US2010170093A1PendingUtilityA1

Method for enhancing surface smoothness of ball valve stem

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Assignee: TAIWAN DALI AURORA ENTPR CO LTPriority: Jan 8, 2009Filed: Jan 8, 2009Published: Jul 8, 2010
Est. expiryJan 8, 2029(~2.5 yrs left)· nominal 20-yr term from priority
Inventors:Chun-Hung Lai
B21H 1/18B23P 9/02Y10T29/4941F16K 5/0647
47
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Claims

Abstract

A method for enhancing surface smoothness of a ball valve stem comprises contacting and pressing a surface of the ball valve stem with a pressing roller so as to even tool marks on the surface of the ball valve stem, thereby enhancing surface smoothness of the ball valve stem.

Claims

exact text as granted — not AI-modified
1 . A method for enhancing surface smoothness of a ball valve stem comprises steps of:
 positioning the ball valve stem at a predetermined position while allowing the ball valve stem to axially rotate;   contacting a surface of the ball valve stem with at least one axially rotatable pressing roller and driving the pressing roller to axially rotate; and   pressing the rotating pressing roller against the surface of the ball valve stem to even and smoothen the surface of the ball valve stem.   
     
     
         2 . The method of  claim 1 , wherein the pressing roller moves toward the ball valve stem and presses the ball valve stem. 
     
     
         3 . The method of  claim 1 , further comprising a step of contacting the surface of the ball valve stem with another rotatable pressing roller so that the two pressing rollers cooperatively press the surface of the ball valve stem.

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