Gardner Denver WELCH 2567B-01 User manual

OWNER’S MANUAL
FOR
DRY VACUUM PUMP
MODELS: 2567B-01, 2567B-50, 2567C-02, 2567C-50
Warning
Not recommended for pumping acid, base or organic vapors or gases
Warning
Be sure to properly identify intake and discharge before using pump.
See section 2.5
Part No. 642828A 7/01/20
Printed in USA

INSTRUCTION
WARNING AND CAUTION
PLEASE READ BEFORE OPERATION
While reading your manual, please pay close attention to areas labeled:
WARNING AND CAUTION.
The description of each is found below.
WARNING
Warnings are given where failure to observe instruction could result in
injury or death to people
CAUTION
Cautions are found where failure to observe the instruction could result
in damage to the equipment, associated equipment and process
These units conform to the SI International system of units of measurement.
The following symbols (with recommendation of IEC1010 ) of warning will be found on the pump.
Caution - Refer to accompanying documents
Caution - Risk of electrical shock
Caution - Hot surface
WARNING
Motor includes a self resetting thermal cutout and the pump could restart
without actuation under fault condition
2

TABLE OF CONTENTS
Section 01 - Safety Information
1.10 Warning to prevent injury
1.20 Warning to reduce risk of electrical shock
1.23 Warning to reduce risk of electrocution
1.27 Warning to reduce risk of explosion or •re
Section 02 - Installation
2.10 Introduction
2.11 Unpacking
2.12 Pump mounting
2.13 Pump location / Environmental conditions
2.14 Intake and discharge provisions
2.20 Electrical power
2.28 Vacuum connections
2.29 Vacuum gauges
2.30 Traps
Section 03 - Operation
3.10 Starting procedures
3.13 Leak detection
3.14 Pressure range
3.15 Shutdown procedures
Section 04 - Maintenance
Section 05 - Troubleshooting
5.10 Vacuum problems
5.11 Troubleshooting Guide
Section 06 - Speci•cations
6.10 Speci•cation chart
6.11 Pumping speed curve
6.12 Dimensional Drawing
6.13 Parts list and exploded View
Section 07 - Application Information
7.20 Vacuum System for Applications
7.21 System Components
Section 08 - Warranty
3

4
Section 1: SAFETY INFORMATION
1.10 CAUTION: To prevent injury....
1.11 Never operate this product if it has a damaged cord or plug. If it is not working properly, has
been dropped, damaged or has fallen into water, please return the product to a Welch service
center for examination and repair.
1.12 Keep the cord away from the heated surfaces.
1.13 Never block any air openings or place it on a soft surface where the openings may be blocked.
The air openings are for ventilation of the motor inside the housing. Keep all air openings free
of lint, dirt and other foreign objects.
1.14 The PTFE pump is thermally protected and can automatically restart when the protector resets.
Always disconnect power source before servicing.
1.15 Wear safety glasses or goggles when operating this product.
1.16 Use only in well ventilated areas. The motor is fan cooled enclosed in a shell.
WARNING
Do not operate the pumps in an atmosphere containing !ammable or
explosive gases/vapors
WARNING
Never block the exhaust port. If the exhaust is blocked, pressure will
build-up in the pump with the potential of the pump head bursting and
causing possible injury to personnel in the area
1.17 All electrical products generate heat. To avoid serious burns never touch unit during or
immediately after operation.
1.18 Be sure to properly identify intake and discharge before using pump. See Section II-5.
1.20 CAUTION: To reduce risk of electrical shock....
1.21 Do not disassemble. Disassembly or attempted repairs if accomplished incorrectly can create
electrical shock hazard. Refer servicing to quali"ed service agencies only: Call [phone]
1.22 Unit is supplied with a three pronged plug. Be sure to connect pump to a properly grounded
outlet only.
1.23 WARNING: To reduce risk of electrocution…
1.24 Do not use this product in or near area where it can fall or be pulled into water or other liquids.
1.25 Do not reach for this product if it has fallen into liquid. Unplug immediately.
1.26 Never operate this product outdoors in the rain or in a wet area.
1.27 DANGER: To reduce risk of explosion or "re…
1.28 Do not use this pump near explosive atmospheres or where aerosol (spray) products are being
used.
1.29 Do not use this product near !ames.
WARNING
Failure to observe the above safety precautions could result in severe
bodily injury, including death in extreme cases

