Fig. 1 Cross Sectional View of One- Way Check Valve

Fig. 12 Sectional View of Reservoir Automatic Drain Valve

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 ONE WAY CHECK VALVE DESCRIPTION The one-way check valves (Fig. 1 and 2) are used to permit passage of air pressure through the valve in one direction only as indicated by the arrow on the side of the valve. They are installed in both primary and secondary reservoirs to maintain the air supply in both reservoirs if an air loss should occur ahead of the valve. Fig. 1 Cross Sectional View of One- Way Check Valve 1BODY, Valve 4WASHER, Cap-to-Body 2SPRING 5CAP, Valve 3SEAL, Assembly The 900 angle check valve shown in Fig. 2 is used in applications where clearance conditions exist on various chassis. OPERATION Air flow in direction of arrow moves the seal from its seat and the air flow is unobstructed. Flow in reverse direction is prevented by seating of the seal by the upstream air pressure and assistance of spring. MAINTENANCE Once each year or every 160,000 km (100,000 miles) check operation (see SERVICE CHECKS). SERVICE CHECKS Depending upon installation, it may be easier or necessary to completely remove check valve so that the following checks may be made. If checking valves at primary and secondary reservoirs, bleed air supply reservoir and disconnect air inlet to valve and proceed as follows. Fig. 2 90^o Angle Check Valve 1Body 4Valve 2"0" Ring 5Spring 3Cap CAUTION Be sure to set parking brake or block wheels to prevent vehicle from moving. With air pressure present at outlet side of check valve and inlet open to atmosphere, use leak detector tester to test for leakage. Leakage should not exceed 25.4 mm (1 in.) soap bubble in 5 seconds, slight leakage is permitted. However, if valve leaks excessively, the valve should be repaired or replaced. REMOVE 1. Apply parking brake or block wheels to prevent vehicle from moving. 2. Drain all air reservoirs. 3. Disconnect air lines and remove check valve. REINSTALL 1. Check and, if required, clean or replace air line to valve. 2. Install valve making certain that it is installed correctly. Arrow on outside of body indicates direction of air flow through valve. 3. Check valve for leakage. CTS -4079-CHAPTER III PRINTED IN UNTIED STATES OF AMERICA Page 3

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