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Sequence of Operation:
1. Press Idle – Dake Elec-draulic presses are operated through lever (11) after turning the
electric motor switch to "ON". This lever operated through its range provides ram speeds
from zero to the maximum rated pressing speed of the press. This is done entirely within
the pump (2) and does not require a variable speed electric motor.
2. Advance – When release valve (6) is closed, the fluid flows through the manifold and
check valve (9) to the eductor (5). As the oil passes through the restricted orifice of the
eductor (5). It "picks up" oil through the check valve (8), giving rapid advance.
3. Pressing – When the ram meets resistance, check valve (8) closes and maximum
pressure can be built.
4. Return – When pressing is completed and lever (11) is returned to zero speed, check
valve (9) closes and holds the hydraulic fluid above the ram until it is released back to the
reservoir (3) by opening the release valve (6). The ram spring then returns the ram to its
up position. In doing this the ram exerts a pressure on the oil and returns it to the
reservoir through the open release valve (6).
The relief valve (7) will automatically by-pass the oil back to the reservoir (3) when the oil
pressure exceeds system pressure. Check valve (9) holds pressure in the cylinder (4) when
relief valve (7) is open. The relief valve (7) is made so the pressure can be reduced to 1/2 its
normal operating pressure. By-pass hole in cylinder wall limits travel of ram and protects press
from breakage.
905050
15
Dake Corporation
724 Robbins Road
Grand Haven, MI 49417
www.dakecorp.com
REV112019
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