A tilting disc check valve is a check valve where the disc has a pivot point at the center of the disc. It is also known as a tilt check valve or a tilting-disk check valve. When flow is moving forward, the valve easily opens and when there is flow reversal, the valve immediately closes.
Tilting disc check valves are generally used in agricultural applications but they may be used in other applications as well. The valves are used when there is frequent flow reversal.
The disc acts almost as n air foil so once it is fully open, the process easily holds it open. This is different than a swing check valve where the velocity of the process must be high enough to keep the check valve open.
The tilting disc is much lighter and smaller than the disc in a swing check valve. Additionally, the center of gravity for the disc is very close to its pivot point. This means that the cracking pressure is much lower. The tilting disc check valve has much lower pressure drop at low flows than the swing check valve. However, at higher flow rates, the tilting disc has a higher pressure drop than the swing check valve.
The minimum velocity required for holding a tilting check valve wide open can be determined by the empirical formula:
\(V=j \sqrt{v}\)
where:
\(V\) = Liquid Flow, ft/s (m/s)
\(v\) = Specific Volume of the Liquid, ft3/lb (m3/N)
\(j\) = 305.5 (80) for a 5E Disc Angle (typical for steel)
= 114.6 (30) for a 15E Disc Angle (typical for iron)
Tilting Disk Check Valve Design Considerations
Tilting Disk Check Valve Datasheets |
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Tilted Disk Datasheet | |
ANSI 125 | Check, Tilted Disk, ANSI Class 125/250/150, CI DI (in) |
ANSI 150 | Check, Tilted Disk, ANSI Class 125/250/150, CI DI (in) |
ANSI 250 | Check, Tilted Disk, ANSI Class 125/250/150, CI DI (in) |