Specifications

2
Introduction
KDG and KTG Valves
Vickers KDG and KTG valves are
non-feedback type proportional valves.
The KDG is a proportional directional valve
with two solenoids (C models). It
incorporates control of flow, direction,
acceleration, and deceleration in a single
control valve.
The KTG is a proportional throttle valve
with a single solenoid. B models are spring
centered with solenoid A removed. F
models are spring offset to port A and
respond to an increasing signal by
reducing the flow rate. The KTG’s spool
can be infinitely positioned to achieve
throttling (restriction) of the fluid flow.
The primary function of these valves is to
direct and meter fluid flow in proportion to
current received by the solenoid. This fluid
flow controls the velocity, direction, and
acceleration
or deceleration of a work cylinder
or fluid motor.
These valves are designed to fill the
performance gap between conventional
solenoid operated directional valves and
servo valves or feedback-type proportional
valves. They provide control of spool
position and metered fluid flow in
applications that don’t require the high
levels of accuracy, repeatability, or
response possible with feedback-type
proportional valves or servos.
Used with Vickers electronic amplifiers,
these valves provide an interface between
control system intelligence and hydraulic
muscle. This is a very practical way to
control actuator direction and speed while
eliminating shock caused by rapid
acceleration and deceleration of machine
loads.
In addition to improving machine
performance and life, these proportional
valves substantially simplify system design
by combining direction and flow control
capabilities in one package that mounts to
a standard NFPA/ISO subplate or manifold
interface.
The valve can also be readily tailored to a
vast array of applications by specifying the
specific valve configuration which best meets
system requirements.
The valve is controlled by applying current
to either solenoid A or solenoid B. This
current produces a force at the solenoid
push pin which, in turn, causes spool
travel. The spool will continue its motion
until the solenoid force is balanced by the
return spring force. Therefore, spool travel
is proportional to the amount of current
passing through the solenoid coil.
KADG and KATG Valves
The above description of KDG and KTG
valves also applies to KADG and KATG
valves, with one exception. “KA” valves
have an integral amplifier, whereas KDG
and KTG valves do not.
The control amplifier of KA models is
housed in a sturdy metal enclosure built
directly on, and prewired to, the valve.
Factory-set adjustments of gain, balancing
deadband and dither ensure high
repeatability valve-to-valve. The only
electrical inputs required are power
supply (24V) and a voltage command
signal of 10V.
Features and Benefits
 These global products, manufactured to
world-class quality standards, are sold and
serviced throughout the world.
 KDG4V and KTG4V valves have a low
installed cost due to commonality of parts
with Vickers DG4V-3(S) solenoid
operated directional valve.
 These valves open up expanded
application opportunities as a
cost-effective alternative to
feedback-type proportional and
servo valves.
 Sustained high machine productivity and
uptime result from the proven fatigue life
and endurance of reliable KDG4V and
KTG4V valves.
 Vickers flexible design approach provides
optimum performance. A wide variety of
matching electronic amplifiers, valve
options, and spool ratings allows the
system designer flexibility in meeting
application requirements.
 All valves are NFPA fatigue rated at 350
bar (5075 psi) for improved reliability and
performance.
 The fully encapsulated solenoid coils are
impervious to common industrial fluids.
Coils can be removed and replaced
quickly and easily without breaking into
the hydraulic envelope.
 The valves’ standard ISO 4401-03
mounting is interchangeable with any
NFPA D03 or CETOP 3 interface.
 The engineering resin junction box is
NEMA 4 rated for resistance to water and
all commonly used industrial fluids.
 Advantages of KADG and KATG valves
with integral amplifier:
 Factory-sealed adjustments for increased
valve-to-valve accuracy and simplified
system set-up  Valve and amplfier
selected, ordered, delivered and installed
as a performance-tested package
 Installation wiring reduced and simplified
 Simplified valve removal and replacement
 The use of Viton* O-rings throughout
provides multi-fluid capability and
prevents outside fluids from contacting
internal valve parts.
* Viton is a registered trademark of the
DuPont Co.