Schrader 1521W Valve

Schrader 1521W Valve is an accelerator valve identified by OLD NUMBER 1521W and MODEL 01521-0439. Documented in a Perkins Tier II engine parts manual, this valve is described as an accelerator valve with a 3/8-inch port size and a flow capacity of 170 SCFM. The 1521W designation, paired with the 01521-0439 model number, provides a precise cross-reference for sourcing exact replacements in catalogs and service kits for legacy Perkins installations. These specifications—3/8" port and 170 SCFM flow—define the valve’s size and performance characteristics within compatible hydraulic or pneumatic control systems. By aligning the old number with the current model, technicians can confidently identify the correct Schrader valve when performing rebuilds or maintenance on equipment that relies on this specific component.