초록 ▼

A valve plug design is disclosed that uses a plug head band and a retaining ring to restrain a valve plug head to a valve plug stem. This invention is specifically directed to providing valve plugs where the plug head material is different and distinct from the plug stem material and where each mate

A valve plug design is disclosed that uses a plug head band and a retaining ring to restrain a valve plug head to a valve plug stem. This invention is specifically directed to providing valve plugs where the plug head material is different and distinct from the plug stem material and where each material is selected to optimize its performance. Moreover, this invention is provided with a means for fixing and removing the plug head to and from the plug stem that can easily be worked in the field without special purpose manufacturing equipment, thereby making the maintenance, repair and replacement of plug head easier for users. This valve plug design subjects the plug head to reduced stresses thereby enhances the operating life of the valve and valve plug. This valve plug design provides a shock absorbing, compliance barrier around and/or under the plug head. This invention also provides a more uniform and broadened contact surface between the plug head and the plug stem, further reducing mechanical stresses to the plug head. This plug head invention requires less material and thus leads to reduced manufacturing costs and does not require welding to fasten the plug head to the plug stem, thereby permitting heat treatments as required without adverse impacts to the plug head to plug stem joint. Also, this invention is adapted to function in cooperation sensors embedded at the plug head—valve plug stem interface to permit the monitoring of alignment stresses on the valve plug head.

대표청구항 ▼

1. A valve plug head assembly comprising:(A) a means for holding a valve plug head to a valve plug stem, having a plug stem base and a plug stem base cavity, wherein said means for holding further comprises a plug head band, fitted between said valve plug head and a recess in a side wall of said plu

1. A valve plug head assembly comprising:(A) a means for holding a valve plug head to a valve plug stem, having a plug stem base and a plug stem base cavity, wherein said means for holding further comprises a plug head band, fitted between said valve plug head and a recess in a side wall of said plug stem base cavity, said plug head band having a first side and a second side and having said second side fitted inside said recess in said plug stem base cavity; and a band retainer fitted over said plug head band; said valve plug head having a generally flat surface extending across and located in said plug stem base cavity and held in contact by said means for holding with said plug stem base and said plug head having a general convex surface extending outward from said plug stem base and said plug stem base cavity to thereby provide a means for said valve plug bead to entirely close off a flow path through a valve assembly, and(B) a means for fastening said means for holding to said valve plug stems wherein said means for fastening further comprises a means selected from the group consisting of a bolt, a pin, a screw, a weld, a braze, and a clamp. 2. A valve plug head assembly, as recited in claim 1, wherein said first side of said plug head band is greater in height than said second side of said plug head band. 3. A valve plug head assembly, as recited in claim 1, wherein said plug head is further comprised of a material selected from the group consisting of structural ceramics, cermets, cast irons, silicon irons, white irons, martensitic steels, and CrCoFe alloys. 4. A valve plug head assembly, as recited in claim 1, wherein said plug head band of said means for holding further is in contact with said valve plug head and said valve plug stem and wherein said plug head band is composed of a ductile material selected from the group consisting of titanium and its alloys, zirconium and its alloys, niobium and its alloys, titanium-niobium alloys, alloy steels, carbon steels, iron-base superalloys, stainless steels, nickel and its alloys, nickel-base superalloys, copper based alloys, cobalt alloys, cobalt-base superalloys, aluminum and its alloys, magnesium alloys, and tantalum. 5. A valve plug head assembly, as recited in claim 1, wherein said band is composed of a first material and said plug head is composed of a second material and where said first material is different from said second material.