Valve Joint Slip On Flange

QS Flange: Xiamen Valve Joint So Flange

Slip on flange built as the pipe side of a valve joint, so the valve bolts straight onto the run and can be lifted out for service.

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One-Minute Overview

Slip on flange that forms the pipe side of a valve joint.
Bore, class, facing and bolt pattern are checked against your valve.
Lets the valve be unbolted and lifted out without cutting the line.
Common on water, HVAC and dosing skids where valves are serviced often.

A valve joint flange is the interface between a valve and the pipe: the flange slips over the pipe end, gets welded, and its bolt circle then has to line up with the inlet or outlet flange of the valve. Because the flange sits loose on the pipe until it is welded, the fitter can rotate it and bring the holes into phase with the valve, which is the whole point at a valve joint. A flange welded out of phase forces the valve to be twisted back into position, and a strained valve body is a leak waiting for a maintenance window.

At a valve joint the gasket is squeezed between two machined faces, so both faces have to be flat, clean and square to the bolt axis; the flange face and the valve face are a pair, not two independent parts. Slip on construction keeps the flange adjustable during fit up, which helps where a valve has to be dropped between two fixed pipe ends, and it keeps the cost below a weld neck on the same duty. The joint is only as good as its bolting: tighten in a star or cross pattern in stages so the gasket compresses evenly, then re check torque once the line has been brought up to temperature. Size, pressure class, facing and bolt pattern are confirmed per inquiry, so the flange meets the valve you actually have. Detailed specifications are available on request.

FAQ

Q1. How do I make sure the flange meets my valve?

Send the valve face standard, the bolt circle and the number of holes, and the flange is machined to that pattern. Size, pressure class and facing are confirmed per inquiry, so the flange is matched to the valve you have rather than to a catalogue assumption.

Q2. Why put a slip on flange at a valve instead of a weld neck?

Slip on lets the flange turn on the pipe during fit up, so the holes can be phased to the valve after the valve is set in place, and it costs less. Where the joint sees heavy cycling or high pressure, a weld neck is still the stronger choice.

Q3. Can the old gasket go back in when the valve returns?

Treat the gasket as a single use part. It has already been compressed to its working thickness, so reusing it risks a leak at the very joint you just opened. Fit a new gasket of the same type and size, clean both faces, and torque the bolts evenly.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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