Has anyone tried the Chinese solenoids of Ebay? $7.95 http://www.ebay.com/itm/2V025-08-DC-12V-2-Position-2-Way-Solenoid-Valve-Electric-Pneumatic-Power-Control-/141005493411?pt=Pneumatic_Hydraulic_Valves_Parts&hash=item20d49514a3 $9.49 http://www.ebay.com/itm/1-8-DC12V-2-Way-Normally-Closed-Pneumatic-Aluminum-Electric-Solenoid-Air-Valve-/281363130823?pt=Pneumatic_Hydraulic_Valves_Parts&hash=item41828ca9c7 1Mpa = 140 PSI $19.00 http://www.ebay.com/itm/2-Way-2-Position-Solenoid-Air-Valve-1-8-NPT-12V-DC-MettleAir-/310478699292?pt=Pneumatic_Hydraulic_Valves_Parts&hash=item4849f8fb1c Keith
The first one is only rated for 113 PSI, too low for our uses. The second and third are only rated for 101 PSI. Too low for the 150 PSI that ships are required to run at. I don't think they would work for what we would use them for. C
150# is the maximum allowed pressure, not the required pressure. Fast gun ships usually keep the pressure fixed, and tweak the compression on the O-ring to control the firing power. Big gun ships adjust the pressure to control firing power of the guns to meet the penetration test (2" of foam, roughly 165fps for a 1/4" ball bearing), with a maximum of 150 psi. Although 113 and 101 psi is too low to be very useful for fast gun cannons, they can be used as the pilot valve to actuate a big gun cannon if you have a secondary regulator to reduce pressure to the firing system. Running the firing system at reduced pressure introduces more components for failure, and reduces the speed at which the cannons fire (which depends on the force of the actuator overcoming the force on the buna ball). In short, it could be used for big gun cannons, but it's not the best suited to the task.
I was reading the 0-10 kgf/cm2 that was printed on the solenoid from the 1st and 3rd. That would give 142 PSI. However that contradicts with the date provided in the add. At 142 psi it would be on the edge. Maby….
If you're looking for a cheap solenoid, check out this link. http://rcnavalcombat.com/Forum/tabid/58/aff/546/aft/443679/afv/topic/afnp/491708/Default.aspx A couple post down, there's some info on a cheap solenoid.
