Valve Operation; Tong Motor; Backup - Farr KT5500 Technical Manual

KT5500 5- " T & CLInCHER® B
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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.
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