National Oilwell 100SD6604 3 in GD PG-2B Discharge Valve Assembly

This is a new National Oilwell (NOV) discharge valve assembly, part number 100SD6604, cross-referenced on the original box label as 0040-AR-066A-04, designated "GD DISCH. VALVE ASSY PG-2B" — a guided-disc (GD) style spring-loaded poppet valve assembly designed for use in the PG-2B series triplex or duplex mud pump discharge valve seats. The assembly consists of a stainless steel body/retainer cup, a spring-loaded valve disc with a yellow elastomeric seal (visible in photos), a coil return spring, and a cast iron/steel yoke-style guide frame stamped "C-6," indicating a Class 6 or Group 6 designation typical of NOV pump valve classifications. The 3-inch nominal size refers to the valve bore/seat diameter, and the guided-disc configuration provides positive, concentric seating for reliable high-pressure shutoff in drilling fluid (mud) pump discharge service. The box is marked "VALVES LOOSELY ASSEMBLED," "MADE IN U.S.A.," and dated 05/02/05; the valve body shows the pen-marked lot/serial notation "0040-AR-04" and appears new/unused with no wear marks on the sealing surfaces. Compatible with National Oilwell PG-2B series pump fluid ends; buyers should confirm seat compatibility and elastomer grade (standard appears to be Nitrile/Buna-N based on yellow coloration) for their specific service fluid.

Product Specifications