BOC Edwards 412-J User manual

5500 TABOR ROAD, PHILADELPHIA, PA. 1 9 1 2 0 U SA 2 1 5 -8 3 1 -5 4 0 0 FA X 215-831-5420
Copyright © 1999
All Rights Reserved
Revision 1.2
6-01
NEW POPPET VALVE ASSEM BLY
M ICROVAC PUM PM ICROVAC PUM P
M ICROVAC PUM PM ICROVAC PUM P
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONSINSTRUCTIONS
M ODEL :M ODEL :
M ODEL :M ODEL :
21 221 2
21 221 2 -- --J M ICROVA C PUM PJ M ICROV AC PUM P J M ICROV AC PUM PJ M ICROVA C PUM P
41 241 2
41 241 2 -- --J M ICROVA C PUM PJ M ICROV AC PUM P J M ICROV AC PUM PJ M ICROVA C PUM P
SERIA L NO.SERIA L NO.
SERIA L NO.SERIA L NO.
212212--JJ 4 1 241 2 --JJ

“ THE INFORMATION HEREIN SHALL BE TREATED IN“ THE INFORM ATION HEREIN SHALL BE TREATED IN
THE STRICTEST CONFIDENCE, AND SHALL NOT BETHE STRICTEST CONFIDENCE, AND SHALL NOT BE
DISCLOSED TO ANY THIRD PARTY WITHOUT THEDISCLOSED TO ANY THIRD PARTY WITHOUT THE
PRIOR WRITTEN PERM ISSION OFPRIOR WRITTEN PERM ISSION OF
THE INFORM ATION SHALL BE USED SOLELY FOR THETHE INFORM ATION SHALL BE USED SOLELY FOR THE
PURPOSE FOR WHICH IT HAS BEEN SUPPLIED ANDPURPOSE FOR WHICH IT HAS BEEN SUPPLIED AND
FOR NOFOR NO OTHER PURPOSE WHATSOEVER.”OTHER PURPOSE WHATSOEVER.”

J SERIES M ICROVA CJ SERIES M ICROVA C VACUVACUU M PUM PUM PUM P
TA BLE OF CON TENTSTABLE OF CON TEN TS
1.01.0 D ESCRIPTIONDESCRIPTION ______________________________________________________________________________________________________________________________________________ 11 --11
1.11.1 GGENERALENERAL (P(PRINCIPLE OFRINCIPLE OF OOPERATIONPERATION)) ____________________________________________________________________________________________________________________________ 11--11
1.21.2 GGASAS BBALLASTALLAST ________________________________________________________________________________________________________________________________________________________________ 11--22
1.31.3 WWATERATER SSYSTEMYSTEM ____________________________________________________________________________________________________________________________________________________________ 11--22
1.41.4 EELECTRICALLECTRICAL SSYSTEMYSTEM ______________________________________________________________________________________________________________________________________________________ 11--22
1.51.5 LLUBRICANTSUBRICANTS __________________________________________________________________________________________________________________________________________________________________ 11--22
1.61.6 GGUARDSUARDS ________________________________________________________________________________________________________________________________________________________________________ 11--22
1.71.7 VVACUUMACUUM BBREAK ANDREAK AND GGAGEAGE PPORTSORTS ________________________________________________________________________________________________________________________________ 11--22
2.02.0 INSTALLA TIONIN STALLA TION ____________________________________________________________________________________________________________________________________________ 22 --11
2.12.1 LLOCATING ANDOCATING AND MM OUNTINGOUNTING ____________________________________________________________________________________________________________________________________________ 22--11
2.22.2 VVACUUMACUUM PPIPINGIPING ____________________________________________________________________________________________________________________________________________________________ 22--11
2.2.1 Types of Piping Joints________________________________________________________________________ 2-2
2.2.2 Location of Gage Port ________________________________________________________________________ 2-2
2.32.3 EEXHAUSTXHAUST PPIPINGIPING ____________________________________________________________________________________________________________________________________________________________ 22--22
2.42.4 EELECTRICALLECTRICAL CCONNECTIONSONNECTIONS (S(SEEEE FFIGUREIGURE 5 & 5A)5 & 5A) __________________________________________________________________________________________________________ 22--33
2.52.5 CCOOLINGOOLING ______________________________________________________________________________________________________________________________________________________________________ 22--44
2.62.6 LLUBRICATION OFUBRICATION OF PPUM PUM P __________________________________________________________________________________________________________________________________________________ 22--44
3.03.0 OPERATIONOPERATION __________________________________________________________________________________________________________________________________________________ 33 --11
3.13.1 PPRERE--STARTSTART CCHECKHECK__________________________________________________________________________________________________________________________________________________________ 33--11
3.23.2 PPUM PUM P SSTARTTART__________________________________________________________________________________________________________________________________________________________________ 33--11
3.33.3 CHECKING OIL LEVELCHECKING OIL LEVEL ______________________________________________________________________________________________________________________________________________ 33--22
3.43.4 OPERATION OF GAS BOPERATION OF GAS BALLASTALLAST________________________________________________________________________________________________________________________________ 33--22
3.53.5 PUM P STOPPUM P STOP________________________________________________________________________________________________________________________________________________________________ 33--33
3.63.6 OPERATING NOTESOPERATING NOTES __________________________________________________________________________________________________________________________________________________ 33--33
4.04.0 CHECKINGCHECKIN G______________________________________________________________________________________________________________________________________________________ 44 --11
4.14.1 PPOOROOR VVACUUMACUUM ______________________________________________________________________________________________________________________________________________________________ 44--11
4.24.2 LLOCALIZINGOCALIZING LLEAKAGEEAKAGE ____________________________________________________________________________________________________________________________________________________ 44--11
4.34.3 RREPAIRINGEPAIRING SSM ALLM ALL LLEAKSEAKS ______________________________________________________________________________________________________________________________________________ 44--11
4.44.4 PPUM PUM P AACTIVITYCTIVITY RRECORDECORD ______________________________________________________________________________________________________________________________________________ 44--11
5.05.0 TROUBLESHOOTING GU ITROUBLESHOOTING GUIDED E __________________________________________________________________________________________________________________ 55 --11
6.06.0 SPECIFICATIONS A N DSPECIFICATIONS AND PA RTS LIPA RTS LISTST ____________________________________________________________________________________________________ 66 --11
6.16.1 212212--J PJ PERFORM ANCEERFORM ANCE CCURVEURVE ________________________________________________________________________________________________________________________________________ 66--11
6.26.2 MM ICROVACICROVAC MM ODELODEL 212212--J SJ SPECIFICATIONSPECIFICATIONS ____________________________________________________________________________________________________________________ 66--11
6.36.3 412412--J PJ PERFORM ANCEERFORM ANCE CCURVEURVE ________________________________________________________________________________________________________________________________________ 66--33
6.46.4 MM ICROVACICROVAC MM ODELODEL 414122--J SJ SPECIFICATIONSPECIFICATIONS ____________________________________________________________________________________________________________________ 66--33
7.07.0 M A INTEN A N CEM AIN TENANCE ________________________________________________________________________________________________________________________________________ 77 --11

