J SERIES M ICROV A CJ SERIES M ICROV A C VA CU V A CUUM PU M P UM PU M P
PA GE 4-1
4.04.0 CHECKINGCHECKING
4.14.1 Poor V acuumPoor Vacuum
No pump will give good results on a poor vacuum system. If the vacuum in the system is
unsatisfactory, the usual cause is leakage.
4.24.2 Localizing LeakageLocalizing Leakage
A leakup rate test will help localize a vacuum leak. Such a test is easily made by
successively isolating and evacuating each section of the system. The in-leakage rate of
each isolated section can be measured. The pressure change rate is then noted.
4.2.1 A vacuum leak detector w ill speed up the process of locating leaks. Stokes Vacuum
offers vacuum leak detection services.
4.3 4.3 Repairing Small LeaksRepairing Small Leaks
To repair small leaks or to close pores, use Sealing Compound, Stokes Vacuum Part
No. 4-927. When replacing plug type valves (if used) use Loctite Pipe Sealer No. 714-1 to
seal the threads. Gate, Ball or Butterfly type high vacuum valves are preferred for high
vacuum service.
NOTE:NOTE: Stokes Vacuum does not recommend using Teflon Tape for sealing pipe threads. Teflon Stokes Vacuum does not recommend using Teflon Tape for sealing pipe threads. Teflon
material is often drawn into system, causing premature wear and damage to moving material is often draw n into system, causing premature w ear and damage to moving
parts of the pump.parts of the pump.
4.44.4 Pump Activity RPump A ctivity Recordecord
A record of oil changes, w ork done on pump, and changes or additions to the system is valuable w hen
checking for leaks or poor vacuum. A sample mechanical vacuum pump preventive maintenance check
list along w ith a summary of major attention items is enclosed for your us.
FIGURE 6FIGURE 6
STA ND ARD V ACUU M STA ND ARD V ACUU M
SYSTEM PIPIN GSYSTEM PIPIN G
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