The proven Zacks Rank system focuses on earnings estimates and estimate revisions to find winning stocks. Nevertheless, we know that our readers all have their own perspectives, so we are always looking at the latest trends in value, growth, and momentum to find strong picks.

Looking at the history of these trends, perhaps none is more beloved than value investing. This strategy simply looks to identify companies that are being undervalued by the broader market. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.

Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.

One company value investors might notice is Archrock Inc. (AROC Quick QuoteAROC - Free Report) . AROC is currently holding a Zacks Rank of #2 (Buy) and a Value grade of A. The stock has a Forward P/E ratio of 15.83. This compares to its industry's average Forward P/E of 17.04. Over the past year, AROC's Forward P/E has been as high as 166.63 and as low as -45.86, with a median of 36.23.

Finally, our model also underscores that AROC has a P/CF ratio of 4.27. This figure highlights a company's operating cash flow and can be used to find firms that are undervalued when considering their impressive cash outlook. AROC's current P/CF looks attractive when compared to its industry's average P/CF of 13.34. Over the past 52 weeks, AROC's P/CF has been as high as 6.57 and as low as 2.61, with a median of 4.38.

These are only a few of the key metrics included in Archrock Inc.'s strong Value grade, but they help show that the stock is likely undervalued right now. When factoring in the strength of its earnings outlook, AROC looks like an impressive value stock at the moment.