double disc swing check valve

double disc swing check valve

The double disc swing check valve is an improved version of the single disc swing check valve. Or it can be explained that the single disc is split in two. By splitting the disc in two, the mass of the single disc is greatly reduced. Subsequently, the travel distance from open to shut off position has been greatly reduced. As a result, the efficiency can be improved to some extent.

The double disc swing check valve is used to affect well at allowing forward flow and preventing the reverse flow. Similarly, the characteristic of shut off is still the important feature of the double disc swing check valve. And it should be mentioned that the shut off of the double disc swing check valve has greatly minimized the slam potential as compared to that of the single disc swing check valve.

In double disc swing check valves, the hinge pin is stationary and each disc swings freely when opening or closing. Multiple springs are used on larger sizes to compensate for heavier discs and to improve shut off speed. And typical double disc valve with torsion spring which accelerates closing speed to minimize reverse flow and slamming. Therefore, further improvement results with torsion spring forcing the double discs to shut off with minimal flow reversal.