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PRESSURE GAUGE
Every Concord EPV valve is provided with a standard pressure gauge and a pressure gauge
isolating valve. It is recommended that the gauge be isolated from the pressure line by turning
the gauge isolating valve to “OFF”, unless the lift is being repaired or serviced. To return the
gauge to “ZERO” pressure before closing the isolating valve, rotate the gate valve with the
yellow handle to the “OFF” position. Open the manual lowering valve by pulling on the red
handle on the front of the valve. The gauge will return to “ZERO”. Turn the gauge isolating
valve to the “OFF” position. Return the gate valve to the “ON” position (parallel with the oil
line) with the yellow handle.
SLACK ROPE MONITOR (KS)
Each EPV valve is provided with a standard monitor to detect the occurrence of slack rope or
“loss of pressure” in the hydraulic system. This valve is usually identified as the “KS” valve or
function. The device is non-adjustable and is permanently mounted in the body of the valve,
accessible from the top. If required, the “KS” may be removed for servicing, but otherwise
needs no attention.
The KS valve meets the code requirements for preventing the operation of the DOWN direction
valves, as well as operation of the manual lowering valve or the DOWN direction solenoid(s)
(unless there is pressure in the hydraulic cylinder).
To test the KS valve, the technician must create a loss of pressure in the hydraulic system.
This can be done by manually setting the safeties on the car, or supporting the car on the rail
stops.
To test the manual lowering valve, just PULL on the red handle and observe the hydraulic
plunger. There may be a slight movement of the plunger as the remaining pressure bleeds off.
The plunger will remain in position while the manual lowering handle is held open. Some slack
cable may occur.
To test the operation of the DOWN solenoid, press the down button on the temporary buttons
connected at the pump control. There may be a slight movement of the plunger as the
remaining pressure bleeds off. The plunger will remain in position while the DOWN solenoid is
energized. Some slack cable may occur.
To reset the KS valve, simply raise the lift from the safeties and allow pressure to return to the
hydraulic system. The KS will automatically reset. The technician should take care that any
slack cable is carefully aligned with the sheave prior to raising the plunger.
NEGATIVE PRESSURE SWITCH
An optional device available for the EPV valve is a “NEGATIVE PRESSURE SWITCH”. (When
activated due to loss of pressure, an electrical contact will open the power supply to the
DOWN solenoid). This switch has been factory set, but adjustment on site is possible.
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