5
Section 2: INSTALLATION
2.10 Introduction
This manual has been compiled not only for the care and maintenance of the Welch Dry
Vacuum System now in your possession, but as a helpful reference and guide to prevent many
problems which can occur if used improperly.
2.11 Unpacking
Carefully remove the Dry Vacuum System from the shipping carton. Preserve all paperwork for
future reference. If damage has occurred from shipment a claim must be •led with the carrier
immediately; preserve the shipping carton for inspection by the carrier. If you are required to
communicate with your dealer or Welch Vacuum be sure to include your order numbers for
quick identi•cation. Do not return the system to the factory without •rst calling for a returned
goods number. Call [phone].
2.12 System Mounting
Rubber feet are attached to the pump. Rubber feet are excellent for applications involving a
semi-•exible surface such as a bench top; they help to isolate noise and eliminate creeping.
2.13 System Location and Environmental Condition
The Dry Vacuum System should be located in a clean, dry and well ventilated area. Do not to
block the ventilation ports located on the metal shell. The pump should be placed where the
surrounding temperature remains between 10°C and 40°C (50°F and 104°F). Always check
to insure the location chosen is protected from direct or indirect moisture contact. The pump
should be located as closely to its system as possible in order to utilize it most e•ciently. The
pump is rated for indoor use only. Maximum altitude 2000 meters. Operating temperature
range 5°C to 40°C. Maximum relative humidity of 80% for temp up to 31°C decreasing to 50%
at 40°C. Rated for ±10% of supply voltage. Pollution Degree2, Installation Category II.
WARNING
Don’t operate this pump in an atmosphere containing •ammable or
explosive gases or vapors
WARNING
The motor is thermally protected and will automatically restart
unexpectedly when the overload device resets
2.14 Inlet and Outlet Provisions
A inlet hose barb which accepts 3/8” I.D. hose makes it easy to connect the system to your
concentrator, rotary evaporator or gel dryer. Since the vacuum system operates in the viscous
•ow regime, the small diameter of the hose will generate minimal conductance loss. For best
results, Welch recommends the length of the tubing between the pump and the apparatus be
kept as short as possible. Hose clamps should be used to hold the hose in place. The hose
barb in the outlet port of the pump accepts 3/8” ID hose. A vent line can be attached to the
outlet hose barb which allows gases and vapors pumped through the pump to be piped to a
fume hood. Be sure to call Welch technical service prior to start-up at [phone] if you
have any questions.
WARNING
Never Block The Outer Port. If the outlet is blocked, pressure will
buildup in the pump which can lead to the pump head bursting creating
the potential of serious injury. Remove plug from outer port

6
2.20 Electrical Power
2.21 Power Source Review
Review the power source and the voltage rating on the units serial number tag to be sure
they agree in voltage, phase and frequency. Serious damage may occur to the system if it is
connected to an improper voltage. All Welch systems must be grounded. Grounding reduces
the risk of electric shock in the event of an electrical short circuit. The plug must be plugged
into an outlet properly grounded. Consult your local electrical codes if you have doubts.
2.22 Overload Protection
The motor manufacturer makes motor thermal overload protection available as an aid to
minimize motor failure. Overload protection is a standard feature on both 50/60Hz single-
phase motors. The motors have automatic overload protection. Automatic reset protection is
designed to reset itself after a predetermined cooling period. If the fault to the drive remains
unaltered, the motor will cycle on and off until fault is corrected.
2.23 Identification Symbols:
Power Off Power On
2.24 Grounding Instructions
This product should be grounded. In the event of an electrical short circuit, grounding reduces
the risk of electric shock by providing an escape wire for the electric current. This product
is equipped with a cord having a grounding wire with a grounding plug. The plug must be
plugged into an outlet that is properly installed and grounded in accordance with all local codes
and ordinances. This adapter shown in Figure B and Figure C is not acceptable in Canada.
DANGER
Improper installation of the grounding plug can result in a risk of
electrical shock
If repair or replacement of the cord or plug is necessary, do not connect the grounding wire to
either flat blade terminal. The wire with insulation having an outer surface that is green with or
without yellow stripes is the grounding wire. Check with a qualified electrician or serviceman
if the grounding instructions are not completely understood, or if in doubt as to whether the
product is properly grounded. Do not modify the plug provided; if it will not fit the outlet, have
the proper outlet installed by a qualified electrician.

