Farr KT5500 - Valve Operation

KT5500 5-
1
/
2
” Tong & CLInCHER® BaCKup
SECTIon ConTEnTS
2.22
TECHnICaL ManuaL
SETup & opERaTIon
3. Valve Operation 
4-wayproportionalvalvescontroloperationofhydraulicdevicesonthetongassemblysuchashydraulicmotorsandcylinders.
Whenanyonevalveis“centered”orinthedetentposition,thereisnohydraulicoutputfromthevalve.Whenthevalveispushed
forwardthereisaneffect,andwhenthevalveispulledback,thereisanoppositeeffect.Thesevalvesfeatureproportionalcon-
trol,whichmeansthatfurtherextensionofthevalvehandle(therebyfurtheropeningthevalveorifice)resultsinproportionally
higherhydraulicoutputtothecontrolleddevice.
Thefollowingillustrationdemonstratesthetypeandeffectofthehydraulicvalveswithwhichthistongismaybeequipped.
TONG MOTOR
Thisisaproportionalvalve.Pushingthevalvehandleforwardwillcausethetongmotortorotateinaclockwisedirection(as
seenfromthetopofthe tong). Thisisthedesireddirectionofrotation for makingupajoint.Pullingthevalve handle inthe
oppositedirectionresultsincounter-clockwiserotation,whichisthedesireddirectionofrotationforbreakingoutajoint.
BACKUP
Depending onthe typeof backup with whichyoursystemis equipped(Wedge, Clincher,orHydraulic)pushingforward on
thisvalvewillextendthebackupcylinder(s),oractuateasequencevalve.Pullingbackward,towardstheoperator,reverses
theaction.