SAFETY VALVE FOR OIL FILLED CABLE

• US 3,719,203 A
• Filed: 10/13/1971
• Issued: 03/06/1973
• Est. Priority Date: 10/13/1971
• Status: Expired due to Term

• Current Assignee: Alcatel SA (Nokia Corporation)
• Original Assignee: Gunnar Wettre
• Inventors: Wettre, Gunnar
• Primary Examiner(s): Klinksiek, Henry T.
• Application Number:
  US05/188,881
• Time in Patent Office: 510 Days
• Field of Search: 137/554,559 251/61.4
• US Class Current: 137/554
• CPC Class Codes: F16K 37/0033 using a permanent magnet, e.g. in combination with a reed relays
• CPC Class Codes: F16K 37/0041 for measuring valve parameters F16K37/0033 takes precedence
• CPC Class Codes: Y10T 137/8242 Electrical
• CPC Class Codes: Y10T 137/8359 Inspection means

Abstract

Oil pressure in oil filled cables is sensed and controlled by a valve arrangement which prevents damage to the oil pressure tank. Expansion or contraction of a pressure cell with the outflow or inflow of oil moves a piston against upper or lower valve seats to stop oil flow. A magnet on one end of the piston actuates upper and lower reed relays to set off a detector or alarm device at predetermined limits.

Claims

1. An oil pressure valve for oil filled cables comprising:

a container having a rigid outer wall, an inner flexible pressure cell having a moveable wall, and an oil chamber between said moveable inner cell wall and rigid outer wall, said moveable inner wall moving inwardly and outwardly in accordance with the volume of oil in said chamber;

a valve mounted in an opening through said outer wall to control the flow of oil;

an output pipe connected to said valve on said outer wall; and

actuating means connected between said cell wall and valve to close said valve upon a predetermined movement of said cell wall in accordance with said oil volume to stop the flow of oil between said oil chamber and output pipe.

2. The device of claim 1 wherein said valve includes a housing having a chamber with inner and outer openings at opposite ends, and said actuating means includes a movable shaft extending axially through said valve chamber and openings, a piston mounted on said shaft in said valve chamber, said valve chamber providing a passageway for oil around said piston and shaft, said output pipe being connected to said outer opening, and means for resiliently mounting said shaft against said movable inner cell wall, said shaft and piston being moved inwardly and outwardly within said valve chamber by said cell wall, said piston closing one of said inner and outer openings upon said predetermined movement of said cell wall.

3. The device of claim 2 wherein said piston is adapted to close said inner and outer openings respectively upon predetermined inward and outward movements of said cell wall.

4. The device of claim 3 including signal means for indicating the innermost and outermost positions of said shaft and piston.