Hydraulic Restrictor Orifice

[AKKAMAAN]

A common problem with these small orifices, is that they easy "clogg"....

I have used this design with success.....drill the orifice to a larger size, and put a steel wire trough the hole, and bend the ends of the wire...the cross area difference between the hole and the wire, will be the net orifice opening.....and this wire will work it self back and forth to keep the orifice open.....
The picture shows an orifice through a pin screw...

 

[Gizmo2]

Cool

 

[J_J]

Like Kenny said, a needle valve should work fine. They are adjustable from closed to full open, but they are not cheap. Just adjust till you are satisfied.

https://www.surpluscenter.com/item.asp?item=9-5302-25&catname=hydraulic

 

[kennyd]

OK thanks. I am at work also (being quiet)

Search the term "restrictor" at this website. Good people, I have ordered from them before.

Hydraulicstore.com - Call toll-free 877-778-3533 Mon-Fri 7:30-5:00 Sat 7:30-12:30 Central Time ___________

 

[Gizmo2]

Search the term "restrictor" at this website. Good people, I have ordered from them before.

Hydraulicstore.com - Call toll-free 877-778-3533 Mon-Fri 7:30-5:00 Sat 7:30-12:30 Central Time ___________

 

[Gizmo2]

$2.25, Connector steel orifice 1/4" male pipe x 1/4" female NPSM. Thanks KennyD

 

[IceStationZebra]

Two things.

First, there are floating disc orifices like your picture out there. You get the orifice in one direction and near free flow the other. One application is putting two different orifices on either end of a cylinder to account for the different effective areas. Unfortunately I do not have a source.

Second, a quick/dirty/cheap method is to put a female hex pipe plug inside of a fitting that is already in your system. I have had good luck doing this with male JIC fittings, SAE fittings, etc. Remove as little metal as possible when tapping the fitting, but make sure it don't move. Then just drill out what you want. You can also put in a new plug if you got the hole too big.

ISZ

 

[SPYDERLK]

Two things.

First, there are floating disc orifices like your picture out there. You get the orifice in one direction and near free flow the other. One application is putting two different orifices on either end of a cylinder to account for the different effective areas. Unfortunately I do not have a source.

Second, a quick/dirty/cheap method is to put a female hex pipe plug inside of a fitting that is already in your system. I have had good luck doing this with male JIC fittings, SAE fittings, etc. Remove as little metal as possible when tapping the fitting, but make sure it don't move. Then just drill out what you want. You can also put in a new plug if you got the hole too big.

ISZ

I use a stainless steel set screw drilled for the proper size. Drill before installing. I bought a few each in fine thread sizes from McMaster Carr. For extremely lo flow - like to my system pressure gauge directly off the pump I have used a setscrew with no hole and just let it follow the threads thru. I havnt had it clog and its been on for years. I certainly acknowledge the possibility in so small a flow path.
larry

 

[PILOON]

A restrictor is also easy to make if U can't find them locally.

Simply weld a male female fitting closed and then drill a smaller hole to restrict.
If U start off too small simply use the next size drill bit.

My supplier did not stock restrictors so I made one to slow down a snow blower chute rotator. Worked just fine.

 

[ruffdog]

I just bought 2 blank fittings (1/4) from the bobcat dealer for $3.20 each. the #1404-4-4-blank. Here is a site with those fittings:

144 ADAPTERS - MALE SWIVEL WITH ORIFICE | Trausch Dynamics