FAIRCHILD减压阀TD7800-421仙童FAIRCHILD减压阀工作平稳无振动；阀体内无弹簧，故无弹簧锈蚀、金属疲劳失效之虑；密封性能良好不渗漏，因而既减动压（水流动时）又减静压（流量为0时）；特别是在减压的同时不影响水流量。水流通过减压阀虽有很大的水头损失，但由于减少了水的浪费并使系统流量分布合理、改善了系统布局与工况，因此总体上讲仍是节能的。仙童FAIRCHILD减压阀的每一档弹簧只在一定的出口压力范围内适用，超出范围应更换弹簧。在介质工作温度比较高的场合，一般选用先导活塞式减压阀或先导波纹管式减压阀。介质为空气或水（液体）的场合，一般宜选用直接作用薄膜式减压阀或先导薄膜式减压阀。仙童FAIRCHILD减压阀介质为蒸汽的场合，宜选用先导活塞式减压阀或先导波纹管式减压阀。为了操作、调整和维修的方便，减压阀一般应安装在水平管道上。

仙童FAIRCHILD减压阀工作原理及其结构减压阀出厂时,调节弹簧处于未压缩状态,此时主阀瓣和付阀瓣处于关闭状态,使用时按顺时针方向转动调节螺钉,压缩调节弹簧,使膜片下移顶开付阀瓣,介质由a孔进入活塞上方,活塞在介质压力的作用下,向下移动推动主阀瓣离开主阀座,使介质流向阀后,同时由c孔进入膜片下方,当阀后压力超过调定压力时,仙童FAIRCHILD减压阀推动膜片上移压缩调节弹簧.付阀瓣随之向关闭方向移动,使流入活塞上方的介质减小,压力也随之下降,此时主阀瓣在主阀瓣弹簧力的推动下上移,使主阀瓣与主阀座的间隙减小,介质流量随之减少,使阀后压力随之下降到新的平衡,仙童FAIRCHILD减压阀反之当阀后压力低于调定压力时,主阀瓣和主阀座间隙增大,介质流量随之增加,使阀后压力随之增高达到新的平衡.

通过使用吸气管在变化的流动条件下保持调节压力的稳定性，该吸气管根据流速调节供应阀。美国Fairchild 30型调节器*具有1/4“水柱和平衡供气阀的控制灵敏度，可提供一致和可靠的度，无论供气压力变化或条件如何，都能保持您所需的设定点。

Fairchild仙童常用型号如下：原装仙童FAIRCHILD减压阀念慈诚信供应

TDEI6000-415 

TD6000-416

TD7800-421

TD7800-406

10232C

Z16490-10222

20812

4044AH

65832型号升级65932NS

10202

10262C

10244

10263C 

GRH12-5-16X100-E3

15432

10262CHP 

TD6000-416

20832

100408

10262C

15432

10262C 

10232BP  

10262C

TDEI6000-415

TD6000-411

TA6000-002 TA6000-003 TA6000-004 TA6000-005 TA6000-006 TA6000-006U TA6000-011

TA6000-012 TA6000-016 TA6000-016U TA6000-021 TA6000-301 TA6000-303 TA6000-304

TA6000-305 TA6000-306 TA6000-314 TA6000-401 TA6000-401U TA6000-402 TA6000-402U

TA6000-403 TA6000-404 TA6000-404U TA6000-405 TA6000-405U TA6000-406 TA6000-406U

TA6000-411 TA6000-412 TA6000-413 TA6000-414 TA6000-415 TA6000-416 TA6000-421

TA6000-421U TA6000-422U TA6000-424U TA6000-425 TA6000-425U TA6000-501 TA6000-502

TA6000-503 TA6000-504 TA6000-505 TA6000-506 TA6000-701 TA6000-701U TA6000-702

TA6000-703 TA6000-704 TA6000-705 TA6000-706 TA6000-721 TA6000-901 TA6000-902

Fairchild Semiconductor MOC3020M

Fairchild Semiconductor TIL111M

Fairchild Semiconductor MOC3052SR2M

Fairchild Semiconductor HCPL2731

Fairchild Semiconductor MOC3063TVM

Fairchild Semiconductor FOD817A300W

Fairchild Semiconductor CNY172SR2M

Fairchild Semiconductor FOD817CSD

Fairchild Semiconductor 4N32M

Fairchild Semiconductor FOD8320

Fairchild Semiconductor MOCD217R2M

Fairchild Semiconductor MOC3052SM

Fairchild Semiconductor MOC3063SM

Fairchild Semiconductor FODM8801BR2

Fairchild Semiconductor FOD817D3SD

Fairchild Semiconductor FOD817A

Fairchild Semiconductor MOC207M

Fairchild Semiconductor MID400

Fairchild Semiconductor HCPL4503SDVM

Fairchild Semiconductor HCPL0501

Fairchild Semiconductor HCPL4503SVM

Fairchild Semiconductor FOD8316

Fairchild Semiconductor FODM3012R2_NF098

Fairchild Semiconductor HMHA2801AR2

Fairchild Semiconductor HMHA281R2

Fairchild Semiconductor FOD3180S

Fairchild Semiconductor HMHAA280R2

Fairchild Semiconductor 6N137SM

Fairchild Semiconductor 6N138M

Fairchild Semiconductor 4N25VM

Fairchild Semiconductor 4N25SR2VM

Fairchild Semiconductor 4N27SR2M

Fairchild Semiconductor 4N28M

Fairchild Semiconductor 4N28SM

Fairchild Semiconductor 4N25SM

Fairchild Semiconductor 4N26M

Fairchild Semiconductor 4N30M

Fairchild Semiconductor 4N27SM

Fairchild Semiconductor 4N35SR2M

Fairchild Semiconductor 4N35SR2VM

Fairchild Semiconductor 4N32SR2M

Fairchild Semiconductor 4N33SM

Fairchild Semiconductor 4N36M

Fairchild Semiconductor 4N35TVM

Fairchild Semiconductor 4N32SM

Fairchild Semiconductor 6N139M

Fairchild Semiconductor 4N26SR2M

Fairchild Semiconductor 4N27M

Fairchild Semiconductor 4N37SR2VM

Fairchild Semiconductor 4N38TVM