Nova-Tech DC7 User Manual

sales@novatech-usa.com www.novatech-usa.com Tel: (866) 433-6682 Fax: (866) 433-6684 Tel: (281) 359-8538 Fax: (281) 359-0084

Installation, Operation, & Maintenance Instruction

Model DC7

Bulletin #: IOM-DC7-0407- C

Manufacturers of Quality Pumps, Controls, and Systems

STANDARD PUMP OPERATIONS 27101 Airport Road Punta Gorda, FL 33982 (941) 575-3800 Fax (941) 575-4085 www.pulsatron.com

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.

Revision History:

Rev A (4-07)

- First Release

Rev B (8-07)

- Updated lubricating oil specification and part numbers

- Add instruction to fill with oil prior to storage

- Minor text revisions

Rev C (1-09)

- Added Duplex Dimensional and BOM

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.

1. I

NTRODUCTION

2. P

RINCIPLES OF OPERATION

Table of Contents

......................................................................................................................................4

..................................................................................................................4

2.1 Reagent Head Assembly.........................................................................................................5

2.2 Control Assembly....................................................................................................................5

2.3 Gear Ratio Assembly ..............................................................................................................5

3. E

QUIPMENT INSPECTION

4. S

TORAGE

5. I

NSTALLATION

5.1 Location....................................................................................................................................6

5.2 Piping System..........................................................................................................................7

5.3 Suction Pressure Requirements............................................................................................7

5.4 Discharge Pressure Requirements........................................................................................8

6. E

QUIPMENT STARTUP

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. M

AINTENANCE

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. R

EPLACEMENT PARTS

………………………………………………………………………………………………..…...6

.......................................................................................................................................6

......................................................................................................................................14

........................................................................................................................6

...........................................................................................................................9

..........................................................................................................................24

8.1 KOPkit Program.......................................................................................................................24

8.2 Ordering KOPkits or Parts......................................................................................................24

8.3 KOPkit numbers by model: ....................................................................................................25

9. M

ODEL NUMBER IDENTIFICATION

10. W

ET END MATERIALS REFERENCE

11. T

ROUBLESHOOTING

12. P

IPING ACCESSORIES

13. D

IMENSIONAL DRAWING

14. P

ARTS DIAGRAMS AND PARTS LISTS

..............................................................................................................................27

...........................................................................................................................29

........................................................................................................................30

...........................................................................................................25

........................................................................................................26

.....................................................................................................32

1. Introduction

The OMNI® 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.

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 OMNI® 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

OMNI® 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.

Figure 2, isometric view

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 OMNI

pumps.

4. Storage

4.1.1 Short Term

Storage of your OMNI® 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.

OMNI 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.

pumps are designed to operate indoors and outdoors, but it is desirable to provide a

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.

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.

Shutoff valves should be of the same size as connecting pipe. Ball valves are preferred since they offer minimum flow restriction.

3. 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.

4. 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.

5. 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.

6. 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 OMNI® 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.

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 OMNI® 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

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. However, utilize the following values when checking reagent head bolt torque:

Model Material

DC7

Plastic (8) M10 * 1.5 8.5 75

Metal (8) M10 * 1.5 8.5 75

6.2 Output Adjustment

All OMNI® 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.

Reagent Head Bolt Torque

# Bolts and size N-m In. - Lbs

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.

6.3 Oil Fill and Maintenance

6.3.1 Oil Capacities

It is recommended that adequate supplies of PulsaLube oil be on hand for periodic changes and emergency requirements. The approximate amounts of oil required to fill the OMNI DC7 pump to specified levels are:

Pump Capacity Gearbox, Model DC7

PulsaLube EP Gear Oil 2,500 ml (2.6 Qt)

Pulsafeeder Part No. Description Container Size

NP980010-001 PulsaLube EP Gear Oil 500 ml NP980010-002 PulsaLube EP Gear Oil 1 liter NP980010-003 PulsaLube EP Gear Oil 2.5 liter NP980010-004 PulsaLube EP Gear Oil 18 liter

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 (PulsaLube EP 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

6.3.3 Oil Changes

The recommended oil change intervals are dependent upon the operating environment and level of pump usage, classified as follows:

C (32

C (320 F to 1040

F) or above 400

Normal service: Clean/dry atmosphere, an ambient operating temperature of 00 C to 40 F) and up to 2,000 annual operating hours.

Severe Service: Humid atmosphere, an ambient operating temperature below 0 C (104

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 PulsaLube 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.

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

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 best accuracy and reliable operation.

