Stanley 76501-02000, Manual

Page: 66 / 85

7
Relief Valve Adjustment Instructions
VE/VA Series Torque Wrench Valves
Single Solenoid Models
L2908_STANLEY Rev. Uncontrolled 03/22
For valve date codes beginning with "A" (electric 24 VDC models only).
For valve date codes beginning with "B" (all other electric and air models.)
1.0 INTRODUCTION
The VE/VA Series torque wrench valve contains two relief valves,
a user-adjustable main relief valve, and a separate “B-Port” relief
valve .
• The Advance Pressure Setting is determined by the
setting of the user-adjustable main relief valve .
• The
Retract Pressure Setting
is determined by the setting of
the B-port relief valve . This setting should only be adjusted
by qualified hydraulic service personnel .
Refer to Figure 7 for relief valve locations .
Note: Relief valve handle will rotate only about two-thirds of a full
turn . When rotation stops, pull up on handle to disengage . Then,
reposition and re-engage handle to allow additional adjustment
(as required) .
WARNING: On (-Q) and (-QM) pumps, ensure all
couplers have the protective caps fully installed before
starting pump .
4 . Connect power to pump . Wait until the microcontroller
powers up and “READY” is displayed on the LCD screen .
5 . Using the LCD screen and keypad, verify that Automode is
OFF or that the “Hi Press” value is set to a minimum of 100
psi [7 bar] higher than the desired relief valve setting (Refer
to pump instruction sheet for additional information) .
6 . Press and hold the pendant advance button . Pressure will
begin building in the advance (A-Port) circuit and a pressure
value will be displayed on the LCD screen .
7 . While continuing to hold down the pendant advance button,
SLOWLY rotate relief valve handle clockwise, to increase
pressure, or counter-clockwise to reduce pressure (as
required) .
Figure 7 Relief Valve Locations
2.0 ADJUSTING THE MAIN RELIEF VALVE
(Advance Pressure Setting)
The main relief valve limits the maximum A-Port advance
pressure by redirecting the pump's oil flow to the reservoir when
the user-adjusted pressure value is reached .
Adjust the main relief valve pressure as described in the
following procedures . For ZU4 Pro and ZE4 Pro electric torque
wrench pumps, refer to Section 2 .1 . For ZU4 Classic electric
torque wrench pumps and ZA4 air torque wrench pumps, refer
to Section 2 .2 .
2.1 ZU4 and ZE4 Pro Electric Torque Wrench Pumps
(equipped with LCD)
1 . Disconnect all hydraulic hoses from couplers on valve .
2 . Loosen the relief valve locking nut . See Figure 8 .
3 . Rotate relief valve handle counter-clockwise as required,
until there is little or no resistance when turning . When this
occurs, the valve is at its lowest setting .
Figure 8, User-Adjustable Relief Valve (typical)
8 . Release the pendant advance button to allow the system
pressure to return to the B-port retract setting . The motor
will continue to run .
User-Adjustable Main Relief Valve
(A-port advance pressure adjustment)
B-Port Relief Valve
(retract pressure adjustment)
Pull up to
disengage.
Locking Nut
Decrease Increase