Fluid pressure control device

• US 3,335,746 A
• Filed: 08/12/1964
• Issued: 08/15/1967
• Est. Priority Date: 08/12/1964
• Status: Expired due to Term

• Current Assignee: Ralph H. Lebow
• Original Assignee: Ralph H. Lebow
• Inventors: Lebow, Ralph H.
• Application Number:
  US04/389,075
• Time in Patent Office: 1,098 Days
• US Class Current: 137/389
• CPC Class Codes: F15B 1/26 Supply reservoir or sump assemblies
• CPC Class Codes: G01F 23/161 for discrete levels G01F23/162 - G01F23/165 take precedence
• CPC Class Codes: G05D 16/106 Sleeve-like sensing elements; Sensing elements surrounded by the flow path
• CPC Class Codes: G05D 16/166 using pistons within the main valve
• CPC Class Codes: G05D 16/187 using pistons within the main valve
• CPC Class Codes: G05D 9/04 with auxiliary non-electric power
• CPC Class Codes: Y10T 137/3367 Larner-Johnson type valves; i.e., telescoping internal valve in expanded flow line section
• CPC Class Codes: Y10T 137/7297 With second diverse control
• CPC Class Codes: Y10T 137/731 With control fluid connection at desired liquid level
• CPC Class Codes: Y10T 137/7766 Choked passage through main valve head
• CPC Class Codes: Y10T 137/8601 And pilot valve

Claims

1. A FLUID SYSTEM COMPRISING A TANK;

A PUMP HAVING AN INTAKE PORT IN COMMUNICATION WITH LIQUID IN SAID TANK AND A DISCHARGE PORT FOR DISCHARGE OF LIQUID UNDER PRESSURE THROUGH A DELIVERY CONDUIT CONNECTED AT ONE END TO SAID DISCHARGE PORT;

VALVE MEANS OPERATIVE IN RESPONSE TO VARIATION IN LIQUID PRESSURE ADJACENT THE DOWNSTREAM END OF SAID DELIVERY CONDUIT TO VARY THE RATE OF FLOW THROUGH SAID DELIVERY CONDUIT;

AND PUMP ANTI-CAVITATION MEANS OPERATIVE IN RESPONSE TO DECREASE OF THE LEVEL OF THE LIQUID TO A PREDETERMINED MINIMUM LEVEL TO CONDUCT LIQUID PRES-