Back to results
US 6,659,757 B2Granted
Valve for injection molding
AssigneeTrexel, Inc.
InventorsRoland Y. Kim, Theodore A. Burnham
Life of this patent
Estimating the term…
Abstract
A valve for controlling the flow of a high pressure fluid is provided. The valve provides a reliable way of controlling the flow of high pressure fluids in applications requiring multiple cycles where equipment may be exposed to environmentally harsh conditions, such as high temperatures and pressures.
Claims15
A valve comprising:
- a valve seat;
- a valve pin capable of forming a fluid-tight seal with the valve seat;
- a valve pin guide adjacent the valve seat, the valve pin guide having an internal diameter that is substantially the same as the outer diameter of the valve pin;
- a packing washer supporting the valve pin, the packing washer having a first end and a second end, wherein an internal diameter of the packing washer varies between the first end and the second end;
- and
- a piston stem having first and second ends and configured to transfer axial force to the valve pin, the piston stem being uncoupled from the valve pin.
3 more elements
A polymer processing system comprising:
- an extruder including a barrel and a screw rotatable within the barrel, the barrel having a blowing agent port former therein;
- and
- a valve positioned between a blowing agent source and the blowing agent port, the valve comprising a valve seat, a valve pin capable of forming a fluid-tight seal with the valve seat, a valve pin guide adjacent the valve seat, the valve pin guide having an internal diameter that is substantially the same as the outer diameter of the valve pin, a packing washer supporting the valve pin, the packing washer having a first end and a second end, wherein an internal diameter of the packing washer varies between the first end and the second end, and a piston stem having first and second ends and configured to transfer axial force to the valve pin, the piston stem being uncoupled from the valve pin.
Dependencies are inferred from the claim text.