Pulsafeeder PULSA GLM7 Manual

Installation, Operation &
Maintenance Instruction
Models: GLM7
Bulletin #: IOM-GLM-DM7-008
PULSA GLM
®
MECHANICAL DIAPHRAGM
METERING PUMP

2
Pulsafeeder Factory Service Policy
Should you experience a problem with your Pulsafeeder pump, first consult the troubleshooting
guide in your operation and maintenance manual. If the problem is not covered or cannot be
solved, please contact your local Pulsafeeder Sales Representative or Distributor, or our
Technical Services Department for further assistance.
Trained technicians are available to diagnose your problem and arrange a solution. Solutions
may include purchase of replacement parts or returning the unit to the factory for inspection and
repair. All returns require a Return Authorization number to be issued by Pulsafeeder. Parts
purchased to correct a warranty issue may be credited after an examination of original parts by
Pulsafeeder. Warranty parts returned as defective which test good will be sent back freight
collect. No credit will be issued on any replacement electronic parts.
Any modifications or out-of-warranty repairs will be subject to bench fees and costs
associated with replacement parts.
Safety Considerations:
1. Read and understand all related instructions and documentation before attempting to install or
maintain this equipment
2. Observe all special instructions, notes, and cautions.
3. Act with care and exercise good common sense and judgment during all installation,
adjustment, and maintenance procedures.
4. Ensure that all safety and work procedures and standards that are applicable to your company
and facility are followed during the installation, maintenance, and operation of this equipment.
Copyright ©2014 Pulsafeeder, Inc. All rights reserved.
Information in this document is subject to change without notice. No part of this publication may
be reproduced, stored in a retrieval system or transmitted in any form or any means electronic or
mechanical, including photocopying and recording for any purpose other than the purchaser’s
personal use without the written permission of Pulsafeeder, Inc.

3
Table of Contents
1.
INTRODUCTION ................................................................................................................................................................ 4
2.
PRINCIPLES OF OPERATION ........................................................................................................................................ 4
2.1
Reagent Head Assembly .................................................................................................................................... 5
2.2
Control Assembly ................................................................................................................................................. 5
2.3
Gear Ratio Assembly ........................................................................................................................................... 5
3.
EQUIPMENT INSPECTION .............................................................................................................................................. 6
4.
STORAGE ........................................................................................................................................................................... 6
5.
INSTALLATION ................................................................................................................................................................. 6
5.1
Location .................................................................................................................................................................. 6
5.2
Piping System ....................................................................................................................................................... 7
5.3
Suction Pressure Requirements ....................................................................................................................... 7
5.4
Discharge Pressure Requirements .................................................................................................................. 8
6.
EQUIPMENT STARTUP ................................................................................................................................................... 9
6.1
Fastener Inspection ............................................................................................................................................. 9
6.2
Output Adjustment ............................................................................................................................................... 9
6.3
Oil Fill and Maintenance ................................................................................................................................... 10
6.4
Priming the Reagent Head ............................................................................................................................... 11
6.5
Calibration ............................................................................................................................................................ 13
7.
MAINTENANCE ............................................................................................................................................................... 14
7.1
Diaphragm Removal & Reinstallation ........................................................................................................... 16
7.2
Diaphragm Shaft Seal ........................................................................................................................................ 18
7.3
Check Valves ....................................................................................................................................................... 19
7.4
Check Valve Removal & Reinstallation, Plastic Union-Nut type............................................................. 20
7.5
Check Valve Removal and Reinstallation, Metal Tie-Bar type ................................................................ 21
7.6
Motor Removal & Reinstallation ..................................................................................................................... 23
8.
REPLACEMENT PARTS ................................................................................................................................................ 24
8.1
KOPkit Program .................................................................................................................................................. 24
8.2
Ordering KOPkits or Parts ............................................................................................................................... 24
8.3
KOPkit numbers by model ............................................................................................................................... 25
9.
MODEL NUMBER IDENTIFICATION ........................................................................................................................... 25
10.
TROUBLESHOOTING .................................................................................................................................................... 26
11.
PIPING ACCESSORIES ................................................................................................................................................. 28
12.
DIMENSIONAL DRAWING ............................................................................................................................................ 29
13.
PARTS DIAGRAMS AND PARTS LISTS .................................................................................................................... 31

