VICKERS Agent Proportional Valve

VICKERS Agent Proportional Valve，KBS2-03-03-NS-11-E-CO-A-NS-VSC-NS-004-11

Proportional valve is a new type of hydraulic control device. On ordinary pressure valves, flow valves, and directional valves, proportional electromagnets are used instead of the original control parts to continuously and proportionally control the pressure, flow rate, or direction of oil flow remotely based on the input electrical signal. Proportional valves generally have pressure compensation performance, and the output pressure and flow rate can be unaffected by load changes

Vickers proportional valves have multiple series, with specific model codes designed for different control requirements. Common series include:

Proportional directional valve:

KDG4V/KDG5V series: used to control the direction and speed of movement of hydraulic actuators, such as KDG4V-3-2C03F-Z-M-U-H7-60. ‌‌

KBFDG4V series: Proportional directional valve with electrical feedback, suitable for high dynamic response scenarios. ‌‌

Proportional pressure valve:

KBCG series: such as KBCG-3-L160D-Z-M1-3-A-PE7-H1-10, used for proportional adjustment of system pressure. ‌‌

KCG series: such as KCG-6-W-350-3-Z-M-U-H1-10, belongs to the pilot operated proportional relief valve. ‌‌

Proportional flow valve:

FG/KFG series: such as FG-06-14, provides precise flow control and has IP65/67 protection level. ‌‌

KXG series: such as KXG-6-W250-Z-M-U-HL1-10, commonly used in high flow control applications. ‌‌

Working principle and classification

The Vickers proportional valve continuously and proportionally controls hydraulic parameters through electrical signals. Its core working principle and classification are as follows:

Electrical mechanical conversion method:

Electromagnetic type: using proportional electromagnets to convert current signals into force or displacement, directly controlling the position of the valve core. ‌‌

Electro hydraulic: using a torque motor and nozzle baffle structure as the pilot stage, controlling the main valve parameters by changing the fluid flow resistance, suitable for high-pressure and high flow systems. ‌‌

Electric type: It is driven by a DC servo motor and outputs force and displacement through a reduction mechanism to further control hydraulic parameters. ‌‌

Classification of Control Functions:

Single parameter control: including electro-hydraulic proportional pressure valve and electro-hydraulic proportional flow control valve. ‌‌

Multi parameter control: such as proportional directional valves (simultaneously controlling direction and flow) and proportional compound valves (simultaneously controlling pressure, flow, and direction). ‌‌

Technical features and application advantages

Vickers proportional valves focus on reliability and ease of use in their design, and have the following significant features:

Integrated design:

Partial models integrate amplifiers to achievePlug and play eliminates the need for on-site gain adjustment or dead zone compensation, simplifying installation and wiring. ‌‌

The amplifier is installed in a sturdy and durable metal casing, with good sealing and strong anti pollution ability .‌‌

Environmental adaptability:

provideIP65 and IP67 environmental ratings, with excellent moisture resistance, can directly withstand water or liquid flushing. ‌‌

Oil immersed electromagnetic action design, the actuator moves inside the oil, with a gentle effect, smooth and silent switching under high pressure, and reduces oil leakage .‌‌

Selection and maintenance:

The model code includes detailed information such as installation interface, valve core type, rated flow rate, etcIn the KDG5V series, '5' represents the NFPA D05 interface. ‌‌

Provide original repair kits and seals (such as60539-000 oil seal), supports later maintenance and upkeep. ‌‌

VICKERS solenoid valve and safety valve are integrated to form a pilot operated pressure valve, which is both an unloading valve and a safety valve, sometimes also an overflow valve. During unloading, its control oil passage runs through each directional valve, similar to the unloading oil passage mentioned above. When each directional valve is in the neutral position, the control oil passage of the unloading valve (see Figure 1b) As shown in Figure 2, it runs through various directional valves and is connected to the oil tank. During unloading, most of the oil is unloaded with short channels and low pressure loss. When any directional valve works, the control oil channel is cut off, and the oil source enters the actuator from the directional valve. The working pressure is controlled by the pilot valve. At this time, the system pressure is adjusted by the pilot valve. This unloading method, even if the number of directional valve channels increases, only the control oil channel increases, and the unloading pressure does not increase significantly, always maintaining a low unloading pressure. This unloading method is mostly used for manual directional valves, and the unloading is reliable

