0781-0027 - Victor SR 250 Series Medium Duty Oxygen Regulator CGA-540

Victor SR250C-540 Single Stage Oxygen Regulator

The Victor SR250C-540 (0781-0027) is a robust single-stage regulator engineered for medium-duty industrial applications. Part of the renowned SR 250 Series, this regulator is designed to manage oxygen delivery with precision and reliability. It features a delivery pressure range of 4 to 80 PSIG, making it suitable for a wide variety of cutting, heating, and welding tasks where consistent flow control is required. The unit is constructed with a die-forged brass body and a die-forged brass spring housing cap, providing exceptional strength and resistance to wear in demanding shop environments.

Internally, the regulator utilizes a stem-type seat mechanism that assists in effective sealing, coupled with a 1.75-inch fabric-reinforced neoprene diaphragm that ensures accurate and long-lasting service. The flow coefficient (Cv) of 0.109 indicates its capability to handle medium to high capacity flows efficiently. To protect the internal components, the regulator includes a sintered inlet filter made from electroless nickel-plated bronze, which traps particulates and extends the lifespan of the seat assembly. Safety is paramount in the design, evidenced by the inclusion of an external self-reseating relief valve (note: not designed to protect downstream equipment, but to relieve excess regulator pressure).

Operational ease is enhanced by the brass adjusting screw with a forged T-handle, which incorporates a Delrin insert bushing and a stainless steel ball in the key. This combination reduces friction, allowing for smooth and precise pressure adjustments. The regulator is equipped with two 2-inch brass gauges—one measuring inlet pressure up to 4000 PSIG and the other measuring delivery pressure up to 100 PSIG—providing clear visual feedback to the operator. With a maximum inlet pressure rating of 3000 PSIG and a standard CGA-540 connection, the SR250C-540 is a versatile and dependable choice for professionals requiring quality gas control.