J SERIES M ICROVA CJ SERIES M ICROVA C VACUUM PU M PVACUUM PU M P
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1.01.0 DESCRIPTIONDESCRIPTION
1.11.1 General (Principle of Operation)General (Principle of Operation)
The Stokes J Series Microvac Pumps are self-contained, rotary, oil sealed piston type units. An eccentric mounted on
the drive shaft drives the piston. Tw o floating hinge bars that are free to oscillate in the pump housing guide the piston
slide. The piston assembly rotates clockwise when facing the drive end. Air enters the pump through the intake and
passes through the piston slide as the piston performs its intake stroke. As the piston nears the top center position the
intake port is closed, separating the system from the pump (See Figure 1). At this point the air is entrapped in front of
the piston as it begins the next stroke. As the piston continues to rotate the entrapped air is compressed and
discharged through the exhaust valves and out the reservoir exhaust outlet. The exhaust valves are of a corrosion-
resistant, heavy duty, poppet type.
When the pump is in operation, lubrication of the internal parts is completely automatic. Oil is forced by atmospheric
pressure from the reservoir through internal oil passages to the shaft bearings. The oil is then fed into the pump to
provide the necessary piston-to-cylinder oil seal. The oil in the pumping chamber is forced out through the exhaust
valves w ith the compressed air and returns to the reservoir. A solenoid valve automatically prevents oil from flooding
the pump in the event of a pow er failure, or w hen the pump is shutdow n w ithout vacuum being broken.
M ODEL 212M ODEL 212 --J M ODEL 412J M ODEL 41 2 --JJ
FIGURE 1 PUM P CROSS SECTION VIEWFIGURE 1 PUM P CROSS SECTION VIEW
LIGHT ECCEN TRIC (FA R SIDE)
HEA VY EC CEN TRIC (N EAR SID E)
PISTON
A SSEM BLY
OI L M AN IFO LD
VALV E D ECK G AS KET
HINGE BAR S PA CER
IN TA KE
HINGE BAR
OIL
RESERV OIR
COVER
RESERV OIR COV ER
O-RING
OIL SEPA RA TOR
GA SKET
PU M P H OU SIN G
O-RING
EX HA U ST
SLIDE
PISTON
OIL M A NIFOLD
ASSEM BLY
OIL RESERVOIR
COVER
EX HA U ST
VALVE DECK GASKET
HINGE BAR
IN TAKE
SLIDE
LIGHT ECCEN TRIC (FAR SIDE)
HEA VY ECCENTRIC (N EA R SID E)