4
1. Introduction
The GLM
®
DM7 metering pump is positive displacement, mechanically operated
reciprocating diaphragm pump. Each pump consists of a power end and a process
end separated by a Teflon faced diaphragm. Individual pumps will vary in appearance
due to various liquid ends and accessories; however, the basic principles of operation
remain the same.
2. Principles of Operation
Figure 1, reagent head operation
A diaphragm reciprocates at a preset stroke length, displacing an exact volume of
process fluid. Diaphragm retraction causes the product to enter through the suction
check valve. Diaphragm advance causes the discharge of an equal amount of the
product through the discharge check valve.

5
Figure 2, isometric view
2.1
Reagent Head Assembly
The typical reagent head assembly consists of reagent head, diaphragm, and
suction and discharge cartridge check valves. This assembly is the only part of the
pump to contact the process liquid; consequently, maintenance is critical to pump
performance.
2.2
Control Assembly
The GLM® DM7 pump incorporates a full motion style of stroke length adjustment.
The stroke length setting is indicated by a (0% – 100%) scale located on the stroke
adjustment assembly.
Stroke length is changed by loosening the locking screw and turning the hand knob.
This turns a mechanism, which changes the amplitude of the stroke length. As the
stroke adjustment knob is turned towards 100%, it displaces the cam eccentrically
to the rotating drive shaft. This in turn causes the pushrod and diaphragm to travel
over a longer distance. Refer to Section 6.2 for further information.
For automatic flow rate control, users can consider the Pulsafeeder MPC speed
based control system, please contact your local Pulsafeeder dealer or representative
for more information.
2.3
Gear Ratio Assembly
GLM® DM7 pumps are driven by an electric motor mounted on the motor adaptor input
flange. The motor drives a set of worm gears that convert rotational speed into torque.
They, in turn, power the eccentric shaft assembly that converts rotary motion into
reciprocating motion. The gear assembly and eccentric shaft run submerged in a
lubricating oil bath.

6
3. Equipment Inspection
Check all equipment for completeness against the order and for any evidence of shipping
damage. Shortages or damage must be reported immediately to the carrier and your
authorized representative or distributor of GLM® DM7 pumps.
4. Storage
4.1.1 Short Term
Storage of your GLM® DM7 pump for up to 12 months is considered short-term.
The recommended short-term storage procedures are:
a. Store the pump indoors at room temperature in a dry environment.
b. The lubricating oil should be added to the gearbox prior to storage
c. If required by the operating environment, take precautions to prevent entry of
water or humid air into the eccentric enclosure.
d. Prior to startup, perform a complete inspection and then start up in accordance
with instructions in this manual.
4.1.2 Long Term
Every twelve months, in addition to the above short-term procedures, power up the
motor and operate the pump for a minimum of one hour. It is not necessary to have
liquid in the reagent head during this operation, but the suction and discharge ports
must be open to atmosphere.
After twelve months of storage, Pulsafeeder’s warranty cannot cover items that are
subject to deterioration with age, such as seals, gaskets, and diaphragms. If the
pump has been in storage longer than 12 months it is recommended that these items
be inspected and replaced as necessary prior to startup. Lubricating oil should also
be changed prior to startup. Materials and labor to replace this class of item under
this circumstance are the purchaser’s responsibility. Consult your local Pulsafeeder
representative for assistance in obtaining parts and service for your pump.
5. Installation
5.1
Location
When selecting an installation site or designing a chemical feed system,
consideration should be given to access for routine maintenance.
GLM®DM7 pumps are designed to operate indoors and outdoors, but it is desirable to
provide a hood or covering for outdoor service. External heating is required if ambient
temperatures below 0° C (32° F) are anticipated, especially if pumps are not in
continuous duty. Check with the factory if concerned with the suitability of the operating
environment.
The pump must be rigidly bolted to a solid and flat foundation to minimize vibration,
which can loosen connections. When the pump is bolted down, care must be taken to
avoid distorting the base and affecting alignments. The pump must be level within 5°.
This will assure that the check valves can operate properly.

