quote:

I have had customers install valves backwards in the past

Now it's coming back to me... if you use a SUN or similar sandwich valve that uses studs, stud nuts and seal plates, the oversize holes in the sandwich body and the flexibility of the studs make it possible to mount the valve backwards.

Mirage: I thought you wanted to flip your dump valve. Why do you want to flip the proportional valve? You want the cylinders to extend in a regenerative fashion as a fail safe? (i don't think the speed would really be that fast as usually the fail safe has a low flow coeficient, but the diagram logic would sugest a rapid extend.)

Sorry, it’s my first experience with proportional hydraulic (electrical motion much easy), for big projects I invite hydraulic engineers from outside, with this small project (just 2-seat, motion hydraulic loaded approx . 300Kg (including cabin weight) -I hope is not very big deal ? ) so, I decide to do everything by myself, reason is “centenary live -> centenary qualify
Yesterday I take to pieces proportional valve module and understand my mistake now i studying integral electronic, inside driver card three modules, first one standard power supply, diode with capacitor 30V2200mF and two transistors for operating coil, second parts module is feed-back from position transducer, and some wires go directly to coil power supply and some wires go in third module, which one need investigate…., I don’t make any wiring & diagrams ( I decide better if before asking from you, maybe someone have electronic diagrams full option ready waiting for my question ))
- Also I have to order proportional valve, there is some comparable valves from another brands (BOSH, Rexroth, Parker, etc….)
First of all, by technical specifications where I have to concentrate? (valve body, spool size, or another more important thinks?) how by correct way make configuration of proportional valve & integral electronics card If all brand have different numeration and names, there is some kind of general specification ( as e.g. videoprojectors 3000 ANSI Lm, 1024x768, DLP: - just by this information salesman bring for you exactly product without any more explanation
-Approx. how much is price proportional valve in my situation? can be very helpful if you have some link where I can easy make configurations with price options, and easy make order (my location is KSA (Kingdom of Saudi Arabia) )

quote:

Mirage: I thought you wanted to flip your dump valve.

Dump valve....
-you mean main valve, correct?! Which one open flow for proportion valves, how it must work by safety-way? I think there is must be some kind automatic operated switch , regulating by pressure, if there is base no any motion and pressure in accumulator enough => dump valve automatic OFF! When base start move, pressure is down =>dump valve is automatic switched ON.
- by hydraulic experience probably must be some regular circuit diagram connection? Now (temporary) I operate dump valve manual connection ( micro switch with LED-indicator). main electrical motor I planning turn "ON" same time from running program (!) to the purpose:
- how long time is need from "turn ON" pump motor and first cylinder move ? (E.g. motion bases 1)electrical => immediately, 2)pneumatic=> need time to accumulate pressure, 3) hydraulic=>?)

This message has been edited. Last edited by: Mirage,

- Why you keep silence? Maybe I ask about some military top secret questions? Believe me I can’t find here in Dammam (KSA) any professional hydraulic engineer who knows proportional hydraulic.., I write letter “ATOS”, answer: -we work just with dialers… where “ATOS” dialers in KSA? In “DENISON” workshop give me very important information, says: -proportional hydraulic? Why? It’s very expensive! About similar specification, he give me more important information, I have to looking for valve size N6! In “PARKER“workshop living just roach and mouse….. (I can send you “PARKER” dialers workshop) , so I don’t understand, proportional hydraulic is military technology for USA & Canada Just ? or just in this forum living proportional hydraulic engineers ?
-by the way, I say: - I need just some time to understand system & good teacher, if there is some questions about money (what you ask several times) No problem, I paying not from my pocket, company pay…., I work in SARACO company (did you hear that ? ARAMCO & SARACO) If you don’t know this companies I want give for you just some information for future…, ,more than 50% gasoline for your car engines from our company provide !!!
-during this time I made some study, thanks for helping…, if with hydraulic proportional valve problems, I find another solution, using stepper motor for valve core control, and want ask you just your opinion by your experience, that it, thanks – 100x.

This message has been edited. Last edited by: Mirage,

I need just some information about principle position transduser, and after some-time I'll give you complit formula for internal external USB controlled proportional valve !

There is a free information about proportional and servo DCV in BudT e-book H/P home page.

