Fig. 7 Brake Application, Loss of Air In Primary System

Fig. 5 Normal Broke Application, Primary and Secondary Systems Charged

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL Fig. 6 Brake Application, Loss of Air in Secondary System Fig. 7 Brake Application, Loss of Air In Primary System 1Primary Reservoir 2Secondary Reservoir 3Inlet & Exhaust A 4Piston A 5Piston B 6Check Valve 7Exhaust 8Inlet & Exhaust B 9Spring Brake Control Valve 10Double Check Valve Brake Application with Loss of Air In Primary Sys- tom (Fig. 7) If air pressure in the primary reservoir should fall below approximately 379 kPa (55 psi), the pressure below piston "A" is insufficient to resist spring force above arid piston "A" moves into contact with valve "A". Initial contact between piston "A" and valve "A" closes the hollow exhaust passage of piston "A". Continued movement of piston opens the inlet valve "A". The secondary reservoir and spring brake control valve is protected from air pressure loss by action of check valve. When brake application is made through the brake valve, air delivered from the secondary system of the brake valve enters the inversion valve control port. Air enters control port, moves past the inlet of valve "A" and is conducted through a passage in the body to the underside of piston "B." The added force of air pressure below piston "B" moves up, opening the exhaust valve "B." When exhaust of valve "B" opens, air pressure trapped in the emergency section of the spring brake chamber is allowed to escape resulting in a brake application by emergency section. The amount of air pressure released from spring brake is proportional to the amount of air pressure delivered to the control port of the inversion valve by delivery of brake valve secondary system. Parking (Spring) Brake Application (Fig. 8) When both primary and secondary systems are charged with air and spring brake control valve is placed in "apply" or exhaust position, the inversion valve air supply and air pressure in the spring brake chambers will be exhausted. The single check valve in the inversion valve assists the exhaust of air from the spring brake by allowing air below piston "B" to flow back out the open exhaust of spring brake control valve. When air pressure below piston "B" has dropped enough, piston "B" moves down opening the inlet of valve "B" thus providing an additional exhaust passage for air exhausting through the inversion valve from spring brakes. Fig. 8 Parking Broke Application 1Primary Reservoir 2Secondary Reservoir 3Inlet & Exhaust A 4Piston A 5Piston B 6Check Valve 7Exhaust 8Inlet & Exhaust B 9Spring Brake Control Valve 10Double Check Valve CTS-4079 - CHAPTER VII - Page 5

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