The type 2FRE proportional flow control valves have a 2-way function. They can, from a applied electrical command value, regulate flow which is pressure and temperature compensated. They basically comprise of the housing, proportional solenoid with inductive position transducer, measuring orifice, pressure compensator as well as the optional check valve.
TYPE 2FRE 40 B
The type 2FRE proportional flow control valves have a 2-way function. They can, from an applied electrical command value, regulate a flow which is pressure and to a great extent temperature compensated. They basically comprise of the housing, proportional solenoid with inductive position transducer, measuring orifice, pressure compensator, stroke limiter, as well as an optional check valve. The setting of the flow is determined (0 bis 100 %) at the command value potentiometer. The applied command value, causes via the amplifier as well as the proportional solenoid, the adjustment of the measurement orifice. The position of the measurement orifice is obtained by the position transducer. Any deviations from the command value are compensated for by the position feedback control.
The 3-way pressure reducing valve type 3DREP 6 is directly actuated by proportional solenoids. They convert an electrical input signal into a proportional pressure output signal. The proportional solenoids are controllable wet pin DC solenoids with central thread and removable coil. The solenoids are controlled optionally via external control electronics.
Type 4WRA directional control valves are direct-operated via proportional solenoids and are used to control the direction and quantity of a flow. They consist basically of the housing, the control spool, one or two return springs, and in addition one or two proportional solenoids.
Type 4WRE directional valves are direct operated by means of proportional solenoids and are used to control the direction and volume of a flow. They consist basically of housing, control spool, two return springs, two proportional solenoids and a positional transducer.
Valve types 4WRZ are 4 way valves operated by means of proportional solenoids. They control the direction and flow rate of hydraulic fluid. They basically consist of the pilot valve, the main valve with the main spool, and the centering spring.
If solenoid "B" is energized, pilot spool is moved to the right.Pilot oil is then either fed internally from port P, or "externally" from port X via the pilot valve into the pressure chamber and moves the main spool a distance proportional to the strength of the electrical current. The throttling grooves in the main spool open progressively with increasing current, thus controlling the flow of hydraulic fluid to the actuator ports.
When the electrical signal is switched off, both the pilot spool, and the main spool return to neutral independent of the control pressure supply. An emergency hand operator permits movement of the pilot spool position without energizing the solenoids.
TYPE DBE - TYPE DBEM
These valves basically consist of the pilot control valve with proportional solenoid and the main valve with main spool insert.
This valve regulates pressure in proportion to the electrical command value. The valve consists basically of a housing, proportional solenoid with inductive positional transducer, valve seat and valve poppet. Pressure is set by adjusting the command value potentiometer (0 to 9 V). Adjusting the command value causes tensioning of the compression spring via the electronic controls and the proportional solenoid. Tensioning of the compression spring, i.e. the position of the spring plate, is determined by the inductive positional transducer. Any deviations from the command value are corrected by the closed loop positional control. The use of this principle eliminates the effect of solenoid friction.
TYPE DRE - TYPE DREM
The valve types DRE and DREM are pilot operated pressure reducing valves. They are used for the reduction of a working pressure. The valves basically consist of the pilot valve with proportional solenoid, main valve with main spool assembly, as well as an optional check valve.
This pressure and flow control valve is an energy-saving valve that can adjust the pressure and flow of system proportional to electrical sign. Since the valves controls the pump pressure by following the load pressure while keeping the differential pressure minimized,it serves as a low power-consumption energy-saving, meter-in, controlled flow control valve. Further, since a temperature compensation function is incorporated,this valve provides consistent flow control without respect to the fluid temperature.