SANDPIPER RHDF2 User Manual
SERVICE & OPERATING MANUAL
RHDF2
Heavy Duty Flap Valve
AirVantage Design Level 1
Table of Contents
SAFETY PRECAUTIONS
Engineering, Performance and Construciton Data ............................................................................ 1
Explanation of Pump Nomenclature .................................................................................................. 2
Performance Curve ........................................................................................................................... 3
Dimensions ........................................................................................................................................ 4
Important Installation Information ...................................................................................................... 5
Principle of Pump Operation .............................................................................................................. 7
Principle of AirVantage ...................................................................................................................... 7
Installation and Start-Up .................................................................................................................... 7
Air Supply .......................................................................................................................................... 7
Air Line Moisture ................................................................................................................................ 7
Air Valve Lubrication .......................................................................................................................... 7
Air Inlet and Priming .......................................................................................................................... 7
Between Uses ................................................................................................................................... 7
Pump Troubleshooting ....................................................................................................................... 9
AirVantage Troubleshooting ...................................................................................................... 10-11
Composite Repair Parts List ........................................................................................................... 12
Composite Repair Parts Kits ........................................................................................................... 13
Composite Repair Parts Drawing: Wetted Side ............................................................................... 14
Diaphragm and Check Valve Servicing ........................................................................................... 15
US Patent # 6,241,487
US Patent # 7,521,921 Pending
Composite Repair Parts Drawing: Air Side ...................................................................................... 16
Intermediate and AirVantage Sensor Servicing ............................................................................... 17
Air Valve Servicing, Assembly Drawings and Parts List .................................................................. 18
Air Valve Servicing with Stroke Indicators, Assembly Drawings and Parts List .............................. 19
Pilot Valve and Actuator Plunger Servicing .................................................................................... 20
Pulse Output Kits and Drawing ....................................................................................................... 21
Composite Repair Parts Drawing - AirVantage Unit ........................................................................ 23
AirVantage Servicing - Solenoid Valve and Pressure Regulator ..................................................... 24
AirVantage Servicing - Power Generation Module .......................................................................... 25
AirVantage Servicing - Control Module ........................................................................................... 26
AirVantage Servicing - Sensor Assembly ....................................................................................... 27
AirVantage Servicing - Poppet Valve Drawing ................................................................................. 28
AirVantage Servicing - Poppet Valve .............................................................................................. 29
AirVantage Servicing - Check Valve ............................................................................................... 30
Grounding the Pump ...................................................................................................................... 31
Pumping Hazardous Liquids - Shutdown Procedure ...................................................................... 32
Converting the Pump for Piping Exhaust Air ................................................................................... 32
Material Codes for the Last 3 Digits of the Part Number ................................................................ 33
CE Declaration of Conformity .......................................................................................................... 34
rhdf2dl1-rev0614
Warren Rupp, Inc.® • A Unit of IDEX Corporation • 800 N. Main St., Manseld, Ohio 44902 USA
Telephone (419) 524-8388 • Fax (419) 522-7867 • warrenrupp.com
©Copyright 2014 Warren Rupp, Inc. All rights reserved.
Cautions - Read Operating and Safety Precautions First
IMPORTANT
Before installation and
start-up of the pump read
these safety warnings and
instructions in this manual
completely. It is the responsibility of the
purchaser to retain this manual for reference.
Failure to comply with the recommendations
stated in this manual will damage the pump,
and void factory warranty.
CAUTION
Before pump operation,
inspect all gasketed
fasteners for looseness
caused by gasket creep. Re-
torque loose fasteners to
prevent leakage. Follow recommended torques
stated in this manual.
CAUTION
Pump not designed,
tested or certified to be
powered by compressed
natural gas. Powering the
pump with natural gas will void the warranty.
WARNING
In the event of diaphragm
rupture, pumped material
may enter the air end of the
pump, and be discharged
into the atmosphere. If
pumping a product which is hazardous or toxic,
the air exhaust must be piped to an appropriate
area for safe disposition.
WARNING
Take action to prevent static
sparking. Fire or explosion
can result, especially when
handling ammable liquids.
The pump, piping, valves,
containers or other miscellaneous equipment
must be grounded. (See page 30)
WARNING
This pump is pressurized
internally with air during
operation. Always make
certain that all bolts are in
good condition and that
all of the correct bolts are
reinstalled during assembly.
