Blain Hydraulics EV100 Series Panduan Servis - Halaman 10
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Halaman Cetak
EV 100 Service Manual
Purpose
In the case of the operation of the safeties in a 1:2 hydraulic lift system when the weight of the car is no longer carried
by the ropes, the electrical supply to the elevator must automatically be switched off. The K Slack Rope Valve avoids
the ram being lowered by the opening of the manual lowering valve which could otherwise cause a tangled rope
condition. The K Slack Rope Valve prevents the pressure holding up the ram from being evacuated through the
manual lowering valve.
Function
The K valve is adjusted to a pressure just above the pressure produced by the weight of the ram. When under
normal operating conditions, the weight of the car acts upon the ram through the 1:2 roping, the resulting pressure
is sufficient to open the poppet of the K valve when the manual lowering H is opened, allowing the car to descend
as required. When however the `safeties´ have operated and only the weight of the ram and sheave block are
acting upon the hydraulic system, the resulting pressure is too low to open the K valve. The ram and sheave block
can not be lowered.
Adjustment
The K is adjusted with a 3 mm Socket Key by turning the screw K `in´ for higher pressure and `out´ for lower
pressure. With K turned all the way `in´, then half a turn back out, the unloaded car should descend when the D
solenoid alone is energised. Should the car not descend, K must be backed off until the car just begins to descend,
then backed off a further half turn to ensure that with cold oil, the car can be lowered as required.
Manual lowering H
Adjustment Screw K
Down Flange 7 - 9
∅ 6 mm Ball K 5
Lock Screw K 2
Adjustment Screw K
Oct 02
BLAIN HYDRAULICS GmbH Boellinger Hoefe D-74078 Heilbronn Tel. +49 7131 28 21-0 Fax +49 7131 485216 www.blain.de [email protected]
Printed in Germany
Slack Rope Valve `K´
Plug Screw K 6
Spring K 4
0-Ring K 3
K
Adjustment
9
EN ISO 9001
8