Stokes Microvac 412H-11 Manual de usuario

Instruction Manual

Stokes Microvac

412H-11 Piston

Vacuum Pump

INSTRUCTIONS

PART

Section

Page

DESCRIPTION

1.1

General

1-1

1.2 Gas Ballast

1-1

1.3

Water System 1-2

1.4 Electrical System

1-2

1.5

Lubricants

1-2

1.6

Guards

1-2

1.7

Vacuum Break & Gage Ports \-2

INSTALLATION

2.1 Locating and Mounting

2-1

2.2 Vacuum Piping

2-1

2.3 Exhaust Piping 2-2

2.4 Electrical Connections 2-2

2.5 Cooling 2-3

2.6 Lubrication

Pump 2-4

OPERATION

3.1

Pre-Start Check

3-1

3.2 Pump Start

3-1

3.3 Checking Oil Level 3-1

3.4 Operation

Gas Ballast 3-2

3.5 Pump Stop 3-3

3.6 Operating Notes 3-3

CHECKING

4.1

Poor Vacuum 4-1

4.2 Localizing Leakage 4-1

4.3 Repairing Small Leaks 4-1

4.4 Pump Activity Record 4-1

MAINTENANCE

5.1

Initial Servicing 5-1

5.2 Pump Disassembly 5-3

5.3 Troubleshooting Guide 5-11

MAJOR ATTENTION ITEMS BULLETIN AND MAINTENANCE CHECK LIST

7. PARTS LIST

STOKES SUPPLEMENTARY DATA

Parts Ordering Infonnation

Recommended Replacement Parts Kit

Stokes Microvac 2-Year Warranty

Pumping Hazardous Gases Sheet

Pumping Fluids, Lubricants'and Grease Bulletin

ILLUSTRATIONS

Figure

Pump Cross Section View

Vacuum Piping (Pump Below System)

Vacuum Piping (Pump Above System)

Exhaust Piping

Wiring Diagram

Gas Ballast Check Valve

7. Standard Vacuum System Piping

Exhaust Valve Assembly

Taper Lock Bushing, Installation

10.

Rotary Oil Seal

II. Exploded View

Pump

12.

Specifications

Page

1-1

2-1

2-2

2-3

3-2

4-1

5-2

5-3

5-5

1.0

DESCRIPTION

1.1

GENERAL

(Principle

Operation)

The Stokes Model

412..:11

Microvac Pump

a self-contained, rotary, oil sealed piston type unit. The piston

driven

by an eccentric mounted on the drive shaft and the piston slided

guided by two floating hinge bars that are free to

oscillate in the pump housing. Facing the drive

end:the

piston assembly rotates clockwise. Air enters the pump through

the intake and then through the piston slide until the piston completes its stroke. At this point all air previously en-

trapped

in front

the piston as it begins another stroke. As the piston continues to rotate, the air in front

compressed and discharged through the exhaust valve and fmally out the exhaust outlet. As the piston nears the top

center position the intake port

closed, separating the system from the pump (See Figure

I).

The exhaust valves are

the corrosion-resistant, heavy duty, poppet type. When the pump

in operation, lubrication

the internal parts

completely automatic. Oil

forced by atmospheric pressure from the reservoir through the oil lines to the shaft

bearings. The oil

then fed into the pump to provide the necessary piston-to-cylinder oil seal. Finally, the oil

forced out through the exhaust valve with the air and returns

the reservoir. A solenoid valve automatically prevents

oil from flooding the pump

the event

a power failure, or when the pump

shutdown without vacuum being

broken.

EXHAUST

I-i.+---

OIL

SEPARATOR

OIL

POPPET

VALVE

PISTON

Ell

SLICE

HINGE

BARS

eCCENTRIC

FiQ I

1.2

GAS

BALLAST

The pump

provided with 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 within the pump mixing with the oil

emulsified droplets.

The

condensate will mix with 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

the condensed water. Gas Ballast

a controlled bleed

air from the atmosphere. This air caries the water vapor

through the compression cycle without it condensing to liquid and mixing with oil. Thus, the water vapors are ex-

hausted without contaminating the pump oil. Other contaminates are also removed by ballasting except those that

dissolve in the oil.

NOTE:

Never use gas ballast when pumping gases

gas mixtures that

are

explosive

flammable.

1-1

1.3

WATER

SYSTEM

A supply

cooling water at

85°

F. and 2 G.P.M. maximum

needed at the water inlet for efficient performance. See

Section 2.5 for additional information.

