To order a pump or replacement parts, rst enter the Model Number MSB1, or MSB25, followed by the Type Designation listed below in the far left column.
H/T = Hytrel Backup/ PTFE
I = EPDM
N = Neoprene
N/T = Neoprene Backup/PTFE Overlay
PE = Conductive HDPE
PS = Plated Steel
®
is a registered tradename of Exxon Mobil Corp.
Inner
Diaphragm
Plate
Intermediate
Housing
Overlay
Dia-
phragm
Valve
Rod
Seat
R = Ryton
S = Santoprene
SS = Stainless Steel
T = Virgin PTFE
V = FKM
Alloy C = Alloy C
Hard-
ware
Dia-
phragm
Ball
Valve
Material
Manifold Gasket
Seat Gasket
TTPE AL380DC45
II 1 G c T5
II 3/1 G c T5
II 1 D c T100oC
I M1 c
I M2 c
Models equipped with
Stainless Steel or Alloy
C wetted parts, and Cast
Iron midsection parts.
See page 18 for ATEX
Explanation of EC-Type
Certicate
Air
Valve
Air
Shipping
Valve
Wt. (lbs)
Cap
II 2 G c T5
II 3/2 G c T5
II 2 D c T100oC
All models, including
pumps equipped with
Aluminum wetted and
midsection parts.
See page 18 for
ATEX Explanation
of Type Examination
Certicate.
msb1dl5sm-rev0813 Models MSB1 & MSB25 Page 2
Materials
Materials
Nitrile General purpose, oil-resistant. Shows good solvent, oil, water and hydraulic uid resistance. Should
not be used with highly polar solvents
like acetone and MEK, ozone, chlorinated hydrocarbons and nitro hydrocarbons.
EPDM Shows very good water and chemical resistance. Has poor resistance to oil and solvents, but is fair in
ketones and alcohols.
NEOPRENE All purpose. Resistant to vegetable oils. Generally not affected by moderate chemicals, fats,
greases and many oils and solvents. Generally
attacked by strong oxidizing acids, ketones, esters, nitro hydrocarbons and chlorinated aromatic hydrocarbons.
®
HYTREL
PTFE Chemically inert, virtually impervious. Very few chemicals are known to react chemically with
PTFE: molten alkali metals, turbulent liquid or gaseous uorine and a few uoro-chemicals such as
chlorine triuoride or oxygen diuoride which readily liberate free uorine at elevated temperatures.
FKM (Fluorocarbon) shows good resistance to a wide range of oils and solvents; especially all aliphatic,
aromatic and halogenated hydrocarbons, acids, animal
and vegetable oils. Hot water or hot aqueous solutions (over 70°F) will attack FKM.
Santoprene
lent abrasion resistance.
‡
Good on acids, bases, amines and glycols at room temperature.
®
Injection molded thermoplastic elastomer with no fabric layer. Long mechanical ex life. Excel-
CF-8M Stainless Steel equal to or exceeding ASTM specication A743 for corrosion resistant iron chro-
mium, iron chromium nickel, and nickel based alloy castings for general applications. Commonly referred
to as 316 Stainless Steel in the pump industry.
Maximum and Minimum Temperatures are the limits for which
these materials can be operated. Temperatures coupled with
pressure affect the longevity of diaphragm pump components.
Maximum life should not be expected at the extreme limits of
the temperature ranges.
Operating Temperatures
Maximum Minimum
190°F -10°F
88°C -23°C
280°F -40°F
138°C -40°C
200°F -10°F
93°C -23°C
220°F -20°F
104°C -29°C
220°F -35°F
104°C -37°C
350°F -40°F
177°C -40°C
275°F -40°F
135°C -40°C
ALLOY C CW-12MW equal to or exceeding ASTM A494 specication for nickel and nickel alloy castings.
For specic applications, always consult “Chemical Resistance Chart" Technical Bulletin
Model MSB25 features British Standard Pipe (BSP)
Tapered threaded connections
NOTE: UNIT FURNISHED WITH FEET
AS STANDARD. FOR STATIONARY
BOLT DOWN USE, RUBBER FEET CAN
BE REMOVED.
*16 7/16 With Metal Muffler
MSB1: 1" NPT(F) SUCTION AND DISCHARGE • ½" NPT(F) AIR INLET PORT • ¾" NPT(F) AIR EXHAUST PORT (NOT SHOWN)
MSB25: 1" BSP(F) TAPERED SUCTION AND DISCHARGE • ½" NPT(F) AIR INLET PORT • ¾" NPT(F) AIR EXHAUST PORT (NOT SHOWN)
"A"
"B"
(109)
9
32
4
(217)
9
16
8
(248)
3
9
4
(316)
(333)
16
8
7
1
12
13
(217)
16
9
8
9
" DIA.
