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Author:
lakegeorge (PA)
folks I have vacation home that in off the main street below stree level..i have a sewer holding tank that pumps up to the city line when necessary. the configuration of the system is a sewer pump with a ball check installed directly on the pump. the line goes up about 5 ft and has a weep hole drilled into it. the line then elbows horizonatal thru a globe valve, exits the tank and the proceeds up to the city line at a slope that is probably about 8 feet higher..approximately...the my pipe goes into a manhole in the street and enters a foot or two above the floor of manhole so no chance of anything coming back into pipe.
here is my question, when the pump stops, the water drains back from the pipe (sloped pipe) back into the sewer tank..is it unreasonable to install another check valve outside the tank to keep all this water from re-entering the tank or is this not a good idea..
help...
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Author:
hj (AZ)
Whoever installed the pump was NOT knowledgable about it. The hole in the pipe MUST be BELOW the check valve not ABOVE it. Not doing it that way is why ALL the water in the pipe drains back into the pit. RELOCATE the check valve, because where it is NEGATES why the hole is in the pipe in the first place, (and it must be there).
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Author:
lakegeorge (PA)
the check valve is built right onto the pump.. its a hydro...pump..no place to put a hole
could I put another check valve in the horizontal part of the line leaving the sewer tank to alleviate the water draining back
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Author:
packy (MA)
that won't hurt anything..
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Author:
hj (AZ)
deleted duplicate
Edited 1 times.
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Author:
hj (AZ)
NEVER heard of a pump like that, but if so, then put another valve in the line.
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Author:
lakegeorge (PA)
hydromatic sewer pump....it has a ball check installed..it mounts to a railed mounting system so you pull the pump straight up on the rail and leaves the pipe etc atatached to the bottom
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Author:
packy (MA)
can you drill the hole below the check valve?
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Author:
bernabeu (SC)
packy,
not necessary
a 'hydromatic' does not require the drilled hole as the check is ON the pump itself
OP,
shoot the @#$%& that drilled the hole
from Pentair Installation Manual (note the LACK of relief hole requirement):
Pump Installation
Installing Pump in Sump: Before installing pump in sump, lay it on side and turn impeller with fingers. Impeller may be slightly stuck due to factory test water so it must be broken loose with small bar or screwdriver in edge of vanes. The impeller should turn freely. Clean all trash and sticks from sump and connect pump to piping. A check valve must be installed on each pump. A gate or plug valve in each pump discharge line is also recommended. This valve should be installed on the discharge side of the check valve so if necessary to service the check valve, the line pressure can be cut off. Single pump systems are sometimes installed without a check valve where it is desirable to self-drain the discharge line to prevent freezing. This can be done only with short discharge lines. Otherwise water will return to the sump and cause short cycling of the pump.
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
Edited 3 times.
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Author:
hj (AZ)
The "hole" has NOTHING to do with the check valve. It is to aspirate the air from the volute if the pump does not shut off and sucks air. If that happens the pump is air bound and cannot pull water to pump normally. The hole allows water to flow into the pump and displace the air so the pump can operate normally. The water could NOT create enough pressure to push the air through the check valve, especially with a head of water BELOW the drilled hole.
Edited 1 times.
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