J SERIES M ICROVA CJ SERIES M ICROVA C VACUUM PU M PVACUUM PU M P
PAGE 1-2
1.21.2 Gas BallastGas Ballast
WARN IN G:WARN IN G: NEVER USE GAS BALLASNEVER USE GAS BALLAST WHEN PUM PING GASEST WHEN PUM PING GASES OR GAS M IXTURESOR GAS M IXTURES THATTHAT
ARE EXPLOSIVE OR FARE EXPLOSIVE OR FLAM M ABLE.LAM M ABLE.
The pump is provided w ith a manually operated gas ballast valve to overcome the adverse affect on vacuum
resulting from oil contamination. Contamination occurs when water vapor or other gaseous components enter
the pump and condense w ithin the pump, mixing with the oil as emulsified droplets. The condensate w ill mix
w ith the oil and “ flash” into vapor again as the oil circulates into high vacuum in the pump cylinder limiting the
vacuum to the vapor pressure of the condensed w ater. Gas Ballast is a controlled bleed of inert gas or air from
the atmosphere into the compression chamber of the pump. The ballast gases prevent water vapor from
condensing and mixing w ith the oil during the compression cycle. Other contaminates are also removed by
ballasting except those that dissolve in the oil.
1.31.3 Water SystemWat er Syst em
A supply of cooling w ater at 85oF. (30o C) and 1-1/2 G.P.M . (5.7 LPM ) for the 212-J and 2 G.P.M . (7.6 LPM ) for
the 412-J maximum is needed at the w ater inlet for efficient performance. Water pressure should not exceed 35
PSIG in the pump. See Section 2.5 for additional information.
1.41.4 Electrical SystemElectrical System
The main pow er supply is 230/460V., 60 Cy., 3 Ph. and should be w ired through a suitable fused motor starter.
Pow er for the oil solenoid is taken from any two of the motor leads. Check both motor and solenoid nameplates
to insure proper voltage.
1.51.5 Lubricant sLubricants
Refer to Section 2 for recommended pumping fluids.
1.61.6 GuardsGuards
The standard pump has a totally enclosed belt guard and flyw heel guard to cover the motor pulley, pump pulley, belts and
flyw heel.
1.71.7 Vacuum Break and Gage PortsVacuum Break and Gage Ports
The pump is provided w ith a ½” FPT Vacuum Break and a ¼” FPT Gage Port, as shown in Figure 7.
IM PORTANT:IM PORTANT: When using Gage PortWhen using Gage Port, provide a 90, provide a 90°° elbow and at least 12” (305 mm) of vertical pipe to the gageelbow and at least 12” (305 mm) of vertical pipe to the gage
sensor to reduce the chance of contaminating the gage with pump lubricants.sensor to reduce the chance of contaminating the gage with pump lubricants.

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2.02.0 IN STALLA TIONINSTALLA TION
2.12.1 Locating and M ount ingLocating and M ounting
Locate the pump as near as possible to the equipment being evacuated so that the Vacuum,
Water and Exhaust connections can be conveniently made. Provide for adequate space for
convenient servicing where possible.
2.1.2 The pump should be mounted on a rigid foundation, such as a concrete floor, and
made level by shimming or grouting, if necessary. M ount the pump to foundation
w ithout putting a strain or tw ist in the pump housing. See Figure 7 for foundation
mounting dimensions.
2.1.3 Remove cap from exhaust and intake openings only when ready to make a piping
connection. Also remove the plastic plug (by unscrew ing) from the Gas Ballast
valve. When pump is to be subjected to temperatures below freezing, drain the
w ater jacket through the housing drain plug to prevent cracking the housing, blow
out the w ater jacket. Follow this same procedure for storage.
2.22.2 Vacuum PipingVacuum Piping
All pipe lines should be as short as possible and should be no smaller than the inlet to the
pump. (If it is absolutely necessary to run a long line, the pipe size should be increased
50% in diameter, or more, than the inlet to the pump.) Conductance of long lines must be
checked and the line sized large enough or pumping speed of system will be seriously
decreased. When connecting the pump to the system, provide a vertical pipe at least 2 ft.
(610 mm) long betw een the pump and the system, if the pump is below the system inlet. If
the pump is above or level w ith the system inlet, provide an inverted “ U” pipe to serve as a
trap for dirt from the system and to prevent migration of pump oil tow ard the system inlet.
Be sure all vacuum piping is tight. If an inline filter is being used it should be installed as
noted below . It is advisable to install a flexible connection between pump intake and
vacuum piping to reduce vibration.(See Figures 2 & 3).
FIGURE 2FIGURE 2
PUM P BELOW SYSTEMPUM P BELOW SYSTEM
FIGURE 3FIGURE 3
PUM P ABOVE SYSTEMPUM P ABOVE SYSTEM

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PAGE 2-2
A high vacuum valve (full opening type preferred) is recommended to facilitate start-up and for checking pump
blank off pressure.
CAUTION:CAUTION: M ake sureM ake sure the system to be evacuated and connecting lines are clean and free of weld splatter, dirt orthe system to be evacuated and connecting lines are clean and free of weld splatter, dirt or
grit. Foreign matter entering the pump can cause failure and possibly damage the internal parts. Togrit. Foreign matter entering the pump can cause failure and possibly damage the internal parts. To
prevent this it is recommended that a 16 mesh w ire screen beprevent this it is recommended that a 16 mesh w ire screen be installed at the inlet connection. After 20installed at the inlet connection. After 20
hours of operation the screen must be removed.hours of operation the screen must be removed.
2.2.1 Types of Piping Joints
A. Standard wrought piping with welded joints makes the best vacuum piping system.
B. Copper piping with sweated fittings and joints can also be made vacuum tight and has the advantage of
providing a neat, clean vacuum installation.
C. Standard threaded piping, however, is satisfactory and more readily installed. The piping should be
carefully hammered to loosen any scales or chips. Blow out any resultant debris w ith compressed air
prior to installation. All male threaded joints should be carefully doped, screw ed tight and NEVER
“ backed-off” to make parts align -this is apt to cause a leak. Paint the joints while the system is under
vacuum until the paint is no longer draw n in, G.E. 1201-B, Glyptal or equivalent is recommended for
painting all connections.
2.2.2 Location of Gage Port
A vacuum gage connection is located at the upper left hand side of intake side of the pump. (See Figure 7). The
1/4" pipe plug found at this location should be replaced w ith a small vacuum ball valve to w hich the gage can be
connected. When a Stokes McLeod Gage is used a synthetic, thick wall, smooth bore tubing, such as
Tygon,makes a very satisfactory flexible connection. To prevent oil from entering the gage, locate the gage
approximately 2 ft. (610 mm) above the port.
2.32.3 Exhaust PipingExhaust Piping
CAUTION:CAUTION: Never place a valve in the exhaust line. If a valve must be installed in the line, a relief valve must alsNever place a valve in the exhaust line. If a valve must be installed in the line, a relief valve must also beo be
inserted in the line betw een the reservoir and the valve. The relief valve should be equal in size to theinserted in the line betw een the reservoir and the valve. The relief valve should be equal in size to the
line, and set to open at 2 psig.line, and set to open at 2 psig.
2.3.1 It is recommended that the exhaust be piped horizontally a short distance and tied into a vertical
exhaust pipe. The vertical exhaust pipe must be at least 12" (305 mm) long w ith the bottom end
terminated with a plug or a drain cock to allow removal of moisture and contaminated oil before
it can accumulate sufficiently to drain back into the pump oil reservoir. See Figure 4.
EX HA UST PIPIN G FIGURE 4EX HA UST PIPIN G FIGURE 4

