112-0002 - Miller Smith Silverline CO2 Regulator 100 PSI Single Stage

Technical Overview: Miller Smith 112-00-02

The Miller Smith 112-00-02 is a single-stage, general-purpose pressure regulator from the 110 Silverline Series, specifically configured for Carbon Dioxide (CO2) service via a CGA 320 inlet connection. This regulator is designed for applications requiring delivery pressures up to 100 PSIG from high-pressure sources up to 3500 PSIG. It is categorized as a general-purpose device, suitable for inert and non-corrosive gas applications where the ultra-high precision of a two-stage regulator is not required, and where minor outlet pressure decay (droop) is acceptable as the cylinder pressure falls.

Construction and Internal Mechanics
The core of the 112-00-02 is its brass bar stock body, which offers superior density and thread strength compared to forged alternatives. The internal flow control is governed by a 1-7/8 inch diaphragm, which provides adequate sensitivity for setting and maintaining downstream pressure. The regulator employs Miller's proprietary Sure-Seat technology. This filtered seat assembly is critical for CO2 applications, where dry ice formation or particulate contamination can often compromise the seat seal. The filter prevents foreign matter from embedding in the seat, preventing creep and ensuring positive shut-off.

Performance Characteristics
This model is rated for a delivery range of 0-100 PSIG. While the manufacturer's general series description mentions ranges up to 200 PSIG, the 112-00-02 variant is specifically tuned for the 100 PSIG ceiling, indicated by the delivery gauge scaling. The unit is not recommended for analytical applications requiring low inboard diffusion or for systems sensitive to elastomeric outgassing. However, for standard shielding gas delivery, pneumatic tool operation, or purging applications, it provides robust and repeatable performance. The body includes tapping for rear panel mounting, facilitating installation in gas manifolds or fixed station consoles.

Maintenance and Compatibility
The plated finish on the body and bonnet provides resistance to atmospheric corrosion. The 2-1/2 inch gauges are single-scale and housed in plated cases for protection. Operators should note that while the Silverline series supports various inert gases (Argon, Nitrogen, Helium), this specific SKU is fitted with CGA 320 for CO2. Conversion to other gases would require changing the inlet stem and nut to the appropriate CGA standard (e.g., CGA 580 for Argon), provided the internal materials are compatible with the intended service.