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Western Digital

Western Digital VN-650 Nitrogen Purging Regulator Flowmeter

★★★★★4.8 (194 reviews)

Simplify HVAC brazing and pressure testing with preset flow settings and hand-tight cylinder connection in one compact unit.

$168.33*$189.99Save 11%
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*Price sourced from Amazon.com. Last updated:Jun 28, 2026.Price and availability are subject to change.

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Overview

The Western Enterprises VN-650 Nitrogen Purging Regulator Flowmeter is a dual-function device built for HVAC professionals who need reliable nitrogen flow control during brazing and system testing. Rather than juggling a separate regulator and flowmeter, the VN-650 integrates both into a single unit with three preset operating modes: a purge setting delivering 23–35 CFH for flowing nitrogen through copper lines during brazing, a braze setting at 3–6 CFH for lower-volume applications, and a pressure test setting rated up to 650 PSI for verifying system integrity.

Setup is straightforward thanks to the hand-tight cylinder connection, which threads onto standard nitrogen tanks without tools — a meaningful time-saver on job sites where efficiency matters. The preset flow rates eliminate the guesswork involved in dialing in manual regulators, ensuring consistent results across repeated use. For HVAC technicians performing routine brazing and pressure testing, the VN-650 reduces both the equipment needed and the time spent configuring it, making it a focused and efficient addition to a service toolkit.

Key Features

Preset purge 23-35 cfh, braze 3-6 cfh, pressure test 650 psi settings

Regulator and flowmeter in one

Hand-Tight cylinder connection

Specifications

Brand
Western Enterprises
Model
VN-650
Type
Nitrogen Purging Regulator with Flowmeter
Purge Flow Rate
23–35 CFH
Braze Flow Rate
3–6 CFH
Test Pressure
650 PSI
Cylinder Connection
Hand-Tight

Pros & Cons

👍 Pros

  • Three preset settings cover purging, brazing, and pressure testing without manual adjustment
  • Combined regulator and flowmeter in one unit reduces the number of components to carry and connect
  • Hand-tight cylinder connection enables fast, tool-free attachment to nitrogen tanks
  • 650 PSI pressure test capability handles standard HVAC system testing requirements

👎 Cons

  • Preset flow rates cannot be fine-tuned, limiting flexibility for applications outside the standard ranges
  • Designed specifically for nitrogen, so it is not suitable for use with other gases
  • No carrying case or protective cover included for field transport
  • The hand-tight connection, while convenient, may not provide the same seal security as a wrench-tightened fitting under heavy use

Frequently Asked Questions

The VN-650 has three preset settings: a purge flow rate of 23–35 CFH for nitrogen purging, a braze flow rate of 3–6 CFH for brazing operations, and a pressure test setting rated up to 650 PSI.
No, the regulator features a hand-tight cylinder connection, which allows you to attach it to a nitrogen tank without wrenches or other tools. This speeds up setup in the field.
Combining both functions into a single device eliminates the need to purchase and carry separate components. The integrated flowmeter provides a visual reading of nitrogen flow rate, while the regulator controls output pressure — all in one compact package.
It is designed primarily for HVAC work, including nitrogen purging during brazing to prevent oxidation inside copper lines, controlled-flow brazing, and pressure testing of refrigerant systems up to 650 PSI.

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