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5.2
Piping System
1. All systems should include a pressure relief valve on the discharge side, to protect
piping and process equipment, including the pump, from excess process
pressures. An external relief valve is required! There should be no devices capable
of restricting flow (such as a valve) located between the pump and the relief device.
2. Shutoff valves and unions (or flanges) on suction and discharge piping are
recommended. This permits check valve inspection without draining long runs of
piping, making periodic maintenance and inspection easier.
3. Shutoff valves should be of the same size as connecting pipe. Ball valves are
preferred since they offer minimum flow restriction.
4. Suction systems should include an inlet strainer, if appropriate for the product being
pumped. Pump check valves are susceptible to dirt and other solid contaminants, and
any accumulation can cause malfunction. The strainer should be located between the
suction shutoff valve and the pump suction valve. It must be sized to accommodate
the flow rate and the anticipated level of contamination. A 100 mesh screen size is
generally recommended.
5. Vacuum/pressure gauges in the suction and discharge lines are helpful in order to
check system operation. Gauges should be fitted with protective shutoff valves for
isolation while not in use.
6. Piping weight must not be supported by valve housings or other portions of the
reagent head, as the resulting stresses can cause leaks. If appropriate, provide for
thermal expansion and contraction so that no excess force or moments are applied
to the pump.
7. In piping assembly, use a sealing compound chemically compatible with the process
material. Users of sealing tape are cautioned to ensure that the entering pipe thread
ends are not taped, and that tape is removed from previously-used threads to the
maximum practical extent prior to re-use. Both new and existing piping should be
cleaned, preferably by flushing with a clean liquid (compatible with process material)
and blown out with air, prior to connection to the pump. Debris from the piping system
that prevents proper check valve operation is a common startup issue.
5.3
Suction Pressure Requirements
Although GLM® DM7 metering pumps have some suction lift capability, a flooded
suction (i.e., suction pressure higher than atmospheric pressure) is preferable
whenever possible. The pump should be located as close as possible to the suction
side reservoir or fluid supply source.For fluid with a vapor pressure of 5 psia or less (at
operating temperature) the wet suction lift capability is approximately ten (10) feet. If
this requirement is not met, the pump will not provide reliable, accurate flow. In suction
lift conditions, the use of a foot valve is recommended at the lowest point of the pickup
tube or pipe. Pumps under suction lift conditions may require some liquid priming
before they will operate reliably.

8
For long suction lines, and also for pumps that have a high stroking rate, the
largest possible suction line diameter should be used to provide best suction
conditions. In some cases, the proper line size may exceed the suction connection
size on the pump. Consult your local Pulsafeeder Representative for assistance
and further information on proper suction system design.

5.4
Discharge Pressure Requirements
All GLM® DM7 metering pumps are designed for continuous service at the rated
discharge pressure. If system suction pressure exceeds discharge pressure (a
condition sometimes described as “pumping downhill”), flow would be generated
(siphoning) in addition to that caused by the pump. This results in a reduction in
accuracy and loss of control over the metering process. To prevent this flow-through
condition, the discharge pressure must exceed suction pressure by at least 0.35 Bar (5
psi). This can be achieved where necessary by the installation of a backpressure valve
in the discharge line. Conditions where the actual discharge pressure exceeds the
pump’s rating are to be avoided as they will cause damage to the pump components.
Figure 3, sample system configuration
8

