J SERIES M ICROV A CJ SERIES M ICROV A C VA CUUM PUM P V A CUUM PUM P
PAGE 3 -3
NOTE:NOTE: In dirty applications w here condensable contaminants (asphalt, pitch, epoxies, etc.) other In dirty applications where condensable contaminants (asphalt, pitch, epoxies, etc.) other
than w ater vapor are present, the pump should be operated near 160 Deg. F. (71 Deg. C)than w ater vapor are present, the pump should be operated near 160 Deg. F. (71 Deg. C)
CAU TION:CAU TION: GAS BALLAST GAS BALLAST SHOULD NEVER BE USEDSHOULD NEVER BE USED IF VAPORS BEING PUM IF VAPORS BEING PUM PED ARE PED ARE
EXPLOSIVE, E.G. MEEXPLOSIVE, E.G. METHANE GAS, HYDROGEN,THANE GAS, HYDROGEN, AND CERTAIN SOLVENT AND CERTAIN SOLVENT VAPORS. VAPORS.
WHEN GASES OF A N EWHEN GA SES OF AN EX PLOSIV E NA TURE ARE X PLOSIV E NA TU RE ARE BEING HAND LED, THE BEIN G HANDLED, THE
SAFEST PROCEDURE ISAFEST PROCED URE IS TO PLUG THE GA S BAS TO PLUG THE GAS BA LLAST AIR INLET WITHLLAST AIR INLET WITH A A
3/8" N P3/8" NPT PIPE PLU G.T PIPE PLUG.
3.4.3 The check valve used for Gas Ballast should be inspected at least every six months
for wear or a broken spring when operating on an (8) hour a day basis; every 3
months for (24) hour a day operation. Replacement part number is A-606-003-001.
3.4.4 The gas ballast valve should be closed when the pump is stopped. If the valve is
open, gas w ill be draw n into the pump through the check valve and the vacuum
manifold w ill be pressurized w ith atmospheric air. If desired, a solenoid valve
attached to the gas ballast inlet and electrically connected to the motor leads can
be used to turn off the gas ballast automatically on pump shutdown. Contact your
local Stokes Vacuum representative for additional information.
3.4.5 When a pressurized gas is used to ballast the pump, the pressure must be reduced
to 2 psi maximum. The use of higher pressures may damage the pump.
3.4.6 When pumping an explosive gas, (i.e. hydrogen, silane, methane) or corrosive gas,
(Cl, F, CCl
4
, etc.) the pump must be ballasted w ith an inert gas (nitrogen, argon).
The use of air for ballasting under the above conditions can result in an explosion
or excessive corrosion inside the pump.
3.4.7 Opening the gas ballast slightly w ill quiet discharge valve noise w hen the pump is
blanked off but w ill prevent reaching the low est final pressure.
3.4.8 To maintain a low blank-off noise level on a continuous basis, the valve seal w asher
can be removed from the valve stem. This w ill provide a small amount of ballast at
all times even w hen the valve is fully closed. It w ill also break vacuum when the
pump is stopped. If this vacuum break is not permissible, solenoid valves may be
installed. With the w asher removed and with the gas ballast valve closed, blank-off
pressure w ill be approximately 200 microns. The seal w asher can be reinstalled
w hen ballast on a continuous basis is no longer required. Care should be taken not
to damage the seal washer if it is anticipated that it w ill be reinstalled.
3.53.5 PUM P STOPPUM P STOP
3.5.1 Close intake valve to system.
3.5.2 Stop the motor and break vacuum unless system dictates otherwise.
NOTE:NOTE: The oil solenoid valve closes automaticThe oil solenoid valve closes automatically w hen the pump is stopped or in case of ally w hen the pump is stopped or in case of
pow er failure, thus preventing pump and vacuum system from being flooded with oil.pow er failure, thus preventing pump and vacuum system from being flooded with oil.
3.63.6 OPERA TIN G NOTESOPERA TING NOTES
3.6.1 If large amounts of air pass through the pump, it may become warm and under
severe conditions may become hot. This does not indicate trouble. The pump is
designed for high vacuum work and should not be operated at pressures above
To Next Page
Loading...
