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Valve explanation

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garciaf,
Please back the camera up a little so we get more of an overall shot.



Sometimes its possible to do all the right things and still get bad results
 
Garciaf,That Valves appears to be a High Pressure Trunnion Ball valve (
"A"- This may be for lubrication of the Trunnion(Stem)
"B"- This may be for lubrication of the upstream and downstream Seals

Sometimes its possible to do all the right things and still get bad results
 
I agree that "B" connections are injection points for lubrication of the seals, but "A" appears to be a bleed valve for typically checking seat tightness in a double block and bleed valve. The exhaust port is clearly visible.
Cheers,
John
 
I agree with JhonGP A = Bleed valve, and B = injection port.
 
IMHO, A is a body vent - that's why it has a hole in side of it. Just be careful if you use it - sometimes these screw in to release gas and out to seal - caught me out once as we were gassing up - a fitter had gone through and what he thought has checked tightness of vents and the thing leaked like sieve as soon as we put gas into it!

B I think are the lines to inject sealant onto the seal face.

find the sectional drawing and all will be revealed.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
Yes "A" is a body bleed. Often there is a recessed Allen screw where the small bolt is, but it does the same thing, loosen the small bolt and a stem comes off a seat and bleeds the valve body through the hole on the big nut. There is also a bump on the big nut (you can see it in the picture on the top face of the nut) to let someone know that it is a bad idea to put a wrench on that part. I've never had the big nut loosen when I operated the bleed valve, but I suppose it could happen.

"B" are seal fluid injection ports, not trunnion bearing lubricant (the trunnion bearings are in line with the actuator).

[bold]David Simpson, PE[/bold]
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
 
those are bleed valves . in some valve manufacturer, they weld this bleed valve are prior to deployment to permanent subsea use.
 
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