WARNING
When used for toxic or
aggressive uids, the pump
should always be ushed
clean prior to disassembly.
WARNING
Before doing any
maintenance on the pump,
be certain all pressure is
completely vented from the
pump, suction, discharge,
piping, and all other openings and connections.
Be certain the air supply is locked out or made
non-operational, so that it cannot be started
while work is being done on the pump. Be certain
that approved eye protection and protective
clothing are worn at all times in the vicinity of the
pump. Failure to follow these recommendations
may result in serious injury or death.
WARNING
Airborne particles and
loud noise hazards.
Wear ear and eye
protection.
Recycling
Warren Rupp is committed to protecting the environment and
preventing pollution for the benet of our employees, as well as local and global
communities, now and in the future.
Many components of SANDPIPER® Metallic AODD pumps are made of
recyclable materials (see chart on page 32 for material specications). We encourage pump users to recycle worn out parts and pumps whenever possible.
Follow all applicable guidelines if hazardous material has been pumped.
WARNING
Use safe practices
kg
when lifting
the pump. The discharge line may be pressurized
and must be bled of its pressure.
Before maintenance
or repair, shut off the
compressed air line,
bleed the pressure, and
disconnect the air line from
WARNING
Quality System
ISO 9001 Certied
Environmental
Management System
ISO 14001 Certied
US Patent # 6,241,487
US Patent # 7,521,921 Pending
RHDF2
AirVantage
Design Level 1
Heavy Duty Flap
Air-Operated
Double Diaphragm Pump
ENGINEERING, PERFORMANCE
& CONSTRUCTION DATA
INTAKE/DISCHARGE PIPE SIZE
2" NPT (internal)
CAUTION! Operating temperature limitations are as follows:
CAPACITY
0 to 165 gallons per minute
(0 to 624 liters per minute)
AIR VALVE
No-lube, no-stall
design
SOLIDS-HANDLING
Up to 2 in. (50mm)
HEADS UP TO
125 psi or 289 ft. of water
(125 psi or 8.6 bar inlet) (8.6 bar or 88 meters)
Operating Temperatures
DISPLACEMENT/STROKE
.48 Gallon / 1.81 liter
Materials Maximum Minimum
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 oil. 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.
Santoprene®:: Injection molded thermoplastic elastomer with no fabric layer. Long mechanical ex life.
Excellent abrasion resistance.
Virgin 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.
Polypropylene:
UHMW Polyethylene:
®
HYTREL
For specic applications, always consult The Warren Rupp Chemical Resistance Chart
SANDPIPER® pumps are designed to be powered only by compressed air.
rhdf2dl1sm-rev0614 Model RHDF2 Page 1
Good on acids, bases, amines and glycols at room temperature.
190° F
88° C
280° F
138° C
200° F
93° C
275° F
135° C
220° F
104° C
350° F
177° C
180° F
82° C
180° F
82° C
190° F
88° C
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.
-10° F
-23° C
-40° F
-40° C
-10° F
-23° C
-40° F
-40° C
-35° F
-37° C
-40° F
-40° C
32° F
0° C
32° F
0° C
-10° F
-23° C
Explanation of Pump Nomenclature, RHDF2 · Flap Valve
To order a pump or replacement parts, rst enter the Model Number RHDF2, followed by Type Designation listed below in the far left columns.
Inner Flap
Type AirVantage Manifold Outer Inner Diaphragm Diaphragm Intermediate Diaphragm Valve Hard- Diaphragm Valve Sealing Shipping
Designation
Options Elbow Chamber Chamber Plate Plate Housing Rod Seat ware Material Rings Wt. lbs.
