(under subclass 213) Devices wherein the valve stem and/or actuator is particularly associated with means to pack or seal it to prevent leakage of fluid between the inside and outside of the valve body (e.g., as where the actuating screw threads are enveloped by the packing).
SEE OR SEARCH CLASS
277, Seal for a Joint or Juncture, for a generic sealing means or process,
500+, for a dynamic, circumferential, contact seal for other than a piston.
