0781-3564 - Victor VTS252D-350 Two-Stage Methane/Hydrogen Regulator

Victor VTS252D-350 Technical Overview

The Victor VTS252D-350 (SKU: 0781-3564) is a precision-engineered two-stage regulator designed specifically for medium-duty applications involving Methane and Hydrogen gases. Part of the renowned VTS 250 Series, this unit is engineered to provide a constant delivery pressure over a wide range of decreasing inlet pressures, a critical requirement for analytical, testing, and precise industrial processes where pressure fluctuation can compromise results.

Technically, the regulator operates by reducing the high-pressure cylinder gas to an intermediate pressure in the first stage, and then to the final working pressure in the second stage. This dual-reduction mechanism isolates the final delivery pressure from the 'supply pressure effect' common in single-stage regulators. The unit features a maximum inlet pressure rating of 3000 PSIG and offers a delivery range of 5 to 125 PSIG. The flow coefficient (Cv) is rated at 0.082, ensuring adequate flow for medium-duty tasks.

Construction-wise, the VTS252D-350 is built for longevity and safety. It utilizes a die-forged brass body and a brass spring housing cap, providing superior strength compared to cast alternatives. The diaphragm system employs fabric-reinforced neoprene (1.3-inch and 1.75-inch sizes), which offers a balance of sensitivity and durability. The seat mechanism is a stem-type design that aids in positive sealing, while an electroless nickel-plated bronze sintered inlet filter prevents particulate contamination. Additional engineering features include a Delrin insert bushing for durability and a stainless steel ball in the key for smooth, low-torque adjustment. The unit connects via a standard CGA 350 inlet and a 9/16"-18 LH(M) outlet.