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Interchanges
If you are experiencing hydraulic
supply or performance problems with one of the “Big 4 “ product
offerings which may include delivery, price and ability to perform as
promised, Flow Dynamics now offers interchanges for many specific
products. We do not warranty the exact interchange of these products,
however we simply lay out the facts of comparison according to the
manufacturer of the interchange.
Hydraulic pumps: All SAE standard hydraulic pumps
have basic configurations in common that are the basis for interchange.
They include shaft diameter, keyway and length. The mounting pads are
standard as well and are either 2 or 4 bolt and SAE size A, B, C, D, E,
& F. The majority of pumps are A-D. The suction, pressure and drain port
size and location are different on every pump. While this may sound like
a major obstacle, it is only a consideration if your existing pump is
plumbed with hard pipe or tubing. If you are unwilling to modify that,
you must replace with the same pump. Using hard plumbing is not good
hydraulic design practice. It limits your ability to replace the pump
with other manufacturers; it resonates noise from the pump to the
reservoir; and causes leaks due to vibration of the pump motor group. In
short, if your pump is hard plumbed, we recommend that when you replace
the pump, you install hose on the first run from the pump to the power
unit on all ports. This will isolate the vibration to the prime mover.
Hydraulic valves: Valves
must be classified as industrial or mobile. This discussion, will be
limited to industrial. There are basically two considerations in
interchanging subplate mounted valves. Fit and function. Directional
valves are the same fit between all manufacturers and correspond to both
SAE and European Convention (ISO-Cetop). Directional valves are either
switching, proportional or servo. Once the physical mounting has been
determined, the functional characteristic of the valve must be
interchanged. With a variety of functions built into modern valving, it
is necessary to pay close attention to the performance of each
interchange. Flow, pressure ratings, response times, etc play into the
process. We here at Flow Dynamics have the
expertise to change a simple switching directional valve to a better
solution as well as the more complicated proportional and servo valves
to either Moog or Atos, depending on the requirement. The service after
the sale, in particular for proportional and servos is extremely
important. For example, several years back Moog made the decision to
delete the sale of parts for their servo valves. Independent servo
repair houses were repairing Moog servo valves to a substandard level.
Moog's’ reputation for producing only the highest quality servo valve
was being tarnished, so Moog opened it’s own factory repair center that
can turn a Moog, Atchley, Pegasus and Dowty servo valve around in three
to five working days and quicker if necessary. Each repair carries a new
2 year warranty and a report of what was done to the valve and
recommendations for better performance. Moog also offers an in-place
servo valve tester to help our customers determine if the problem lies
with the valve or elsewhere in the system.
You can trust Flow Dynamics with
your hydraulic problems. We can interchange virtually any hydraulic pump
and valve. If necessary, we can dig further in the system to uncover
problems and recommend solutions. Simply fill out the data box and
submit it to our staff. Please give us all the information possible to
insure a good cross over.
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