Hello,
I'll offer the following in the hopes of helping someone else who is working on a Titan from avoiding a problem I encountered.
Today I assembled a Titan First stage using a 900001 service kit for VDH. Per COUV's suggestion I checked the HP side for leaks. No bubbles, cycled the seat via the pin several times and still no leaks.
Some notes on o-rings. The o-ring in the kit for the crown/orifice (820038) seems a bit small as the crown slides rather easily into position. However, I measured the old o-ring and it is very close to a 1.9 x 7.8mm. I measured 1.86 x 7.8 mm on the old one. The new o-ring is a 1.9 x 7.8. It feels like a duro 90.
The -006 o-ring for the spring block felt softer than the duro 70 o-rings I compared it to.
Regarding the -006 o-ring, the manual states "Then, generously lubricate and install the O-ring(12) into the spring block, directly over the backup ring." Well here is where my troubles, unknown at the time, started. I "generously" lubricated this o-ring and installed it in the spring block. I completed the rest of the assembly,
I put the regulator on 165 PSI shop air and the IP was right at 120 PSI with no creep. So far so good. Put it on 500 PSI looked okay. Put it on 3000 PSI supply and adjusted to 135. Started purging. 135, 135, 80, 80. Changed gauges,no help. Turned off supply bled off pressure. Turned air back on, right to 135. Unfortunately as soon as I started purging it was all over the map from 80 to 160.
So it's not a high pressure leak, but something is causing inconsistencies. One thing I thought of is that the seat in the kit is different than the seat I removed and what is pictured in the parts diagram. See attached photo. The new seat has a shoulder on the back side that is not there on the original. I do not know how close the spring block gets to the seat but this could possible be an issue. Regardless, I needed to open up the reg as something was not right.
So, I took every thing apart and when i removed the seat I discovered my problem. There was a small mound of Tribolube on the seat. SO where did this come from? Remember the manuals note about "generously" lubricating the spring block o-ring? It appears that the Tribolube was pumped out of the spring block, up through he seat stem and onto the seat where it caused wildly inconsistent IP's.
So I put everything back together and it is now working as advertised. So be aware of the "generously" lubricating the spring block o-ring comment in the manual. I did not drown the o-ring in lube but most of what was there was pumped up to the face of the seat.
Hopefully this will keep someone else form making the same mistake.
John