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2.3.2 The exhaust pipe should be no smaller than the exhaust outlet and as short as possible. Pump
exhaust will contain a small amount of oil and should be handled in a manner consistent with
applicable regulations. If exhausted outside of the building point the end of the exhaust pipe
dow nw ard to prevent the entrance of rain w ater.
2.3.3 Closed circuit Oil M ist Separators are available from Stokes w hich can eliminate oil fog in the
majority of applications. The separator w ill not remove noxious or toxic gases and must be run
to a suitable trap. Consult Stokes Vacuum for specifications.
2.42.4 Electrical Connections (See Figure 5 & 5A )Electrical Connect ions (See Figure 5 & 5A)
CAUTION:CAUTION: Make sure pump is properly lubricated before starting.M ake sure pump is properly lubricated before starting.
2.4.1 Install a motor starter w ith safety device w ithin easy reach of the operator.
2.4.2 Connect the solenoid valve as in Figure 5 & 5A.
2.4.3 Connect motor so that pump shaft rotates clockw ise w hen viewed from drive end.
See 3.1 for Pre-Start Check.
IM PORTANT:IM PORTANT: M akM ake sure the proper voltage, starters and overloads are supplied to the motor.e sure the proper voltage, starters and overloads are supplied to the motor.
M ake sure that the solenoid coil leads are connected for proper voltage. BothM ake sure that the solenoid coil leads are connected for proper voltage. Both
may fail to operate if voltage is less than 90% of rated.may fail to operate if voltage is less than 90% of rated.
FIGURE 5FIGURE 5
WIRING DIAGRAMWIRIN G DIAGRAM

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2.52.5 CoolingCooling
2.5.1 The Stokes M icrovac pump is w ater cooled and must be connected to a
w ater supply.
2.5.2 The 1/2" water inlet connection is located in the pump housing on the drive side
near the bottom. See Figure 7.
2.5.3 Insert a valve in the water inlet line and regulate the w ater flow so that the
temperature of the oil in the reservoir is between 140 Deg. and 160 Deg. F. (60 -71
Deg. C) Oil temperature kits are available that automatically control the w ater flow
to maintain the proper oil temperature (Contact Stokes Vacuum for specifications).
If pump is outside and subjected to freezing temperatures, the water tank and
circulating pump should be installed with anti-freeze in the water.
CAU TION:CAU TION: DO NOT START THE PUM P WHEN ODO NOT START THE PUM P WHEN OIL TEM PERATURE IS BELOW 55IL TEM PERATURE IS BELOW 55oo F. (13F. (13oo C)C)
2.5.4 The 1/2" water outlet is located in the pump housing on the opposite side of the
w ater inlet. See Figure 7.
2.5.5 The w ater outlet SHOULDSHOULD be connected to an open drain to permit the operator to
check the flow and temperature of the outlet water periodically. There SHOULDSHOULD
NOTNOT be a valve or back pressure in the drain line. In some cases, cooling w ater
must be discharged to a pressure drain. In such cases, discharge pressure must
not exceed 35 P.S.I.G. and no block valve should be placed in discharge line unless
a 35 lb. relief valve is provided to protect pump from high inlet pressure.
NOTE:NOTE: If condensables are present in gas being pumped and gas ballast is used, throttleIf condensables are present in gas being pumped and gas ballast is used, throttle thethe
cooling water to raise operating temperature to the level for gas ballast (See Sect. 3)cooling water to raise operating temperature to the level for gas ballast (See Sect. 3)
2.62.6 Lubrication of PumpLubrication of Pum p
The successful operation of this pump depends largely on the type of oil used. An initial charge of oil is included
w ith each pump. This standard oil is Stokes V-Lube (Label F) which is recommended for general operating
conditions in a relatively clean environment. The oil is a multigrade petroleum oil, fortified for oxidation
FIGURE 5 A WIRIN G DIAGRAMFIGURE 5 A WIRIN G DIAGRAM

