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This class 125 Milwaukee Valve 2882-M series cast iron gate valve has cast bronze-mounted seat rings and bushings and flanged connections for bolting to pipe flanges. The cast iron construction and its bolted bonnet and solid wedge gate provide compressive strength and resistance to wear. The bronze-mounted seat rings equip it for high pressure applications and help reduce corrosion and erosion over time. The valve has a non-rising stem which stays fixed in place while the gate lifts and lowers, ideal for use in low clearance or underground spaces, and non-asbestos graphite packing helps prevent the valve’s stem from leaking. The maximum pressure of this class 125 valve is 200 pounds per square inch (gauge) (psig) for water, oil, and gas pressure (WOG) and 125 psig for steam working pressure (SWP). Class is a standard relating to tolerance, construction, dimension, and wall thickness, but it is not a direct measurement of maximum working pressure. The valve has flanged end connections on both ends for bolting the valve to pipe flanges. Mounted on top of the valve, a manually operated cast iron hand wheel activates the inside screw mechanism which lifts and lowers the gate to start and stop the flow between the connected pipes. The valve meets Manufacturers Standardization Society (MSS) SP-70 standards and American Society of Mechanical Engineers (ASME) B.16.1 standards for quality assurance, and it is appropriate for use in various plumbing and heating applications, including use in building service pipe systems.
Gate valves control flow in a piping system by lifting a gate out of the path of steam, fluids, or gases. They are designed to block or permit flow, as the vibrations and force of flow repeatedly striking a partly lowered gate can damage the gate and seats. To accommodate different flows and pressure requirements, gates come in four types: solid wedge (appropriate for almost all liquid service), flexible wedge (appropriate for steam service), split wedge (appropriate for normal temperature, non-condensing gas and liquid service, including corrosive service), and parallel disk (appropriate for high and low pressure applications). Hand wheels or levers activate the screw mechanism in the valve’s bonnet, which comes in various designs, to open and close the gate. Union bonnets are preferable for building service piping, threaded-in (or screw-in) bonnets work well for lighter-duty usage, and bolted body-bonnet connections are used primarily in iron multi-turn valves. Most gate valves have either a rising stem, which moves up and down with the gate, or a non-rising stem, which remains fixed in place. When closed, the gate and its seats form tight planar sealing surfaces, ideal for linear liquid flow. Gate valves are used in air, gas, liquid, and steam applications.
The Milwaukee Valve Company manufactures manual and actuated valves, controls, and control accessories. The company, founded in 1901, and headquartered in New Berlin, WI, meets International Organization for Standardization (ISO) 9001:2008 and 14001:2004 standards.
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