7. Maintenance

BEFORE PERFORMING ANY MAINTENANCE REQUIRING REAGENT HEAD OR VALVE (WET END)

DISASSEMBLY HAZARDOUS PROCESS MATERIALS ARE INVOLVED

AND THE ENVIRONMENT BY CLEANING AND CHEMICALLY NEUTRALIZING AS APPROPRIATE

WEAR 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 OMNI program. It is recommended that KOPkits and PulsaLube EP Gear Oil be kept available at all times.

IF THE DIAPHRAGM HAS FAILED, PROCESS FLUID MAY HAVE CONTAMINATED THE PUMP

ECCENTRIC HOUSING DIAPHRAGM WOULD PASS THROUGH THE BOTTOM DRAIN HOLE

CARE

, BE SURE TO RELIEVE PRESSURE FROM THE PIPING SYSTEM AND, WHERE

KOPkit will contain all replacement parts normally used in a preventative maintenance

(ALTHOUGH NORMALLY, ANY PROCESS FLUID BEHIND A FAILED

, RENDER THE PUMP SAFE TO PERSONNEL

). HANDLE WITH APPROPRIATE

Figure 8, wet end components

OMNI

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.

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.

Take all precautions described under the WARNINGS on page 14, Section 7 to prevent

environmental damage and exposure of personnel to hazardous materials.

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

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.

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

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.

OMNI DC7 pumps 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 DC7

7.4 Check Valve Removal & Reinstallation, Plastic Union-Nut type

1. Disconnect the power source to the drive motor.

2. Relieve all pressure from the piping system, and take all precautions necessary to prevent

contamination to the environment and personnel exposure to hazardous materials.

3. Close the inlet and outlet shutoff valves.

4. Loosen the union nuts that hold the check valves in place. It is not necessary to completely remove

the nut.

5. Push the check valve assembly out of the front by inserting your finger or a tool into the clearance

hole at the back of the holder. Note carefully the position of the component parts, to assist in reassembly. Be aware that product may leak out as the check valve parts are removed.

6. Replace both valve assemblies onto the pump, taking care to ensure they are oriented correctly, with

the balls above the seats, and the seats oriented with the o-ring seat facing up and the chamfered edge down.

The check assemblies must be pushed into the holder until they stop against the back surface. Replace parts with new as required. Sealing o-rings should generally be replaced even if the check components are re-used.

Figure 13, union-nut type check valve

Inserting the check valve assembly into the pump in the wrong directiom, or having the check seat upside down, will prevent proper seals at the o-rings, decrease pump performance, and can cause damage to the diaphragm. Each union nut should be tightened only until the o-ring seal makes good contact.

7. Carefully make sure that the check assemblies are in proper position, and tighten the union nuts.

8. Retighten any unions, flanges, or other process connections that may have been loosened previously.

7.5 Check Valve Removal and Reinstallation, Metal Tie-Bar type

1. Disconnect the power source to the drive motor.

2. Relieve all pressure from the piping system.

3. Take all precautions necessary to prevent contamination to the environment and personnel exposure

to hazardous materials.

4. Close the inlet and outlet shutoff valves.

5. Loosen the suction valve tie-bar bolts (4) and spring the suction piping slightly away from the head,

allowing liquid to drain. It may be necessary to loosen a union or flange.

6. Remove the suction check valve assembly by sliding it towards you, holding it together as a unit.

Note carefully the position of the component parts, to assist in re-assembly.

7. Loosen the discharge valve tie-bar bolts (4) and spring the discharge piping slightly away from the

head, allowing liquid to drain. It may be necessary to loosen a union or flange.

8. Remove the discharge check valve assembly by sliding it towards you, holding it together as a unit.

Note carefully the position of the component parts, to assist in re-assembly.

9. Disassemble both valves and check components for wear or damage. The seats should have a sharp

edge and be free from dents or nicks. Hold a ball firmly against the seat in front of a bright light and inspect for fit, observation of light between the ball and seat is cause for replacement.

10. Reassemble both valves using new parts as required. Sealing o-rings should always be replaced.

11. Replace both valve assemblies onto the pump, taking care to ensure they are oriented correctly, with

the balls above the seats, and the seats oriented with the sharp edge up and the chamfered edge down.

12. Carefully make sure that the check assemblies are in proper position, and tighten the four tie-bar

bolts, using a star pattern, to a torque of 6 Ft-lbs (8 N-m).

