Introducing the 'SSW' System
This series of O-ring adapters, invented by DMIC in 1991, has become the
de-facto standard in high end power unit fabrication.
DMIC Customers Build The Best Power Units
It seems simple enough, ho hum ... adapters, until you delve a little deeper
and realize the flexibility in power unit design, the possibility of o-ring
sealed suction lines to 6" bore, repeatability of construction, and the
sheer breadth of what can be achieved.
Say goodbye to cavitation troubles and leakage from large bore NPT, not to
mention field warranty service related to weeping from the suction system.
Check out our SSW Application
Gallery for some ideas in real field applications !
The above assembly is characteristic of the ease with which one can achieve
an o-ring sealed 4 inch suction line.
Here's How DMIC 'SSW' System Works !
It's as easy as 1-2-3-4
Typically, any project involving a hydraulic power
unit begins with the reservoir. In almost every case, reservoir to pump
interface involves:
-
Reservoir Weld fitting
-
Shutoff Valve
-
Hose/pipe run to pump
-
Pump Inlet port fitting
'SSW' system makes it easy and inexpensive for you to
lay out a prototype reservoir, and with repeatability, later put the design into
mass production if you like. You can even change the spec from imperial to
metric, and the overall dimensions will stay the same. You can build a 2nd power
unit years later, that is identical to the first unit furnished. The weeping and
cavitation risk of a faulty NPT joint is eliminated with o-ring sealing at every
connection. Full porting means reduced heat generation and lower energy
consumption in operation.
It's true that Made In U.S.A. DMIC 'SSW' adapters cost more to manufacture
than the offshore NPT fittings they replace. But we all know that when you try
to be cheap, you often end up buying it twice.
Specifying 'SSW' on the inlet reduces design, manufacturing, skilled labor
and warranty service costs to a degree where the overall cost savings can dwarf
the minimal cost premium of the 'SSW" hardware installation.
Here's an overview of how 'SSW' System works:
Step 1 - Provision the Inlet / Shut-Off Valve Mounting Point 
 DMIC
furnishes a series of Suction Line Simplifiers in inline, 45°, and 90° versions.
For L-shaped reservoirs, our customers swear by the 'SNE'
90° Elbow version of the SNS.
Here is an 'SNS' inline adapter. To install it, cut
a hole in the reservoir above the silt line, and weld it in place, NPT side in.
The NPT thread you see is for installation of a baffle tube, or strainer with an
inexpensive close-nipple. NPT threads submersed within the reservoir are not at
risk of leakage, and permit the use of low cost plumbing fittings.
The pilot guarantees square welding, and because we are welding this adapter
in place before any valve installation is involved, the reservoir can be well
cleaned of spatter and residue. Heat damage to valves is eliminated as well,
since they are absent during the welding process.
When eventual valve installation occurs, the straight thread allows the valve
to be freely located in position. Use a spanner to tighten the swivel locknut,
and the valve is set the valve rigidly in place with an o-ring seal.
Step 2 - Install the shutoff valve
Choosing a DMIC 'BVAL' shutoff Ball valve allows
the designer to draw from a wide array of
pre-engineered accessories. Unlike throwaway shutoff valves, DMIC's low
pressure valves are purpose built for hydraulic service. Things like OSHA-compliant
lockout, position sensing, actuation, and special sealing are second nature to
DMIC. We ship custom optioned valves with deliveries in days, if not from stock.
Install the valve onto the male SAE thread of the installed reservoir Suction
Line Simplifier. Align the handle, and with a spanner wrench, tighten the
locknut.
You now have a shutoff valve with outstanding mechanical rigidity, o-ring
sealing, and unrestricted bore for low DP.
NOTE: For L-shaped reservoirs, you may have to remove the
handle to swing the valve. Only an allen key and slot screwdriver is required
Step 3 - Install the Hose or Tube connection to the shutoff valve
At the outlet port of the shutoff valve, two popular options are to go
directly to hose via Hose Barb, or to use a hose assembly incorporating SAE
Split Flanges. DMIC's 'SSW' System covers both possibilities, and even allows
you to butt weld an SAE 4-Bolt companion on the reservoir for a direct hose
connection. The possibilities are endless !
Here is the 'HBL', used to equip the SAE ORB
shutoff valve with a hose barb. 'SSE' 90° and
'EBS' 45° elbow versions are also available from
stock.
  
In cases where the designers prefer to use an SAE Split Flanged hose assembly,
instead of a run of hose, simply specify a 4-Bolt Flange
'FMC' inline adapter in place of the 'HBL'.
We now have a reservoir and inlet line terminated by a hose barb and are
ready to specify the connection at the pump inlet port.
All connections are O-ring sealed, even if the port is larger than the
standard SAE 2" limit, or if the port is the less frequently seen 3½" SAE as
used by some premier pump brands. The inlet assembly is mechanically rigid, and
can be easily cleaned to hydraulic standards to reduce startup filtration
stress.
Step 4 - Run the hose/tube, and mount the inlet hose/tube to the pump
The 'HBS' inline hose barb adapter, along with a
C.61 Split Flange kit such as DMIC's 'FSL',
completes the connection at the pump inlet.
  
If your pump uses an SAE ORB inlet port, another Thread to Barb adapter such
as 'HBS' in step 2, can be used.
 Designer's
Guide Available in Print, CD, or for Download !
Get a grip on your power unit layout challenges with DMIC's 'SSW System'
designer's guide. For a print copy or CD, please submit the form below.
Each section of the 'SSW System' catalog is available for download, from the
links at left.
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Delaware
Manufacturing
Delaware
Manufacturing Industries Corp.
