Kobelt 3329 Instruction Manual

3329 Relay Valve
Owner’s Operation, Installation &
Maintenance Manual

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NOTES:
RECORD DATA BEFORE INSTALLATION FOR FUTURE REFERENCE
Model #:
Serial #:
Date of Purchase:
Date of Installation:

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Table of Contents
1Introduction ..................................................................................................................3
1.1 Contact ...................................................................................................................................... 3
1.2 Safety......................................................................................................................................... 3
1.2.1 Safety Alerts .......................................................................................................................... 3
1.2.2 Notice to Installer.................................................................................................................. 3
1.2.3 Product Hazards .................................................................................................................... 4
2Product Description .......................................................................................................5
2.1 Overview.................................................................................................................................... 5
2.2 Basic Operating Principle........................................................................................................... 6
2.3 Technical Data ........................................................................................................................... 7
2.4 Model Code Key......................................................................................................................... 7
2.5 Schematic Symbol...................................................................................................................... 7
3Installation ....................................................................................................................8
3.1 Mechanical ................................................................................................................................ 8
3.2 Piping......................................................................................................................................... 8
3.3 Electrical Connections................................................................................................................ 9
3.4 Brake System Plan ................................................................................................................... 10
4Commissioning ............................................................................................................11
4.1 Adjustment.............................................................................................................................. 11
4.2 Functional Test ........................................................................................................................ 11
5Maintenance ...............................................................................................................11
5.1 Preventative Maintenance ...................................................................................................... 11
5.2 Bypass Override....................................................................................................................... 11
5.3 Seal Service.............................................................................................................................. 12
5.4 Recommended Spare Parts and Kits........................................................................................ 12
6Warranty.....................................................................................................................13
7Appendix A: Installation Dimensions ............................................................................14
8Appendix B: Parts List ..................................................................................................16

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1INTRODUCTION
1.1 CONTACT
Kobelt Manufacturing Co. Ltd.
8238 129th Street
Surrey, British Columbia
Canada, V3W 0A6
Sales Tel:
Fax:
Email:
Website:
[phone]
[phone]
[email protected]
www.kobelt.com
This document is intended to clearly present comprehensive product data and provide technical
information to assist the end user in design applications. Kobelt reserves the right, without notice, to
change the design, or construction, of any products and to discontinue or limit distribution of any
products. Kobelt also reserves the right to change, or update, without notice, any technical information
contained within this document.
Kobelt recommends that customers visit our website to check for updates to this Manual. Once a
product has been selected for use, it should be tested by the user to ensure proper function in all
possible applications. For further instructions, please contact our distributors or visit our website.
1.2 SAFETY
1.2.1 Safety Alerts
Throughout this manual, the following symbols, and their accompanying explanation, are used to alert
the user to special instructions concerning a service or operation that may be hazardous if performed
incorrectly or carelessly. The associated risk levels are stated below.
This symbol indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
This symbol indicates a hazardous situation, which if not avoided, could
result in minor or moderate injury.
This symbol informs the reader of events not related to personal injury
but which there is a risk of damage to property or equipment.
This symbol informs the reader of safety-related instructions or
procedures.
1.2.2 Notice to Installer
Disregarding the following safety measures can result in an accident causing severe injury to personnel
and damage to material assets.
•Only use the product as directed in this manual.
•Never put the product into service if there is evidence of visible damage.
•Never put the product into service before fully completing installation and commissioning.
•Do not carry out any modifications to the product.

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•Only use authentic Kobelt spare parts.
•Observe all local regulations, directives and laws during the installation of this product.
•All installation, commissioning, and maintenance work must only be conducted by qualified
personnel. (For the purpose of this manual, qualified personnel are persons who are familiar with
the assembly, installation, commissioning, and operation of the product and who have the
qualifications necessary for their occupation.)
•Observe all specifications in this manual. If these guidelines are not followed and damage occurs,
the warranty will be voided.
1.2.3 Product Hazards
Equipment Starts Automatically:
The connected brakes may activate suddenly while
servicing this product, causing bodily harm. Ensure that
all power sources are locked out prior to performing
work.
High Pressure Fluids:
The 3329 relay valve uses compressed air. Ensure all
pressure is exhausted and the pressure source locked
out prior to performing work.
Noise Pollution:
The 3329 relay valve exhausts high velocity air. Ensure
hearing protection is worn when working near this
product.

