Flowserve V-377 R4 Edward Valves - Manual (Page 24)

Limitorque Limit Switch and Torque
Switch Setting Procedures
The following descriptions apply only to
Limitorque valve controls. If another type
valve control is used, the appropriate man-
ual should be consulted to determine the
proper setting of the limit switch and
torque switch.
Geared Limit Switch
See Illustration No. 18.
Numbers in parenthesis ( ) refer to call-
outs on Illustration No. 18 on this page.
When reassembling the Limitorque valve
control, the rotor type geared limit switch
should be reset as follows:
1. Make certain the electric current is
off.
2. Open the valve by hand until the
valve disk strikes the back seat. Note
the direction the intermittent gear
shaft (D) is turning. This slotted shaft
is extended through the gear case
and can be seen just above the rotor
connected to the open coil.
3. Back the valve off to allow for coast
of the moving parts.
4. With the valve in this position,
declutch the drive pinion (A) by
inserting a screwdriver in the drive
pinion setting rod (B) and turning
clockwise until it is tight.The intermit-
tent gear shaft (D) can now be turned
by inserting a screwdriver in its slot.
5. a. Turn the intermittent gear shaft (D)
in the same direction as noted
when the valve was opened until
the contact on the rotor (C) con-
nected to the open contactor cir-
cuit opens.
b. In the event this contact is already
open, turn this shaft in the oppo-
site direction until it closes; then
back off on the shaft until the con-
tact opens.
6. Unscrew the drive pinion setting rod
(B) until it reaches a firm stop, but do
not jam. This train of gears and con-
tacts is now set.
Ꭽ Ꭾ Ꭿ ൳
Illustration No. 18
Limitorque Geared Limit Switch Assembly
WARNING
SHOULD IT BECOME NECESSARY TO
CHANGE THE TORQUE SWITCH SETTING
FOR ANY REASON, THE LOCAL EDWARD
REPRESENTATIVE SHOULD BE CONTACTED
AND HE WILL OBTAIN FROM THE FACTORY
THE CORRECT NEW SETTING.
THE TORQUE SWITCH FOR THE
MOTOR -OPERATED VALVE IS SET DURING
FACTORY ASSEMBLY TO CLOSE THE VALVE
AGAINST THE SPECIFIED UNBALANCED
PRESSURES AND REQUIRES THE SAME
ATTENTION FOR RESETTING.
24
Flow Control Division
Edward Valves
Procedures for Setting Actuator Torque and Limit Switches