DESTACO offers two basic hydraulic pump types – electric and air powered – plus an airpowered booster. DESTACO also has a line of control valves for use with these pumps. The valves have virtually zero leakage and are ideally suited for constant pressure hydraulic workholding systems. Note that valves with internal leakage (such as spool valves) are not appropriate for use with DESTACO pumps and pallet valve systems.

Electric/Hydraulic Pumps

All of DESTACO’s Electric/Hydraulic Pumps are twostage, continuous pressure (demand) pumps that contain all the necessary controls and circuitry for powering any singleacting or doubleacting, continuous pressure workholding system. They contain a pressure switch and pressure regulator, and each is infinitely adjustable throughout the operating pressure range of 1,000 to 5,000 psi. An internal safety relief valve prevents possible damage from exceeding the maximum rated pressure.

The first stage provides high flow at low pressure to rapidly extend clamps and cylinders. The second stage piston pump builds and maintains pressure in the system at a preset level. The pump’s electrical controls include a RUN/JOG switch. When the pump is started in the RUN mode, it automatically starts and runs any time the pressure switch indicates the need for oil. When pressure builds to the switch setting, the pump stops until the next demand for oil lowers the pressure, causing the switch to start the pump again. The pump continues to cycle in this manner without operator intervention.

In the JOG mode, useful for set up and special applications, the pump will run only when the operator activates and holds the start switch. When released, the pump will stop immediately. If the pump builds pressure to the pressure switch setting, it will also stop. The pump cannot be forced to run after the pressure switch setting has been reached in either the RUN or the JOG mode.

Pumps having thermal overload protection have an integral “electrical shutdown” circuit which prevents the pump from restarting without manual intervention after either thermal overload or electrical service interruption.

Motor electrical specifications are listed for each pump. For voltages and frequencies not listed, contact us for more information
An optional fluid level temperature gauge is available. See page 81.

DESTACO’s Air/Hydraulic Pumps are all continuous pressure, reciprocating, stalltype pumps: air pressure is simply converted to hydraulic pressure. Operated by any compressed air source, these singlestage reciprocating pumps save energy by stalling when pressure is developed, and require no energy use to maintain system pressure.

Pumps of this type typically have much more usable oil capacity than ordinary boosters. Boosters stop after only one stroke, and if pressure is not built by the end of the stroke, or if any leakage is present, system pressure will not be maintained. DESTACO air/hydraulic pumps will maintain pressure levels because they continue to reciprocate until pressure develops. Once pressure is developed, the pump stalls and maintains consistent system pressure. If additional flow is necessary for maintaining pressure, the pump will again reciprocate any time the end of its stroke is reached.

Selected DESTACO air/hydraulic pumps come with an air supply filter/lubricator/ regulator for making hydraulic pressure adjustments.