PMW pressure regulator solenoid

[Jake11]

Hi folks,
Just wondering why I have a restrictor before my pressure regulator solenoid. What effect does increasing the size of the orifice do to the output pressure and rate of change of the output to the regulator signal change?
[tt]
_____ __________________
\_/
in _ out
_____/ \______ ________
| |
| |
___|__|___
| |____
| PWM __ |
| solenoid | | |
|__________| vent
+ -
[/tt]
Thank you

 

[dbaird]

I would guess that this orifice purpose is either filter and/or pulsation dampening device.

David Baird

Sr Controls Designer
EET degree.
Journeyman Electrician.

 

[Jake11]

The previous stage comes off a pressure regulator (pressure reducer). The next stage controls valve pistons only.

I suppose that enlarging the orifice will make for quicker response for a closing PWM solenoid but slightly higher pressure also?

Sorry, should say that this system is oil.

 

[JimCasey]

Without that orifice, the capacity of the solenoid would have to be much larger. The small solenoid would not have the desired effect on the system pressure. Similar orifices are used in pneumatic devices and other "piloted" devices to allow a small valve to have an amplified result with regard to pressure.

 

[Jake11]

Thanks JimCasey, this make perfect sense. My problem is that I still need the next stage to react a little faster. Without increasing the 'in' pressure would slightly opening the orifice make for quicker pressure application to the next stage pistons? I believe yes. I also think that the pressure variance will slightly increase at the output.