J SERIES M ICROVA CJ SERIES M ICROVA C VACUUM PUM PV ACUU M PUM P
PAGE 2-5
protection, containing detergent dispersants, w ith excellent flow characteristics at low temperature. It has a
viscosity of 430 SSU at 100 Deg. F. (38 Deg. C), and 82 SSU at 210 Deg. F. (99 Deg. C), w ith a vapor
pressure of 0.0001 mm Hg. at 145 Deg. F. (63 Deg. C)
If the pump is to be operated at vacuum levels that cause the oil temperature to exceed 160 Deg. F. (71 Deg. C)
for extended periods of time, a heavier grade oil should be used. Stokes V-Lube (Label G) is available for oil
temperatures up to 200 Deg. F. (94 Deg. C).
Special operating conditions may require the use of special oils. Consult Stokes Vacuum for specific
recommendations when other than regular petroleum oils are being used.
2.6.12.6.1 INITIAL FILLINITIAL FILL
The M icrovac pump is shipped with an initial charge of oil, (4 gallons)(15 L) for the 212J and (12
gallons)(45 L) for the 412J, in the reservoir. Before connecting the suction manifold slow ly rotate
the pump thru two revolutions. This w ill distribute the oil throughout the pump interior.
CAU TION:CAU TION: STARTING THE M ICROVAC PUM P WHEN OIL TEM PERSTARTING THE M ICROVAC PUM P WHEN OIL TEM PERATURE IS BELOW 55ATURE IS BELOW 55
DEG. F., (13 DEG. C) CAN RESULT IN EXCESSIVE WEAR AND GALLING DAMAGE TODEG. F., (13 DEG. C) CAN RESULT IN EXCESSIVE WEAR AND GALLING DAMAGE TO
THE M OVING PARTS.THE M OVING PARTS.

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3.03.0 OPERATIONOPERA TION
3.13.1 PrePre--start Checkstart Check
NOTE:NOTE: Remove belt guard cover. Turn pump over by hand at least tw o revolutions.Remove belt guard cover. Turn pump over by hand at least tw o revolutions.
3.1.1 A. Jog the motor momentarily w hile observing pump rotation. If the pump
does not rotate in a clockw ise direction, interchange any tw o of the three-
phase leads.
B. M ake sure the oil solenoid valve operates properly by checking the oil flow
indicator. The paddle w heel should rotate after system pressure is below
600 mm Hg. (6" Hg. Suction).
C. The oil solenoid valve is normally closed, and must be energized when the
pump starts.
The differential pressure between the oil reservoir (atmospheric pressure)
and the pump cavity (vacuum) forces the oil to the bearings and into the
pump cavity. The oil lubricates the moving parts and also creates an oil
seal.
Oil starts to flow at 600 Torr. At 400 Torr the flow is approximately 50% .
From 100% Torr to blank-off (15u), flow is 100% .
NOTE:NOTE: You must reach 400 torr in 10 minutes or a force feed lubrication system is required toYou must reach 400 torr in 10 minutes or a force feed lubrication system is required to
provide adequate oil flow to the pump cavity.provide adequate oil flow to the pump cavity.
CAU TION:CAU TION: IF PADDLE WHEEL DOEIF PADDLE WHEEL DOES NOT ROTATE, STOP PUM P IM M EDIATELY. (1) CHECKS NOT ROTATE, STOP PUM P IM M EDIATELY. (1) CHECK
OPERATION OF SOLENOID. (2) CHECK OIL LINES FOR BLOCKAGE.OPERATION OF SOLENOID. (2) CHECK OIL LINES FOR BLOCKAGE.
3.1.2 DRIVE BELT TENSION
A. At approximately the center of the span, between drive and driven pulleys,
apply 3 to 5 pounds (13.3 -22.2 N) force for the 212-J and 5 to 7 pounds (22.2 -
31.2 N) force for the 412-J, on the belt. If tension is correct, the resulting deflection
should be 7/16" (11 M M ) for the 212-J and 1/2" (13 M M ) for the 412-J.
B. Adjust, if necessary, by raising or low ering the nuts on the motor
support jackscrew s. Tighten the jackscrew nuts securely after adjustment.
NOTE:NOTE: M aintenance of proper belt tension is important. Excessive overM aintenance of proper belt tension is important. Excessive over--tightening belts istightening belts is
harmful to the shaft bearings.harmful to the shaft bearings. UnderUnder--tightening belts allow s the belts to slip.tightening belts allow s the belts to slip.
3.23.2 Pump StartPum p Start
3.2.1 Turn cooling w ater ON.ON.
WARN IN G:WARN IN G: REMOVE PLASTIC PLUG FROM EXHAUST PORT BEFORE OPERATING PUMPREM OVE PLASTIC PLUG FROM EXHAUST PORT BEFORE OPERATING PUMP
3.2.2 Depress “ start” button and check solenoid valve for proper operation.
CAU TION:CAU TION: DO NOT START PUM P WHEN OIL TEM PERATURE IS BELOW 55DO NOT START PUM P WHEN OIL TEM PERATURE IS BELOW 55oo F. (13F. (13oo CC ))