13. Retighten any unions, flanges, or other process connections that may have been loosened previously.

Figure 14, Check valves, metal construction

7.6 Motor Removal & Reinstallation

1. Disconnect the power source to the drive motor.

2. Disconnect the motor wiring from the motor.

3. Remove the four bolts retaining the motor to the motor adaptor.

Lift the motor upwards away from the pump.

4. Apply an anti-seize paste or lubricant

to all bolts, setscrews, and keys before reassembling..

5. Reinstall the motor in the reverse from removal.

6. Insert and tighten the four bolts removed in step 3.

7. Reconnect the motor wiring to the motor.

8. Connect power to the drive motor.

Motor rotation must be wired for CW

rotation, as viewed from the top of the motor, as noted by the arrow on the top

of the pump housing.

Figure 15, motor mounting

8. Replacement Parts

8.1 KOPkit Program

OMNI® KOPkits contain all replacement parts normally used in a preventative maintenance program. (PULSAlube oil is also available separately for preventative maintenance programs. Refer to Section 6 – Equipment Startup). There is a specific KOPkit for every OMNI vacuum-packed for extended storage. All OMNI pump nameplate and Pulsafeeder order documents. KOPkits can also be selected from the technical data sheet shipped with the pump or by a Pulsafeeder representative. A list of the OMNI KOPkit numbers can also be found on the next page. The kit is identified by the model number of the pump, the wetted end material, and the process connection thread type. For models with tie-bar type check valves, the appropriate components (check valve balls, seats, and o-rings) are supplied instead of the cartridges pictured.

pumps have the KOPkit number identified on the

pump model. Each KOPkit is

Figure 16, KOPkit parts

8.2 Ordering KOPkits or Parts

When ordering replacement parts always specify:

• Pump model and serial number (from pump nameplate), e.g., Model No. (DC7) with Serial No.

F406365-3.

• Part number and description from the OMNI

OMNI part numbers begin either with the letters NP, or the letter W, e.g., NP170001-THY or W210221-001.)

parts list. Include the three-character suffix. (Note:

8.3 KOPkit numbers by model:

Pump Model Wetted Material Connection Type KOPkit number

DC7 PVDF NPT / ISO / FLG NLK070X DC7 Polypropylene NPT / ISO / FLG NLK070X

DC7 316 DC7 HSO

(1)

NOTES: (1) “HSO” construction refers to the recommended materials for handling Sulfuric Acid at high

concentrations (above 95%). This configuration consists of 316ss for the reagent head, the valve guide, and the process connection. Alloy-20 is supplied for the check valve seats, and Hastelloy-C is supplied for the check valve balls. HS0 configuration is supplied only

as a KOPkit and not as an original pump configuration.

(2) DC2 through 6 models are covered in a separate publication (3) PVDF and Polypropylene KOPkits are identical as only balls and insert o-rings are supplied

9. Model Number Identification

Position Sample Specifies Options

1 and 2 DC

3 and 4 7C

5 1

6 F

7 X

Wetted materials F – PVDF, Viton o-rings, ceramic ball

Motor Supplied X – No motor purchased with pump

DC = OMNI model pump

Size/Flow 7 – diaphragm diameter

C / D – stroking rate

See sales literature for flow/pressure ratings

Motor frame 1 – IEC 90 Frame

and size 2 – IEC 100 Frame

3 – NEMA 56C Frame 4 – NEMA 143/145TC Frame

P - Polypro, Viton o-rings, ceramic ball

M – Pump purchased with motor

(future use) (future use)

10. Wet End Materials Reference

Wet End

Configuration

PVDF

(Kynar

)

(Polypropylene)

(316)

(1) DC7 check valve seats incorporate an o-ring seal

DC2 through 6 models are covered in a separate publication

n/a = materials not available in this pump size or component not used on this model

Model Connection Head Guide

DC2 DC3 DC4 DC5 DC6

DC7

1/4" NPT

1/2" NPT or ISO 7-1

1" NPT or ISO 7-1

1 1/2" NPT & ANSI

Flange and

DIN40 Flange

PVDF PVDF

DC2 DC3

n/a n/a DC4 DC5

DC6

DC7

DC2 DC3 DC4 DC5 DC6 DC7

1" NPT or I ISO 7-1 PTFE PP n/a

1 1/2" NPT & ANSI

Flange and

DIN40 Flange

1/4" NPT

1/2" NPT or ISO 7-1

1" NPT or ISO 7-1

n/a

PP PP

SS SS PTFE

Sealing O-rings

Balls Seats

Seat O-

ring

PTFE PVDF n/a

Ceramic

Viton

PVDF (oring seat)

Ceramic

PP (o-ring

seat)

Viton

(1)

Viton

(1)

Ceramic PTFE

SS SS

n/a

11. Troubleshooting

Difficulty Probable Cause Remedy

Pump does not start

No delivery

Low delivery

Delivery gradually drops.

