single piston effect

[nanneddu]

Hello everyone, I have a poblem on a catwalk. the piston that regulates the climb and the descent is simple effect, comes only a tube. In addition to the electrovalve that commands the function from the water control unit there is another electrovalve put at the exit of the piston that should serve to make as a lock valve. the problem is that when the control unit leaves and makes the electrovalve opening the catwalk sometimes falls also 60 cm from the horizontal line as if the oil went back without obstruction. I think the problem is due to the fact that when the card gives the consent to the solenoid valves to open the motor of the control unit has not yet pressed the plant, therefore causing the famous fall of itching. I thought I would somehow delay some fractions of a second the arrival of voltage to the valves or insert a piloted lock valve with simple effect, but where do I connect the opening pilot pressure tube? Help me thank you

 

[lollo3d]

Sorry, but... the lock valve must be mounted directly on the piston and is made specifically to prevent the fall... if the problem is not working either the valve or the lock valve that draws or is not a lock valve but a choker to limit the opening speed.

 

[Vash]

Hi.

for this problem there are two possibilities.

first possibility
delay the opening of the lock valve installed on the cylinder for a tarable time according to use (not very precise and difficult to manage according to temperature, etc...)

second possibility
install a device that can read the pressure of the system and give consent for the opening impulse of the valve installed on the cylinder, only when you reach a minimum pressure, e.g.: 50bar


I say this in reference to the fact that I am the owner of a company that builds cylinders and hydraulic components of various types and sizes; So I'm in the industry.


a little late, however I think I was helpful.:biggrin:

 

[Lollos]

Good morning
the solution of the problem is to mount a simple effect piloted lock valve directly on the cylinder and not an electrovalve.
As regards the connections, the scheme provides that the pipe for the ascent is connected on an operator of the solenoid valve of the control unit and then on the other of the two utilities of the control unit it is necessary to connect the tube that pilots the opening of the lock valve.
attention, this means that when you control the descent, the tube that drives the valve remains pressurized to the safety valve calibration value for the duration of the descent, but this is normal and inevitable.
I hope I've explained
cordial greetings
lollos