this is a cast metal mounting block (or yoke adapter) used to attach a Foxboro instrument--such as a valve positioner, limit switch, or pressure transmitter--onto a valve actuator or process pipe. not certain of all uses
Breakdown of the Markings
The raised cast markings indicate the specific ASME/ANSI pipe sizes and flange pressure classes that this single block is engineered to fit, depending on how it is oriented:
4 CL 150: Fits a 4-inch pipe or valve assembly rated for Class 150.
2 1/2 - 2 CL 600: Fits 2-inch to 2½-inch assemblies rated for Class 600.
2 1/2 - 2 CL 300: Fits 2-inch to 2½-inch assemblies rated for Class 300.
Physical Features
Multi-Orientation Design: Measuring roughly 1.75 inches long with a central through-bore, the stepped or contoured ends allow the bracket to sit flush against different yoke leg widths or pipe/bonnet diameters corresponding to the three size/class combinations stamped on the side.
Material: Unpainted cast carbon steel or stainless steel, typical of heavy-duty industrial process instrumentation hardware built by Foxboro (now part of Schneider Electric).
Typical Applications
Valve Positioners: Commonly included in attachment kits for Foxboro pneumatic or smart valve positioners (like the SRD960, SRD991, or legacy 69TA series) to clamp onto a control valve yoke.
Transmitters / Flowmeters: Also used as a stand-off or saddle block in mounting kits for Foxboro differential pressure transmitters or vortex flowmeters (such as the 84 Series), where flange class dictates the spacing between bolts or manifold components.
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