Twin Plate Wafer Check Valves
Twin Plate Wafer Check Valves
(OP)
Hi,
I was hoping i could get some help on placing a twin plated wafer check valve on the end of a pump rated at 300m3/h. The pipe diameter is 200 mm, 8". I've tried to obtain as many data sheets with CV numbers etc,
I want to calculate the pressure head losses. The valve is ideally placed 5 to 10 diameters away from the discharge end of the pump but it will be a lot less than that.
Any alteratives would be great along with ideas.
Many Thanks
BML Engineer
I was hoping i could get some help on placing a twin plated wafer check valve on the end of a pump rated at 300m3/h. The pipe diameter is 200 mm, 8". I've tried to obtain as many data sheets with CV numbers etc,
I want to calculate the pressure head losses. The valve is ideally placed 5 to 10 diameters away from the discharge end of the pump but it will be a lot less than that.
Any alteratives would be great along with ideas.
Many Thanks
BML Engineer





RE: Twin Plate Wafer Check Valves
You are then at 83,5 l/s and at a speed of about 2,65 m/s, and yes, the valve will give you some presure loss, depending on actual form, but helped by the velocity that will keep the valve fully opened.
Please give a bit more information about your application, fluid and pressure conditions and pipeline layout? Exact make of valve - factory should be able to give you the loss directly!
Apart from this: if pressure loss, thigt closure and lifetime is an issue, and the fluid is clean (particle free) the obvious better choice would be a non-slam nozzle check-valve. Pump energy savings could be considerable.
RE: Twin Plate Wafer Check Valves
Gerhardl is right about the nozzle-check: the guidepost in the center will help promote durability. The center-hinged valves you described have a loose gap between the hinge pins and the plates. This gives them a very low initial cracking pressure but also accelerates wear if the flow is bouncy.
RE: Twin Plate Wafer Check Valves
The check-valves are soon to be in place. I know they are not ideal but i found ot that we had hattersly check valves, wafer pattern, on the end of some other high flow pumps. They worked perfectly, without problem.
i believe quality seats and material in the valves make a big difference.