muddstopper
Veteran Member
I have a parker v70, model v70-248-G, air shift and lever shift control valve. I got the valve out of a scrap bin but it is a new valve never been mounted on anything. Supposely the valve is open center, but i have been also told it is a closed center. Both fellows telling me this should know, but neither is really sure.
The red cap on top of the valve is In, the blue cap is out, the ports with fittings are A and B. There is also another port on the side of valve, with another red cap that is not marked. There are reliefs for IN port as well as both a/b ports . I can blow air in the IN port, but air doesnot come out the Out port. Ok looks like closed center, but instead of air coming out the OUT port, it comes out the port with red cap on side of valve and below OUT port. there is a plug between the out port and side port that can be removed. Power beyond plug????. If I hand shift valve, air seems to come out the a/b ports, but the in port is so lagre, I cant really tell if anything is coming out of the A/B ports, but I can hear the air change directions inside the valve and only reasonable suggestions is that the air is passing thru the A/B ports. Air is not coming out the side port or the out port when valve is shifted. I dont know what to make of this valve, I am thinking it is indeed a open center valve and the plug between the out port and the side port is for possible power beyond. On the other hand, the relief on the in port could be for pressure sensing and might be set for 650psi for use as a closed center valve. Need a little help with this one. I thought about just finding some fitting and hooking a water hose to the IN port, with such large ports, it hard to get enough air flow thru the valve to really tell whats going on.