nickjk
Mechanical
- May 10, 2007
- 74
I am having problems with a Spring seated check ball used in a low volume low flow (130 cubic in./min max) hydraulic device.
The device uses a .250" steel ball, 4.4 lb spring with a 54 lb/in spring rate, 118 degree included angle seat with a .0147 sq. in. contact area.
The original design intent was to prevent the actuation of the device until a pressure of 300 psi has been reached.
My problem is there appears to be a large pressure drop in the device after the check ball.
With the check ball installed the device engages at approx 640 psi.
With the check ball removed the device engages at approx 420 psi.
What could be causing the large 33.4% pressure drop, could it be caused by the spring rate?
Any ideas would greatly be appreciated.
Thanks in advance,
Nick
The device uses a .250" steel ball, 4.4 lb spring with a 54 lb/in spring rate, 118 degree included angle seat with a .0147 sq. in. contact area.
The original design intent was to prevent the actuation of the device until a pressure of 300 psi has been reached.
My problem is there appears to be a large pressure drop in the device after the check ball.
With the check ball installed the device engages at approx 640 psi.
With the check ball removed the device engages at approx 420 psi.
What could be causing the large 33.4% pressure drop, could it be caused by the spring rate?
Any ideas would greatly be appreciated.
Thanks in advance,
Nick