2FRE6B-2X/1LK4RV力士樂(lè)電磁閥*
力士樂(lè)FRE6型二通比例調(diào)速閥
2FRE6A-20B/3QRV
2FRE6A-20B/6QRV
2FRE6A-20B/25QMV
2FRE6A-20B/2QEMV
2FRE6B-20B/16QRV
2FRE6A-20B/2QERV   2FRE型調(diào)速閥是兩通的流量控制閥，此閥是由減壓閥和節(jié)流閥串聯(lián)構(gòu)成的。油流進(jìn)入調(diào)速閥后，先經(jīng)過(guò)減壓閥減壓，再由節(jié)流閥節(jié)流。由于減壓閥對(duì)節(jié)流閥進(jìn)行了壓力補(bǔ)償，所以調(diào)速閥的流量不受負(fù)載變化的影響，保持穩(wěn)定。同時(shí)節(jié)流窗口設(shè)計(jì)成薄刃狀，流量受溫度變化很小。調(diào)速閥和單向閥并聯(lián)時(shí)，油流能反向回流。
２FRM6型調(diào)速閥可外用關(guān)閉壓力補(bǔ)償器，可設(shè)置單向閥，用數(shù)字指示的調(diào)節(jié)旋鈕，閥可以帶鎖，安裝尺寸符合DIN24340
產(chǎn)品列表--力士樂(lè)系列閥
1. REXROTH溢流閥
①       DBD型直動(dòng)溢流閥
②       DB/DBW型5X系列先導(dǎo)式溢流閥
③       DB...K型4X系列插入式先導(dǎo)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(dǎo)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(dǎo)式順序閥
4. REXROTH卸荷閥
②       DA/DAW型5X系列先導(dǎo)式卸荷閥
5. REXROTH節(jié)流閥
③       MK/MG型節(jié)流閥/單向節(jié)流閥
④       DV/DRV型節(jié)流閥/單向節(jié)流閥
⑤       Z2FS型疊加式雙單向節(jié)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(diào)速閥
①       2FRM6型調(diào)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(dòng)換向閥
⑥      WMD10型手動(dòng)換向閥
⑦      WH型液動(dòng)換向閥
⑧      WMM型手動(dòng)換向閥
⑨      WMM25、32通徑手動(dòng)換向閥
2FRE6B-2X/1LK4RV力士樂(lè)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.