Check Valve

[JK_Boston_Catalina310]

JK, I always assumed that Catalina put the check valve in the bilge pump circuit because it shares the outlet with the manual diaphragm pump. Without the check valve, the manual pump would be pumping water back into the bilge through the Rule pump. Does this make sense?
BTW, I did install a high water alarm for those times when the check valve gets stuck.

Could be but I would think there is more potential to have the automatic back flow through the manual. I am going to look at that soon.

 

[waternwaves]

"Check valves have absolutely no negative affect on the bilge pump. (FALSE if you are referring to flow rate) Pumping water is based on head which is the total vertical rise you are pumping the water. (THESE ARE NOT POSITIVE DISPLACEMENT PUMPS. FLOW DECREASES AS THE LINE GETS LONGER OR OTHER LOSSES ARE PRESENT e.g. check valves) The head is the same weather you have a check valve or not. ("the "HEAD" means nothing here. Hydraulic HEAD is one thing, HEAD loss is another." Failure to use accurate wording has resulted in a silly argument."

It takes more than wikipedia to get mulitple accredited engineering degrees.

"Head loss"
In any real moving fluid, energy is dissipated due to friction. Turbulence dissipates even more energy for high Reynolds number flows. Head loss is divided into two main categories, "major losses" associated with energy loss per length of pipe, and "minor losses" associated with bends, fittings, valves, etc.


understanding the difference between hydraulic "head"

and "head loss" will help avoid confusion.

one sentance does not do justice to describe the differences.

 

[ttac]

"Check valves have absolutely no negative affect on the bilge pump. (FALSE if you are referring to flow rate) Pumping water is based on head which is the total vertical rise you are pumping the water. (THESE ARE NOT POSITIVE DISPLACEMENT PUMPS. FLOW DECREASES AS THE LINE GETS LONGER OR OTHER LOSSES ARE PRESENT e.g. check valves) The head is the same weather you have a check valve or not. ("the "HEAD" means nothing here. Hydraulic HEAD is one thing, HEAD loss is another." Failure to use accurate wording has resulted in a silly argument."

It takes more than wikipedia to get mulitple accredited engineering degrees.

"Head loss"
In any real moving fluid, energy is dissipated due to friction. Turbulence dissipates even more energy for high Reynolds number flows. Head loss is divided into two main categories, "major losses" associated with energy loss per length of pipe, and "minor losses" associated with bends, fittings, valves, etc.

understanding the difference between hydraulic "head"

and "head loss" will help avoid confusion.

one sentance does not do justice to describe the differences.

I just want to add to this that our shower sump has a check valve in it and at times it will NOT overcome the head pressure that is on the other side of the check valve. I will find the pump running and the sump overflowing in to the bilge!! With this problem I won't put in a check valve in my bilge pump line!

 

[SV Escapade]

I have a 2009 49, on my electric blige pump discharge there is a one way valve is this a factory install or did the previous owner put it on.

Escapade is a 2008 41DS. Hunter installed a Johnson Controls primary bilge pump. It has an internal check valve.