Thanks Bud.
It will also help when industry learns the value of having trained people on their own staff to protect them from bad design. The company mentioned in my note is relatively small but it can be demonstrated that they have lost $2,000,000 over the last 10 years in wasted energy...
If you have a problem with static seals leaking over time, you may want to look at the energy loss in the system.
I had a discussion with a plant engineer in which he told me that O-rings leak but NPT fittings do not. On further examination, it was learned that there is a great amount of heat...
Hydrosoft Corp. produces the software. You can contact them at:
608 S. Main Ave.
Kankakee, IL 60901
Phone: (815) 933-8840
Fax: (815) 933-8861
Dan Helgerson CFPS, AFPI, AJPP
www.cfpsos.com
Paul,
Thank you for using this forum. The issues would seem to be the quality of the machined parts and the knowledge of the person doing the assembly/re-assembly. The sealing is all done by the O-rings and there is no metal-to-metal contact in the flow path of the fluid. There is a tendency...
Maytag,
I am not suggesting that there was any intentional dangerous advice. I am just giving a general warning about the use of pressure-reducing valves.
As you know, a pressure-reducing valve is really a pressure sensitive variable orifice. It is a normally open valve that begins to...
I have spoken to many plant managers about their Fluid Power Systems. I ask them if they would allow anyone but an electrician to open up a panel to address an electrical problem. I then ask why they think nothing of hiring some person off the street, hand him a wrench and say, “Go fix my...
There is a new certification program from the Fluid Power Society specifically for conductors and connectors. The major manufacturers of hoses and fittings got together and asked the Fluid Power Society to establish a training and certification program to address some of the very questions you...
Pmf contacted me outside the forum to get some information specific to his needs. We had some dialog and I am placing some of the information here in the forum for all to see. I hope you find it useful.
Hi Dan,
Can you please give me some help on this simple question? I've been
fishing for...
Losty
Some years ago, Vickers published a booklet on preventative maintenance with filtration. It was designed to promote the sale of their filters but it contains some very useful information. It is a 33 page document in .pdf format. It is available on the Eaton web site at...
Let me explain. I was reviewing some of the information being given to this request and I was concerned that it may have proved to be discouraging to “Rockjoint”. One of the primary reasons I started and maintain this forum is to promote the proper use of Fluid Power. It appeared to me that...
Rockjoint,
I would be happy to give you some help on this project. As you ask questions, I will give you answers and the reasons for the answers. That will help you build a knowledge base. I will also give you links to products that will meet your requirements. I can also provide...
Response to bvuk.
You asked if there is a book that I would recommend for calculating the generation of heat in hydraulic systems. My first choice would be to have you get a copy of the “Lightning Reference Handbook” which is available through the Fluid Power Society. You can find it at...
Generally speaking, a pressure compensated pump is a piston pump, usually with 9 pistons. The pistons are housed in a chamber very much like an old fashioned revolver where six bullets are stored in a rotating chamber. Each of the pump pistons has a “foot” that has a swivel joint. The foot is...
It seems to me that you have the necessary information for a vendor to supply the correct components. The “Safety Valve” needs to be able to relieve the maximum flow at the design pressure. The directional control valve needs to be rated for the design pressure and flow.
The vendor is likely...
The primary advantage of running cylinders in series is the inherent volumetric efficiency of cylinders. The amount of internal leakage in most cylinders approaches zero. This means that for any given motion on the master cylinder, there is a known volume of liquid moving all subsequent...
Take a look at www.nfpa.com. They post sales and trend figures for the Fluid Power Industry. This information is also published in each issue of the Fluid Power Journal www.fluidpowerjournal.com.
Dan Helgerson CFPS, AFPI, AJPP
www.cfpsos.com
This has been a very informative and frustrating string. It seems clear from the comments as well as from some informal research that I have done that few people who actually need it are finding their way to the Fluid Power Society and the proper certifications that are available. The people...
In effect, the first cylinder is acting against the entire load. It has to push its own portion of the weight and at the same time apply enough force to move the other cylinders. You are correct that the opposing pressure on the other side of the piston cancels out the additional force that...
I saw a discussion started about running cylinders in series for synchronization. Budt responded but now I cannot seem to find the thread. Bud knows his stuff. I just want to clear up a point. When hydraulic cylinders are run in series, the first cylinder sees the entire load while each...
Efficiency is another issue to consider. Many of the lower cost low speed, high torque motors are quite inefficient. Finding a motor that is efficient at the low end and still within an acceptable price range is challenging.
Dan Helgerson CFPS, AFPI, AJPP
www.cfpsos.com
