The Series NXT3000 Gas Feed System is a family of vacuum-operated, solution-feed gas dispensing components including a vacuum regulator, meter assembly, and a selection of ejectors to meet customer needs for feeding chlorine, sulfur dioxide, ammonia or carbon dioxide gas. The Series NXT3000 is a versatile, high quality system that operates at sonic conditions, eliminating the need for regulating differential pressure across the rate control valve. Three capacity versions allow for maximum feed rates from 1 to 3000 PPD. Proven design, rugged construction, and the use of the best available materials ensures precise gas feeding, low maintenance and dependable operation for the life of the equipment.
The vacuum regulator mounts directly on a 150 lb. cylinder, a ton container, or on a wall manifold. When ton container or wall mounted, a liquid trap and heater are provided to prevent liquefied gas from reaching the regulator.
As required for the application, the meter assembly may be integrally mounted or remotely mounted for feed rates up to 500 PPD. Only one control valve (manual or automatic) may be installed in the system. The meter assemblies, for rates up to 500 PPD, are designed to permit ganging multiple meters for integral or wall mounting to multiple feed points. A maximum of five meter assemblies may be ganged together of various flow rates provided the actual maximum feed rate does not exceed the vacuum regulator capacity.
Several ejector choices are available for the Series NXT3000 system. The EJ100/200/500 ejectors can be used for general applications. These incorporate an O-ring and diaphragm type check valve. For more demanding applications – for on-off service, anti-siphon and high back pressure, up to 200 psig (1380 kPa), the EJ17 ejector can be used. In addition, a Chlor-A-Vac chemical induction unit can be used as the vacuum source for the system.
For applications requiring uninterrupted gas feed a built-in automatic changeover function is provided in every vacuum regulator. All that is required is two vacuum regulators. No separate changeover module or valve is required, but for complex vacuum changeover systems the Series NXT3000 vacuum regulators can be used with the Capital Controls series of automatic vacuum switchover modules.
Only one vacuum regulator is required to feed maximum capacities up to 500 PPD (chlorine). Maximum capacities for other gases are as follows: Sulfur Dioxide – same as chlorine; Ammonia – 250 PPD; Carbon Dioxide – 375 PPD. The maximum feed capacity is dependent on the gas source.