Automatic Draining of Pipe above a Check Valve
Automatic Draining of Pipe above a Check Valve
(OP)
Does anyone know of a relief valve that has the ability to drain the portion of pipe above the check valve?
I have a client who wishes to do this. His idea is when the check valve closes, a smaller separate valve will open (automatically) and release the water contained in the pipeline above. An AV release is already placed in the system.
I spec'd a 2" bronze ball valve on a tee above the check valve that would enable manual draining of the line. My client wishes to this automatically, but i can't see how an automatic relief valve can distinguish between a line flowing under pressure and a line containing a static volume of water.
Thanks
Brian
I have a client who wishes to do this. His idea is when the check valve closes, a smaller separate valve will open (automatically) and release the water contained in the pipeline above. An AV release is already placed in the system.
I spec'd a 2" bronze ball valve on a tee above the check valve that would enable manual draining of the line. My client wishes to this automatically, but i can't see how an automatic relief valve can distinguish between a line flowing under pressure and a line containing a static volume of water.
Thanks
Brian





RE: Automatic Draining of Pipe above a Check Valve
RE: Automatic Draining of Pipe above a Check Valve
One of these companies is Cla-val. They make an valve with an unloading function. They have a few valve arrangement that you can use, depending on your application. A few examples:
The Model 93-01/693-01 can be installed in a distribution line where there is a need to close the unloading valve on the starting of a pump. The solenoid control is activated on pump start-up and closes the valve.
The Model 136-AU Battery-Operated Programmable Control Valve is ideal for automating distribution system flushing applications. Model 136-AU applications requiring remote, stand alone valve opening and closing on a predetermined schedule include night-time tank filling, service line limiting time of use, automatic line strainer flushing, etc.
I am not sure of the exact details of what you you are trying to accomplish. But Cal-val has the equipment that you need. Give them a call for specific details.
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RE: Automatic Draining of Pipe above a Check Valve
BTW, we are moving fresh water from streams to impoundments for shale gas development and will have some sections buried and other above ground. Sections above ground are going to be drained in the winter, but the client wishes to do this automatically. These valves will most likes be exposed to extreme temperatures for extended periods of time, so I'm looking for something fool-proof (if there is such a thing).
Brian
RE: Automatic Draining of Pipe above a Check Valve
You may need to blow the lines out as well. I doubt all of the fluid will drain by gravity.
RE: Automatic Draining of Pipe above a Check Valve
Put a solenoid on the drain valve with a temperature control. When the temp gets to zero F, open.
We will design everything from now on using only S.I. units ... except for the pipe diameter. Unk. British engineer
RE: Automatic Draining of Pipe above a Check Valve
Steve
RE: Automatic Draining of Pipe above a Check Valve
Using a solenoid valve with temp. sensing means extra wiring and instrumentation.
Drilling a hole in the CV as proposed by SteveWag is even more simpler solution provided a simple conventional type CV is used. But not on those proposed by bimr.
RE: Automatic Draining of Pipe above a Check Valve
Steve
RE: Automatic Draining of Pipe above a Check Valve
Where are you working PA? We have marcellus work in Susuqehanna and Clearfield counties right now.
Brian
RE: Automatic Draining of Pipe above a Check Valve
Steve
RE: Automatic Draining of Pipe above a Check Valve
As to sizing, I have a table that I found years ago (see link). It's an AWWA "Leak Loss" table showing loss (flow) at various diameters and pressures. If your pumping 4-500 GPM at 100 PSI, then a 3/16-inch hole "leaks" about 8 GPM, or about2% of the flow.
Steve
RE: Automatic Draining of Pipe above a Check Valve
Since these connections are sometimes above grade, the piping between the check valve and the connection needs to be drained.
Not sure if this is what you want, but you can look on www.vikinggroupinc.com/en/technical/233/241 for information.