Custom poppet valve redesign help needed
Custom poppet valve redesign help needed
(OP)
I have a spring loaded adjustable differential poppet valve that is too small, and the vendor does not make a larger one.
It is a special configuration that places the poppet port at the outlet barrel tip. The valve body has an extended barrel to extend the port down to the bottom of the threaded mount to match up with the inner wall of a cavity.
I need a redesign to maintain the functionality of the valve while enlarging the orifice to pass 50% greater flow. Pushing the flow rate causes erosion. Referrals to firms capable of the redesign would be appreciated.
It is a special configuration that places the poppet port at the outlet barrel tip. The valve body has an extended barrel to extend the port down to the bottom of the threaded mount to match up with the inner wall of a cavity.
I need a redesign to maintain the functionality of the valve while enlarging the orifice to pass 50% greater flow. Pushing the flow rate causes erosion. Referrals to firms capable of the redesign would be appreciated.





RE: Custom poppet valve redesign help needed
RE: Custom poppet valve redesign help needed
RE: Custom poppet valve redesign help needed
I actually have two feed systems which feed the cavity. The smaller flow has even wear over a 2-3 yrear period. The 3x larger flow fails every 2-3 months. And I would like to operate both valves at 50% greater rate, while extending the repair frequency for the problem valve out to once per year.
Feed A Feed B
Vol flow, gph actual 12.0 36.7
Vol flow, gph desired 16.7 51.6
Op temp, C 50 120
Max dp avail pr, psi 325 325
Density lb/gal 12.55 11.35
Visc, cP 14 7
RE: Custom poppet valve redesign help needed
RE: Custom poppet valve redesign help needed
When you saw problems was part A made from 316 or Hast C?
If part A was made from Hast C are your process fluids oxidizing or reducing?
People will stay from Hast C due to machining difficulty.
RE: Custom poppet valve redesign help needed
RE: Custom poppet valve redesign help needed
RE: Custom poppet valve redesign help needed
If not what is the composition of the stream being injected?
Your arrangement appears to be setup to insure that the material being injected into the process stream is a higher pressure than the process stream. This is to prevent backflow of the process stream.
RE: Custom poppet valve redesign help needed
The inlet side is kept higher to prevent backflow. The pressure is set ~ 100 psi above the outlet. The feed systems both have pressure oscillation. Feed pumps are simplex diaphragm type w/ pulsation dampener, which is not perfect.
I was told that the primary function of this quill is to prevent backflow. Is this consistant with the design?
When the valve wears, oscillations become greater in amplitude, plugging becomes more likely and instantaneous flow more variable.
RE: Custom poppet valve redesign help needed
Where are you seeing the erosion?
Normally a valve to accomplish this isn't nearly as complicate as your valve. An injection quill will a small chamber over a spring loaded ball check valve to prevent backflow.
Here are what would be called standard injection quills. There are numerous variations on this arrangement.
http://www.koflo.com/injection.html
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RE: Custom poppet valve redesign help needed
Wear seems to be from a glancing blow on the exit edge of the orifice, thining a point on the oulet side of the orifice first. As that point wears, a worn shiny spot develops on the outlet face of the tip (the side facing the cavity). The inside does not show a shiny spot, just the eventual enlarged asymetric oblong opening.
Would the vibration effect result in the tip of the stem being damaged? The stem tip is rarely damaged.