Dekker VMAX SERIES Installation, Operation & Maintenance Manual
Also see for VMAX LT SERIES: Installation, operation & maintenance manual
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DEKKER Vacuum Technologies, Inc. / Part No. 9983-0000-S01 Rev. A 22Oil Solenoid ValveThe oil solenoid valve, if equipped, is located in seal fluid piping near the pump. The valve prevents oil fromfilling the pump on shutdown. It is critical that this valve operates properly. If the valve malfunctions in an openposition, oil will flow back into the pump when the system is shut off. This will result in hard starting andpossible equipment damage.If the valve is stuck in the closed position, poor vacuum performance will result. If the pump is operated forlonger than a minute without oil, internal damage may occur. The condition of the solenoid valve interior willmirror the condition of the oil reservoir housing. If there is a buildup of sludge, varnish, or particulate in the oilreservoir, the solenoid valve body may be likewise contaminated.Seal Fluid StrainerAfter the first 50 hours of operation, clean the strainer in the seal fluid line. This is done to remove any debriscarried over into the system from the process. Clean and inspect the strainer every 1000-3000 hoursdepending on application or if excessive oil discharge temperature (above 185°F) is indicated. An increase inpump discharge oil temperature is an indication of low oil flow and normally is an indication of strainerblockage. If cleaning of strainer does not decrease temperature check the seal fluid line for blockage.Separator ElementThe separator element(s) is located in the separator reservoir. The purpose of the separator element is toremove the oil from the discharge air. Replace the element every 10,000 hours or once a year. Earlierreplacement may be necessary when the back pressure is higher than 4 psig. High back pressure could be aresult of contaminates on the separator element due to oil varnish or contaminated inlet gas stream.Replacement may vary depending on application.NOTE: Thread-in style filters are installed hand-tight. Do not over-tighten with a wrench.Separator Element Oil Return LineThe separator element oil return lines are 1/8” to 3/8” transparent tubing. The purpose of these lines is toremove excessive oil build-up from inside the separator and separator element. If excessive smoking or oil mistis present check the oil return lines for blockage and replace if necessary. Also check that the steel section ofoil return line located on top of the separator reservoir is cut at a 45° angle and is touching the bottom of theseparator element.Shaft SealsAll DEKKER oil-sealed liquid ring vacuum pumps are fitted with mechanical shaft seals. Mechanical seals do notrequire maintenance unless there is more than a small amount of leakage. To define this we differentiatebetween the following:Weepage: Mechanical seals work by having two flat surfaces pushed together by axial force from the closingmechanism and by product pressure in the seal chamber. When the seal is in operation, the seal fluid lubricatesthe two faces. This thin film of lubrication protects the faces of the seal from heat and excessive wear, but itcan also allow for a small amount of leakage across the seal face. This small leakage is called a “weep”. While aweep has rather arbitrary limits, it is commonly considered to be a leakage rate of less than one drop of liquidevery minute. Seal weeps are not covered under warranty.Leakage: A leakage rate of more than one drop per minute is considered to be a “leak”. Seal leakage isnormally a result of a build-up of abrasive particles carried over in the pump suction. These particles causeexcessive wear on the seal faces. Leakage caused by wear and tear is not covered under warranty.Seal replacement is addressed in the assembly and disassembly instruction for the specific pump model used.Consult factory for assistance.Particles and debris that enter seal fluid can work into the sealing faces of the mechanical seals. Any debrispulled into the pump will mix with the seal fluid.VMAX systems equipped with mechanical seal scavenger tubing must be monitored for oil flow through thelines after startup. If oil is present in the scavenger tubing, the seals may be leaking and replacement should bescheduled. |
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