DA6A S. AL AL AL PS PS AL SS SS PS N U N 107
DB6A S. AL AL AL PS PS AL SS SS PS B B B 107
DV6A S. AL AL AL PS PS AL SS SS PS V V V 107
DN6A S. AL AL AL PS PS AL SS SS PS N N N 107
DI6A S. AL AL AL PS PS AL SS SS PS I I I 107
DP6A S. AL AL AL PS PS AL SS SS/I PS S S I 107
DR6A S. AL AL AL PS PS AL SS SS PS H H N 107
DA6I S. CI CI AL PS PS AL SS SS PS N U N 150
DB6I S. CI CI AL PS PS AL SS SS PS B B B 150
DV6I S. CI CI AL PS PS AL SS SS PS V V V 150
DN6I S. CI CI V PS PS AL SS SS PS N N N 150
DI6I S. CI CI AL PS PS AL SS SS PS I I I 150
DR6I S. CI CI AL PS PS AL SS SS PS H H N 150
DP6I S. CI CI AL PS PS AL SS SS/I PS S S I 150
DA6S S.
DB6S S.
DF6S S.
DV6S S.
DN6S S.
DI6S S.
DP6S S.
DR6S S.
‡SS ‡SS AL ‡SS PS AL SS SS PS N U N 157
‡SS ‡SS AL ‡SS PS AL SS SS PS B B B 157
‡SS ‡SS AL ‡SS PS AL SS SS PS F F F 157
‡SS ‡SS AL ‡SS PS AL SS SS PS V V V 157
‡SS ‡SS AL ‡SS PS AL SS SS PS N N N 157
‡SS ‡SS AL ‡SS PS AL SS SS PS I I I 157
‡SS ‡SS AL ‡SS PS AL SS SS/I PS S S I 157
‡SS ‡SS AL ‡SS PS AL SS SS PS H H N 157
Meanings of
Abbreviations:
S = Self Contained
Electrical Generator
P = 100 VAC Electrical
Conneciton
A = Compressed Fibre DC = Die Cast PS = Plated Steel SS/I = Stainless Steel seat w/EPDM O-Ring
AL = Aluminum H = Hytrel
B = Nitrile I = EPDM SS = Stainless Steel U = Urethane
CI = Cast Iron N = Neoprene V = FKM (Fluorocarbon) F = FDA Accepted White Nitrile
®
S = Santoprene® T = PTFE
‡ CF-8M Stainless Steel equal to or exceeding ASTM specication A743 for corrosion resistant iron chromium, iron chromium nickel, and nickel based alloy castings for
general applications. Commonly referred to as 316 Stainless Steel in the pump industry.
Santoprene is a registered tradename of Exxon Mobil Corp.
Hytrel is a registered tradename of E.I. du Pont.
rhdf2dl1sm-rev0614 Model RHDF2 Page 2
Performance Curve, RHDF2 Design Level 1
Model RHDF2 Performance Curve
Performace based on the following: elastomer fitted pump, flooded suction, water at ambient conditions.
The use of other materials and varying hydraulic conditions may result in deviations in excess of 5%.
10
20
30
BAR
100
7
6
5
4
HEAD
3
2
PSI
(17)
100 PSI (6.9 Bar)
90
80
80 PSI (5.5 Bar)
70
60
60 PSI (4.1 Bar)
50
40
40 PSI (2.8 Bar)
30
(34)
(51)
40
(68)
SCFM (M3/hr)
50 (85)
60 (102)
(119)70
20
1
20 PSI (1.4 Bar)
10
0
0
0 20 40 60 80 100 120 140 160 180
U.S. Gallons per minute
500400300200100
600
Liters per minute
CAPACITY
rhdf2dl1sm-rev0614 Model RHDF2 Page 3
Dimensions: RHDF2
Dimensions are ± 1/8"
Figures in parenthesis = millimeters
19.87
505
20.30
516
OPTIONAL
VERTICAL
SUCTION
PORT
8.48
215
1" NPT AIR INLET
17.68
449
SUCTION PORT
2" NPT
2.62
67
3/4" NPT EXHAUST
DISCHARGE PORT
2" NPT
2.57
65
9.81
249
.25
6
11.00
279
8.88
226
21.64
550
10.25
260
14.00
355
8X
.50
[13] MTG. HOLE
15.37
390
15.62
397
BOTH SUCTION AND DISCHARGE PORTS ARE
AVAILABLE WITH 2" BSP CONNECTIONS
24.29
617
2.62
67
rhdf2dl1sm-rev0614 Model RHDF2 Page 4
Important Installation Information
Use of the standard AODD Installation Guide is recommended for pumps
tted with AirVantage technology. Install shut-off valves on both the suction and
discharge of the pump. (This will help limit the amount of product that enters the center section
of the pump in the event of a diaphragm failure.) Using shut-off valves in conjunction with a drain
port also provides a means of allowing the lines to be drained when maintenance needs to
be conducted.
