Milton Roy MILROYAL B, MILROYAL C Instruction Manual
MILROYAL® B and C Disc
Diaphragm Liquid End
Instruction Manual
Manual No : 54145
Rev. : 00
Rev. Date : 12/2015
PRECAUTIONS
The following precautions should be taken when working with metering pumps.
Please read this section carefully prior to installation.
Protective Clothing
ALWAYS wear protective clothing, face shield, safety glasses and gloves when working on or
near your metering pump. Additional precautions should be taken depending on the solution
being pumped. Refer to Safety Data Sheets for the solution being pumped.
Hearing Protection
It is recommended that hearing protection be used if the pump is in an environment where the
time - weighted average sound level (TWA) of 85 decibels is exceeded. (as measured on the
A scale - slow response)
Electrical Safety
• Remove power and ensure that it remains OFF while maintaining pump.
• DO NOT FORGET TO CONNECT THE PUMP TO EARTH / GROUND.
• Electric protection of the motor (Thermal protection or by means of fuses) is to correspond
to the rated current indicated on the motor data plate.
Liquid Compatibility
Verify if the materials of construction of the wetted components of your pump are
recommended for the solution (chemical) to be pumped.
Pumps Water “Primed”
All pumps are tested with water at the factory. If your process solution is not compatible with
water, ush the Pump Head Assembly with an appropriate solution before introducing the
process solution.
Plumbing and Electrical Connections
Always adhere to your local plumbing and electrical codes.
Line Depressurization
To reduce the risk of chemical contact during disassembly or maintenance, the suction and
discharge lines should be depressurized before servicing.
Over Pressure Protection
To ensure safe operation of the system it is recommended that some type of safety /
pressure- relief valve be installed to protect the piping and other system components from
damage due to over-pressure.
Lifting
This manual should be used as a guide only - Follow your company’s recommended lifting
procedures. It is not intended to replace or take precedence over recommendations, policies
and procedures judged as safe due to the local environment than what is contained herein.
Use lifting equipment that is rated for the weight of the equipment to be lifted.
i Instruction Manual
TABLE OF CONTENTS
SECTION 1 - DESCRIPTION................................................................. 2
1.1 GENERAL ...................................................................... 2
1.2 PRINCIPLES OF OPERATION ......................................................2
1.3 SAFETY PRECAUTIONS...........................................................2
SECTION 2 - INSTALLATION ................................................................ 3
2.1 UNPACKING .................................................................... 3
2.2 CONVERSION PROCEDURES .....................................................3
2.2.1 MILROYAL® A & B...............................................................3
2.2.2 MILROYAL® C .................................................................. 4
2.3 PIPING ....................................................................... 4
2.3.1 Piping Concentrated Sulfuric Acid .................................................. 5
2.3.2 Suction Lift Conditions ...........................................................5
SECTION 3 - OPERATION .................................................................. 6
3.1 INITIAL START-UP................................................................ 6
3.2 INITIAL ADJUSTMENT ............................................................ 6
3.2.1 Rell Valve .................................................................... 6
3.2.2 Rell Valve .................................................................... 6
3.3 MAINTENANCE ................................................................. 7
3.3.1 Hydraulic Oil ................................................................... 7
3.3.2 Check Valves .................................................................. 7
3.3.3 Plastic Check Valves............................................................. 7
3.3.3.1 Disassembly .................................................................7
3.3.3.2 Reassembly.................................................................. 7
3.3.4 Diaphragm .................................................................... 7
3.3.4.1 Disassembly .................................................................7
3.3.4.2 Reassembly.................................................................. 8
3.4 SPARE PARTS .................................................................. 8
SECTION 4 - TROUBLESHOOTING ........................................................... 9
LIST OF ILLUSTRATIONS
FIGURE 1. MILROYAL® Disc Diaphragm ........................................................ 1
FIGURE 2. Milton Roy Sludge Trap ............................................................ 5
FIGURE 3. Typical Sludge Trap Installation ......................................................5
FIGURE 4. MILROYAL® B Disc Diaphragm Liquid End Assembly Drawing (C-102-2095-0006) ............. 12
FIGURE 4. MILROYAL® B Disc Diaphragm Liquid End Assembly Drawing Continued (C-102-2095-0006) ..... 13
FIGURE 5. MILROYAL® C Disc Diaphragm Liquid End Assembly Drawing (C-102-2285-0006) ............. 15
FIGURE 5. MILROYAL® C Disc Diaphragm Liquid End Assembly Drawing Continued (C-102-2285-0006) ..... 16
iiInstruction Manual
Figure 1. MILROYAL® B and C Disc Diaphragm
1 Instruction Manual
SECTION 1 - DESCRIPTION
This Instruction Manual is designed to serve as
a supplement to Instruction Manuals 53943 and
53939, which provide both general information
and specic instructions for installing, operating,
and maintaining MILROYAL® pumps. This manual
covers only the optional Disc Diaphragm Liquids
Ends which may be tted to these pumps in place of
the standard Packed Plunger Liquid Ends. Do not
rely on this manual alone in installing, maintaining,
and operating MILROYAL® pumps.
