No the pt4 is back pressure and pt1 is inlet pressure.Pump outlet is ok idle is 0.58 bar and while purification its 0.25 bar (pt1). And pt4 is 1.9 to 2.0.
Pump filter is cleaned daily basis.But alrms low back pressure pt4 low coming before disharging.All water valves are ok .

Always getting pt4 low pressure alarm when comes discharge time ,just few mins before alrm coming low pt4.Have cleaned bowl, water block is ok no leak sv10, sv15 working fine.
Fuel density is 0.9744.
Many days has passed trying to rectify but no success.Please help with any suggestions.

Facing some issues s586 hfo purifier,low pt4 alarm , purifier cleaned with all new orings,no problems in discharging also.But its pt4 pressure keeps on fluctuating very fast from 0.5 to 1 bar aprox.its not stable which leads to low pt4 alarm after 2 -3hrs . Pt4 is 1.5bar , temperature 95 to 98. Oil ...

Facing some issues s586 hfo purifier,low pt4 alarm , purifier cleaned with all new orings,no problems in discharging also.But its pt4 pressure keeps on fluctuating very fast from 0.5 to 1 bar aprox.its not stable which leads to low pt4 alarm after 2 -3hrs . Pt4 is 1.5bar , temperature 95 to 98. Oil...

Facing same issues s586 hfo purifier,low pt4 but in every 5-6 hrs ,filter is clean, not too much sludge production also.only 800 hrs since last bowl overhauling.

Alfa laval S821 LO purifier was working fine until i done bowl cleaning job ,now iam getting "low bowl speed " alam every 1 hr.I already changed friction blocks(checked belt condition found ok) checked and clean rpm sensor , cleaned water valves.Major o/h done 8 months back. Any suggestion...

I have problem with tanabe air compressor(h74), there's come condensate water in sump daily.And now from auto drain trap continuous air flow when running.
Any thoughts will be highly appreciated

I have problem with tanabe air compressor, there's come condensate water in sump daily.And now from auto drain trap continuous air flow when running.
Any thoughts will be highly appreciated

Am getting low feedback pressure during ti59 alarm . when i start the purifier.did anyone face this problem.plz do share any idea.

Am facing a problem in hfo purifier alfa laval S851 : it runs fine for some time let say 20 hrs and after 20 hrs their starts coming oil spray from sludge portal when i check for any abnormal leak.And pt4 drops to 0.9 from 1.2 and flow rate 2.9m³/hr same.I renewed flow valve, piston , no return valv...

Yeah i notice that SV1 was not draining air properly thatswhy v1 not closing instantly.

I changed the solenoid valve small spring inside and coil .Now i think problem is solved for some time.

I have increased the set value of pr10 upto 3.6 (pt4). Am giving less pressure (air) as compared to required to V1 diaghram , so that air drain out quickly to put it in close position.becaause during ti70 pt4 should not rise too high to trigger alarm ( in my case this happens every day once. But i r...

Thanks popeye62 for your concern. This pt4 pr. High during ti70 alarm comes only when discharging initiate( not everytime only at every 12 to 24 hrs after).And alarm doesn't go it only goes after manual discharging again.I haven't touch pr11 parameter.And during ti70 pt4 suddenly becomes high to low...

Hello friends, am facing a problem of an alarm " High PT4 Pressure during Ti70 " .I have changed solenoid coil, spring along with small spindle screw .checked air pressure all ok .V1 valve operation is ok working fine.But i dont know why this alarm coming not regularly but comes after 12 t...