1.4

ELECTRICAL

SYSTEM

The main power supply

230/460V., 60 Cy., 3 Ph. and should be wired through a suitable fused motor starter. Power

for the oil solenoid

taken from any two

the motor leads. Check both motor and solenoid nameplates to insure

proper voltage.

1.5

LUBRICANTS

Refer to Section 2 for recommended high vacuum grease and pumping fluids.

1.6

GUARDS

The standard pump is with a totally enclosed belt guard to cover the motor pulley, pump pulley and belts.

1.7

VACUUM

BREAK & GAGE

PORTS

The pump is provided with a

112"

FPT Vacuum Break & a

1/4"

FPT Gage Port, as shown in Fig.

II.

IMPORTANT:

When using Gage

Port,

provided a

90°

elbow

and

least

12"

vertical

pipe

the

gage sensor.

1-2

2.0 INSTALLATION

2.1

LOCATING

AND MOUNTING

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,

necessary. Bolt pump to foundation without putting a strain

twist in the

pump

housing. See Figure

for foundation bolting dimensions.

2.1.3 Remove cap from exhaust and intake openings only when ready to make a pipe connection. Also remove the

plastic plug (by unscrewing) from the Gas Ballast valve. When pump is to be subjected to temperatures below freez-

ing, drain water

jacket

through the housing drain plug to prevent cracking the housing, then

blowout

waterjacket.

Follow this same procedure for storage.

2.2 VACUUM PIPING

All pipe

lines

should be as short as possible and should be no smaller than the inlet

the pump.

(If

absolutely

necessary

run a long line, the pipe size should

increased 50% in diameter, or more, than the inlet to the pump.)

Conductance

long lines must be checked and the line sized large enough

pumping speed

system will

seriously decreased. When connecting pump to the system, provide a vertical pipe at least.2 ft. long between the

pump'

and the system,

the pump is below the system

inlet."·

the pump is above or level with the system inlet, provide an

inverted

"U"

pipe to serve as a trap for dirt from the system and to prevent migration

pump

oil toward the system

inlet. Be sure all vacuum piping is

tight

an inline filter

being used it should be installed as noted below. It is

advisable

install a flexible connection between pump intake and vacuum piping to eliminate vibration. (See Figures

2 &3).

r-----

i.O·MIN.

PUMP.

Close/Lonq

Radius

Elbow

""'2

PUIIP BELOW

SYSTEII

••

..........FLEXIBLE

CONNECTOR

PUM-P--H+R-;~!~L-..~:/~~~:;'

._11

v-3

~TEM

PUMP ABOVE SYSTEM

A high vacuum valve (full opening type preferred) is recommended to facilitate start-up and for checking

pump

blank

off

pressure.

CAUTION:

Make

sure

the

system

evacuated

and

connecting

lines

are

clean

and

free

weld

splatter,

dirt,

grit.'

Foreign

matter'

entering

the

pump

can

cause

failure

and

possibly

damage

the

internal

parts.

prevent

this

recommended

that

a 16

mesh

wire

screen

be installed

the

inlet connection.

After

hours

operation

the

screen

must

be removed.

2.2.1

TYPES

PIPING

JOINTS

Standard wrought piping with welded joints makes the best vacuum piping system.

Copper piping with sweated fittings andjoints can also be

made

vacuum tight and has

the

advantage

providing a neat, clean vacuum installation.

2-1

Standard threaded piping, however,

satisfactory and more readily installed. The piping should be

carefully hammered to loosen any scales or chips.

Blowout

the resultant with compressedair prior

to installation. All male threaded joints should

carefully doped, screwed up tight and NEVER

"backed-off'

make parts align -this

apt to cause a leak. Paint thejoints while the system is

under vacuum until the paint is no longer drawn in, G.E.

12Ol-B,

Glyptal or equivalent is

recommended for painting all connections.

2.2.2

LOCATION

GAGE

PORT

A vacuum gage connection

located at the upper left hand side

intake side

pump. (See Figure

12).

The pipe plug

found at this location should be replaced with a small vacuum ball valve to which the gage can be connected. When a

Stokes McLeod Gage

used a synthetic, thick wall, smooth bore tubing, such as Tygon, makes a very satisfactory

flexible connection.

2.3 EXHAUST PIPING

2.3.1

recommended that the exhaust be piped horizontally as short distance and tied into a vertical exhaust pipe.

