Q:When the pump is running with frequency conversion, the instantaneous power is greater than the power frequency operation, and the actual flow and lift are less than the power frequency. When running, the efficiency is very low. Why?

Variable frequency pump running normally, its flow and lift is lower than the power frequency operation, that is for sure. The so-called power frequency operation is full speed operation, of course, the head and flow is the highest.Frequency conversion is mainly to save power and reduce the running loss of equipment. The so-called efficiency, but also by the correct selection, the actual pump head and flow as close as possible, the actual working conditions for the best.

Q:HelloMy question is about a 2000 Nissan AltimaThe coolant in my radiator seems to be emptying out very often. When I re-fill the radiator and start the car, coolant slowly starts dripping from below the a/c compressor. I do not know if its the a/c compressor that is leaking or some other part there. Is there a possibility that the compressor itself is leaking coolant or could it be the water pump? I checked the hoses that go in and out of the compressor and there seems to be no leak. All I can see is coolant from the bottom of the compressor dripping at a rate of, say 1 drop per 2 seconds.Thank you

The A/C system is closed to any other engine fluids. The coolant is leaking from elsewhere.

Q:We've changed the hoses, and thermostat for the radiator. It still leaks coolant but we can't find out where it's leaking from.

Most likely your water pump is bad and leaking out of the weep hole on the pump, a water pump has a hole in it so when it goes bad water will start to leak water out of it.,The water pump is going to be on one end of the engine behind the timing belt cover , you wont be able to see it without pulling the cover. On most of these small cars the timing belt runs around the water pump.

Q:Earlier today I was driving and my car shut off at a stop sign. I got it to start again and it shut off at the next stop sign, so after a few minutes I got it to start again and immediately pulled over as there was a small amount of smoke coming from under my hood. The temp gauge didn't say it was overheating, but I think it mightve been stuck, because that had to be what happened. After sitting there for a while it started and stayed that way for a while, I let the engine run. I drove it to the gas station and put some coolant directly in the radiator and the resevoir, and almost all of it leaked right out. I started to drive it home and had to pull over about 6 times to let it cool down because it kept overheating( temp gauge showed it this time). I think its the water pump that is leaking, but I know very little about cars, and was wondering if it could be anything else? Also, the heater wasn't working in the car today at all.

If it's leaking from the water pump, you may as well do the timing belt, idle and tension pulleys too since they have to come off to do the pump. That pump is visible, you should be able to see the coolant dripping from under the belt drive pulley.

Q:i have a 97 mercury mountaineer and i recently got the thermostat changed in it. after doing so we noticed that the car was leaking antifreeze. we checked to make sure everything was tight and there was no cracks and my uncle said he thinks its the water pump how can i tell

since the leak only occurred after thermostat change ? it is reasonable to assume it is leaking around the thermostat housing. check this area first . ( did we fit a new gasket ? etc) water pumps have a small hole on underside that will weep ( leak) when seals are worn and pump needs changing. we can check pump is working by observing coolant flow. with a cold engine remove coolant filler cap.start engine and rev a few times to around 3000-35000 rpm observing ( may need an assistant) coolant flow into expansion chamber ( where you removed filler cap from) you should note coolant flowing across or into the expansion tank. if our pump has failed we would over heat !! check engine cooling when driving.

Q:Submersible pump coupling, what does this coupling mean?

Coupled with: "two people together in the cultivated land" means, in Chinese, that is, even things linked together meaningCoupling, as the name suggests, means the connection of the pump and the pipe.Submersible pump, used coupling or coupler, because the pipeline extends into the water, the water will not see, through the coupling, pump automatic clamping to the pipe end, simple and quick.

Q:toyota prius 2002 inverter water pump where is located and how to replace and buy

The manual pages JerryJ is referencing are HV-24 through HV-28. Essentially, you drain the coolant, remove the front bumper cover and the left head light assembly to expose the pump. It is held by two bolts and has one connector and two hoses. After replacement the coolant is refilled and the system must be burped. Those two nipples at the front of the inverter have to be used, but I haven't had success piping them back to the reservoir as the manual describes. I gravity feed them into a clean jar on the floor and recycle the fluid manually. When it is done you should see strong flow in the reservoir as you look in the top with the ignition on but not ready. The level usually drops after driving around the block - top it up and enjoy.

Q:I need to get my timing belt and water pump replaced, its been 100,000 km , just wondering, what exactly these things do, i want to know more about my car, and just how much this would cost to take care of, my dealership says almost a 1000, including labour, does this seem right.

Never get a dealership to work on your car unless you're not paying for it. Get a good garage to do it for you instead. If you're mechanically inclined you might be able to do it yourself, but im not sure how hard it is since it sounds like your timing belt powers your waterpump (just makes it more difficult, whereas my car has a separate belt that powers my WP). Otherwise you got a honda engine in there it sounds like, so it's not going to be insanely complicated.

Q:I have a pump connected to a lake, that I use to water garden. I changed the line into the lake as it had a air leak and lost it.'s prime.I have filled water back into the tank and lines .several times. And it hasn't caught it's prime. It is a year old pump that came with it's own tank.When I am doing all this I leave the tap end closed.I'm pretty sure that all is tight and not leaking.The line into the water is only about 5ft deep

Priming okorder / Hope it helps.

Q:What are the export pumps packed in cartons?

Our exports are packed in specially made export special wooden cases. The water pump bolts are fixed at the bottom of the wooden box through the anchor bolt hole, then wrapped in plastic bags, and then sealed.