ball valve seat and ball damage
ball valve seat and ball damage
(OP)
dears ,
we have one problem at one site , we are using ball valves DN80 , the contractor sent us back a report mention that most of the seats and balls are damaged !! the factory said that all valves are tested 100% before delivery , so what is the reason behind that ?
Ahmad
we have one problem at one site , we are using ball valves DN80 , the contractor sent us back a report mention that most of the seats and balls are damaged !! the factory said that all valves are tested 100% before delivery , so what is the reason behind that ?
Ahmad





RE: ball valve seat and ball damage
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RE: ball valve seat and ball damage
What sort of "damage"?
How were they stored and transported?
Did you have any independent inspectors / testing done before delivery?
Could have been fine when they left the factory, but your contractor just flung them on the dirt and then operated them a few time with sand / dirt / grit inside and hey presto - damaged valves.
If you as client or engineer doesn't have your own eyes on the ground then you are blind.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: ball valve seat and ball damage
Actually am a distributor and we purchase the valves from one factory and delivered to the site , all valves are inspected and we are sure about that, the damage of the seat is clear , attached some pictures
do you think water hummer happened in the operation and damage the material ?
Ahmad
RE: ball valve seat and ball damage
Your initial post implied that these were brand new and not in operation.
Those pictures are used valves.
what exactly are we looking at - could do with a sectional view. What is the ball in view as it doesn't seem to be sitting on the seat?
If that is a seat then looks to me like someone has opened it under a very high differential pressure or been using it as a throttling valve.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: ball valve seat and ball damage
Ahmad
RE: ball valve seat and ball damage
currently I have no idea how any dmage could occur, but please also advise
Age of valve,
Type of valve ( two part, three part, what?
Floating or trunnion mounted
Pressure rating of valve
Fluid
where is leak - through the valve seats or out of the valve body?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: ball valve seat and ball damage
RE: ball valve seat and ball damage
its new valve , we can say 7 months
what do you mean by 2 part or 3 parts ? its ball valve
PN16
fluid : water , application : used in tanker filling station for the drinking purpose.
what is the difference between Floating and trunnion ?
the leake from the seats
AHMAD