The vertical exhaust pipe must

at least I

ft.

long and the bottom end

the vertical exhaust pipe terminated with a

plug or a drain cock to allow removal

moisture and contaminated oil before it can accumulate sufficiently to drain

back into pump oil reservoir. See Figure 4.

£XHAUST

PIPING

Figur~

2.3.2 The exhaust pipe should be no smaller than the exhaust outlet and

short as possible. Run

the

pipe outside

the building where the pump exhaust vapors will not be objectionable

Point the outside end

the exhaust pipe

downward to prevent the entrance

rain water.

2.3.3 Closed circuit Oil Mist Separators are available from Stokes which can eliminate oil fog

the majority

applications. The separator will not remove noxious or toxic gases and

n;lust

be run outside the bUilding. For operating·

continually under conditions

higher pressure an electro-static precipitator

recommended. Contact Stokes for.

specifics.

CAUTION: NEVER

PLACE

A VALVE

THE

EXHAUST LINE.

A VALVE

MUST BE INSTALLED

THE

LINE, A

RELIEF

VALVE MUST ALSO

BE INSERTED IN

THE

LINE

BETWEEN

THE

RESERVOIR

AND

THE

VALVE.

THE

RELIEF

VALVE SHOULD

EQUAL

SIZE

THE

LINE, AND

SET

OPEN

2 PSIG.

2.4

ELECTRICAL

CONNECTIONS

(See

Figure

CAUTION: BE SURE

PUMP

PROPERLY

LUBRICATED

BEFORE

STARTING.

2.4.1· Install a motor starter with safety device within easy reach

the operator.

2.4.2 Connect the solenoid valve as in Figure

2.4.3 Connect motor so that pump shaft rotates clockwise when viewed from driven end. See

3.1

for Pre-Start

Check.

2-2

NOTE:

MAKE

SURE

THE

PROPER

VOLTAGE, STARTERS AND OVERLOADS

ARE

SUPPLIED

THE

MOTOR.

MAKE

SURE THAT

THE

SOLENOID

COIL

LEADS

ARE

CONNECTED

FOR

PROPER

VOLTAGE.

BOTH

MAY

FAIL

OPERATE

VOLTAGE

IS LESS THAN

90%

RATED.

230/'I6O/~~0

V.,60

CY.,

PH.

LINE

vOLTAGE

230/460/5SDV.,

50/60

CY.,3Ft!.

LINE

VOLTAGE

230/460/550

V.,

SO/60

cv.,

PH.

115

II,

SO/60

CY.,

PH.

L~'

CON~~\

VOLTAG:

STOP M

2 3

O<JAL

VOLTAGE

COIL

CONNECTiONS

WI·TH

115

.,50/60

CY.,IPH.

. CONTIIOL

VOLTAGE

L2 1

230V.

460

WIRING

OIAGRAM

Fi(Jllr~

Blk

Red

2.5

COOLING

2.5.1 This pump is water cooled and must be connected to a water supply.

2.5.2 The

112"

water inlet connection

located in the pump housing on the drive side near the bottom.

2.5.3 ·Insert a valve in the water inlet line and regulate the water flow so that the temperature

the oil in the

reservoir

between 140 Deg. and 160 Deg.

Oil temperature kits are available that automatically control the water

flow to maintain the proper oil temperature (Consult factory).

Ifpump

outside and subjected to freezing tempera-

tures, water tank and circulating pump should be installed with anti-freeze in the water.

2-3

CAUTION:

NOT

START PUMP

WHEN

OIL

TEMPERATURE IS

BELOW

55°

2.5.4

The

V2" water outlet

located in the pump housing on the opposite side

the water inlet.

2.5.5 The water outlet SHOULD be connected to an open drain to permit the operator to check the flow and

temperature

the outlet water periodically. There SHOULD NOT be a valve or back pressure in this line. In some

cases, coolingwater must be discharged to a pressure drain. In such cases, discharge pressure must

not

exceed 50

P.S.I.G. and no block valve should be placed

discharge line unless a 50# reliefvalve is provided

protect pump

from high inlet pressure.

NOTE:

CONDENSABLES ARE PRESENT IN GAS BEING PUMPED AND GAS

BALLAST IS USED

THROTTLE

THE

COOLING

WATER

RAISE

OPERATING

TEMPERATURE

THE

LEVEL

NEEDED

FOR

GAS BALLAST (SEE SECT. 3).

2.6 LUBRICATION

PUMP

The successful operation

this pump depends largely

the type

oil used. An initial charge

ojl

included with

each pump. This standard oil

V-Lube (Label F) which

recommended for general operating conditions in a

relatively clean environment. The oil

a multigrade petroleum oil, fortified for·oxidation protection, containing

detergent dispersants, with excellent flow characteristics at low temperature.

has a viscosity

430 SSU at

100

Deg.