It is hard to jump immediately into it without understanding some basic hydraulic principles/theories. BudT e-book has a general discussion of most hydraulic systems, but lacking some higher calculations and designing considerations.

If your company is rich(I know ARAMCO is one of the biggest saudi oil company) and willing to invest on its employee, they can send you to a month long hydraulic training in rexroth, vickers, parker, etc. Or if you are good enough, you can buy or your company can buy complete sets of hydraulic training books. There are a lot of companies selling hydraulic training aids, try to avail those.

A rexroth hydraulic training in Lohr Germany for one month is also possible, where they also give you complete set of hydraulic manuals(volume 1-6 or more).

Since money is not a problem to you or your company, you/they can hire expert hydraulic trainers to come to KSA. But it is best to go to their training facilities since they have their actual training facilities too. There are a lot of hydraulic training courses(for vickers, rexroth, etc) in the USA also. I will be surprise if rexroth or vickers KSA distributors doesnt offer hydraulic courses. Normally if a company is interested, the distributor can facilitate a training handled by experts from this product manufacturers at a cost. If your company is a good market for hydraulic components, this manufacturers also might give you a free general seminar since it is one way of maintaining customers.

I remember regional rexroth headquarter personnel from singapore often visited some local distributor and customers in our country and give this free seminars.

BudT e-book has some discussion of proportional/servo but have none about Atos type. Check it out.

Mirage,

Maglub has suggested that you do some research from BudT's ebook ...he neglected to point you via a link to the pages of this website that may contain the info you require...so just in case your not aware of what is available to read.

http://www.hydraulicspneumatic...le/True/6440/Sensors etc etc

Search "proportional" on this website.

quote:

428 items found for 'proportional'

Regards Woody

This message has been edited. Last edited by: Woodygb,

quote:

Believe me I can’t find here in Dammam (KSA) any professional hydraulic engineer who knows proportional hydraulic.., I write letter “ATOS”, answer: -we work just with dialers… where “ATOS” dialers in KSA? In “DENISON” workshop give me very important information, says: -proportional hydraulic? Why? It’s very expensive! About similar specification, he give me more important information, I have to looking for valve size N6! In “PARKER“workshop living just roach and mouse….. (I can send you “PARKER” dialers workshop) , so I don’t understand, proportional hydraulic is military technology for USA & Canada Just ? or just in this forum living proportional hydraulic engineers ?
-by the way, I say: - I need just some time to understand system & good teacher, if there is some questions about money (what you ask several times) No problem, I paying not from my pocket, company pay…., I work in SARACO company (did you hear that ? ARAMCO & SARACO) If you don’t know this companies I want give for you just some information for future…,

http://www.saudigulfhydraulics.com/

quote:

SAUDI GULF HYDRAULICS Co. Ltd. was established in 1987 as a Saudi-German venture, and is a prestigious company with ISO9001:2000 Certification, providing services of Manufacture, Repair, Service and Maintenance of Hydraulic Systems and equipment to numerous corporate and individual clients. Our client-base includes ARAMCO, SABIC and its subsidiaries, SCECO and a host of other reputed customers.

quote:

In addition, we also undertake service, repair and maintenance of Hydraulic Pumps, Motors and systems of VICKERS, DENISON, ATOS, CATERPILLAR, etc. etc

EDIT:-
http://www.gulfhp.com/en/

I really don't know if you'll find a local competent proportional hydraulic engineer willing to help/tutor you.

Regards Woody

This message has been edited. Last edited by: Woodygb,

Can’t login by old nickname
Yesterday I get good result soft -controlling “bang-bang” valve, there is two way:
1) Using two spring calibrating point (from first idea, which one was not correct…)
this calibration need to limit core slide distance between soft “ON” (start) and soft “OFF” (stop) position, and after that you can control motion easy from PWM,
2) If you need more accurate, you can make simple connection (from coil side) using thread-rolling tool and connect stepper motor, and you have sensitive control & calibrating most hydraulic valves (!)
And I have to say Thanks 100-x Woody, Maglub, Doug Hanson, AKKAMAAN …. & Mr. Peter Nachtwey
For helping me with my project! during this time I get good knowledge & some experience with proportional hydraulic, it’s very inviting section of mechanics, I hope be graduated from you in “PROPORTIONAL HYDRAULIC (members ) CLUB” as beginner

Best regards Mirage.

This message has been edited. Last edited by: RST,