EXPLANATION OF PILOT VALVE

Figure 7 - Replacement Parts Illustration, Model 3Z183 only.

TM-55-1930-209-14P-7 Water Purification Barges (NSN 1930-01-234-2165) Drinking Water System Manual
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EXPLANATION OF PILOT VALVE Figure 8 - Pilot Valve (Ref. No. 17, page 7) NOTE: Pilot valve (Z-180) pressure range is 140 to 170 psi. Optional Pilot Valves Part No. Pressure Range Z-180A 120-140 psi Z-180B 80-100 psi Z-180C 35- 40 psi The Pilot Valve is designed to act as an automatic "on" and "off" air switch. When in the "on'” position, it allows air to flow from the tank thru the tube to some device such as a compressor head unloader mechanism, thus actuating it. In the "off" position, this valve stops the flow of air thru the valve and releases the pressure in the line to the device. The pilot Valve works as follows: Tank air pressure acts on the bottom of the valve. When pressure is great enough to overcome spring force holding valve down on lower seat, it lifts off seat and allows air to flow around valve and out through side opening in Pilot Valve. When valve lifts off lower seat it moves up and seats on upper seat where it is held by tank air pressure. When pressure in tank and on valve drops, spring forces valve back down on lower seat. Air in line to device being actuated can then escape through upper seat and out vent hole. The pressure at which the Pilot Valve is "on" or "off" is controlled by the spring, which has been installed at the factory. A small adjustment can be made in the field by changing the spring force by compressing the spring more or less with the adjusting screw provided on the Pilot Valve. ADJUSTING PRESSURE The unload pressure is adjusted by turning the pressure adjusting nut #1 clockwise to increase, and counter- clockwise to decrease, pressure. Changing the differential (difference there is between load and unload pressure) is accomplished by holding the lock nut closest to the body of the valve #2 so it does not move, then turning the large nut #3 next to it very slightly clockwise to increase the differential, and counter-clockwise to decrease it. IMPORTANT: REFER TO OPERATING MANUAL & SERVICE GUIDE, FORM 5S1408, FOR COMPREHENSIVE AIR COMPRESSOR INSTRUCTIONS.

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