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.