When the supply liquid level is above the air inlet of the pump, and a
diaphragm fails, the pumped liquid or fumes can enter the air end through
the point of failure. When a diaphragm failure is detected, it is best to close
the shut-off valves and bleed the lines of product. This will limit the ability
of the material being pumped to enter the AirVantage. Failure to do so may
result in damage to the AirVantage and air distribution components.
If a diaphragm failure has been detected in pumps
tted with AirVantage, the following procedure for
shut-down must be used:
1. Close the suction shut-off valve
(this will limit any new product from
entering the pump)
Shut O
Valve
2. Close the discharge shut-off valve
(this will stop any product from
reentering the pump)
3. Close the air supply shut-off valve
4. Drain the discharge line
5. Drain the suction line
6. Perform maintenance
Caution: When performing a direct spray washdown, a
plug must be installed in place of the AirVantage mufer.
Failure to do so may damage internal components.
(See page 23)
WARNING
In the event of diaphragm
rupture, pumped material
may enter the air end of the
pump, and be discharged
pumping a product which is hazardous or toxic,
the air exhaust must be piped to an appropriate
area for safe disposition.
into the atmosphere. If
Shut-O Valve
Suction Port
Dessicant Dryer
(Optional)
Unregulated Air
Supply to Tranquilizer
Filter Regulator
PN: 020.107.000
Vacuum
Gauge
Drain Port
Flexible
Connection
Suggested Installation Guide
Pipe Connection
(Style Optional
Flexible Connector
(Optional Piped Exhaust)
Flexible Connector
Pipe Connection
(Style Optional)
Muer
Drain Port
Note: Pipe weight should not be supported
by pump connections.
Warren Rupp Tranquilizer
Limited to 125 psi
(Optional)
Pressure Gauge
Shut-O Valve
Discharge Port
rhdf2dl1sm-rev0614 Model RHDF2 Page 5
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rhdf2dl1sm-rev0614 Model RHDF2 Page 6
PRINCIPLE OF PUMP OPERATION
This ball valve tted pump has been equipped with IDEX’s patented AirVantage equipment. To fully understand the
operation of the AirVantage, one must rst understand the basics of Air Operated Double Diaphragm (AODD) pumps.
AODD’s are powered by compressed air. The compressed air is directed behind each of the exible diaphragms by a
Main Air Valve. Once the diaphragm has reached the end of its stroke, a Pilot Valve is mechanically actuated, sending
an air signal back to the Main Air Valve which redirects air to the opposite diaphragm. This causes the diaphragm
assemblies, which are connected by a common Diaphragm Rod, to move in a reciprocating action.
Air is directed to the inboard side of the diaphragm, which is closest to the center of the pump. This is referred to
as the air side of the diaphragm. The opposite side is commonly called the uid side. Most AODD pumps have a 1:1
ratio design. This means, when the discharge of the pump is closed completely (dead headed), the maximum pressure
the pump will create will be equal to the air pressure being applied to the pump. At this point, and only at this point, the
diaphragm will be completely balanced. The air pressure is equivalent to the uid pressure and there will be no movement
of the diaphragm. If the pump is stroking, then the system is not balanced. There will be more pressure applied to the air
side than uid pressure on the uid side.
During each stroke of the pump there are two distinct operations that occur. One diaphragm is moving away from
the center of the pump, moving uid out of the Discharge Manifold, while the other diaphragm is moving toward the
center, bringing uid into the Suction Manifold. Considering that the pump has a common suction and discharge port,
these two operations are separated from each other through a series of Check Valves.
PRINCIPLE OF AIRVANTAGE
AirVantage is a special air side device which uses equipment that can accurately monitor the operation of the pump.
Based on the monitored information, air is metered to the correct amount to perform the work required, and
NOTHING MORE.
Once the pump starts up, and the AirVantage is turned on, the LED indicator light will go through a series of patterns.
