Drill Hole in Pump Check Valves
Drill Hole in Pump Check Valves
(OP)
I would like to survey you folks to see:
How common is the practise of drilling holes in pump check valves (e.g. to act as warm up line on a spare pump)?
I have had this discussion many times in house and there are good arguments for and against. I would like to know just how common is the practise. If you have any strong arguments (one way or the other) please let me know.
Thx Brian
How common is the practise of drilling holes in pump check valves (e.g. to act as warm up line on a spare pump)?
I have had this discussion many times in house and there are good arguments for and against. I would like to know just how common is the practise. If you have any strong arguments (one way or the other) please let me know.
Thx Brian





RE: Drill Hole in Pump Check Valves
The PVC intake line would thereby be pressure cycled, which is the largest single cause of PVC fitting failures industry wide.
Of course on other systems we manufacture we have either steel, stainless steel, or HDPE intake lines, which would not be damaged by pressure cycling.
PUMPDESIGNER
RE: Drill Hole in Pump Check Valves
*Does the check have a hole? (impossible to verify warm-up is on going or why if spare pump got plugged / cold).
*Is it to big (too much flow coming back through)?
*if pump block valve starts leaking thru, then check allows product back to pump and prevents maintenance activities.
Both work, just easier to know what you have and control with a RO. Best wishes.
RE: Drill Hole in Pump Check Valves
RE: Drill Hole in Pump Check Valves
at all times.
HTH
saludos.
a.
RE: Drill Hole in Pump Check Valves
If you have a pump that does require warm-up, I prefer the orifice arrangement mentioned above by stewbaby as opposed to drilling a hole in the check valve since the backflow can regulated much better. Also, if you are dealing with high pressures, a multi-stage orifice can be provided to prevent flashing.
Pumpdesigners' comments above show the importance of providing a relief valve on the suction side of a pump when the suction piping is not rated for the discharge pressure. Even check valves without holes drilled in them tend to leak a little.
Another case where I've seen holes drilled in check valves is in colder climates where if the pumps are not running you want all the water to drain out of the system back through the pumps and into a freeze protected receiver.
RE: Drill Hole in Pump Check Valves