fluidpower1

Try these sites to see if this is what you are looking for: http://webstore.ansi.org/ansidocstore/find.asp? http://www.iso.org/iso/en/ISOOnline.frontpage The ISO page has 1219-1 & 1219-2 to cover schematic drawings I know. How much more I have neve found out.

Mount the Directional Control Valves on all air powered actuators directly to the actuator. Any length of line between the valve and the actuator port is being filled and exhausted each cycle without doing any work. The bigger the line the greater the energy waste. The best approach is a port mounted valve on each actuator port so a minimum amount of air is wasted each cycle. Any hydraulic circuit with a HEAT EXCHANGER is an energy waster. You are not only paying for extra energy to heat the oil but paying for some method to cool it. You can see an article I wrote many years back on my web site. It explains all the ways to design a circuit to reduce energy and heat. www.fluidpower1.us

You can get them here: http://hydraulics.eaton.com/sicv/sicv_body.html Also, you can get info on ISO Fluid Power symbols at this site: http://www.iso.org/iso/en/CombinedQueryRes...d+power+symbols http://www.iso.org/iso/en/CombinedQueryRes...ryString=1219-2 I think Bosch-Rexroth has a set also: http://www.boschrexroth.com/

Definitions from Hydraulics & Pneumatics "Fluid Power Handbook & Directory" Glossary "Cylinder, piston type — A cylinder in which the piston has a greater cross-sectional area than the piston rod." Added by me: Usually Double Acting (Can have force Extending/Retracting) Can be a single Rod or have Rod's extending from both ends "Double Rod Cylinder." "Cylinder, plunger (ram) — A cylinder in which the piston has the same cross-sectional area as the piston rod." Added by me: Always Single Acting, must be returned by an external force. Can be Single Acting Extend or SIngle Acting Retract but are always SINGLE ACTING. It's in the book.

One thing no one has addressed about long lines is the amount of extra compressor volume required to fill these lines each cycle. Unlike lines filled with oil the air in each line to an actuator must be filled and exhausted each cycle to make the actuator move. Doesn't sound like much but on small cylinders it can be two or three times what it takes to run it. Mounting valves directly to the actuator not only reduces response time but saves air and keeps from over working the compressor or having to add more compressors to keep up with the wasted energy. Another response reducer is valves with Solenoid/Pilot operators. A solenoid valve receives the signal from the Control Circuit and shifts quickly. However, nothing is happening at the actuator until the Pilot Operated portion of the valve shifts to redirect air flow. This action is normally in miliseconds but always adds cycle time to the operation. Direct Solenoid Operated Valves alway respond faster but are no match for long air lines. I have found that using a regulated supply to cylinders that have a heavy load in one direction and are driven by that load when reversing can reduce cycle time and make the load forced portion of the cycle much smoother. It's in the book.