2FRE6B-2X/1LK4RV力士樂電磁閥*
力士樂FRE6型二通比例調速閥
2FRE6A-20B/3QRV
2FRE6A-20B/6QRV
2FRE6A-20B/25QMV
2FRE6A-20B/2QEMV
2FRE6B-20B/16QRV
2FRE6A-20B/2QERV   2FRE型調速閥是兩通的流量控制閥，此閥是由減壓閥和節流閥串聯構成的。油流進入調速閥后，先經過減壓閥減壓，再由節流閥節流。由于減壓閥對節流閥進行了壓力補償，所以調速閥的流量不受負載變化的影響，保持穩定。同時節流窗口設計成薄刃狀，流量受溫度變化很小。調速閥和單向閥并聯時，油流能反向回流。
２FRM6型調速閥可外用關閉壓力補償器，可設置單向閥，用數字指示的調節旋鈕，閥可以帶鎖，安裝尺寸符合DIN24340
產品列表--力士樂系列閥
1. REXROTH溢流閥
①       DBD型直動溢流閥
②       DB/DBW型5X系列先導式溢流閥
③       DB...K型4X系列插入式先導溢流閥
④       ZDB/Z2DB6型4X系列疊加式溢流閥
⑤       ZDB/Z2DB10型4X系列疊加式溢流閥
⑥       ZDBD型疊加式溢流閥
2. REXROTH減壓閥
①       DR型5X系列先導式減壓閥
②       ZDR6D型疊加式減壓閥
③       ZDR10D型疊加式減壓閥
3. REXROTH順序閥
①       DZ型5X系列先導式順序閥
4. REXROTH卸荷閥
②       DA/DAW型5X系列先導式卸荷閥
5. REXROTH節流閥
③       MK/MG型節流閥/單向節流閥
④       DV/DRV型節流閥/單向節流閥
⑤       Z2FS型疊加式雙單向節流閥
6. REXROTH單向閥
①       S型單向閥
②       RVP型單向閥
③       Z1S型疊加式單向閥
④       SV/SL型4X系列液控單向閥
⑤       Z2S型疊加式液控單向閥
⑥       Z2S6型6X系列疊加式液控單向閥
7. REXROTH調速閥
①       2FRM6型調速閥
8. REXROTH換向閥
②      WE6型6X系列濕式電磁換向閥
③      WE10型3X系列濕式電磁換向閥
④      WEH型電液換向閥
⑤      WMD6型手動換向閥
⑥      WMD10型手動換向閥
⑦      WH型液動換向閥
⑧      WMM型手動換向閥
⑨      WMM25、32通徑手動換向閥
2FRE6B-2X/1LK4RV力士樂電磁閥*
Function, section
Proportional flow control valves of type 2FRE … feature a 2-
way function. They can control a flow, which is determined by
an electrical command value, with pressure and temperature
compensation.
They basically consist of housing （）, proportional solenoid with
inductive position transducer （2）, metering orifice （3）, pressure
compensator （4） and optional check valve （5）.
Proportional flow control valve type 2FRE 6 B-2X/.K4RV
（without external closing, with check valve）
The setting of the flow is determined by the setting （0 to 00 %）
on the command value potentiometer. The selected command
value causes metering orifice （3） to be adjusted via the amplifier
and the proportional solenoid. The inductive position transducer
senses the position of metering orifice （3）. Any deviations from
the command value are corrected by the closed-loop position
control.
Pressure compensator （4） keeps the pressure differential
across metering orifice （3） always at a constant value. This en
sures load-compensation of the flow.
The low temperature drift is a result of the favourable design of
the metering orifice.
At a command value of 0 % the metering orifice is closed.
In the event of a power failure or cable break on the inductive
position transducer, the metering orifice closes.
Starting from a 0 % command value, a jump-free start-up is
possible. The metering orifice can be opened and closed with a
delay provided by two ramps in the electrical amplifier.
Check valve （5） allows the free return flow from B to A.
The supply and return flow to and from the actuator can be con
trolled with the help of an additional rectifier sandwich plate of
type Z4S 6… under the proportional flow control valve.
Proportional flow control valve type 2FRE 6 A-2X/.K4MV
（with external closing, without check valve）
In principle, the function of this valve is the same as that of valve
type 2FRE 6 B-2X/.K4RV.
To suppress the start-up jump when metering orifice （3） is open
（command value > 0 %）, closing of pressure compensator （4）
is provided via port P （6）. There is no internal connection be
tween port A and pressure compensator （4）. The pressure in P
upstream of directional valve （8） acts on pressure compensa
tor （4） and holds it in the closed position against the force of
spring （7）. When directional valve （8） is switched from P to B,
pressure compensator （4） moves from the closed position to
the control position, thus preventing a start-up jump.