0781-0095 - Victor SR261B-510 Medium Duty LP Gas Regulator, 2-40 PSIG

Technical Overview of the Victor SR261B-510 Regulator

The Victor SR261B-510 (SKU: 0781-0095) is a single-stage, medium-duty regulator engineered specifically for Liquefied Petroleum Gas (LPG) applications. Part of the renowned SR 250 Series, this unit is designed to manage inlet pressures up to 350 PSIG while providing a stable delivery pressure range of 2 to 40 PSIG. The regulator utilizes a CGA 510 inlet connection, the industry standard for propane and similar fuel gases, ensuring broad compatibility with industrial cylinders.

Structurally, the SR261B-510 is built for longevity and reliability. It features a die-forged brass body and housing cap, offering superior strength compared to cast alternatives. The internal mechanism is centered around a stem-type seat and a 1.75-inch diaphragm made from fabric-reinforced neoprene. This diaphragm composition is critical for maintaining flexibility and responsiveness over a wide temperature range, ensuring consistent flow rates even as cylinder pressure fluctuates. The flow coefficient (Cv) of 0.109 indicates its capability to handle medium-capacity flow requirements suitable for cutting, heating, and brazing operations.

Safety and maintenance are key components of the design. The regulator includes an external self-reseating relief valve, which provides a layer of protection against over-pressurization within the regulator body (though it does not replace downstream safety devices). Contamination is managed via an electroless nickel-plated bronze sintered inlet filter, which prevents particulate matter from damaging the seat mechanism. For operational ease, the adjusting screw is paired with a Delrin insert bushing and a stainless steel ball in the key, drastically reducing friction and allowing for precise, smooth pressure settings.

This model is ideal for applications where slight delivery pressure increases due to the "decay" effect of decreasing cylinder pressure are acceptable. It is a robust solution for professionals requiring a dedicated LP gas regulator that adheres to Victor's high standards of manufacturing quality.