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2PRODUCT DESCRIPTION
2.1 OVERVIEW
The Kobelt 3329 relay valve permits proportional control of air applied brakes. The pressure output is
directly regulated by the pilot pressure.
These units are available in three versions: remotely piloted, electro-proportional control and electro-
proportional with safety bypass functionality.
Figure 1: Valve Nomenclature

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2.2 BASIC OPERATING PRINCIPLE
The purpose of the 3329 relay valve is to
amplify the volume of air from a variable
pressure source while following the pilot
pressure signal with minimal error. The valve
uses a large diaphragm to maintain balance
between the pilot pressure and sensed
actuator pressure. The diaphragm makes
these valves very accurate due to the low
friction.
The pilot pressure entering the pilot port
applies a force on the diagram and spool
assembly. When this force exceeds the
cracking pressure, the spool moves
downward and opens the inlet poppet thus
allowing air to flow to the “OUT” port (see
Fig. 2).
Air pressure goes to the “OUT” port and via
an orifice, also to the pilot chamber. The air
accumulating on the underside of the
diaphragm until such a point that the
pressures on both sides of the diaphragm are
equal and the spool moves back to its neutral
position and the inlet poppet closes again.
This will cause an equilibrium point whereby
no air flow will take place.
Reducing the pilot pressure to a value less
than the outlet pressure will cause the spool
to move upwards and lift itself from the inlet
poppet seat and permit exhaust of air to
atmosphere. This will permit the outlet air to
also exhaust until the valve is in a balanced
position again.
Figure 2: Principle of Operation

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2.3 TECHNICAL DATA
Maximum supply pressure: 150 psi [10.3 bar]
Minimum pilot pressure: 5 psi [.3 bar]
Pressure output: 0-100 psi [0-6.9 bar]
Hysteresis: 2 psi [.14 bar]
Port sizes: 3/4 NPT
Ambient temperature: -40°F…+140°F [-40 °C… + 60 °C]
Weight: 9.4 lbs [4.3 kg]
2.4 MODEL CODE KEY
The 3329 relay valve can be configured to have various features. Below is a key defining the letter code
options:
2.5 SCHEMATIC SYMBOL
3329
3329-E
3329-EP

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3INSTALLATION
3.1 MECHANICAL
The relay valve must be mounted on a flat surface with adequate strength and stiffness to withstand the
system vibrations and flow forces. Choose a location that is as close as possible to the brakes.
The valve is equipped with (2) two clearance holes for ¼ [M6] screws or bolts inserted from the front.
Ensure the unit is securely fastened, preferably with an anaerobic thread locker such as Loctite 243.
Reference Appendix A: Installation Dimensions at the back of this manual.
3.2 PIPING
To make the proper piping connections at the control valve, refer to the diagram below.
The 3329-EP relay valve is equipped with a 1/8 NPT emergency bypass port. Ensure that 100 psi
regulated air is supplied to this port for lifting applications. If the electro-proportional valve fails, this
supply pressure will override and set the relay valve to maximum output.
Loss of braking:
Failure of the electro-proportional solenoid valve may result in a sudden loss
of braking and result in an accident. Ensure that 100 psi regulated air is
supplied to the emergency bypass port for lifting applications.
Figure 3: Piping Connections

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The exhaust ports do not need to be connected.
Install the port fittings using thread sealant and tighten to 2 - 3 turns from finger tight. Use brass pipe
fittings as steel fittings are too heavy and may split the port.
Do not over tighten the fittings as damage to the valve may occur.
The piping to the relay valves must be adequately sized to ensure adequate response times. The piping
must be selected to safely withstand the pressures required to operate the system. Secure the piping
against vibration with pipe clamps per the schedule in the table below.
Table 1: Pipe Clamp Table
PIPE CLAMP TABLE
PIPE SCHEDULE
3/8”-½” tube
[DN6]
¼” – 1/2” pipe
½”-3/4” tube
[DN8-DN15]
¾”pipe
1”-1.25” tube
[DN20]
1”pipe
1.50” tube
[DN25]
CLAMP SPACING
3 ft [914 mm]
4 ft [1219 mm]
5 ft [1524 mm]
6.5 ft [1981 mm]
All piping must be cleaned prior to connection to the actuators. Welded carbon steel piping must be
pickled to remove the scale produced by welding.
Kobelt 3329 relay valves are equipped with “U” cups and “O” rings and therefore require lubrication in
order to provide long service life. Unlubricated seals will have excessive friction and wear. The oil that
is required for the lubricator should be a hydraulic type with a viscosity grade of 10 to 32 centistokes.
Heavy oils do not work well for lubricators.
The main supply line to the control head should be equipped with a filter, regulator and lubricator. The
filter’s function is to remove moisture and dirt in the system, and the regulator will provide a constant
air pressure to the control system.
3.3 ELECTRICAL CONNECTIONS
The 3329-EP relay valve is equipped with three connection points as follows:
1. Electro-proportional solenoid:
a. 2 pole + PE, DIN 43650-A
2. Bypass solenoid:
a. 2 pole + PE, DIN 43650-A
3. Pressure Feedback:
a. 4 pin –M12
Pin 1: Vin
Pin 2: not used
Pin 3: Output
Pin 4: GND
Ensure that the mating cables are securely fastened to their respective receptacles.