The main valve of VICKERS solenoid valve (also known as safety valve) can be divided into three types according to the matching form: three-stage concentric, two-stage concentric, and slide valve. Among them, the slide valve structure has low working pressure and low control pressure accuracy; Although the three-level concentric structure is mature and widely used, compared with the two-level concentric structure, it is not as sensitive in action, has the same specifications, and has the same stroke. The oil flow capacity of the two-level concentric structure is much greater than that of the three-level concentric structure; The two-stage concentric control pressure is stable and has good processability. The application prospects of the two-stage concentric structure are broad. Here, we discuss its structural dimension design method based on the two-stage concentric structure

The pilot oil from the VICKERS solenoid valve controls the movement of the main reversing valve spool, allowing the incoming oil from the working pump to enter the boom cylinder and achieve boom lift. The higher the output pressure of the proportional pilot pressure reducing valve, the greater the displacement of the control main directional valve core, the greater the flow rate through the main directional valve, and the faster the boom rises. When the control handle is pulled to the limit position, the limit electromagnetic iron in the handle is energized, and the handle is attracted to the limit position. The boom rises at the maximum speed. When it reaches the position limited by the upper limit switch of the boom, the limit electromagnet of the operating handle is powered off, and the handle automatically returns to the middle position. The boom can then remain in the limited position. During the process of raising the boom, if the boom needs to stay in a certain position, the operating handle needs to be returned to the neutral position.

VICKERS solenoid valves are mainly used as actuating components in electro-hydraulic servo systems (see hydraulic servo systems). In servo systems, hydraulic actuators have the characteristics of good speed, high output power per unit weight, smooth transmission, and strong anti-interference ability compared to electrical and pneumatic actuators. On the other hand, electrical components are often used in servo systems to transmit signals and correct characteristics. Therefore, modern high-performance servo systems also use electro-hydraulic methods, and servo valves are essential components of such systems.

VickersVICKERSThe conventional models of proportional valves are as follows:

02-154581 KTG4V-3S-2B08N-M-U-H5-60-EN427

855AN00004A KBDG4V-3-33C20N-M2-PE7-H7-11

02-311229 KDG4V-3-33C30X-VM-U-H7-60

871918 KHDG5V-5-2C100N-X-VM-U1-H1-20

02-157450 KDG4V-3-33C30X-M-U-H7-60

857AN00009A KBDG5V-7-33C170N-M1-PE7-H1-11

02-323887 KDG4V-5-2C50N-Z-M1-U-H7-30

857AN00177A KBDG5V-5-2C90N-M1-PH7-H1-11

857AN00134A KBDG5V-8-33C330N-X-M2-PE7-H1-11

02-147675 KDG4V-3-2C20N-M-U-H7-60

02-145957 KCG-3-160D-Z-M-U-H1-10

857AN00260A KBDG5V-7-2C180N-X-H-M1-PE7-H1-10

857AN00246A KBDG5V-7-33C170N-X-H-M1-PE7-H1-20

857AN00256A KBDG5V-7-2C180N-T-M2-PE7-H1-20

855AN00075A KBDG4V-5-2C50N-Z-M2-PE7-H7-11

02-157008 KDG4V-5-33C50N-H-M-U-HA730

821AN00102A KDG5V-7-2C180N-T-M-U-H1-10

02-353771 KDG5V-8-2C330N-X-T-M-U-H1-20

857AN00002A KBDG5V-8-33C330N200-X-T-M2-PE7-H1-11

857AN00243A KBDG5V-7-33C170N-M1-PE7-H1-20

871918 KHDG5V-5-2C100N-X-VM-U1-H1-20

6041384-001 KHDG5V-8-33C375N-X-VM-U1-H1-30

KCG-3-250D-Z-M-U-H1-10

02-353252 KCG-3-350D-Z-M-U1-H1-10

02-156652 KCG-3-L250D-Z-M-U-H1-10P15-T10

02-145958 KCG-3-250D-Z-M-U-H1-10

858AN00040A KBFDG4V-5-33C50N25-Z-M2-PH7-H7-12

857AN00012A KBDG5V-7-33C85N-EX-M2-PE7-H1-11

565376 KFDG4V-3-2C20N-Z-M-U1-H7-20

KBS2-03-04-NS-11-E-CO-A-NS-VSC-NS-004-11

KBS2-03-03-NS-11-E-CO-A-NS-VSC-NS-004-11

Thermal power model:

6041384-001 KHDG5V-8-33C375N-X-VM-U1-H1-30

871920 KHDG5V-5-33C80N-X-VM-U1-H1-20

871918 KHDG5V-5-2C100N-X-VM-U1-H1-20

565320 KFDG4V-5-2C70N-Z-VM-U1-H7-20

VICKERS Agent Proportional Valve，KBS2-03-03-NS-11-E-CO-A-NS-VSC-NS-004-11