF Valve Joint Flange

QS Flange: Yancheng RF Valve Joint Flange

Forged stainless steel RF valve joint flange, 4 inch 150LB SO per ANSI B16.5, for fillet-welded connections to valves and equipment in corrosive service.

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One-Minute Overview

SO-type RF flange that welds to a valve, pump or pipe run by fillet weld.
Forged stainless steel body rated 150LB, 4 inch, dimensioned to ANSI B16.5.
Raised face matches standard 150LB gasket arrangements for a tight seal.
High corrosion resistance covers oil, gas, chemical and water treatment lines.

The RF valve joint flange brings a 4 inch line onto a valve or piece of equipment with a fillet weld instead of a butt-welded neck. Forged stainless steel carries the 150LB rating, the raised face takes standard 150LB gaskets, and every dimension follows ANSI B16.5, so the flange lines up with standard flanges of the same size and class across the line.

Name: RF Valve Joint Flange
Size: 4"
Pressure: 150LB
Material: Stainless Steel
Flange Face: RF
Type: SO
Standard: ANSI B16.5
Process Method: Forged

Use it where a valve or pump must be tied into the line and the welder prefers a fillet weld: the SO type slides over the pipe end and the fillet weld locks it to the hub, which shortens fit-up on tie-in work. Stainless steel suits oil and gas, chemical processing and water treatment, where a corroded face would soon cost a gasket. Pick the gasket for the media, bolt with 150LB class fasteners, and tighten evenly in a star pattern so the raised face seals on the first pass.

FAQ

Q1. What standard governs this valve joint flange?

Dimensions, drilling and the raised-face finish follow ANSI B16.5 for this 4 inch 150LB flange. That means the bolt circle matches standard flanges of the same size and class, so the valve joint mates with weld neck, slip on and socket weld flanges without an adapter plate or a special gasket.

Q2. Is a fillet weld really enough to hold it?

Yes - that is how SO-type flanges are designed to work. The flange slides over the pipe, and the fillet weld around the hub carries the joint load. It is a common, accepted joint in oil and gas, chemical and water service, and it is quicker to fit than a butt-welded neck on tie-in work.

Q3. Do I need anything exotic to seal it?

Nothing exotic. The raised face takes the standard gasket for the 150LB class and your media; the trick is the usual one - clean faces, the right gasket, and bolts tightened evenly in a star pattern. Do that and the joint seals on the first pass with no drama.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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