Nitrogen Flow Regulator Meter For Brazing Manufacturer,Supplier and Exporter in India
Product Code : EL-RACLE-12784
Jlab Export is a leading Nitrogen Flow Regulator Meter For Brazing Manufacturer,and suppliers in India
When copper pipe is brazed with air inside it, the hot bore turns black with oxide scale. This meter lets a gentle stream of nitrogen pass through the copper lines during brazing so the air is pushed out first. A floating ball shows the flow against a 0–75 CFH scale, and both the inlet and the outlet are 1/4 in SAE flare.
Specifications
| Use | Controlled flow of nitrogen through copper lines during brazing |
| Connections | 1/4 in SAE flare inlet and outlet |
| Flow scale | 0–75 CFH |
| Pressure | 50 psi |
| Indicator | Floating ball, read through the tube |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Workshop Practice in Purged Brazing
A common ITI and diploma exercise is to braze two joints and cut them open. Trainees square-cut copper tube with the Copper Pipe Cutter, fit a coupling and braze it with a Brazing Rod and the Portable Welding Oxygen/Acetylene Torch Kit. The first joint is made with no gas in the pipe. For the second, nitrogen from the Nitrogen Gas Cylinders runs through this meter and a hose into the tube.
Sawn open, the first joint shows flaky black scale inside and the second stays bright copper. Teachers then have students braze once with the ball set low and once set high, and compare how the high flow cools the joint and slows the filler.
Frequently Asked Questions
Why flow nitrogen through the pipe while brazing?
Copper at brazing heat reacts with the oxygen in the air inside the pipe and forms black oxide scale. The flakes later travel with the refrigerant and can block capillary tubes, strainers and expansion valves. A small nitrogen flow pushes the air out so the bore stays clean.
How do I read the flow on this meter?
The ball rises in the tube as the flow increases, and you read its position against the 0–75 CFH scale. Keep the meter upright while you read it, because a tilted tube moves the ball and gives a false figure.
How much nitrogen flow does brazing need?
Only a low flow. The aim is to replace the air in the pipe, not to blow gas through the joint. Too much flow cools the joint and can push molten filler out, so start low on the scale and raise it only if needed.
Can it be used for a pressure test?
No. This meter gives a steady low flow for purging. A standing pressure test fills the circuit and holds it at the nameplate test pressure. That is the job of the Nitrogen Pressure Test Kit with its two gauges.
What fits the flare connections?
Both ends are 1/4 in SAE flare, the same size used on standard refrigeration charging hoses. One hose runs from the nitrogen supply to the inlet, and another from the outlet to the pipe being brazed.
Other Pipework Tools and Nitrogen Supply
- Copper Pipe Bender
- Eccentric Flaring Tool
- Bending Spring (stops copper pipe kinking in a bend)
- Nitrogen Gas Cylinders (larger cylinder with trolley)
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Last updated: 5 November 2026
