KDG4V3 Standard Performance Proportional Directional Valves without Feedback

The KDG4V3 Standard Performance Proportional Directional Valves without Feedback 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 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.

Features and Benefits

• These global products, manufactured to world-class quality standards, are sold and serviced throughout the world.
• KDG4V 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 amplifier 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.