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3.4 BRAKE SYSTEM PLAN
Below is a piping diagram depicting how to utilize the Kobelt 3329-E relay valve in a hoist braking
system.
Figure 4: 3329-E System Arrangement

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4COMMISSIONING
4.1 ADJUSTMENT
The valve is adjusted at the factory and, as such, will not require any further adjustment after
installation.
4.2 FUNCTIONAL TEST
Do not put the unit into service until it has been
tested. The Functional Test should be carried out
while the equipment is in a secure state.
After installation, test the control valve and verify that it operates the brakes over the full pressure range.
Cycle the pressure to maximum and back to zero. Verify that the pressure to the brakes follows the handle
command gradually without jumps or delays.
5MAINTENANCE
5.1 PREVENTATIVE MAINTENANCE
•Quarterly (4 times per year)
oInspect unit for air leaks
•Bi-annually (once every two years)
oLubricate seals
5.2 BYPASS OVERRIDE
The 3329-EP version with emergency bypass
functionality is provided with a manual override switch
as shown in figure 5. This switch can be used to
manually set the valve to the electro-proportional pilot
source in the event that the bypass solenoid coil fails.
Use a flat head screw driver and turn the red plastic
screw ¼ turn clockwise to set to the ‘Override’ position.
Ensure that the bypass switch is only used in extreme
cases and that it is reset to the normal position when
complete.
Loss of braking:
Failure to reset the manual override to the normal position may result in a
sudden loss of braking and result in an accident.
Figure 5: Solenoid Override

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5.3 SEAL SERVICE
All sliding seals should be lubricated with oring grease once every two years. When replacing seals,
ensure both U-cups are oriented correctly (refer to fig6 below).
Figure 6: Seal Orientation
5.4 RECOMMENDED SPARE PARTS AND KITS
The spare parts kept on hand will depend on the severity of the service. The User should monitor the
condition of their control head to predict necessary spare parts and ensure they are on hand when
needed. As a minimum Kobelt recommends keeping the following parts for each unit in service:
1. One 3329-RK repair kit
2. One solenoid for 7048-0019 valve
3. One solenoid for 7048-0020 valve
Refer to the parts list drawings in Appendix B for a complete list of parts. When purchasing spare parts
refer to Appendix B: Parts List at the back of this manual for Kobelt component Part Numbers.
It is recommended that any required service work on a
Kobelt unit be performed by a factory authorized service
representative. Please contact the nearest Kobelt authorized
distributor for assistance.

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6WARRANTY
Kobelt Manufacturing Co. Ltd. (“Kobelt”) warrants the Products and Parts manufactured by Kobelt to be
free from defects in workmanship or material and that said products are designed mechanically and
functionally to perform to specifications.
This warranty is effective providing:
•The equipment is used within the intended operating conditions and in accordance with Kobelt
recommendations
•The equipment is installed according to equipment diagrams, specifications and recommendations
which Kobelt has provided
This warranty becomes invalid if the factory supplied serial number has been removed or altered on the
product. This warranty does not cover cosmetic damage or damage caused by an act of God, accident,
misuse, abuse, negligence or modification of any part of the product. This warranty does not cover
damage due to improper operation or maintenance, connection to inappropriate equipment or
attempted repair by anyone other than an authorized Kobelt representative.
Upon identification of a potential issue or defect with a Kobelt Product or Part, the Warranty Applicant
(“Applicant”) must immediately contact Kobelt and describe the issue in writing, by letter, fax, email or
other electronic conveyance. Kobelt will then assess the cause of the defect and determine warranty
applicability and appropriate remediation.
If any part is found to be defective, Kobelt will replace said part FOB the Kobelt factory provided that
any such defective part is returned by the Buyer with freight and applicable forwarding charges prepaid
by the Buyer. Kobelt’s sole obligation to the Applicant will be to repair or replace the defective part with
same or similar product, to a maximum value of the list price of the product or part. The Kobelt warranty
does not cover labour charges, travel or any other associated expenses.
All Products and Parts manufactured by Kobelt, are subject to a warranty against manufacturer’s defects
in materials or workmanship for a period of two (2) years from the date of purchase.
Kobelt will be responsible for all Products or Parts sold by Kobelt but manufactured by 3rd party
manufacturing companies. However, these products and parts are subject to applicable 3rd party
warranties and may not be the same as the Kobelt warranty.

