Figure 1A - Manual Opening

Safety Precautions - TM-55-1930-209-14P-17_1065

TM-55-1930-209-14P-17 Water Purification Barges (NSN 1930-01-234-2165) Miscellaneous Equipment Dayroom Workshop Access and Sanitation Systems Manual
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MSA Pressure Demand Exhalation Valves part numbers 461613 and 461860 Refer to the illustrated parts list for the apparatus CLEANING INSTRUCTIONS General: Moisture in the breath, saliva, dust collected in the mask, and perspiration adhering to the valve create a bonding effect on the valve, which may cause it to stick on the first exhaled breath. Two styles of valves exist which require different attention to this problem (See Figures 1A and 1B for pictorial differences). Style A in Figure 1A can be manually opened should it stick during storage. Press on the center pin until it is flush with the guide hole. The following procedures are recommended for cleaning. A leaking valve probably only needs cleaned. After Each Use: After washing and rinsing the facepiece, the valve in Style A must be held open (See Figure 1A) and flushed with rinse water. Style B does not have this feature. Before the facepiece is stored, the valve must be forced air dried as described in Step #8. The purpose of this procedure is to insure the valve is stored in a dry condition. Periodic Cleaning: 1. Remove the valve from the Ultravue' facepiece by unscrewing the nut, Part Number 461610, inside the facepiece with the special wrench supplied with the apparatus. Remove the valve from the Clearvue® facepiece by removing the clamp, Part Number 57909. CAUTION: When performing the next step do not stretch or deform the spring which is inside the valve. Handle the seat spring and valve stem assembly carefully. DO NOT scratch or nick the valve seats. 2. Disassemble the valve by removing the four screws shown in figures 1B and 2 with the proper size screwdriver. over ä Figure 1A - Manual Opening Figure 1B - Removing Screws Figure 2A - Disassembled Valve

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