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Noshok® 506-MFC standard needle valve is part of the 500 series family. It has a soft seat and blow-out proof stem. The stem design provides a secondary stem seal in the full open position, a replaceable Delrin seat, and straight through porting for bidirectional, high capacity flow and easy roddable cleaning. All stems are 316 stainless steel and all stem threads are rolled for strength and ease of operation. Other features for the 500 series valves include a one-piece bonnet with a metal-to-metal seal to the valve body below the bonnet threads and a slotted spring pin to prevent accidental loosening.