Metering & Bellow ValvesA valve is a device that regulates, directs or controls the flow of a fluid by opening, closing, or partially obstructing various passageways. Valves are technically valves fittings, but are usually discussed as a separate category. VMVM 1D, 3D, 6D and VMH SeriesVM 1D, 3D, and 6D Series Catalog 2D / 3D Spec. Working Pressure : 2,000 psig for VM1D Series 1,000 psig for VM3D / VM6D Series Stainless Steel and Brass DK-Lok 1/16 to 3/8 in. OD Pipe thread 1/8 to 1/4 in. Panel mount with no handle removaBrief Description Slotted handle : allows flow setting adjustment with a screwdriver. Lock screw : locks out flow setting. Handle stop : mechanically helps prevent damage to stem and orifice. Stem O-ring : seals system fluids Tapered stem tip : controls gas or liquid flow rates accurately.