4
Figure 4
- Flowpath of the valve positions and operations for Model P8701 & P8701M.
Position 1:
Pressured
oil flows to port A, port B
returns flow to reservoir
Position 3:
Pressured
oil flows to port B, port A
returns flow to reservoir.
Position 2:
Neutral,
ports A and B are
closed. Hold Position.
Port B
Port B
Port B
P R
P R
P R
(b) 4-way, 3-position valve for Double Acting Cylinder (P8701M)
Position 1 (Advance):
Pressured oil flows to
port A.
Position 3 (Retract):
Port A returns flow to
reservoir
.
Position 2 (Hold):
Neutral, port A is closed.
Hold Position.
Port A
Port A
(a) 3-way, 3-position valve for Single Acting Cylinder (P8701)
Port A
Port B
3
1
2
P R
P R
P R
Port A
Port A
Port A
Port A
OPERATION
WARNING:
ALWAYS monitor pressure, load or position
using suitable equipment. Pressure may be monitored by
means of an optional manifold and gauge (contact BVA
Hydraulics). Load may be monitored by means of a load cell
and digital indicator. Correct application position can only be
determined by the operator of the equipment.
1. Remove the threaded plug, then connect the pump to
suitable application.
2. Ensure the oil level is correct and the system fittings and
connections are leak free before operating the pump.
CAUTION:
NEVER operate pump with release valve closed
and disconnected from application. If operated in this
condition, the hose and connections become pressurized.
This increases burst hazard. Damage may occur to pump
and its components
3. For model P8701:
A. Close release valve by turning it clockwise. Finger tight
ONLY. Using tools on release valve can damage it and
cause the pump to malfunction.
B. Handle until desired pressure, load or position is reached.
C. Pressure will maintain until the release valve is opened.
D. To retract application, turn the release valve knob slowly
counterclockwise (never more that 2 full turns).
4. For model P8701M:
Use the control valve lever to control the direction of hydraulic
oil flow, refer to Figure 4a on page 5. Handle until desire
pressure, load or position is reached.
WARNING:
Operate double-acting cylinder only when
both hoses are connected to the pump. If on coupler is left
unconnected, high pressure will build behind the coupler
which could cause personal injury and/or equipment damage.
5.
Under no load or 1st stage condition, the pump operates in
high flow for rapid advance. When load is contacted, the pump
will automatically shift to the 2nd stage for building pressure.
When pump pressure reaches approximately 290 psi, you
must momentarily stop pumping and raise the handle to shift
to the high pressure stage. After the pump shifts, pumping
takes less effort.
NOTICE:
operate pump handle at slower speed during the high
flow 1st stage to ensure the pump delivers maximum oil volume.
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