Flow that runs backward down a line can upset the process or damage equipment. A non return valve lets the flow pass one way and stops it going back.
It opens to the forward flow and closes against any backward flow, so the liquid can only go the right way.
This guide explains what a non return valve does, where it fits, and how to keep it reliable.
What Non Return Valve Do
A non return valve opens when the flow goes the right way and closes when the flow tries to reverse.
So liquid passes forward freely but cannot run back down the line.
That one way action protects the process and equipment from backflow.
Where They Fit in the Plant
Lines where backflow would upset the process or damage a pump suit a non return valve.
Wherever the flow must only go one way, the valve enforces it.
By stopping backflow, the valve protects the line and the equipment on it.
Signs the Valve Needs Attention
A valve in trouble shows up in the flow and the seal.
- The valve passing when it should be shut
- The flow not controlled as it should be
- Leaks at the seat or the stem
- Wear on the seat from the liquid
- The valve hard to open or close
What Makes a Good Valve?
A valve is judged by a tight seal and reliable control.
A Clean One Way Action
The valve must open forward and close against backflow cleanly. A clean one way action is the point of the valve.
A Tight Close on Reverse
The valve must close tight when the flow reverses. A tight close stops the backflow.
Keeping the Valve Working
Routine attention keeps the valve controlling your flow.
- Watch that the valve seals tight when shut
- Watch that it controls the flow well
- Check the seat and stem for leaks and wear
- Keep the valve free to open and close
Common Questions About Non Return Valve
A non return valve lets the flow pass one way and closes to stop it flowing back, so the process is protected from backflow that would upset it.
Lines where backflow would upset the process or damage a pump suit a non return valve.
A valve that does not seal tight passes flow when it should be shut, which loses control of the process and wastes what it should hold back.
Watching that it seals tight and controls the flow, checking the seat and stem for leaks and wear, and keeping it free to move keep the valve working.
Control the Flow Reliably
A non return valvgives tight, reliable control of the flow where the plant needs it. A tight seal and reliable control are what make it dependable.
If backflow could upset your line, a non return valve stops it. Explore our valves and castings for the right one.
If backflow could upset your line, a non return valve stops it. See our valves and castings for the right fit.
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