Browse Prior Art Database

Self Actuating, Double Action Check Valve

IP.com Disclosure Number: IPCOM000093164D
Original Publication Date: 1967-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Wright, DM: AUTHOR

Abstract

Double-action check valve 10 comprises block member 11 with cylindrical spool chamber 12. The latter has a pair of spaced outlet ports 13 and 14 on one side and single inlet port 15 on the opposite side. Within chamber 12 is a cylindrical spool member capable of either closing port 13 with spool end 16 or closing port 14 with spool end 17. Feedback channel 18 within block 11 extends from the region of port 13 to the left wall of chamber 12. Second feedback channel 19 extends through block 11 from the vicinity of port 14 to the right wall of chamber 12.

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Self Actuating, Double Action Check Valve

Double-action check valve 10 comprises block member 11 with cylindrical spool chamber 12. The latter has a pair of spaced outlet ports 13 and 14 on one side and single inlet port 15 on the opposite side. Within chamber 12 is a cylindrical spool member capable of either closing port 13 with spool end 16 or closing port 14 with spool end 17. Feedback channel 18 within block 11 extends from the region of port 13 to the left wall of chamber 12. Second feedback channel 19 extends through block 11 from the vicinity of port 14 to the right wall of chamber 12.

When pump 20 is operating, there is a low pressure in inlet line 21 and a high pressure in outlet line 22 and through the entire system on line 23, load 24, and return line 25. The low pressure of line 21 also exists within valve 10 at port 13 and feedback channel 18 to the left side of chamber 12. Since pump 26 is not operating and a back pressure is applied through its outlet line 27 from the outlet of pump 20, a high pressure exists on inlet line 28 of pump 26 which is reflected into valve 10 within port 14 through feedback channel 19 to the right end of chamber 12. The pressure differential which exists on opposite ends of the spool valve causes spools 16 and 17 to be moved to the left to open port 15 through valve 10 to port 13 and to block port 14.

When pump 20 fails, a pressure switch circuit, not shown, senses the reduced outlet pressure of pump 20 and turns on pump...