9
6. Equipment Startup
6.1 Fastener Inspection
All pump fasteners should be checked prior to pump operation, and occasionally
during use. This would include reagent head mounting bolts, motor mounting bolts,
and the hardware that secures the pump to its foundation. Most hardware can be
checked simply to ensure it is not loose (proposal once a month when using process).
However, utilize the following values when checking reagent head bolt torque:
Model Material Reagent Head Bolt Torque
# Bolts and size N-m In. - Lbs
DM7 Plastic (8) M10 * 1.5 8.5 75
Metal (8) M10 * 1.5 8.5 75
6.2 Output Adjustment
All GLM
®
DM7 pumps have a hand wheel for manual stroke adjustment. The hand
wheel can be adjusted to any point from 0 to 100%. This value represents the stroke
length setting and therefore the flow rate of the pump relative to its maximum output.
1. Turn the red lock screw counterclockwise to release the stroke lock. Making
adjustments without releasing the lock may damage the mechanism.
Figure 4, stroke adjustment knob and scale
2. Adjust the hand wheel to the desired output.
a. The stroke barrel indicates stroke length in 20% increments.
b. The hand wheel indicates stroke length in 0.25% increments.
For example, to set the pump to 75% stroke length, (starting from the factory default
setting of 0%) turn the hand wheel clockwise until the 60% indicator on the stroke
barrel is aligned with the edge of the knob at the “0” position on the knob scale.
Continue the clockwise rotation until the hand wheel indicator passes zero again (this
is 70%) and comes to 5, this is 75%. Refer to Figure 4.
3. Turn the lock screw clockwise to lock the stroke adjustment into position.
Adjustments can be made while the pump is at rest or operating, although
adjustments are easier to make while the pump is in operation.
Notes:
Quickly tighten the stroke lock
when complete the regulating
actions.

10
6.3
Oil Fill and Maintenance
6.3.1 Oil Capacities
It is recommended that adequate supplies of GLM gear oil be on hand for periodic
changes and emergency requirements. The approximate amounts of oil required to fill
the GLM® DM7 pump to specified levels are:
Pump Capacity Gearbox, Model
DM7
GLM Gear Oil 2,500 ml (2.6 Qt)
Pulsafeeder Part No.
Description
Container Size
GL980002-000 GLM Gear Oil 5L
6.3.2 Gearbox Oil Fill
Fill the gearbox with oil by removing the threaded oil fill cap on the top of the pump. Fill
with the proper oil (GLM Gear Oil) to the upper edge of the sight glass on the side of the
pump. Replace the cover or controller. Replace the oil fill cap. See figure 5. Note that
during operation, the oil should be visible at the middle of the sight glass.
Figure 5, oil filler cap and sight glass

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6.3.3 Oil Changes
The recommended oil change intervals are dependent upon the operating environment and level of
pump usage, classified as follows:
Normal service: Clean/dry atmosphere, an ambient operating temperature of 00 C to 400 C
(320 F to 1040 F) and up to 2,000 annual operating hours.
Severe Service: Humid atmosphere, an ambient operating temperature below 00 C (320 F) or
above 400 C (1040 F), and over 2,000 annual operating hours.
The recommended eccentric oil change interval is two (2) years for normal service and one (1)
year for severe service. The procedure is as follows:
1. Disconnect the power source to the drive motor
2. Relieve all pressure from the piping system.
3. Remove the fill plug from the top of the pump gearbox.
4. Drain the oil by removing the drain plug on the bottom of the gearbox, opposite the stroke
adjustment knob.
5. Replace the drain plug.
6. Fill the eccentric box with GLM gear oil as described under Gearbox Oil Fill.
7. Replace the fill plug and double check that the drain plug is secure.
6.4
Priming the Reagent Head
1. When handling process liquids, follow all applicable personal and facility safety guidelines.
2. Ensure that the pump is ready for operation and that all process connections are secure.
3. Open the suction and discharge line shutoff valves.
4. If the piping system design and the storage tank are such that the product flows due to
gravity through the pump, reduce the discharge pressure and the system will self-prime when
the pump is started. In the event the discharge line contains a significant amount of
pressurized air or other gas, it may be necessary to lower the discharge pressure to enable
the pump to self-prime.
5. If the installation involves a suction lift, it may be necessary to prime the reagent head and
suction line. Operate the pump as in step 4 above, many times the pump will be capable of
self-priming. If it does not begin to pump, remove the discharge valve assembly. Carefully fill
the reagent head through the discharge valve port with process (or compatible) liquid, and
then reinstall the check valve.