Initially the light will be solid green. This indicates the AirVantage is allowing the pump to reach a steady state. Next,
the light will pulse at a very rapid rate. This is called the learn phase. Learn is where the AirVantage monitors the pump
in non-AirVantage mode. This will set the parameters for operation in AirVantage mode. In less than one minute, the
pump will change tones. The LED indicator light will start an uneven blink when optimization has started. Optimization
will be completed once the LED light is blinking in unison with the stroke rate of the pump. All this is completed without
sacricing a signicant amount of ow.
AIR LINE MOISTURE
Water in the compressed air supply can create problems such as icing and freezing of the exhaust air. The
formation of ice in the exhaust can cause the pump to cycle erratically, degrade efciency, or even stop the pump. Fitting
the pump with the AirVantage technology reduces the exhaust temperature. This is due to more energy being extracted
from every pulse of air. When more energy is extracted, the temperature of the air is reduced. Some method of air drying
will be necessary. Most refrigerant dryers installed on compressors can reduce the dewpoint to about 40° F. This is
normally adequate for most pumping applications. If further drying needs to occur due to internal ice build-up, a desiccant
dryer can be installed. These air line dryers can lower the dewpoint to around -40° F.
AIR VALVE LUBRICATION
The air valve and pilot valve are designed to operate without lubrication. There may be instances of personal
preference or when extremely dry air is being used (instrument quality or nitrogen) that a small amount of lubrication will
improve the life of the rubber components being used on the air side of the pump. The lubrication may be added using an
air line lubricator (¾” PN: 020.051.001 – 1” PN: 020.052.001). At the point of operation use SAE 10 weight, non detergent
oil at a maximum rate of 1 drop per hour for every 20 scfm (9.4 liters/sec) of air consumption. Consult the pump curve to
determine this value. The smallest amount needed is preferred.
AIR INLET AND PRIMING
To start the pump, make sure the AirVantage switch is in the off position. Increase the pressure until the pump starts
to cycle. The pump stroke rate should slow slightly when the pump is primed. Once the pump is fully primed, increase
the pressure at the regulator until the desired ow rate is achieved. Again, the pump curve can be used to derive this
value. If increasing the pressure to the pump does not generate a higher ow rate, then cavitation has occurred. Back the
regulator off slightly. To gain the most efciency from the pump, try to run the pump fully primed at all times.
BETWEEN USES
When the pump is being used to move materials that tend to settle out or solidify, the pump should be ushed to
prevent damage. The product that remains in the pump could dry and settle out. This could potentially cause damage
to the diaphragms and/or check valves during restart. In freezing temperatures the pump must be completely drained
between uses. Due to the addition of the new technology, it is recommended the air supply to the pump be shut off if the
pump is going to be shut down for an extended length of time.
INSTALLATION AND START-UP
The pump should be located near the product being pumped, in order to keep the suction line as short as possible.
Minimize the number of ttings between the product and the pump and maintain the line size, if possible. Better results
will always be realized if the line size of the suction line is increased by one size. It's not recommended to hook up
rigid pipe directly to the pump. Some method of expansion joint or vibration isolator should be used. A Warren Rupp
Tranquilizer
the level of the pump, a pressure regulating device may need to be added to the exhaust of the pump (Consult the factory
for recommendations).
®
is recommended to reduce the pulsation in the ow. If the uid level is more than 10 feet (3 meters) above
AIR SUPPLY
The air supply pressure cannot exceed 125 psi (8.6 bar). The air line and associated components (lters,
regulators, solenoid valves, etc.) should not be less than ½” (13 mm). However, 3/4" (19mm) or greater is preferred. An
air line lter-regulator is necessary for the AirVantage installation. The required component (PN: 020.107.000) is available
through the distributor. Rigid pipe should not be hooked directly to the air inlet of the AirVantage. A exible hose should be
installed to reduce the strain. Do not let the weight of the air line components be supported by the air inlet of the pump.
Failure to provide a means of supporting the weight may result in damage to the pump. If the pump will be shut down for
any extended length of time, it is recommended that the air supply to the pump should be shut off.
rhdf2dl1sm-rev0614 Model RHDF2 Page 7
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rhdf2dl1sm-rev0614 Model RHDF2 Page 8
PUMP TROUBLESHOOTING
CAUTION! WHENEVER TROUBLESHOOTING OR PERFORMING ANY
REPAIRS ON ANY WARREN RUPP, INC. EQUIPMENT, ALWAYS REMOVE
THE AIR SUPPLY LINE TO THE PUMP AND WEAR PROPER PERSONAL
PROTECTIVE EQUIPMENT.