7
This product is for use on a nominal 120V circuit, and has a grounding plug that looks like the
plug illustrated in Sketch A in Figure #1. A temporary adapter, which looks like the adapter
illustrated in sketches Band C, may be used to connect this plug to a 2-pole receptacle as
shown in sketch B if a properly grounded outlet is not available.
The temporary adapter should be used only until a properly grounded outlet (Sketch A) can
be installed by a quali•ed electrician. The green colored rigid ear, lug, etc. extending from the
adapter must be connected to a permanent ground such as a properly grounded outlet box
cover. Whenever the adapter is used, it must be held in place by a metal screw.
2.25 Extension Cords
If necessary to use an extension cord, use a 3-wire extension cord that has a 3-blade
grounding plug, and a 3-slot receptacle that will accept the plug on the product. Make certain
your extension cord is in good condition. Make certain your extension cord wire size is not less
than 18 gauge for 25 feet, 16 gauge for 50 feet, and 14 gauge for 100 feet. An undersized cord
will cause a drop in line voltage resulting in loss of power and overheating. If in doubt, use the
next heavier cord. The smaller the gauge number, the heavier the cord.
2.26 Dial Vacuum Gauge
A dial vacuum gauge is incorporated in the vacuum system. The dial gauge is located in the
top front section of the system. The dial vacuum gauge is commonly used to indicate vacuum
level when operating in the rough vacuum range (0 to 29.9 InHg) Dial vacuum gauges give
negative pressure - that is pressure below atmospheric. The reference point for the gauges
is atmospheric pressure. Please keep in mind that atmospheric pressure tends to vary from
day to day. As a result of this variability, a dial vacuum gauge will indicate slightly di•erent
maximum vacuum readings from day to day.
2.27 Vacuum Level Regulation
Vacuum level regulation is accomplished with an adjustable bleed valve. The adjustable bleed
valve allows close control of pressure in your apparatus. Pressure may be set between roughly
atmospheric pressure and the maximum vacuum obtainable (9 torr, 29.6 InHg).
2.28 Vacuum Connections
All Dry Vacuum Pumps come with intake and discharge hose barbs which accept 3/8” ID
rubber pressure/vacuum hose. Hose clamps should be used to hold the hose in place. Since
all six models operate in the viscous •ow range, the small diameter of the hose will generate
minimal conductance loss. For best results, Welch recommends the length of the tubing
between the pump and the chamber be kept as small as possible.
2.29 Vacuum Gauges
Typical in the rough vacuum range, a dial vacuum gauge is used to measure pressure in mm,
Hg or inches of Hg. The dial vacuum gauge gives negative pressure – that is pressure below
atmospheric. The reference point for the vacuum gauge is atmospheric pressure. Please keep
in mind that atmospheric pressure tends to vary from day to day. As a result of variability, the
dial vacuum gauge will indicate slightly di•erent maximum vacuum readings from day to day.

8
2.30 Traps
2.31 The need for a Trap
The pumps will handle humid air. All wetted aluminum parts are treated for corrosion protection
from moisture. All other wetted parts are stainless steel. If there is a chance liquid may be
drawn from the process under evacuation, Welch recommends a liquid trap be placed between
the process and the pump. A simple liquid trap is a •ltering •ask.
When a heavy load of water vapor is evolved from the vacuum process, a cold trap is
recommended to help prevent damage to the pump mechanism. The cold trap, immersed in a
suitable Dewar •ask, is installed so that the water vapor may come in contact with the surfaces
of the trap and condense. Commonly used refrigerants are liquid nitrogen or dry ice and
acetone or alcohol. Dry ice provides su•cient cooling to freeze out most heavy water vapor
loads. A variety of cold traps are available from Welch.
The symptom of a high water vapor load is if you have droplets coming out of the exhaust
port. If you see droplets of water, Welch recommends you use a cold trap to capture the water
before entering the pump or dilute the water vapor stream by adding dry nitrogen to the gas
•ow. Please call our customer service department for additional information at [phone].
2.32 The care of a Trap
When using a cold trap the refrigerant should be maintained at a high level in the •ask to keep
the trap at a uniformly low temperature. If the trap is re-warmed it may allow re-evaporation of
the condensate. The refrigerant add tube on the liquid nitrogen trap should not be obstructed
as the refrigerant boil-o• can produce dangerously high pressures. If the trap becomes
saturated it should be disconnected from the system, drained and cleaned. An increase in
pressure in the vacuum system will normally indicate that the trap has become saturated. To
clean the trap, remove the trap from the system and allow the trap to warm up and rinse o• the
condensate with a suitable solvent in a fume hood. Thoroughly clean and dry the trap before
reinstalling into the system.