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3.2.3 Be sure the equipment being evacuated is properly cleaned and all vacuum breaks
are closed. Open pump intake valve.
3.33.3 CHECKING OIL LEVELCHECKING OIL LEVEL
3.3.1 Check oil level each day.
3.3.2 The oil level should be at center of sight glass or in low er half w hile pump is
operating at high vacuum. The level will change depending on suction pressure. In
most cases, oil is added after operating the pump for a short period of time.
3.3.3 To avoid loss of oil out the fill hole, do not add oil to the pump when in operation
unless pump is at 1 torr or less without Gas Ballast.
NOTE:NOTE: When pumping gases that contain w ater vapor it may be necessary to remove the w aterWhen pumping gases that contain w ater vapor it may be necessary to remove the water
thathat condenses in the pump reservoir sump. This can be done by opening the oil draint condenses in the pump reservoir sump. This can be done by opening the oil drain
valve and draining out w ater, and closing valve w hen oil starts to flow. The interval forvalve and draining out w ater, and closing valve when oil starts to flow . The interval for
this must be determined for each specific operation and depends on thethis must be determined for each specific operation and depends on the amount ofamount of
w ater vapor and oil temperature. Operating the pump with the oil temperature nearw ater vapor and oil temperature. Operating the pump with the oil temperature near
160 Deg. F. (71 Deg. C.) will tend to minimize formation of w ater, but w ill not160 Deg. F. (71 Deg. C.) will tend to minimize formation of w ater, but w ill not
eliminate it.eliminate it.
3.43.4 OPERATION OF GA S BALLASTOPERA TION OF GAS BALLAST
WARN IN G:WARN IN G: WHEN OPENING GAS BWHEN OPENING GAS BALLAST VALVEALLAST VALVE D O NOTDO N OT OPEN PAST THIRD M ARKOPEN PAST THIRD MARKING ONING ON
VALVE STEM . STEMVALVE STEM . STEM M AY BECOM E LOOSE ANM AY BECOM E LOOSE AND CAUSE HARM .D CAUSE HARM .
3.4.1 Open the Gas Ballast valve for maximum efficiency. For a lesser degree of ballasting, turn valve
tow ard close position. Full gas ballast will cause pump temperature to rise but this is normal.
For maximum effect of gas ballast, pump should be run at approximately 160 Deg. F. (71 Deg. C)
Operating temperature can be raised by throttling cooling w ater. Oil temperature control kits are
available from the factory. Consult Stokes Vacuum for specifications.
NOTE:NOTE: Be sure to remove the plastic plug in the Gas Ballast air intake. This plug is used forBe sure to remove the plastic plug in the Gas Ballast air intake. This plug is used for
shipping and storage purposes ONLY.shipping and storage purposes ONLY.
3.4.2 If pumping water vapor in excessive quantities, the oil may become contaminated. The oil can
be purified by running the pump w ith Gas Ballast valve full open w hile the pump is shut-off from
the system. When excessive contaminants are present, indicated by high oil level, or thinning,
formation of varnish, etc., the oil should be replaced.

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NOTE:NOTE: In dirty applications w here condensable contaminants (asphalt, pitch, epoxies, etc.) otherIn dirty applications w here condensable contaminants (asphalt, pitch, epoxies, etc.) other
than water vapor are present, the pump should be operated near 160 Deg. F. (71 Deg. C)than water vapor are present, the pump should be operated near 160 Deg. F. (71 Deg. C)
CAU TION:CAU TION: GAS BALLASTGAS BALLAST SHOULD NEVER BE USEDSHOULD NEVER BE USED IF VAPORS BEING PUMIF VAPORS BEING PUM PED AREPED ARE
EXPLOSIVE, E.G. M EEXPLOSIVE, E.G. M ETHANE GAS, HYDROGEN,THANE GAS, HYDROGEN, AND CERTAIN SOLVENTAND CERTAIN SOLVENT VAPORS.VAPORS.
WHEN GA SES OF AN EWHEN GASES OF A N EX PLOSIVE NA TU RE AREX PLOSIVE NATURE ARE BEING HAN D LED, THEBEIN G HA ND LED, THE
SAFEST PROCED U RE ISAFEST PROCED U RE IS TO PLUG THE GA S BAS TO PLU G THE GA S BA LLAST AIR INLET WITHLLAST AIR IN LET WITH AA
3/8 " NP3 /8 " NPT PIPE PLUG.T PIPE PLUG.
3.4.3 The check valve used for Gas Ballast should be inspected at least every six months
for w ear or a broken spring w hen 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 shutdow n. 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, CCl4, etc.) the pump must be ballasted with 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 will quiet discharge valve noise when 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 w hen the
pump is stopped. If this vacuum break is not permissible, solenoid valves may be
installed. With the washer removed and w ith the gas ballast valve closed, blank-off
pressure will 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 w asher if it is anticipated that it w ill be reinstalled.
3.53.5 PU M P STOPPUM P STOP
3.5.1 Close intake valve to system.
3.5.2 Stop the motor and break vacuum unless system dictates otherw ise.
NOTE:NOTE: The oil solenoid valve closes automaticThe oil solenoid valve closes automatically w hen the pump is stopped or in case ofally 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 OPERATING NOTESOPERA TING N OTES
3.6.1 If large amounts of air pass through the pump, it may become w arm 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