1.1 GENERAL
The Disc Diaphragm Liquid End is particularly
suitable for pumping costly, aggressive, or
hazardous liquids without leaking. The diaphragm
is hydraulically balanced between the process
liquid on one side and the hydraulic oil on the
other side. The hydraulic oil takes the place of a
mechanical connection between pump plunger
and diaphragm.
1.2 PRINCIPLE OF OPERATION
In a Disc Diaphragm Liquid End, the reciprocating
pump plunger alternately forces hydraulic oil
against the diaphragm and then draws the oil
back into the plunger bore. This action causes the
diaphragm to ex between the limiting contour
plates.
Each suction stroke of the plunger pulls the
diaphragm towards the oil side contour plate so
that process liquid ows into the displacement
chamber through the suction ball-check valve.
Each discharge stroke of the plunger pushes the
diaphragm towards the process side contour plate
to expel the process liquid from the displacement
chamber through the discharge ball-check valve.
On each suction stroke, the discharge ball-checks
are seated, and on each discharge stroke, the
suction ball-checks are seated (pressure in
pump head is greater than suction line pressure).
This mode of operation prevents back ow and
ensures liquid movement from the suction port,
through the displacement chamber, and out the
discharge port. Precise hydraulic oil volume is
maintained by an automatic air-bleed valve and
a rell valve.
1.3 SAFETY PRECAUTIONS
When installing, operating, and maintaining the Disc
Diaphragm Liquid End, keep safety considerations
foremost. Use proper tools, protective clothing, and
eye protection when working on the equipment
and install the equipment with a view toward
ensuring safe operation. Follow the instructions in
this manual and take additional safety measures
appropriate to liquid being pumped. Be extremely
careful in the presence of hazardous substances
(e.g. corrosives, toxins, solvents, acids, caustics,
ammables etc.).
2Instruction Manual
SECTION 2 - INSTALLATION
2.1 UNPACKING
Units are shipped Free on Board (FOB) factory
and title passes to customer when carrier signs for
receipt of pump. The customer, therefore, must le
any damage claims with the carrier.
Carefully examine the shipping crate upon
receipt from the carrier to be sure there is no
obvious damage to contents. Open the crate
carefully, so that accessory items fastened to the
inside of the crate will not be lost or damaged.
Examine all materials inside the crate and check
against packing list to be sure that all items are
accounted for and undamaged.
2.2 CONVERSION PROCEDURES
To convert a pump from standard Packed Plunger
Liquid End to Disc Diaphragm Liquid End, study
drawings at the back of this manual and then mount
the liquid end to the pump as follows (numbers in
parentheses are part numbers).
2.2.1 MILROYAL® A & B (See Figure 4)
1. Remove Packed Plunger Liquid End assembly
from pump (see pump drive disassembly
instructions in Instruction Manual 53943).
Remove plunger adapter, gland cap, gland studs
or bolts, and funnel.
2. Place lip-type seal over crosshead and position
seal flush with original seal in crosshead
bore. Be careful not to damage seal lip during
installation. Also, note that seal is installed with
lip extending towards pump liquid end.
3. Place a length of 2 1/2” (64 mm) o.d. schedule
40 pipe over crosshead and against seal Using
a soft mallet, strike the pipe to drive seal into
crosshead bore until new seal is ush with
casing face.
4. Drill a 1/4” (6 mm) diameter hole OFF the
vertical center line 2 1/2” (64 mm) below the
top machined edge of the pump casing wall in
which seals are installed. (Lay a cloth in casing
to catch chips from drilling.)
5. Flush out all dirt, chips, and debris from pump
casing. Clean liquid end mounting face on pump
casing.
6. Loosely install plunger adapter in crosshead.
7. Place liquid end gasket on mounting face of
displacement chamber. Position relief valve
gasket between pump casing and displacement
chamber. This is best done by threading a pipe
nipple into the relief valve port and pushing
the gasket onto the pipe. Insert plunger
assembly in bore of displacement chamber.
Carefully t liquid end assembly to casing bore
while guiding plunger assembly into hole in
plunger adapter.
8. Thread bolts into displacement chamber from
inside pump catchall and tighten securely.
Remove gasket-positioning pipe and install relief
valve in displacement chamber so valve port
faces bottom of pump casing. Bottom plunger
rmly in plunger adapter against crosshead and
then tighten adapter securely.
9. Install air-bleed valve in top of displacement
chamber. Install hose connection and tubing for
oil return from valve to pump casing.
10. Install relief valve assembly and adapter to
displacement chamber from inside pump
catchall.
11. Install and tighten drain plug in bottom of pump
catchall.
12. Proceed to start-up instructions in Section 3.
3
Instruction Manual
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