Graymills DDP-375 User Manual
Graymills
POLYPROPYLENE
Air Operated
Double Diaphragm Pumps
3/8" Model
Air Valve Service Instructions
100 psi (0.7 MPa, 7 bar) Maximum Fluid Working Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Input Pressure
795–90923
GM 3-07
Polypropylene Pumps, Series E
US and Foreign Patents Pending
WARNING/CAUTIONS
Read all these SAFETY INSTRUCTIONS
BEFORE installing or using this equipment. Keep this manual handy for reference/training.
01428B
TI2194A
Graymills Corporation 3705 N. Lincoln Avenue Chicago, Illinois 60613
773/248–6825 FAX 773/477–8673 www.graymills.com
WARNING
EQUIPMENT MISUSE HAZARD
Any misuse of the equipment or accessories, such as overpressurizing, modifying parts, using incompatible
chemicals and fluids, or using worn or damaged parts, can cause them to rupture and result in splashing in
the eyes or on the skin, other serious injury, or fire, explosion or property damage.
D This equipment is for professional use only. Observe all warnings. Read and understand all instruction
manuals, warning labels, and tags before you operate this equipment. If you are not sure, or if you have
questions about installation or operation, call Graymills Corporation.
D Never alter or modify any part of this equipment; doing so could cause it to malfunction.
D Check all equipment regularly and repair or replace worn or damaged parts immediately.
D Never exceed the recommended working pressure or the maximum air inlet pressure stated on your pump
or in the Technical Data on page 4.
D Do not exceed the maximum working pressure of the lowest rated component in your system. This
equipment has a 100 psi (0.7 MPa, 7 bar) maximum working pressure at 100 psi (0.7 MPa, 7 bar, )
maximum incoming air pressure.
D Be sure that all fluids and solvents used are chemically compatible with the wetted parts shown in the
Technical Data on page 4. Always read the manufacturer’s literature before you use fluid or solvent in
the pump.
D Never move or lift a pump under pressure. If dropped, the fluid section may rupture. Always follow the
Pressure Relief Procedure on page 11 before you move or lift the pump.
FIRE AND EXPLOSION HAZARD
Static electricity is created by the flow of fluid through the pump and hose. If the equipment is not properly
grounded, sparking may occur. Sparks can ignite fumes from solvents and the fluid being pumped, dust
particles, and other flammable substances, whether you are pumping indoors or outdoors, and can cause a
fire or explosion and serious injury and property damage.
D To reduce the risk of static sparking, ground the pump and all other equipment used or located in the
work area. Check your local electrical code for detailed grounding instructions for your area and type of
equipment. See Grounding on page 6.
D If you experience any static sparking or even a slight shock while using this equipment, stop pumping
immediately. Check the entire system for proper grounding. Do not use the system again until you have
identified and corrected the problem.
D Pipe and dispose of the exhaust air safely, away from all sources of ignition. If the diaphragm fails, the
fluid is exhausted along with the air. See Air Exhaust Ventilation on page 10.
D Do not smoke in the work area. Do not operate the equipment near a source of ignition or an open flame,
such as a pilot light.
3
SAFETY PRECAUTIONS
CAUTION
D Verify the chemical compatibility of the pump wetted parts and the substance being pumped, flushed or
recirculated. Chemical compatibility may change with temperature and concentration of the chemical(s)
within the substance being pumped, flushed or recirculated.
D The pump should not be used for the structural support of the piping system. Be certain system compo-
nents are properly supported to prevent stress on the pump parts.
D Do not allow pump to operate dry for long periods of time; this may cause unnecessary wear or damage
to the pump.
D Maximum temperature limits are based upon mechanical stress only. Certain chemicals will significantly
reduce maximum safe operating temperatures. Consult Graymills for chemical compatibility and temperature limits.
United States Government safety standards have been adopted under the Occupational Safety and Health Act. You should
consult these standards—particularly the General Standards, Part 1910, and the Construction Standards, Part 1926.
Technical Data For Pumps with Teflonr Diaphragms
Maximum fluid working pressure 100 psi (0.7 MPa, 7 bar). . . . . .
Air pressure operating range . . . 20 to 100 psi (0.14 to 0.7 MPa, .
1.4 to 7 bar ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum air consumption 5.5 scfm (see chart). . . . . . . . . . . . . .
Maximum free flow delivery 6.5 gpm (24.6 lpm). . . . . . . . . . . . .
Maximum pump speed 330 cpm. . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum suction lift 7 ft (2.1 m) dry, 12 ft (3.7 m) wet. . . . . . . .
Maximum size pumpable solids 1/16 in. (1.6 mm). . . . . . . . . . . .
Sound power level,
at full flow at 100 psi (0.7 MPa, 7 bar) 85 dBa. . . . . . . . . . . . .
Sound power level,
at 70 psi (0.48 MPa, 4.8 bar) and 1 gpm (3.8 lpm) 78 dBa. . .
Operating temperature range 40 to 150_ F (4.4 to 65.5_ C). . . . . . . .
Air inlet size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4 npt(f)
Fluid inlet and outlet size . . . . . . . . . . . . . . . . . . . 3/8” npt(f)
Wetted parts vary by models See pages 28 and 30. . . . . . .
Non-wetted external parts polyester (labels) glass–filled. .
polypropylene with conductive SST fibers
Weight (approximate) . . . . . . . . . . . . . 4.75 lb (2.2 kg). . . . .
Sound power level measured per ISO standard 9614–2.
VitonR, Teflon
DuPont Co.
Loctite
r is a registered trademark of the Loctite Corporation.
Santoprener is a registered trademark of the Monsanto Company.
