Hydraulic valves and components
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.
TYPE 2FRM 20
Flow control valves are 2-way flow control valves. They are used to maintain a flow constant independently of pressure and temperature. The valves basically consist of the housing, orifice bushing, pressure compensator with optional stroke limiter, check valve, adjustment element. The flow from channel A to channel B is throttle at the orifice. In order to maintain the flow across the orifice constant, a pressure compensator is connected upstream of the orifice. The flow is maintained largely independent of temperature due to the orifice design. Free return flow from channel B to channel A is directed via the check valve. The flow is only controlled from A to B. In order to control the flows in both directions a rectifier sandwich plate type Z4S can be installed below the flow control valve.
TYPE 2FRM 6
The flow control valve type 2 FRM is a 2-way flow control valve. It is used for maintaining a contant flow, independent of pressure and temperature.The valve basically comprises of housing, rotary knob, orifice, pressure compensator and an optional check valve.
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.
Valves of type WEH are directional spool valves with electrohydraulic operation. They control the start, stop and direction of a fluid flow. The directional valves basically consist of the main valve with housing, main control spool, one or two return springs, and the pilot valve with one or two solenoids "a" and/or "b". The main control spool in the main valve is held in the neutral or in the initial position either by the springs or by means of pressure. In the initial position, the two spring chambers and are connected to the tank without pressure via the pilot valve. The pilot valve is supplied with pilot fluid via the pilot line. The pilot oil supply can be either internal or external (external via port X). When the pilot valve is operated, e.g. solenoid "a", the pilot spool is shifted to the left and thus spring chamber is pressurized with pilot pressure. Spring chamber remains un-pressurized. The pilot pressure acts on the left side of the main control spool and pushes it against the spring. As a consequence, the ports P to B and A to T are connected in the main valve. When the solenoid is de-energized, the pilot spool returns to its initial position (exception: detented spool). The spring chamber is unloaded to tank. The pilot oil is expelled from the spring chamber via the pilot valve into the Y channel. The pilot oil supply and drain are internal or external (external via port Y). An optional manual override permits pilot spool to be operated without energizing the solenoid.
Valves of type WH are directional spool valves with hydraulic operation. They control the start, stop and direction of a fluid flow. The directional valves basically consist of the valve housing, the main control spool, one or two return springs and in the case of valves with spring return or spring centring, and the pilot connecting plate. The control spool is operated directly by means hydraulic pressure. The control spool is held in the neutral or in the initial position either by springs or by means of pressure. Pilot oil supply and pilot oil drain are external.
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.