PUMP WILL NOT CYCLE
What to Check: • The system head exceeds the air supply pressure to the pump.
Corrective Action: • Increase the air inlet pressure to the pump. Most diaphragm pumps are
designed for 1:1 pressure at zero ow.
What to Check:• Check ESADS+, including pilot valve assembly and main air valve assembly.
Corrective Action: • Disassemble and inspect the main air distribution valve, pilot valve, and
pilot valve actuator pins. Check for scores, wear, or damaged o-rings. Replace parts as necessary.
Refer to the exploded view drawing and air valve section (P.18 & 20).
What to Check: • Blocked discharge line.
Corrective Action: • Check for obstruction or closed discharge line.
What to Check: • Blocked pumping chamber.
Corrective Action: • Disassemble and inspect wetted chambers of the pump. Remove or ush
any obstructions. Refer to page 14 for disassembly.
PUMP CYCLES, BUT WILL NOT FLOW OR FLOW RATE IS UNSATISFACTORY
What to Check: • Restricted or undersized air line.
Corrective Action: • Make sure there are no obstructions or restrictions in the air inlet to the
pump. Install proper size air line and/or air line equipment. Refer to air supply section (p.7) air inlet
plumbing recommendations.
What to Check: • Restricted or undersized suction piping.
Corrective Action: • Make sure there are no obstructions or restrictions in the suction line or
related suction components such as screens or strainers. Install the proper size suction line and/
or equipment. It is recommended that any suction line components and pipe size be at least the
same size as the suction line thread size to the pump. Though best results will always be realized
if the line size of the suction line is increased by one size. Refer to the installation section (p.5) for
recommended suction plumbing recommendations.
What to Check: • Excessive Suction Lift.
Corrective Action: • For lifts exceeding 20 feet (6 meters), lling the pump chambers with liquid
will prime the pump in most cases. If not, place pump closer to uid level.
What to Check: • Suction line cavitation.
Corrective Action: • If no obstructions are in the suction line of the pump, decrease the inlet
air pressure and/or volume to the pump. This will slow down the diaphragm speed and reduce the
cavitation.
What to Check: • Partially blocked exhaust mufer.
Corrective Action: • Remove mufer and make sure that some of the material being pumped has
not migrated into the mufer element. If it has, replace the element or clean it and reinstall. If product
has made it to the mufer, then the diaphragm assembly will need to be inspected. Refer to the
Diaphragm Replacement section (p.15).
What to Check: • Suction side air leakage or air in the product.
Corrective Action: • Visually inspect all suction side gaskets, seals, as well as pipe and pipe
connections.
PUMP CYCLE SEEMS UNBALANCED OR PRODUCES EXCESSIVE VIBRATION
What to Check: • Excessive ooded suction in system.
Corrective Action: • Check height of uid above pump. For ooded conditions, exceeding 10 feet
(3 meters) of liquid, install a back pressure device in the exhaust side of the pump.
What to Check: • Worn or misaligned check valve or check valve seat.
Corrective Action: • Disassemble the wet end of the pump and inspect check valves and seats
for wear and proper seating. Replace them if necessary. Refer to the Check Valve section (p.15) for
disassembly instructions.
What to Check: • Obstructed check valves.
Corrective Action: • Disassemble the wet end of the pump and look for obstructions that may
prevent the check valve from seating on the seat. Look for damage on the valve and the seat. Replace
them as necessary. Refer to the Check Valve section for disassembly (p.15).
What to Check: • Rigid pipe connections.
Corrective Action: • Install exible pipe isolators or expansion joints between the plumbing and
the pump.
What to Check: • Blocked air exhaust mufer.
Corrective Action: • Remove mufer, clean or de-ice and reinstall.
rhdf2dl1sm-rev0614 Model RHDF2 Page 9
What to Check: • Pulsation in the discharge line.
Corrective Action: • Excessive pulsation in the discharge line may be corrected by installing a
Warren Rupp Tranquilizer Surge Suppressor.
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