9
Section 3: OPERATION
3.10 Starting Procedures
3.11 Starting a Welch Dry Vacuum Pump
Before attaching the pump to a system it is well to familiarize yourself with the function and
action of the pressure vacuum pump that you have acquired. Review the power requirements
as described in Section 2.6. Welch recommends running the pump for a few minutes to warm
up before use. The warm-up improves the pump’s ability to handle humid air.
3.12 Cleanliness
Take every precaution to prevent foreign particulates from entering the pump. Particulates will
damage the pump’s performance. If you •nd that particulates will come o• the process during
evacuation, a particle trap in the foreline will work. A simple, inexpensive trap may be made by
placing glass wool in a glass or plastic tube. Screens must be inserted to hold the glass wool in
place.
WARNING
The Pump is not recommended for pumping acid, base or organic
vapors or gases. Serious damage to the pump will shorten the pump’s
service life. In addition, pumping !ammable vapors or gases can lead to
serious safety hazard leading to •re or explosion
3.13 Leak Detection
The importance of eliminating all leaks in a vacuum system is obvious. The pump must remove
this added volume of leaked gas to maintain the desired vacuum. Leaks for these pumps can
be located by slightly pressuring the system and painting the suspected area with a thick soap
solution. Escaping air will produce soap bubbles.
3.14 Operating Pressure Range
Model 2581 Dry Vacuum Pumps are designed to be run from atmospheric to their maximum
vacuum level on the intake side. Consult the Speci•cation Table in the back of this manual for
the ratings for your speci•c model.
3.15 Shutdown Procedures
After use, Welch recommends the pump be run for about 2 minutes disconnected from the
vacuum process. The air pumped through the mechanism will purge out water vapor or
droplets of water condensate that may have formed on the inside of the pump. This purge of
the pump mechanism helps prevent corrosion.
Section 4: MAINTENANCE
Welch dry pressure \ vacuum units are 100% oil-free. The pump employs a non-lube piston
and cylinder. No maintenance is necessary for the bearings. All bearings are sealed and
permanently lubricated. Lubrication should not be attempted. The units are built for continuous
duty operation with the quietness and durability of a diaphragm, but with piston performance.

10
Section 5: TROUBLESHOOTING
5.10 Vacuum Problems
Leakage, contamination and unusual outgassing are the general causes of problems with poor
vacuum. To operate at maximum efficiency a system must be thoroughly clean. If the system is
completely clean and free from leaks, and unwarranted vacuum problems still exist, the pump
should be checked. A simple criterion for the condition of the pump is the determination of its
maximum vacuum capability. This can be accomplished by blocking of the intake and reading
the vacuum level on the gauge (See Section 2.8).
5.11 Troubleshooting Guide
Poor
Pumping
Speed
Poor
Vacuum
Loud
Unit Possible Cause Corrective Action
X X X Damaged valves Replace flapper valves
X X X Debris in valves Remove debris and check for valve damage
X X X Damaged gasket Replace gasket
X X X Loose head screw Tighten head screw
X X X Loose fitting Tighten fitting
X X X Restricted Muffler Clean/Replace Muffler

11
Section 6: SPECIFICATION
6.10 Pump Speci•cation Chart
Welch Model 2567
Free Air Displacement
CFM (L/min.) @60Hz 4.5 (128)
M3 (L/min.) @50Hz 6.4 (107)
Ultimate Pressure
Torr 60
(mbar) (80)
Maximum Vacuum InHg. 27.6
Motor Horsepower
Horsepower 1/3
(watts) (250)
Tubing needed
I.D. in Inches (Millimeters) 3/8 (10)
Intake & Exhaust Thread NPT 3/8
Weight lbs (Kg.) 16.5 (7.5)
Overall Dimensions
L in Inches (cm) 17.0 (43.2)
W in Inches (cm) 7.5 (19.1)
H in Inches (cm) 12.0 (30.5)
Shipping Weight
lbs (Kg.) 24 (10.9)
Shipping Dimensions
L in Inches 21.5
W in Inches 12.5
H in Inches 16
Catalog Number
Catalog Number Wired for 115V, 60Hz, 1Ph with N.
American Plug
2567B-01
Catalog Number with Trap and Gauge Wired for 115V, 60Hz,
1Ph with North American Plug
2567B-50
Catalog Number with IEC/Euro Cord Wired for 230V,
50/60Hz, 1Ph with UK Plug
2567C-02
Catalog Number with IEC/Euro Cord, Trap and Gauge,
Wired for 230V, 50/60Hz, 1Ph with UK Plug
2567C-50

