Hydraulic control valve

• US 3,081,787 A
• Filed: 07/13/1961
• Issued: 03/19/1963
• Est. Priority Date: 07/13/1961
• Status: Expired due to Term

• Current Assignee: John W. Meulendyk
• Original Assignee: John W. Meulendyk
• Inventors: Meulendyk, John W.
• Application Number:
  US04/123,725
• Time in Patent Office: 614 Days
• US Class Current: 137/83
• CPC Class Codes: F15B 13/0436 the pilot valves being of the steerable jet type
• CPC Class Codes: Y10T 137/2322 Jet control type
• CPC Class Codes: Y10T 137/2409 With counter-balancing pressure feedback to the modulating device
• CPC Class Codes: Y10T 137/86702 With internal flow passage

Claims

1. A VALVE COMPRISING A SPOOL HAVING A NULL POSITION, A SOURCE OF FLUID UNDER PRESSURE, MEANS IN SAID SPOOL FOR RECEIVING FLUID UNDER PRESSURE FROM SAID SOURCE, FLOW DIRECTING MEANS FOR RECEIVING FLUID UNDER PRESSURE FROM SAID MEANS IN SAID SPOOL, A FIRST RECEIVER AND A SECOND RECEIVER FOR SAID FLUID, SAID FLOW DIRECTING MEANS INCLUDING A DISCHARGE FOR DIRECTING FLUID UNDER PRESSURE INTO SAID FIRST AND SECOND RECEIVERS IN EQUAL FLOW QUANTITIES, MEANS FOR APPLYING THE FLUID UNDER PRESSURE FROM SAID FIRST AND SECOND RECEIVERS TO OPPOSITELY DISPOSED PORTIONS OF THE SPOOL TO MAINTAIN THE SPOOL IN NULL POSITION, MEANS FOR DISPLACING SAID FLOW DIRECTING MEANS FOR DIRECTING FLUID UNDER PRESSURE INTO SAID FIRST AND SECOND RECEIVERS IN UNEQUAL FLOW QUANTITIES TO DISPLACE THE SPOOL FROM ITS NULL POSITION TO A SECOND POSITION IN WHICH EQUAL FLOW QUANTITIES OF FLUID UNDER PRESSURE ARE DELIVERED TO SAID FIRST AND SECOND RECEIVERS FROM THE DISPLACED FLOW DIRECTING MEANS TO MAINTAIN THE SPOOL IN SAID SECOND POSITION.