12
6. Start the pump at the zero stroke length setting and slowly increase the setting to 100 to
prime the pump. If this does not work, it will be necessary to fill the suction line.
7.
Filling of the suction line will necessitate the use of a foot valve or similar device at the end
of the suction line so that liquid can be maintained above the reservoir level. Remove the
suction valve assembly, fill the line, replace the suction valve, then remove the discharge
valve assembly and fill the reagent head as described in Step (3) above. The pump will now
self-prime when started up per step (4) above. Use appropriate precautions if handling
process fluid. Ensure that any other fluid used for priming is compatible with the product that
will be pumped.
 
 
Figure 6, process flow

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6.5 Calibration
Figure 7, sample flow calibration curve
All metering pumps must be calibrated to accurately specify stroke length settings for
required flow rates.
A typical calibration chart is shown above. Although output is linear with respect to stroke
length setting, an increase in discharge pressure decreases output uniformly, describing a
series of parallel lines, one for each pressure (only two are shown).
The theoretical output flow rate at atmospheric discharge pressure is based on the
displacement of the diaphragm, stroke length and the stroking rate of the pump. With
increasing discharge pressure there is a corresponding decrease in output flow. Pumps are
rated for a certain flow at a rated pressure (check nameplate). Whenever possible, calibration
should be performed under actual process conditions (i.e., the same or a similar process liquid
at system operating pressure).
To construct a calibration chart, measure the flow rate several times at three or more stroke
settings (i.e., 25, 50, 75, and 100), plot these values on linear graph paper, and draw a best-fit
line through the points. For stable conditions, this line should predict settings to attain required
outputs.
All users are encouraged to test the flow rate of their pump once installed in their
system, to ensure good accuracy and reliable operation.

14
7. Maintenance
B
EFORE PERFORMING ANY MAINTENANCE REQUIRING REAGENT HEAD OR VALVE
(
WET END
)
DISASSEMBLY
,
BE SURE TO RELIEVE PRESSURE FROM THE PIPING SYSTEM AND
,
WHERE
HAZARDOUS PROCESS MATERIALS ARE INVOLVED
,
RENDER THE PUMP SAFE TO PERSONNEL
AND THE ENVIRONMENT BY CLEANING AND CHEMICALLY NEUTRALIZING AS APPROPRIATE
.
W
EAR PROTECTIVE CLOTHING AND EQUIPMENT AS APPROPRIATE
.
Accurate records from the early stages of pump operation will indicate the type and levels of
required maintenance. A preventative maintenance program based on such records will
minimize operational problems. It is not possible to forecast the lives of wetted parts such as
diaphragms and check valves. Since corrosion rates and operational conditions affect functional
material life, each metering pump must be considered according to its particular service
conditions.
The GLM
®
KOPkit will contain all replacement parts normally used in a preventative
maintenance program. It is recommended that KOPkits and PULSALube EP Gear Oil be
kept available at all times.
I
F THE DIAPHRAGM HAS FAILED
,
PROCESS FLUID MAY HAVE CONTAMINATED THE PUMP
ECCENTRIC HOUSING
(
ALTHOUGH NORMALLY
,
ANY PROCESS FLUID BEHIND A FAILED
DIAPHRAGM WOULD PASS THROUGH THE BOTTOM DRAIN HOLE
). H
ANDLE WITH APPROPRIATE
CARE
.

15
Figure 8, wet end components
GLM
®
DM7 diaphragms do not have a specific cycle life; however, the accumulation of foreign
material or debris sufficient to deform the diaphragm can eventually cause failure. Failure can
also occur as a result of system over pressure or chemical attack. Periodic diaphragm
inspection and replacement are recommended. Each user should perform regular inspections
to determine the replacement interval that is appropriate to their system conditions.

