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INQL3-MAR09
03/03/09 WW
QL3 PRESSURE CONTROL VALVE
INSTALLATION & MAINTENANCE INSTRUCTIONS
SPECIFICATIONS
ELECTRICAL
SUPPLY VOLTAGE....................….15-24 VDC
SUPPLY CURRENT...................….250mA max.
COMMAND SIGNAL
VOLTAGE..................…..0-10 VDC
CURRENT..............…….4-20mA differential
COMMAND SIGNAL IMPEDANCE
VOLTAGE..................…..4.7 K
Ω
CURRENT..................….100
Ω
ANALOG MONITOR SIGNAL
VOLTAGE...............…….0-10 VDC @ 10mA max
CURRENT……………….4-20mA Sinking or Sourcing
MECHANICAL
PRESSURE RANGES¹...............0 to 5 psig through 0-150 psig
OUTPUT PRESSURE¹................0-100% of range
FLOW RATE
FORWARD & EXHAUST .............25 SCFM max @ 120 psig inlet &
100 psig outlet
(708L/min @ 8.27 BAR inlet & 6.89
Bar outlet)
MIN. CLOSED END VOLUME.…..5 in³
FILTRATION RECOMMENDED…40 micron actual
LINEARITY………………...........…<±0.3% F.S. BFSL ²
HYSTERESIS……………………….0.05% F.S.
ACCURACY ..............................……<±0.4% F.S. ²
RESOLUTION………………………0.05% F.S.
WETTED PARTS‡ .................Elastomers - Buna N (3)
Manifold - Aluminum Nickel Plated
Valves - 430FR SS, 360 Brass
Seal material: Viton & Buna-N
P.Transducer - Utem 1000, Aluminum,
PHYSICAL
OPERATING TEMPERATURE....32-158ºF [0-70ºC]
DIMENSIONS…………………….2in.X2 in.X4.4 IN
(51mmX51mmX111mm)
WEIGHT.................................…....1.06 lb [0.50 Kg]
PROTECTION RATING...........…NEMA 4 / IP65
HOUSING...............................……Aluminum (Anodized)
VOLUME BOOSTER.....................Electroless Nickel Plate
¹ Pressure ranges are customer specified. Custom pressure ranges are avail-
able. Any range 5 to 150.
² Dependent on response adjustments. Valve can be field adjusted for best
response for the actual application
³ Other elastomers are available. Consult factory.
DESCRIPTION
The QL3 is a closed loop electronic pressure regulator consist-
ing of two solenoid valves, an internal pressure transducer, and an
electronic control circuit integrally mounted to a unique volume
booster. The output pressure is proportional to an electrical input
(command signal). The pressure is controlled by activating the
solenoid valves, which apply pressure to the pilot side of the vol-
ume booster. One valve functions as inlet control, the other as
exhaust. The output pressure of the volume booster is measured
by a pressure transducer, which is internally mounted and pro-
vides a feedback signal to the electronic control circuit. This feed-
back signal is compared against the command signal input. Any
differences between the command signal and the pressure feed-
back signal causes one of the solenoid valves to open to adjust the
pressure in the pilot of the volume booster. Pilot pressure is ad-
justed so that desired output pressure is achieved and maintained.
Since it is the actual desired work pressure that is being sensed
and fed back to the control circuit, any mechanical hysteresis of
the air piloted volume booster is automatically compensated for.
This allows for our extraordinary accuracy and repeatability.
The QL3 improves and builds on the proven Proportion-Air
QB3 series high performance by using a current driven variable
orifice solenoid valve and a unique analog PID circuit. This vari-
able orifice solenoid avoids the pressure “steps” prevalent in most
feed and bleed I/P’s. The PID circuit integrates error out quickly
resulting in superior resolution. The combination of a stepless
solenoid valve with a high speed analog PID on a high flow vol-
ume booster allows lots of air to be moved in a hurry, but pre-
cisely.
Command inputs come in a choice of either a 0-10 Vdc or 4-20
mA. The QL3 also provides an electrical monitor signal for out-
put to a panel meter or controller for data acquisition or quality
assurance needs. The monitor signal comes from the internal pres-
sure transducer. All QL3’s come standard with a 0-10 volt moni-
tor signal with 4-20 mA optional. Providing this monitor signal
as part of our standard package eliminates the need to purchase a
separate transducer.
The uniqueness of the volume booster design is that it has no
stamped gaskets or special molded diaphragm or seal parts. All
of the parts related to normal maintenance are standard o-rings.
Complete repair kits are available, but in case emergency repair is
needed parts should be available from any fluid power distributor
or even most neighborhood hardware stores. Since all sealing
parts are o-rings a large variety of chemical compounds are read-
ily available. You can select the compounds, which are most
ideally suited to your process and environment.
The QL3 is used for pressures up to 150 psig. For pressure
ranges between 150 and 500 psig, see the Proportion-Air QB3H
series.
Before you get started, please read these warnings:
♦
Examine the product. Ensure that you received what
you ordered.
♦
Read this guide first before you start and save it for
later use.
♦
You must have a good understanding of what the ad-
justments are on this product before using them.
♦
All compressed air and power should be shut off before
installing, removing or performing maintenance on this
product.
♦
Installation and use of this product should be under the
supervision and control of properly qualified personnel
in order to avoid the risk of injury or death.
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
