Kobelt 2588 Instruction Manual

Kobelt Manufacturing Co. Ltd.
2588 Driller’s 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 ..................................................................................................................4
1.1 Contact ...................................................................................................................................... 4
1.2 Safety......................................................................................................................................... 4
1.2.1 Safety Alerts .......................................................................................................................... 4
1.2.2 Notice to Installer.................................................................................................................. 4
1.2.3 Product Hazards .................................................................................................................... 5
2Product Description .......................................................................................................6
2.1 Overview.................................................................................................................................... 6
2.2 Basic Operating Principle........................................................................................................... 7
2.3 Technical Data ........................................................................................................................... 8
2.4 Model Code Key......................................................................................................................... 8
2.5 Schematic Symbol...................................................................................................................... 8
3Installation ....................................................................................................................9
3.1 Mechanical ................................................................................................................................ 9
3.2 Valve Connections ..................................................................................................................... 9
3.3 Piping....................................................................................................................................... 10
3.4 Brake System Plan ................................................................................................................... 11
4Commissioning ............................................................................................................12
4.1 Adjustment.............................................................................................................................. 12
4.2 Functional Test ........................................................................................................................ 12
5Maintenance ...............................................................................................................13
5.1 Preventative Maintenance ...................................................................................................... 13
5.2 Adjustment.............................................................................................................................. 13
5.3 Recommended Spare Parts and Kits........................................................................................ 13
6Warranty.....................................................................................................................14
7Appendix A: Installation Dimensions ............................................................................15
8Appendix B: Parts List ..................................................................................................16
9Appendix C: Installation Cut-out Template....................................................................19

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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.
Pinch Points:
The 2588 driller’s valve contains pinch points, which can
cause bodily harm. Ensure that hands and fingers
remain clear of the pinch points when performing work.
High Pressure Fluids:
The 2588 driller’s valve uses compressed air. Ensure all
pressure is exhausted and the pressure source locked
out prior to performing work.

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2PRODUCT DESCRIPTION
2.1 OVERVIEW
The Kobelt 2588 driller’s valve permits proportional control of air applied brakes. The operator’s handle
turns a cam which depresses a spring-loaded valve stem. Pressure output is proportional to the handle
movement with the maximum output achieved when the handle is fully depressed.
These units are available in single and dual channel configurations as well as several different pressure
ranges. The dual channel option is to provide better control of two brake systems at light loads by only
operating one brake for the first one third of handle movement.
Figure 1: Valve Nomenclature

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2.2 BASIC OPERATING PRINCIPLE
The purpose of the pressure compensating regulator is to
provide an infinitely variable output pressure signal. There
is a direct relation between the mechanical input stem
position and the amount of accumulated air in the control
system. The balance is obtained with air pressure against a
reactor spring. The rolling diaphragm makes these valves
very accurate due to the low friction.
The air pressure entering the “IN” port is held in check until
the stem is depressed downward (see Fig. 1). This
downward movement will create an opening between the
supply ball and the seat thus allowing air to flow to the
“OUT” port (see Fig. 2). Air pressure goes to the “OUT” port
and via the orifice to the piston chamber, then compresses
the reactor spring at the bottom of the valve until such a
point that both supply valve ball and exhaust valve ball are
seated into their respective seats. This will cause an
equilibrium point whereby no air flow will take place.
Allowing the stem to move upwards will cause the exhaust
ball to lift itself from its respective seat and permit exhaust
of air to atmosphere. This will allow the main reactor spring
to push the seat upwards 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: 200 psi [13.8 bar]
Pressure Output (R spring): 0-100 psi [0-6.9 bar]
Hysteresis: 0.5 psi [.03 bar]
Handle Travel: 60 degrees
Port sizes: 1/4 NPT
Ambient Temperature: -40°F…+140°F [-40 °C… + 60 °C]
Weight: 33 lbs [15 kg]
2.4 MODEL CODE KEY
The 2588 driller’s valve can be configured to have various pressure springs and one or two sperate
outputs. Below is a key defining the letter code options:
2.5 SCHEMATIC SYMBOL

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3INSTALLATION
3.1 MECHANICAL
The driller’s valve must be mounted on a flat surface strong and stiff enough to withstand the operating
forces without excessive flexing. Choose a location that has sufficient room for the handle to swing to
both extreme positions.
Use the template in Appendix C to provide the correct cut-out on the control console.
The valve is equipped with (4) four threaded holes for ¼ UNC screws or bolts inserted from the front for
direct mounting to the dash. Ensure the unit is securely fastened, preferably with an anaerobic thread
locker such as Loctite 243.
3.2 VALVE CONNECTIONS
To make the proper piping connections at the control valve, refer to the diagram below.
The 2588-D control valve is equipped with four 1/4
NPT pressure ports. 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 control head may occur.
Figure 3: Piping Connections

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3.3 PIPING
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 2588 control 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.