Platte River Equity announced the sale of its portfolio company PRV Metals LLC to Tinicum L.P., a New York-based private investment firm. Through its two operating subsidiaries, Sierra Alloys (Irwindale, Calif.) and TSI Titanium (Derry, Pa.), PRV Metals manufactures and supplies forged and rolled titanium, stainless steel products and other specialty alloys to the commercial aerospace, defense, medical, energy and industrial sectors. The company specializes in flat and round bar and plate products, and it performs in-house heat treating, hot rolling, forging, conditioning and machining.