32
MOUNTING HOLES
TYP. (4) PLACES
DISCHARGE PORT
1" NPT(F)
1" BSP(F) (25)
(330)
13
(133)
4
1
5
SUCTION PORT
1" NPT(F)
1" BSP(F) (25)
(17)
11
16
D
(149)
7
5
8
1
4
2
(114)
C
(229)
9
(260)
1
10
4
AIR EXHAUST
3
" NPT(M)
4
AIR INLET
1
" NPT(F)
2
(367)
16
7
14
*
(194)
8
5
7
E
msb1dl5sm-rev0813 Models MSB1 & MSB25 Page 3
II 2GD T5
SERVICE & OPERATING MANUAL
Model MSB1 Type 5
See pages 2, 18 & 19
for ATEX ratings
PLEASE NOTE!
The photos shown in this manual are for general instruction only. Your specic
model may not be shown. Always refer to the parts list and exploded view draw-
ing for your specic model when installing, disassembling or servicing your pump.
PRINCIPLE OF PUMP OPERATION
This ball valve pump is powered by compressed air and is a 1:1 pressure ratio
design. It alternately pressurizes the inner side of one diaphragm chamber, while
simultaneously exhausting the other inner chamber. This causes the diaphragms,
which are connected by a common rod, to move endwise. Air pressure is applied
over the entire surface of the diaphragm, while liquid is discharged from the opposite
side. The diaphragm operates under a balanced condition during the discharge
stroke, which allows the unit to be operated at discharge heads over 200 feet (61
meters) of water head.
Since the diaphragms are connected by a common rod, secured by plates to the
center of the diaphragms, one diaphragm performs the discharge stroke, while the
other is pulled to perform the suction stroke in the opposite chamber.
For maximum diaphragm life, keep the pump as close to the liquid being pumped
as possible. Positive suction head in excess of 10 feet of liquid (3.048 meters) is
not recommended. For applications with higher suction heads, consult the factory.
Alternate pressuring and exhausting of the diaphragm chamber is performed by
means of an externally mounted, pilot operated, four-way spool type air distribution
valve. When the spool shifts to one end of the valve body, inlet air pressure is applied to one diaphragm chamber and the other diaphragm chamber exhausts. When
the spool shifts to the opposite end of the valve body, the porting of chambers is
reversed. The air distribution valve spool is moved by an internal pilot valve which
alternately pressurizes one side of the air distribution valve spool, while exhausting
the other side. The pilot valve is shifted at each end of the diaphragm stroke by the
diaphragm plate coming in contact with the end of the pilot valve spool. This pushes
it into position for shifting of the air distribution valve.
The chambers are manifolded together with a suction and discharge check valve
for each chamber, maintaining ow in one direction through the pump.
Model MSB25 Type 5
Original Instructions
INSTALLATION & START-UP
Locate the pump as close to the product being pumped as possible, keeping
suction line length and number of ttings to a minimum. Do not reduce line size.
For installations of rigid piping, short exible sections of hose should be
installed between pump and piping. This reduces vibration and strain to the piping
system. A Warren Rupp Tranquilizer
reduce pulsation in ow. Tighten all fasteners before pump startup.
This pump was tested at the factory prior to shipment and is ready for operation.
It is completely self-priming from a dry start for suction lifts of 10-15 feet (3.05-4.57
meters) or less. For suction lifts exceeding 15 feet of liquid, ll the chambers with
liquid prior to priming.
®
surge suppressor is recommended to further
AIR SUPPLY
Air supply pressures cannot exceed 125 psi (8.61 bar). Connect the pump
air inlet to an air supply of sufcient capacity and pressure required for desired
performance. When the air line is solid piping, use a short length of exible hose
(not less than 3/4" (19mm) in diameter) between pump and piping to eliminate
strain to pipes.
msb1dl5sm-rev0813 Models MSB1 & MSB25 Page 4
Available from
Distributor
Available from
MARATHON
INSTALLATION GUIDE
Top Discharge Ball or Flap Valve Unit
CAUTION
The air exhaust should be
piped to an area for safe
disposition of the product
being pumped, in the event
of a diaphragm failure.
msb1dl5sm-rev0813 Models MSB1 & MSB25 Page 5
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