This document is an instruction sheet for Varian NW25 Throttle Valve. It introduces the features and functions of the product.
The Varian NW25 Throttle Valve combines the functions of a Throttle Valve and a Tuning Leak into one effective tool. It provides an uncalibrated source of helium designed to furnish an ample leak rate signal for tuning Varian Leak Detectors by admitting a small amount of air from the natural helium present in the atmosphere.
It combines a throttle valve and tuning leak functions to provide an uncalibrated source of helium for tuning Leak Detectors.
No, it uses the naturally occurring helium in air (about 5 ppm) to create a leak rate signal.