Technical Data For Pumps with Hytrelr Diaphragms
Maximum fluid working pressure . . . . 100 psi (0.7 MPa, 7 bar)
Air pressure operating range . . . . 20 to 100 psi(0.14 to 0.7 MPa,
. . . . . . . . . . . . . . . . . . 1.4 to 7 bar). . . . . . . . . . . . . . . . . . . . . . .
Maximum air consumption . . . . . . . . . . . . 5.5 SCFM (see chart)
Maximum free flow delivery . . . . . . . . . . . . . 7 gpm (26.5 lpm)
Maximum pump speed . . . . . . . . . . . . . . . . . . . . . 330 cpm. . . .
Maximum suction lift 12 ft (3.7 m) dry; 21 ft (6.4 m) wet. . . . .
Maximum size pumpable solids . . . . . . . . . . . .1/16 in. (1.6 mm)
Sound power level,
at full flow at 100 psi (0.7 MPa, 7 bar) . . . . . . . . . . . . . 85
dBa
Sound power level,
at 70 psi (0.48 MPa, 4.8 bar) and 1 gpm (3.8 lpm) . . 78 dBa
Operating temperature range. 40 to 150_ F (4.4 to 65.5_ C)
Air inlet size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4 npt(f)
Fluid inlet and outlet size. . . . . . . . . . . . . . . . . . . . .3/8 npt(f)
Wetted Parts vary by model. . . . . . . . . See pages 27 and NO TAG.
Non-wetted external parts polyester (labels) glass–filled. .
polypropylene with conductive SST fibers
Weight (approximate) . . . . . . . . 4.75 lb (2.2 kg). . . . . . . . . . . . .
Sound power level measured per ISO standard 9614–2.
VitonR, Teflon
DuPont Co.
Loctiter is a registered trademark of the Loctite Corporation.
Santoprene
pany.
r, and Hytrelr are registered trademarks of the
r, and Hytrelr are registered trademarks of the
r is a registered trademark of the Monsanto Com-
4
Maintenance
Lubrication
The air valve is designed to operate unlubricated, however
if lubrication is desired, every 500 hours of operation (or
monthly) remove the hose from the pump air inlet and add
two drops of machine oil to the air inlet.
CAUTION
Do not over-lubricate the pump. Oil is exhausted
through the muffler, which could contaminate your
fluid supply or other equipment. Excessive lubrication
can also cause the pump to malfunction.
Flushing and Storage
WARNING
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the Pres-
sure Relief Procedure on page 11.
Flush the pump when necessary to prevent the fluid you are
pumping from drying or freezing in the pump and damaging it. Use a compatible solvent.
Tightening the Clamps
When tightening the clamps (111), apply thread lubricant to
the bolts and be sure to torque the nuts (113) to 50 to 60
in-lb (5.6 to 6.8 N-m). See Fig. 9.
Apply thread lube and torque nuts to 50 to 60
1
In-lb (5.6 to 6.8 N.m)
111
1113
Before storing the pump, always flush the pump and
relieve the pressure.
Tightening Threaded Connections
Before each use, check all hoses for wear or damage, and
replace as necessary. Check to be sure all threaded connections are tight and leak-free.
The recommended frequency for retorquing of fasteners
varies with pump usage; a general guideline is to retorque
every two months.
Fig. 9
01446B
Preventive Maintenance Schedule
Establish a preventive maintenance schedule, based on the
pump’s service history. This is especially important for
prevention of spills or leakage due to diaphragm failure.
14
Operation
Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually relieved to prevent the system from starting or spraying accidentally.
To reduce the risk of an injury from accidental spray
from the gun, splashing fluid, or moving parts, follow
the Pressure Relief Procedure whenever you
D Are instructed to relieve the pressure
D Stop spraying
D Check or service any of the system equipment
D Install or clean the spray tips
1. Shut off the air to the pump.
2. Open the dispensing valve, if used.
3. Open the fluid drain valve to relieve all fluid pressure,
having a container ready to catch the drainage.
Flush the Pump Before First Use
1. Be sure the pump is properly grounded. Read FIRE
OR EXPLOSION HAZARD on page 3.
2. Check all fittings to be sure they are tight. Be sure to
use a compatible liquid thread sealant or Teflonr tape
on all male threads. Tighten the fluid inlet and outlet
fittings snugly. Do not overtighten the fittings into the
pump.
3. Place the suction tube (if used) in the fluid to be
pumped.
4. Place the end of the fluid hose (N) into an appropriate
container. Close the fluid drain valve (J).
5. With the pump air regulator (H) closed, open all
bleed-type master air valves (B, E).
6. If the fluid hose has a dispensing device, hold it open
while continuing with the following step. Slowly open
the air regulator (H) until the pump starts to cycle.
Allow the pump to cycle slowly until all air is pushed
out of the lines and the pump is primed.
The pump was tested in water. If the water could contaminate the fluid you are pumping, flush the pump thoroughly
with a compatible solvent. Follow the steps under Starting
and Adjusting the Pump.
Starting and Adjusting the Pump
WARNING
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can cause
serious injury or death if splashed in the
eyes or on the skin, inhaled, or swallowed.
Do not lift a pump under pressure. If dropped, the fluid
section may rupture. Always follow the Pressure Relief
Procedure above before lifting the pump.
If you are flushing, run the pump long enough to
thoroughly clean the pump and hoses. Close the air
regulator. Remove the suction tube from the solvent
and place it in the fluid to be pumped.
Pump Shutdown
WARNING
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the Pres-
sure Relief Procedure at left.
At the end of the work shift, relieve the pressure.
11
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