Question about Hamat 3-3942PC Deco V Kitchen Faucet with Metal Side Spray Polished Chrome...

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Low water pressure in both cold and hot water. Plenty of pressure at supply but not at faucet. As a matter of fact, if I turn on the hot water and then the cold water at the same time the flow does not increase. If I disconnect the cold water at the supply line and turn on the hot water, I get plenty of pressure back through the cold water line.

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  • jimimac169 Nov 16, 2009

    I have checked for twists, and can't find any. I do wonder about the presssure reducer, but don't know where to look for it.The fact that the watrer flowing directly through the hose i.e hot water into the faucet and back through the cold water hose, flows normally, makes me believe that something inside the faucet is causing the problem. Is there a way to remove the effect of a reducer?



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You are most likely being severely limited by the bore of the internal pipes in the faucet which are a lot smaller than the supply pipes and effectively act as a pressure and flow reducer.make sure that any flat washers you are using are not causing the flow restriction - I have seen this in many new faucets where the hole in the flat washer is far too small. Also check that the faucet is not fitted with pressure reducers - as again I have seen this in many new faucets on the market. Also try removing the spout end - which may be an aerator fitting to see if the flow improves. Aerators will simply block more of the flow. Other than that make sure that if you are using flexi pipe tails to connect to the faucet that they are not twisted or creased or mis shapen and thatth internal rubber tubes have not collapsed.

Posted on Nov 14, 2009

  • Karl Wright
    Karl Wright Nov 16, 2009

    Having checked over the tap diagrams and parts the only things that will definitely cause a pressure restriction are the flexible feeder tubes & tails and the aerator and screen. The actual flow capacity of the 10mm tube will be 0.44 times that of the main supply line on both hot and cold supplies. The head work assemblies should not cause any additional restrictions but check the sizes of the holes in the head wells to make sure they are not obstructed or have any burring on them. Also check the state of the washers. Assuming that you have isolation valves in the supply lines of both hot and cold supplies you could remove the tap head assemblies for both hot and cold and turn on the isolators to see if they era causing any flow restrictions and make sure that the diverter is the correct way up with the smaller side pointing down. The replace the head assemblies any try the taps again and this time remove the aerator and screen. Otherwise you are simply down to the tap either being defective or simply not being up to the job or the inlet pressures not being high enough. Test your water supply lines for flow rate – how long does it take for each line to fill 2 litres or half gallon in a bucket or measure? Then connect the tails and try the same. Then do the same with the faucet connected to the tails. If you see large differences between the results of the tails and the faucet then you could be seeing design or manufacturing fault with the faucet.

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