How does this valve work?
How does this valve work?
(OP)
Hello all,
I am working on some PIDs given by a client. On these PIDs, I see some valves, and I can't understand how they work.
See attached picture.
The valve is equipped with an ON/OFF actuator, and there are two lines connected to this actuator.
It is installed on lines that can be used in the two directions, so I think small ball valves 1 and 2 are used depending on the flow direction.
I have no more information than the PID...
What I think is that the pressure in the pipe counter-balances a spring (in the actuator), and when pressure drops (or increases) the valve is forced closed.
If you've ever seen something like that, can you explain me how it works?
I am working on some PIDs given by a client. On these PIDs, I see some valves, and I can't understand how they work.
See attached picture.
The valve is equipped with an ON/OFF actuator, and there are two lines connected to this actuator.
It is installed on lines that can be used in the two directions, so I think small ball valves 1 and 2 are used depending on the flow direction.
I have no more information than the PID...
What I think is that the pressure in the pipe counter-balances a spring (in the actuator), and when pressure drops (or increases) the valve is forced closed.
If you've ever seen something like that, can you explain me how it works?





RE: How does this valve work?
how can I delete this post?
RE: How does this valve work?
I wanted to post this message in the other thread...
sorry people, i'm new to this forum, and not very comfy with the how to's...
RE: How does this valve work?
RE: How does this valve work?
RE: How does this valve work?
RE: How does this valve work?
I2I
RE: How does this valve work?
thanks for your answer
RE: How does this valve work?
RE: How does this valve work?
The valves are what I would call semi-manual. There is a box with two levers (open and close), admitting instrument air to the actuator.
The two 25mm lines are used to provide additionnal driving force (valve is DN600, so instrument air is not strong enough). Only the one at higher pressure (depending on the flow direction) is open when the valve needs to be actuated.
Thank you all for your answers.