Raised Face Weld Neck Flange

QS Flange: Suzhou Raised Face Wn Flange

Raised face weld neck flange pairing a tapered hub with a machined RF annulus that concentrates gasket load for cyclic process duty.

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One-Minute Overview

Weld neck body with a raised face where the gasket is compressed.
The raised annulus keeps sealing load off the bolted area of the face.
Suits lines that cycle in temperature and must stay leak tight.
Size, class, face finish and material are confirmed at inquiry.

A raised face weld neck flange combines two features that solve different halves of the same problem: the tapered hub takes the mechanical load out of the weld, and the raised face puts the sealing load exactly where the gasket sits.

The raised face is a machined annulus standing above the rest of the flange face. When the studs are tightened, the load path runs through that annulus and compresses the gasket between two raised faces, while the outer part of the face stays clear. Because the sealing line is short and well defined, a given bolt load produces a higher gasket stress than it would on a full flat face, and the joint keeps its seal as the line heats, cools and moves.

Fitting the two together takes some care. The mating flange must carry the same face type and a finish suited to the gasket, the gasket must sit inside the raised diameter, and the studs must be tightened in a crossing pattern in stages so the load arrives evenly around the ring. Where the joint is insulated for electrical isolation, the gasket kit and sleeve set are matched to the same face geometry. Face type, finish, gasket, bolting and pressure class are confirmed with you at inquiry, so the assembly is checked against the whole joint rather than the flange alone.

Detailed specifications, face finish data and drawings for this raised face weld neck flange are available on request.

FAQ

Q1. Why put the sealing load on a raised face?

A short, well defined annulus gives a higher unit gasket stress for the same bolt load, and it keeps the sealing line away from the bolt holes. On a line that cycles in temperature, that concentrated seating is what lets the joint follow movement without the gasket losing contact.

Q2. Can it be bolted to a flat face flange?

Not as a rule. A raised face is designed to seat against another raised face, with the gasket confined inside the raised diameter. Mating it to a flat face changes the load path and the gasket seating. Send the mating flange detail and we will confirm the face combination before anything is quoted.

Q3. How should the studs be tightened?

In a crossing or star pattern, in stages, up to the torque the gasket and bolting call for. Even arrival of load around the ring is what keeps the raised face seated squarely. Re-check after the line has been through a first heat cycle, since thermal movement can relax the joint.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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