xtal01
Mechanical
- Mar 15, 2012
- 143
I can't thank you all enough for your help!
I have one question left but my "gut" feeling is that the factory engineers may be giving me bad advice.
Just to review, I am planning on using a Brand Hydraulics EFC ( electrical proportional control valve ) to set the rate of lift / lower on a simple forklift cylinder.
In the power up mode, I will use it as a three port valve.
In the gravity lower mode, I will use it as a two port valve.
On the manual version of this valve ( FC51 ) you can simply block the EX port ( excess flow port ) and use it as a two port valve.
On the Brand web site I read:
2-PORT- The 2-port (2P) option is a modified version of the standard 3-port EFC. This option lets the
customer use the control flow port while the excess port is plugged. A special compensator spool was
designed to eliminate hunting that can occur between pressure compensated valves and pumps. To use the
EFC 2-port a pressure compensated pump is required. The 2-port can be converted to a 3-port (by
removing the EX plug), but it will not have the same characteristics as the standard 3-port. (See chart on
next page for 2-port EFC)
After reading this, I checked with Brand. The Engineer at Brand says I can ignore this and just order the standard EFC valve.
Hmmmm .... so why even have this option at all? Does this not tell me that I "need" to have this if I am planning on using it as a two port valve?
Maybe I am just reading too much into this but I just don't understand why they would give you a "2P" option if you don't need it.
Can you guys straighten me out please!
I have attached a diagram of the flow up and down through my circuit.
Mike
I have one question left but my "gut" feeling is that the factory engineers may be giving me bad advice.
Just to review, I am planning on using a Brand Hydraulics EFC ( electrical proportional control valve ) to set the rate of lift / lower on a simple forklift cylinder.
In the power up mode, I will use it as a three port valve.
In the gravity lower mode, I will use it as a two port valve.
On the manual version of this valve ( FC51 ) you can simply block the EX port ( excess flow port ) and use it as a two port valve.
On the Brand web site I read:
2-PORT- The 2-port (2P) option is a modified version of the standard 3-port EFC. This option lets the
customer use the control flow port while the excess port is plugged. A special compensator spool was
designed to eliminate hunting that can occur between pressure compensated valves and pumps. To use the
EFC 2-port a pressure compensated pump is required. The 2-port can be converted to a 3-port (by
removing the EX plug), but it will not have the same characteristics as the standard 3-port. (See chart on
next page for 2-port EFC)
After reading this, I checked with Brand. The Engineer at Brand says I can ignore this and just order the standard EFC valve.
Hmmmm .... so why even have this option at all? Does this not tell me that I "need" to have this if I am planning on using it as a two port valve?
Maybe I am just reading too much into this but I just don't understand why they would give you a "2P" option if you don't need it.
Can you guys straighten me out please!
I have attached a diagram of the flow up and down through my circuit.
Mike