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7APPENDIX A: INSTALLATION DIMENSIONS
Figure 7: 3329-EP Installation Dimensions

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3329-E
Figure 8: 3329-E Installation Dimensions

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8APPENDIX B: PARTS LIST
3329

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ITEM QTY. PART NUMBER DESCRIPTION
1 1 3329-0001 MAIN BODY
2 1 3329-0002 DIAPHRAGM HOUSING BOTTOM
3 1 3329-0003 DIAPHRAGM HOUSING, TOP, 3329
4 1 3329-0004 POPPET COVER; 3329 RELAY VALVE
5 2 3329-0005 DIAPHRAGM WASHER, 3329
6 1 3329-0006 VALVE STEM; 3329 RELAY VALVE
7 1 3329-0007 VALVE SEAT
8 1 3329-0008 VALVE POPPET; 3329 RELAY VALVE
9 1 3329-0009 SEAL RETAINER, 3329
10 8 1001-1012 SCREW - HEX HD; 1/4-20 X 3/4 UNC; 18-8 SS
11 4 1002-1008 CAP SCREW - SKT HD; 1/4 UNC X 1/2 LG, 18-8
12 4 1010-0808 SCREW, RND HD PHIL, #10-24 X 1/2, 18-8 SS
13 1 1022-0264 NUT, JAM, 1/2-20
14 4 1023-0216 FLAT WASHER, 1/4, TYPE B, NARROW, 18-8 SS
15 4 1023-0410 HIGH COLLAR LOCK WASHER, 1/4" SS
16 1 1201-0108 SPRING, COMPRESSION, .8125 X .0625 X 1.00
17 1 3329-RK REPAIR KIT, RELAY VALVE

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3329-EP

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ITEM QTY. PART NUMBER DESCRIPTION
1 1 3329-0101 MAIN BODY
2 1 3329-0002 DIAPHRAGM HOUSING BOTTOM
3 1 3329-0103 VALVE MANIFOLD; ELECTROPROPORTIONAL PRESSURE VALVE
4 1 3329-0004 POPPET COVER; 3329 RELAY VALVE
5 2 3329-0005 DIAPHRAGM WASHER, 3329
6 1 3329-0006 VALVE STEM; 3329 RELAY VALVE
7 1 3329-0007 VALVE SEAT
8 1 3329-0009 SEAL RETAINER, 3329
9 8 1001-1012 SCREW - HEX HD; 1/4-20 X 3/4 UNC; 18-8 SS
10 4 1002-1008 CAP SCREW - SKT HD; 1/4 UNC X 1/2 LG, 18-8
11 4 1010-0808 SCREW, RND HD PHIL, #10-24 X 1/2, 18-8 SS
12 1 1022-0264 NUT, JAM, 1/2-20
13 1 1201-0108 SPRING, COMPRESSION, .8125 X .0625 X 1.00
14 4 1023-0216 FLAT WASHER, 1/4, TYPE B, NARROW, 18-8 SS
15 1 6011-0013 PRESSURE TRANSMITTER; 10 BAR / 0.5-4.5V/ 1/4 NPT / M12
16 1 1061-0001 SINTERED BREATHER; 1/8 NPT
17 1 7039-7105 ADAPTER - ELBOW; 90, 1/8 MPT X 1/4 TUBE, PTC
18 3 7039-3054 EXPANSION PLUG, CV173-218S
19 1 7039-0076 TUBE; 1/4 OD DOT, YELLOW
20 1 7039-5671 PLUG, 1/8 NPT, SKT HD, S/S
21 1 3329-1000 MANIFOLD ASSEMBLY; PROPORTIONAL PRESSURE VALVE
22 1 1061-0005 MUFFLER; SINTERED BRONZE / 3/4 MPT
23 1 3329-RK REPAIR KIT, RELAY VALVE