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PAGE 3-4
400 Torr for more than 10 minutes or at intermediate vacuums for periods
w hich cause oil temperature to exceed 200 Deg. F. (93 Deg. C.)
For optimum pump operation the oil temperature in the oil reservoir should be
betw een 140 Deg. F. (60 Deg. C.) and 160 Deg. F. (71 Deg. C.) w ith the pump
operating on the system or process. Oil temperature can be measured by inserting
a thermometer in the fill hole or by contact pyrometer on oil line near the solenoid.
If the pump is to be operated w ith oil temperature in excess of 160 Deg. F.(71 Deg.
C.) the use of a heavier viscosity oil is recommended. (See Section 2.6.)
3.6.2 When starting the pump or handling large amounts of air, oil vapor in the form
of smoke w ill issue from the exhaust. Again this is no indication of trouble, as the
volume of smoke w ill decrease as the pressure in the system decreases.
NOTE:NOTE: Stokes Vacuum closed type oil mist separator is available to alleviate exhaust oil smog.Stokes Vacuum closed type oil mist separator is available to alleviate exhaust oil smog.
3.6.3 If the pump has been shut down for an extended period, alw ays turn the pump over
at least tw o (2) revolutions by hand before starting to insure free movement of
parts.
3.6.4 Low oil temperature can cause overloading when starting the pump and possibly
prevent the pump from sealing. M icrovac pumps should not be started w hen the oil
temperature is below 55 Deg. F. (13 Deg. C)* Optimum operating oil temperature
after starting is betw een 140 Deg. F. (60 Deg. C.) to 160 Deg. F.(71 Deg. C.)
Opening the Gas Ballast valve w ill help w arm-up the oil. A Water Miser is
recommended to automatically control the oil temperature.
* THIS APPLIES ONLY IF STOKES V-LUBE “ F” IS USED. CONSULT STOKES IF OTHER OILS ARE USED.

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4.04.0 CHECKINGCHECKING
4.14.1 Poor VacuumPoor 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 Leak ageLocalizing Leak age
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.
4.34.3 Repairing Small LeaksRepairing Small Leak s
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. TeflonStokes Vacuum does not recommend using Teflon Tape for sealing pipe threads. Teflon
material is often draw n into system, causing premature wear and damage to movingmaterial is often draw n into system, causing premature wear and damage to moving
parts of the pump.parts of the pump.
4.44.4 Pump A ctivity RPum p Activity Recordecord
A record of oil changes, work 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 with a summary of major attention items is enclosed for your us.
FIGURE 6FIGURE 6
STA N DA RD VA CU UMSTA N DA RD VA CU UM
SYSTEM PIPIN GSYSTEM PIPING

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5.05.0 TROUBLESHOOTING GUIDTROU BLESHOOTIN G GUIDEE
VACU U M A T PUM P ISV A CUU M A T PUM P IS
UNSA TISFACTORYUNSA TISFA CTORY
PROBA BLE CA USE POSSIBLE REM ED Y
A. CONTAM INATED OR INSUFFICIENT OIL. 1. CHECK OIL LEVEL; UTILIZE GAS
BALLAST.
2. DRAIN AND WIPE OUT RESERVOIR AND
VALVE CHAM BER. REFILL WITH
PROPER OIL.
B. SOLENOID OIL VALVE NOT OPERATING
PROPERLY OR INOPERATIVE.
CHECK AND, IF NECESSARY CLEAN AND
OR REPLACE SOLENOID VALVE OR COIL.
C. LOOSE INTAKE FLANGE OR COVER
BOLTS.
TIGHTEN FLANGE AND SIDE COVER
BOLTS AT REGULAR INTERVALS.
D. OIL M ANIFOLD OR INTEGRAL OIL
DISTRIBUTION LEAKING.
TIGHTEN PLUGS AND M ANIFOLD
SCREWS.
E. OIL LEVEL SIGHT GLASS LEAKING CAREFULLY TIGHTEN SCREWS.
F. EXHAUST VALVE NOT SEALING 1. DISASSEM BLE, CLEAN AND CHECK ALL
PARTS THOROUGHLY.
2. REPLACE ANY DAM AGED OR WORN
PARTS.
G. PUM P SEIZES OR KNOCKS
EXCESSIVELY; INTERNAL PARTS BADLY
WORN OR BROKEN
DISASSEM BLE PISTON ASSEM BLY.
REPLACE WORN, BROKEN OR BADLY
SCORED PARTS.
H. LEAKAGE IN VACUUM SYSTEM CHECK SYSTEM AS DESCRIBED IN
SECTION 4.0.
VACU U M PUM P EX CESSIVELYVACU U M PUM P EX CESSIVELY
NOISYNOISY
PROBA BLE CA USE POSSIBLE REM ED Y
A. PUM P KNOCKING 1. CHECK OIL LEVEL, AND OIL SOLENOID
VALVE FOR PROPER OPERATION.
2. BROKEN PARTS OR FOREIGN M ATERIAL
IN THE PUM P.
3. DISASSEM BLE AND REM OVE FOREIGN
M ATERIAL IN THE PUM P.
4. REPLACE BROKEN PARTS AS
REQUIRED.
B. PUM P SEIZES DUE TO LACK OF
LUBRICATION, OR PRESENCE OF
FOREIGN M ATERIAL.
1. CHECK SOLENOID VALVE FOR PROPER
OPERATION.
2. DISASSEM BLE AND REM OVE FOREIGN
M ATERIAL. M AKE SURE OIL LINES ARE
NOT CLOGGED.
3. SM OOTH M INOR SCORING WITH #500
EM ERY CLOTH AND WASH
THOROUGHLY THEN OIL BEFORE
INSTALLING. (A CERTAIN AM OUNT OF
SCORING TO THE PISTON AND
CYLINDER AND OTHER PARTS USUALLY
WILL NOT SERIOUSLY AFFECT THE
VACUUM OBTAINABLE SO LONG AS
SCORING IS NOT IN A CONTINUOUS
GOUGE AROUND THE CIRCUM FERENCE
OF THE PISTON SURFACE.)