Delivery erratic.

Inadequate backpressure Increase discharge pressure to obtain a

Delivery higher than rated.

Faulty power source. Check power source. Blown fuse, circuit breaker. Replace - eliminate overload. Broken wire. Locate and repair. Wired improperly. Check diagram. Process piping blockage. Open valves, clear other obstructions.

Motor not running. Check power source. Check wiring

diagram (see above). Supply tank empty. Fill tank. Lines clogged. Clean and flush. Closed line valves. Open valves. Ball check valves held open with solids. Clean – inspect, flush with clear fluid. Vapor lock, cavitation. Increase suction pressure. Prime lost. Re-prime, check for leak. Strainer clogged. Remove and clean. Replace screen if

necessary. Stroke adjustment set at zero. Increase stroke length setting.

Motor speed too low Check voltages, frequency, wiring, and

terminal connections. Check nameplate

vs. Specifications. Check valves worn or dirty Clean, replace if damaged Calibration system error Evaluate and correct Product viscosity too high Lower viscosity by increasing product

temperature or dilution. Increase pump

and/or piping size Product cavitating Increase suction pressure.

Check valve leakage. Clean, replace if damaged. Leak in suction line. Locate and correct. Strainer fouled. Clean or replace screen. Product change. Check viscosity and other variables. Supply tank vent plugged. Unplug vent.

Leak in suction line. Locate and correct. Product cavitating. Increase suction pressure. Entrained air or gas in product. Consult factory for suggested venting. Motor speed erratic. Check voltage and frequency. Fouled check valves. Clean, replace if necessary.

minimum pressure difference of 5 pis

from suction to discharge Suction pressure higher than discharge

pressure. Back pressure valve set too low. Increase setting. Back pressure valve leaks. Repair, clean, or replace.

Install backpressure valve or consult

factory for piping recommendations.

Difficulty Probable Cause Remedy

Noisy gearing, knocking

Discharge pressure too high. Reduce pressure. Water hammer. Install pulsation dampener. Low oil level. Examine sight glass on side of pump

Add or replace oil as required

Piping noisy.

Pipe size too small. Increase size of piping - install pulsation

dampener. Pipe runs too long. Install pulsation dampener in line. Pulsation dampener inoperative or flooded.

Refill with air or inert gas. Inspect and

replace diaphragm and recharge. No surge chamber or dampener used. Install pulsation dampeners.

Motor overheats.

Pump overloaded. Check operating conditions against pump

design. Verify discharge pressure High or low voltage. Check power source. Loose wire. Trace and correct.

Incorrect motor wiring Verify and correct Oil level low Check and add as necessary

12. Piping Accessories

Pressure Relief Valves

Pressure relief valves are designed to protect chemical feed systems from damage that may be caused by defective equipment or a blockage in the discharge line. These valves function to limit the pressure downstream of the pump. Field adjust the pressure relief valve to operate when the discharge pressure exceeds operating pressure by 10-15%. Pressure relief valve should always be adjusted to a setting below the maximum rated pressure of the pump. No potentially restrictive components, such as a valve, should be installed between the pump discharge and the PRV.

Diaphragm Backpressure Valve

A diaphragm backpressure valve creates constant back pressure. A PTFE or PTFE-faced diaphragm offers maximum chemical protection and service life, and seals spring and bonnet from product.

Be sure to install with fluid flow in direction of arrow on valve body.

Pulsation Dampener

A pulsation dampener is a pneumatically charged diaphragm-type chamber that intermittently stores hydraulic energy. Used on the inlet, it can improve NPSHA (Net Positive Suction Head available) characteristics of the suction piping system. On the discharge line it will reduce discharge pressure and pulsating flow variations.

13. Dimensional Drawing

31 32

14. Parts Diagrams and Parts Lists

33 3334

sales@novatech-usa.com www.novatech-usa.com Tel: (866) 433-6682 Fax: (866) 433-6684 Tel: (281) 359-8538 Fax: (281) 359-0084

STANDARD PUMP OPERATIONS 27101 Airport Road Punta Gorda, FL 33982 (941) 575-3800 Fax (941) 575-4085 Bulletin #: www.pulsatron.com

Rev C

IOM-DC7-0407

Nova-Tech DC7 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual