Valve stem packing assembly

In an arrangement for preventing sliding rotation directly against one end of a packing surrounding a valve stem in a stem passage of a valve body:

• a packing support ring engaging said one end of said packing;
• a gland engaging said support ring;
• a pair of reversely positioned spring washers, the outer periphery of one said washer engaging said gland and the outer periphery of the other of said washers engaging a nut threaded on said stem;
• and, said stem and said spring washers having cooperating means for preventing relative rotation between said stem and said washers.

A packing arrangement for a valve stem comprising:

• a valve body having a stem passage rotatably receiving a valve stem;
• packing means surrounding said stem within said passage for sealing said passage against leakage of fluid therethrough;
• force applying means cooperating with said stem for axially compressing said packing and expanding said packing radially into sealing engagement with said passage and stem;
• said stem being rotatable relative to said packing for moving a valve between open and closed positions and said force applying means being rotatable with said stem;
• and,
• controlled slippage means interposed between said force applying means and said packing for providing rotation of said force applying means relative to said packing without sliding rotation of any part directly against said packing, said controlled slippage means including a packing support ring engaging said packing and having gripping means thereon for preventing relative sliding rotation between said packing and support ring, and a gland interposed between said force applying means and said support ring wherein said gland is rotatable with said stem and force applying means relative to said support ring.

A packing arrangement for a valve stem comprising:

• a valve body having a stem passage rotatably receiving a valve stem;
• packing means surrounding said stem within said passage for sealing said passage against leakage of fluid therethrough;
• force applying means including a nut received on said stem and a pair of spring washers interposed between said nut and a controlled slippage means for axially compressing and radially expanding said packing into sealing engagement with said passage and stem, said spring washers having central holes therethrough receiving said stem with said holes and stem being cooperatively shaped for preventing relative rotation therebetween;
• said stem being rotatable relative to said packing for moving a valve between open and closed positions and said force applying means being rotatable with said stem;
• and,
• said controlled slippage means interposed between said force applying means and said packing for providing rotation of said force applying means relative to said packing without sliding rotation of any part directly against said packing.

A packing arrangement for a valve stem comprising:

• a valve body having a stem passage rotatably receiving a valve stem;
• packing means surrounding said stem within said passage for sealing said passage against leakage of fluid therethrough;
• force applying means cooperating with said stem for axially compressing said packing and expanding said packing radially into sealing engagement with said passage and stem;
• said stem being rotatable relative to said packing for moving a valve between open and closed positions and said force applying means being rotatable with said stem;
• and,
• controlled slippage means interposed between said force applying means and said packing for providing rotation of said force applying means relative to said packing without sliding rotation of any part directly against said packing, said controlled slippage means including a packing support ring having a chevron surface engaging said packing for radially expanding same and said chevron surface having notches therein gripping said packing for preventing relative sliding rotation between said packing and said support ring.

A packing arrangement for a valve stem comprising:

• a valve body having a stem passage rotatably receiving a valve stem;
• packing means comprised of a flexible carboneaceous material surrounding said stem within said passage for sealing said passage against leakage of fluid therethrough;
• force applying means cooperating with said stem for axially compressing said packing and expanding said packing radially into sealing engagement with said passage and stem;
• support rings disposed against opposed axial ends of said packing, said support rings being comprised of polyimide plastic material and having chevron surfaces engaging said packing for expanding same radially, the one of said support rings located at the end of said packing adjacent said force applying means having notches in the chevron surface thereof engaging said packing;
• said stem being rotatable relative to said packing for moving a valve between open and closed positions and said force applying means being rotatable with said stem;
• and,
• controlled slippage means including one of said support rings interposed between said force applying means and said packing for providing rotation of said force applying means relative to said packing without sliding rotation of any part directly against said packing.