Patent ID: 7980530

Claim:
A control valve comprising: a valve body having an inlet, an outlet, and a flow passage extending between the inlet and the outlet; a valve stem extending from the valve body, the valve stem including a stepped down diameter forming an abutment; a packing box joined to the valve body and having a bore sized to receive the valve stem, the packing box having a main body and narrowed pair of arms, the pair of arms terminating in separate mounting flanges each having a mounting surface, each of the pair of arms narrowed relative to a size of the mounting surface and defining access openings between the arms; the bore including a first counterbore sized to receive valve packing in a position adjacent a portion of the valve stem; the bore including a threaded second counterbore; a packing nut having a central bore sized to receive the valve stem and having a threaded outer surface positioned to engage the second counterbore, the central bore including a reduced diameter portion sized to prevent the abutment from passing through the central bore, the packing nut including an adjustment surface positioned to face the first counterbore; an adjustment head carried by the packing nut, the adjustment head including a plurality of tool accepting lugs extending radially outward from the adjustment head, the tool accepting lugs being sized and shaped to fit within an aperture of a tool which engages an outer surface of the lugs; the mounting flanges of the packing box sized to extend past the adjustment head of the packing nut when the packing nut is threaded into the second counterbore; and the access openings sized to permit access to selected adjustment apertures to allow partial rotation of the adjustment head without interference between the adjustment tool and the mounting flanges; and, wherein the narrowed arms and the access openings are sized to permit the packing nut to rotate through an angular range greater than an angular distance between the mounting flanges and greater than an angular range achievable using a conventional wrench coupled to a hex-head packing nut; wherein at least one of the tool receiving lugs includes a tool-receiving aperture.