F., and 82 SSU at 2lO Deg. F., with a vapor pressure

0.0001

mm Hg. at

145

Deg. F.

the pump is to

operated at vacuum levels that cause the oil temperature to exceed 160 Deg. F. for extended

. periods

time, a heavier grade oil should be used, Stokes V-lube (Label G)

available for oil temperatures up to 200

Deg.F

. Special operating conditions may require the use

Special oils. We have listed the·most used special lubricants on the

back page

the Bulletin enclosed, Greasing and Pumping Fluids for Vacuum Components. Consult Stokes for

specific recommendations when other than regular petroleum oils are being used.

2.6.1

INITIAL

FILL

The microvac pump

shipped with

ail

Initial charge

oil (12 gallons)

inthe

reservoir.

Bt;:fore

connecting the suction

manifold slowly rotate the pump thru two revolutions. This will distribute the oil throughout the pump interior.

NOTE: STARTING

THE

MICROV

AC PUMP

WHEN

OIL

TEMPERATURE

BELOW

55 .

DEG. F., CAN RESULT IN EXCESSIVE

WEAR

AND

GALLING

DAMAGE

THE

MOVING PARTS.

'When changing oil, refer to SectionS, page

5~1

manual, Service and Maintenance.

2-4

3.0

OPERATION

3.1

PRE-START

CHECK

NOTE:

REMOVE

BELT

GUARD

COVER.

TURN

PUMP

OVER

HAND

LEAST

TWO

REVOLUTIONS.

3.1.1

NOTE:

Jog the motor momentarily while observing pump rotation.

the pump does not rotate in a

clockwise direction, interchange any two

the three-phase leads.

Make sure the oil solenoid valve operates properly by checking the oil flow indicator. The

ball

the Oil Flow Indicator bowl should rise after system pressure is below 600

Hg.

(6" Hg. Suction).

INDICATOR

BALL

DOES

NOT

RISE,

STOP

PUMP

IMMEDIATELY.

(1)

CHECK

OPERATION

SOLENOID. (2)

CHECK

OIL

LINES

FOR

BLOCKAGE

3.1.2

DRIVE

BELT

TENSION

NOTE:

At approximately the center

the span, between drive and driven pulleys, apply 5 to 7

pounds pressure on the belt.

Iftension

correct, the resulting deflection should

112".

Adjust,

necessary,

raising

lowering the location nuts on the motor support eyebolt

(39). Tighten these nuts securely after adjustments.

MAINTENANCE

PROPER

BELT

TENSION

IMPORTANT.

TOO

TIGHT

ANY

ADJUSTMENT IS

HARMFUL

THE

SHAFT

BEARINGS.

TOO

LOOSE

ADJUSTMENT

ALLOWS

THE

BELT

SLIP.

3.2

PUMP

START

3.2.1

Tum

cooling water ON.

3.2.2 Depress "start" button and check solenoid valve for proper operation.

CAUTION: DO

NOT

START

PUMP

WHEN

OIL

TEMPERATURE

BELOW

55°

3.2.3

sure the equipment being evacuated is properly cleaned and all openings closed. Open intake valve.

NOTE:

REMOVE

PLASTIC

PLUG

FROM

EXHAUST

PORT

BEFORE

OPERATING

PUMP

3.3

CHECKING

OIL

LEVEL

3.3.1 Check oil level each day.

3.3.2 The oil level should be at center

sight glass

in lower

half

while pump"is operating

high

vacuum.

Level will change depending on suctiori pressure. In most cases, oil

added

after operating the

pump

for

a short

while.

3.3.3 To

avoid

blowing oil out the fill hole, do

not

add oil

the pump when in operation unless

pump

is at I

torr or less without Gas Ballast.

NOTE:

When

pumping gases

that

contain

water

vapor

may

be necessary

remove

the

water

that

condenses in

the

pump

reservoir

sump.

This

can

done

opening

the

oil

drain

valve

and

draining

out

water,

and

closing valve when oil

starts

to flow.

The

interval

for

this

must

determined

for each specific

operation

and

depends on

the

amount

water

vapor

and

oil

temperature.

Operating

the

pump

with

the

oil

temperature

the

160

Deg. F.,

temperature

range

will

tend

minimize formation

water,

but

will

not

eliminate it.

3-1

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