Bolted valve control element

A fluid flow control device, comprising:

• a valve body including an inlet, an outlet, and a gallery disposed between the inlet and the outlet;
• a cage mounted within the gallery and including a plurality of openings for allowing the passage of fluid through the cage and the gallery;
• a control element including a stem, a plug, and a fastener fixing the plug to the stem, the plug being slidably disposed within the cage for controlling the flow of fluid through the valve body,
• the stem comprising an elongated member with a first end and a second end, the first end extending out of the valve body for being operably coupled to an actuator, the second end including a fastener recess including a plurality of internal threads,
• the plug disposed adjacent to the second end of the stem, and
• the fastener including a threaded portion extending from the plug and engaging the plurality of internal threads of the fasten er recess;
• and
• an anti-rotation device disposed between the second end of the stem and the plug for preventing rotation of the stem relative to the plug and fastener,
• wherein the anti-rotation device comprises washer having a disc-shaped body and one or more tabs extending radially outwardly from the disc-shaped body, and the second end of the stem includes one or more flat surfaces each engaging a corresponding tab of the one or more tabs.

A control element for a fluid flow control device, the control element comprising:

• a stem comprising an elongated member with a first end and a second end, the first end adapted to be operably coupled to an actuator and the second end including a fastener recess including a plurality of internal threads;
• a plug disposed adjacent to the second end of the stem, the plug comprising a through-bore, a plug body, a compression cap, and a seal member, the compression cap disposed between the second end of the stem and the plug body, the seal member disposed between the compression cap and the plug body, the compression cap defining a first surface of the plug adjacent to the second end of the stem, and the plug body defining a second surface of the plug spaced from the second surface of the stem;
• a fastener including an elongated shank disposed through the through-bore in the plug and having a first end and a second end, the first end of the shank including a threaded portion engaging the plurality of internal threads in the fastener recess of the stem, the second end of the shank including a head disposed adjacent to the second surface of the plug, thereby compressing the seal member between the compression cap and the plug body;
• and
• an anti-rotation device disposed between the second end of the stem and the first surface of the plug for preventing rotation of the stem relative to the plug and fastener, wherein the anti-rotation device comprises washer having a circular body and one or more tabs extending radially outwardly from the circular body, and the second end of the stem includes one or more flat surfaces each engaging a corresponding tab of the one or more tabs.