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PAGE 5-2
M OTOR STOPS OR WILL NOTM OTOR STOPS OR WILL NOT
STARTSTART
PROBA BLE CA USE POSSIBLE REM ED Y
A. THERM AL OVERLOAD UNITS IN M OTOR
STARTER FAIL.
CHECK CAPACITY OF THERM AL
OVERLOAD UNITS BY COM PARING
AM PERE RATING ON M OTOR
NAM EPLATE WITH OVERLOAD TABLE
INSIDE STARTER BOX. IF NECESSARY
USE 1 SIZE LARGER THAN STANDARD.
B. POSSIBLE INTERNAL SEIZURE. DISASSEM BLE AND CORRECT.
PU M P D OES NOT TURN WHENPU M P D OES NOT TURN WHEN
M OTOR STARTSM OTOR STARTS
PROBA BLE CA USE POSSIBLE REM ED Y
A. V-BELTS TOO LOOSE. TIGHTEN V-BELTS. SEE SECTION 3.1.2
PARAGRAPH B.
B. CYLINDER M AY BE FLOODED WITH
EXCESSIVE OIL DUE TO DEFECTIVE
SOLENOID VALVE. (THE VALVE M AY
HAVE STUCK IN THE OPEN POSITION AT
THE M OM ENT OF PREVIOUS SHUT
DOWN, OR FOREIGN M ATERIAL M AY BE
IN VALVE SEAT.)
TURN PUM P OVER BY HAND TO
REM OVE EXCESS OIL. DISASSEM BLE
VALVE, CLEAN AND REPLACE ANY
WORN PARTS. CHECK SOLENOID.
C. OIL VISCOSITY IS TOO HIGH OR OIL
TEM PERATURE M AY BE TOO LOW.
1. CHANGE TO LIGHTER GRADE OIL, OR
WARM OIL BEFORE POURING INTO
PUM P (ESPECIALLY WITH LOW
AM BIENT TEM PERATURES.) PUM P
SHOULD NOT BE STARTED WHEN OIL
TEM PERATURE IS LESS THAN 70
DEGREES F. (WHEN USING V-LUBE “ F” .)
2. TURN PUM P OVER BY HAND BEFORE
STARTING.
PU M P TURN S BA CKWARDS FORPU M P TURN S BA CKWARDS FOR
SEV ERA L REV OLUTIONS WHENSEV ERA L REV OLUTIONS WHEN
M OTOR IS TURNED OFF.M OTOR IS TURNED OFF.
PROBA BLE CA USE POSSIBLE REM ED Y
A. GAS BALLAST VALVE IN OPEN POSITION
WHEN PUM P WAS SHUT DOWN.
CLOSE GAS BALLAST VALVE BEFORE
SHUTTING OFF PUM P. THIS PREVENTS
ATM OSPHERIC AIR FROM REVERSING
DIRECTION OF PUM P PISTON WHEN
PUM P IS SHUTDOWN. THIS
PROCEDURE ALSO PREVENTS OIL FROM
BEING PUSHED INTO THE INLET PIPING.

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6.06.0 SPECIFICATION S A ND PSPECIFICATIONS AND PARTS LISTARTS LIST
6.16.1 212212--J Perform ance CurveJ Perform ance Curve
6.26.2 M icrovac M odel 2 12M icrovac M odel 2 12--J SpecificationsJ Specifications
ULTIM ATE VA CUU M 10 M ICRONS HG. OR LESS
DISPLACEM ENT – CUBIC FEET 150 CFM
PU M P SPEED 500 RPM
M OTOR 7-1/2 HP
STD. ELECTRICA L SPECS. 3-60-230/460
M OTOR SPEED 1800
PIPE CON N ECTIONS-
SUCTION 3”
DISCHARGE 2”
WA TER INLET ½”
WA TER OUTLET ½”
OIL CA PACITY 4 GALLONS (15 LITERS)
NET WEIGHT 950 LBS. (431 KG)
SHIPPING WEIGHT 1075 LBS. (488 KG)
HEIGHT 43-3/4” (1111 M M )
FLOOR SPACE 26-1/4” X 24” (667 X 610 M M )
COOLING WATER COOLED
REQUIRES 1-1/2 GPM (7.57 LITERS/M IN) @ 85 M AX
DEGREES F. (30 DEG. C)

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6.36.3 412412--J Perf ormance CurveJ Perform ance Curve
6.46.4 M icorvac M odel 41 2M icorvac M odel 412 --J SpecificationsJ Specif icat ions
ULTIM ATE VA CUU M 10 M ICRONS HG. OR LESS
DISPLACEM ENT – CUBIC FEET 300 CFM
PU M P SPEED 490 RPM
M OTOR 10 HP
STD. ELECTRICA L SPECS. 3-60-230/460
M OTOR SPEED 1800
PIPE CON N ECTIONS-
SUCTION 4” (102 M M )
DISCHARGE 3” (76.2 M M )
WA TER INLET ½” (13 M M)
WA TER OUTLET ½” (13 M M)
OIL CA PACITY 12 GALLONS (45 LITERS)
NET WEIGHT 1750 LBS. (794 KG)
SHIPPING WEIGHT 1975 LBS. (896 KG)
HEIGHT 51-9/16” (1310 M M)
FLOOR SPACE 40-1/8” X 22-1/2” (1019 MM X 571.5 M M ))
COOLING WATER COOLED
REQUIRES 2 GPM (7.57 LITERS/M IN) @ 85 M AX
DEGREES F. (30 DEG. C)