16
7.1 Diaphragm Removal & Reinstallation
1. Adjust the stroke setting to 0% and disconnect the power source to the drive motor.
2. Relieve all pressure from the piping system.
3. Close the inlet and outlet shutoff valves.
4. Place a pan underneath the pump head adaptor to catch any liquid leakage.
5. Note the orientation of the existing check valve components. Loosen the union nuts
holding the check valves and piping to the reagent head. Remove the check valve
assemblies, drain and rinse them, and set them aside in a safe place. Unscrew the union
nuts completely from the regent head.
Figure 9, wet end components
Take all precautions described under the WARNINGS on page 14, Section 7 to prevent
environmental damage and exposure of personnel to hazardous materials.

6. Remove all but one top reagent head bolt. Product will leak out between the pump head
adaptor and reagent head as the bolts are loosened.
7. Remove the final bolt and rinse or clean the reagent head with an appropriate material.
8. Insert a screwdriver or similar tool through the oil fill hole and into the hole provided in the
pushrod, this will keep the pushrod from turning as the diaphragm is removed. Note that
depending on pushrod position, you may have to rotate the motor coupling or the diaphragm
to access the hole.
Figure 10, securing pushrod
9. Remove the diaphragm by turning it counter-clockwise.
10. Inspect the diaphragm. The diaphragm must be replaced if it is cracked, separated, or
obviously damaged.
11. Install the diaphragm.
a) Ensure that the critical sealing areas of diaphragm, reagent head, and pump head are
clean and free of debris.
b) Lubricate the elastomer side of the diaphragm liberally, where it is in contact against
the pump head and deflection plate. Use a silicone grease or silicone-based o-ring
lubricant.
c) Coat the threads and the end of the pushrod with an anti-seize paste or lubricant.
17

18
12. Thread the diaphragm (clockwise) fully onto the shaft.
When reinstalling a used diaphragm it is not necessary to maintain the previous orientation
relative to the reagent head or pump head hole pattern.
13. Remove the screwdriver from the oil fill hole and replace the cap.
14. Install the reagent head bolts and tighten in an alternating pattern to ensure an even seating
force. Torque to the values recommended in Section 6.1.
15. Reassemble the piping connections and check valves to the reagent head, using care
to orient all check valve parts properly (refer to figures 9 and 12).
16. Re-prime the pump following the procedure outlined in Section 6.3.
7.2 Diaphragm Shaft Seal
While the diaphragm is removed, inspect the shaft seal located in the pump head. If there is
evidence of damage or wear and/or oil leakage, the seal should be replaced.
1. Remove the three retainer screws and the seal retainer.
2. Pry the old seal out of the retainer.
3. Ensure the surfaces of the retainer are clean and clean of debris, scratches, or burrs.
4. Insert the new seal into the retainer by hand, do not use tools to prevent damage to the seal.
5. Inspect the piston shaft and remove any scratches, burrs, or surface corrosion or damage.
6. Lubricate the shaft with a small amount of pump oil.
7. Slide the seal and retainer back into position and secure with the three screws.
Figure 11, piston shaft seal replacement

19
7.3 Check Valves
Most fluid metering problems are related to check valves. Problems usually stem from solids
accumulation between valve and seat, corrosion of seating surfaces, erosion, or physical
damage due to wear or the presence of foreign objects.
The valve incorporates a ball, guide, and seat. Flow in the unchecked direction lifts the ball
off the seat, allowing liquid to pass through the guide. Reverse flow forces the ball down,
sealing it against the sharp edge of the seat. The guide permits the ball to rotate but
restricts vertical and lateral movement in order to minimize “slip” or reverse flow. Ball
rotation prolongs life by distributing wear over the entire surface of the ball. Since ball return
is by gravity, the valve must be in the vertical position in order to function properly. Parts are
sealed by “O”-rings.
GLM
®
DM7 xpumps utilize a multi-part check valve assembly, secured to the reagent head
with a union nut clamping arrangement (plastic construction) or a tie-bar arrangement (metal
construction).
Figure 12, check valves DM7