Title: Lubricant pressure relief valve for earth penetrating tools

Abstract: Disclosed herein for use with earth penetrating tools is an improved lubricant pressure relief system that utilizes a housing adapted for retention within a lubricant containing passage. An interior surface or opening of the housing is exposed to the lubricant in the passage and includes an outlet port which has an elastic pressure responsive valve covering the opening. The valve releases lubricant when a selected pressure is exceeded while excluding the entrance of exterior matter. The valve functions as a secondary pressure relief valve when used in combination with a spring biased pressure relief valve located within the opening of the housing, which is thereby protected from exterior matter and its successful operation assured.

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Inventors: Millsapps, Jr., Stuart C. (Houston, TX, US)

Application Number: 466641
Filing Date: 1974-05-03
Publication_date: 1976-03-09
Assignee: Hughes Tool Company (Houston, TX)
Primary Class(es): 175/227 137/512.3, 184/45.1
Other Classes:
US Patent Ref:

1865231	Jun, 1932	Buck	137/223.
2088788	Aug, 1937	Hage	137/525.
2306012	Dec, 1942	Campbell	137/512.
2630326	Mar, 1953	Bryant	137/525.
3298394	Jan, 1967	Chorkey	137/516.
3363644	Jan, 1968	Malec	137/516.
3384113	May, 1968	Pennisi	137/525.
3459217	Aug, 1969	Callahan	137/516.
3476195	Nov, 1969	Galle	175/228.
3511271	May, 1970	Pollinger et al.	137/512.

Other Refs: 541,231

May, 1957	CA

Primary Examiner: Pinkham, Richard C.
Assistant Examiner: Kramer, Arnold W.
Attorney: Felsman; Robert A.