12
6.11 Pumping Speed Curves

13
6.12 Dimensional Drawing
(244.0)
CORD ASSY
8.25
4X 8-32 UNC-2B THRU
7.09
6.67
9.45
INTAKE NIPPLE
FOR 3/8" TUBING
MUFFLER
11.67
OUTLET
INLET
(182.6)
3.50 5.38
7.19
(296.4)
(240.0)
(209.5)
9.61
(180.0)
(169.4)
(88.9) (136.6)

14
6.13 Parts List and Exploded View for Pump Model 2567B-50, 2567C-50, 2567B-01, 2567C-02.
Note 1: Parts available in kits shown in the following last three columns.
Item
Number Qty. Part No. Description
Service Kit Seal Kit Suction Foot
Kit
2567K-03 2567K-04 2500K-04
1 2 2567K-01 Connecting Rod Assembly 2 - -
2 2 2567K-02 Valve Plate Ass’y 2 - -
3 2 * O-Ring Cylinder 2 2 -
4 2 * O-Ring Valve Plate 2 2 -
5 1 1412C Exhaust Muffler 2 - -
6 6 * Head Screw 6 - -
7 4 2500K-04 Rubber Suction Feet - - 4
8 2 * Cup Retainer Screw 2 - -
9 2 * Piston Cup 2 2 -
10 2 * Handle Screw 2 2 -
* Parts not available separately but included in kits.
1
2
3
4
56
7
8
9
10

15
Section 7: APPLICATION INFORMATION
7.20 Vacuum System for Vacuum Chamber, Glove Box, Annular Space, Transfer Line & Cell
Harvesting:
- 2567B-01 - 2567C-02
- 2567B-50 - 2567C-50
7.21 System Components* available as kit Cat. No. 2565K-50, vacuum regulator with separator jar.
Qty. 2565K-50 Description for regulator / separator jar
1 * Jar Assembly
1 * Needle Valve Miniature
1 * Instrument Knob
1 * Hose Barb, 3/8” NPT
1 * Hose Barb Fitting
1 * Hose Barb, Male Straight Kynar
1 726021 Vacuum Gauge InHg.
1 * Jar Gasket
1 1415D Plastic Jar
1 * Hex Nipple

Welch Vacuum by Ingersoll Rand
1601 Feehanville Drive, Ste 550
Mount Prospect, IL 60056
Phone: [phone] (Technical Support)
Fax: [phone]
E-Mail: [e-mail]
Web-Page: www.welchvacuum.com
Copyright© 1997-2007 Gardner Denver Welch Vacuum Technology, Inc.
Welch is registered trademarks of Gardner Denver
Section 8: WARRANTY
This Welch Vacuum product is warranted to be free from defects in material and workmanship. This
liability of Welch-Ilmvac under this warranty is limited to servicing, adjusting, repairing, or replacing
any unit or component part which in the judgment of Welch-Ilmvac has not been misused, abused,
or altered in any way or damaged by ingestion of foreign material causing impaired performance
or rendering it inoperative. No other warranties are expressed or implied. The method of executing
this warranty: servicing, adjusting, repairing, or replacing, shall be at the discretion of Welch-Ilmvac.
Vacuum pumps that have been operated within a vacuum system, or other system, for any period,
however short, will be repaired under this warranty rather than replaced.
The warranty is effective for one year from the date of original purchase when:
1. The warranty card has been completed and returned.
2. The product is returned to the factory or other designated service centers, freight prepaid.
3. The product in our judgment is defective through no action or fault of the user.
If the product has become defective through misuse, abuse, alteration, or ingestion of foreign
material, repairs will be billed regardless of the age of the product. In this event, an estimate of the
repair costs will be submitted and authorization of these charges will be required before the product is
repaired and returned.