Title: Condition responsive valve construction and method of making the same

Abstract: A condition responsive valve construction having a housing provided with a valve seat. A pair of metallic balls are secured together in abutting relation and are movable toward and away from the valve seat so that one of the balls acts to open and close the valve seat. A lever is movably mounted in the housing and acts between the balls to cause movement thereof upon certain movement of the lever caused by a condition responsive means sensing different conditions. Spring means are provided for tending to hold the balls in the valve seat closed position thereof and in a certain valve seat open position thereof so that the lever can have lost motion travel between the balls for creating a differential in the conditions required to open and close the valve seat.

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Inventors: Kalinovski, Fred (King of Prussia, PA, US)

Application Number: 487908
Filing Date: 1974-07-12
Publication_date: 1976-03-16
Assignee: Robertshaw Controls Company (Richmond, VA)
Primary Class(es): 236/102 137/82, 236/87, 236/99G, 251/78
Other Classes:
US Patent Ref:

1491189	Apr, 1924	Birtch	236/102.
2757688	Aug, 1956	Klingler	251/78.
3104813	Sep, 1963	Baatrup	236/102.
3166247	Jan, 1965	Malone et al.	236/102.
3215162	Nov, 1965	Carver	137/625.
3237633	Mar, 1966	Sanville	137/82.
3297044	Jan, 1967	Thorburn	137/82.
3329393	Jul, 1967	Parks	251/78.
3580502	May, 1971	Duchek	137/82.

Other Refs:
Primary Examiner: Camby, John J.
Assistant Examiner: Yuen, Henry C.
Attorney: Candor, Candor & Tassone