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Simple Valve Control

Simple Valve Control. Purpose. The valve body and associated mechanisms are designed to control the fluid flow to the various clutch pistons and servos within the transmission The valve body must control the following fluid flow properties Timing (when does it flow) Rate (how much flows)

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Simple Valve Control

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  1. Simple Valve Control

  2. Purpose • The valve body and associated mechanisms are designed to control the fluid flow to the various clutch pistons and servos within the transmission • The valve body must control the following fluid flow properties • Timing (when does it flow) • Rate (how much flows) • Pressure

  3. Hydraulic Basics Apply Pin Pressure x Area = Force 90 PSI x 4.9 in2 = 441 pounds force • Pascal’s Law • Force = Area x Pressure • Area = Force ÷ Pressure • Pressure = Force ÷ Area Piston (2.5” diameter) (4.9 in2 area) Drum Line Pressure (90 PSI)

  4. Basic Hydraulics • Flow vs. Pressure when fluid is passing through an orifice Flow 90 PSI 27 PSI

  5. Basic Hydraulics • Flow vs. Pressure when fluid is passing through an orifice Increased Spring Pressure = Reduced Flow = Higher Apply pressure Reduced Flow 90 PSI 57 PSI

  6. Basic Hydraulics • Holding pressure No Flow = No Pressure Drop No Flow 90 PSI 90 PSI

  7. Basic Hydraulics • Holding Pressure Exhaust/Bleed creates flow Minimal Flow Creates small pressure drop Minimal Flow 90 PSI 70 PSI

  8. Basic Hydraulics • Servo Release Orifice creates a pressure drop = slow release Flow 0 PSI 30 PSI

  9. Basic Hydraulics Spacer Plate • Checkball use (Release) Checkball Flow 0 PSI 90 PSI

  10. Basic Hydraulics Spacer Plate • Checkball use (Apply) Checkball (Seals release passage) Flow 90 PSI 40 PSI

  11. Spool Valve Features Valleys Faces Lands

  12. Types of Valves • Balanced • Controls pressure • Pressure regulator • Governor • TV • Modulator • Unbalanced • Directs pressure • Shift valves • Sequencing • Positions another valve or prevents unwanted function • Reverse lockout (idiot valve) • Low control valve (TH-350)

  13. Balanced Valve • Forces on valve in opposite directions are balanced at a certain point • Used to modulate pressure Exhaust Line Pressure

  14. Balanced Valve

  15. Unbalanced Valve • During the operation of an unbalanced valve, the forces in one direction or the other will be greater • Shift valves 1-2 Shift Valve (i.e. Powerglide) Line Pressure Governor Pressure Modulator Pressure Passage to low band servo Passage to high clutch

  16. Simple Shift Circuit

  17. Unbalanced Valve

  18. Scheduling Valve • Scheduling valves are used to prevent unwanted actions from occurring • (i.e. shift to M1 @ 80 MPH) TH 350 Low Control Valve @ 20 MPH in D To 1-2 Shift Valve M1Oil Governor Oil 15 Pounds 10 PSI M1Oil 1 in2 Valve

  19. Scheduling Valve • Scheduling valves are used to prevent unwanted actions from occurring • (i.e. shift to M1 @ 80 MPH) TH 350 Low Control Valve @ 80 MPH in D To 1-2 Shift Valve M1Oil Governor Oil 40 PSI 15 Pounds M1Oil 1 in2 Valve

  20. Scheduling Valve • Scheduling valves are used to prevent unwanted actions from occurring • (i.e. shift to M1 @ 80 MPH) TH 350 Low Control Valve @ 80 MPH in M1 To 1-2 Shift Valve M1Oil (60 PSI) Governor Oil 15 Pounds 40 PSI M1Oil 1 in2 Valve

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