This is a Matheson Single Stage 316 Stainless Steel regulator with a 1/4 inch MNPT outlet connection and 1/4 inch FNPT body porting. It comes equipped with 2 inch inlet and delivery pressure gauges, an outlet needle valve, Teflon & Viton seals and a Nickel plated brass bonnet.

This Matheson series 3040SV model 3040SV regulator is to be used in applications requiring delivery pressures up to 2500 PSIG and can accept a maximum inlet pressure of 3000 PSIG. This regulator is suitable for applications requiring the delivery of gas to manufacturing processes, charging of systems, and purging. This regulator's Viton and Teflon seals are good for most gasses including hydrogen chloride mixtures, however, if the application requires hydrogen sulfide a model using EPR and Vespel seals will be necessary

Single-Stage vs. Two-Stage

Both single-stage and two-stage regulators operate by reducing the pressure of gas supplied by a cylinder to an appropriate output level. The intake and delivery pressure ranges of regulators do not depend on how many stages they have, but by each regulators mechanical characteristics. When considering a single vs. a two-stage regulator there are two things to keep in mind: Droop and Supply Pressure Effect. Droop is the decrease in output pressure caused by an increase in flow rate. Supply Pressure Effect is simply the variation in delivery pressure from the cylinder to the regulator.

Single Stage regulators will experience less droop with varying flow rates but a large supply pressure effect and need to be monitored and adjusted by an operator or used in applications where supply pressure will remain constant. Two-Stage regulators inherently control for variations in supply pressure while producing a constant output and therefore can be used without an operator present and in applications which require a very specific delivery pressure. The specification sheet for this series of regulator can be found in the downloadable section as a .PDF.