Asked by Andy Blackwell Uncategorized
How can 7 kilogram air control the feed control valve of 140 kilogram pressure?
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What does the control center do in the negative feed back cycle?
That is very hi tech question! There should be no role of any control center in negative feed back mechanism. Both should regulate each other. But then the control center is required to do the up regulation or down regulation in this negative feed back mechanism. For example your blood pressure may get set at higher level in case of chronic psychological stress. Such stress is so common now a days.
Can you adjust the pressure on a hot water baseboard heating system?
Yes, add or remove water. Add to increase and remove to decrease. Use the autofeed valve to do this. Lifting the lever allows city water pressure into the system. Lowering the lever puts it back to its limiting setting. Most auto feed valves have a pin under the cap that can be adjusted by screwing in the top or unscrewing the top. This adjusts the preset pressure. Never go over 25 pounds or you will discharge the pressure relief valve.
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Asked in Lexus LS
Why is my 1996 Lexus ls 400 heater not working?
most likely cause is the heater control valve under the hood on the passengers side near the firewall. Look at the control valve and cable for a crusty dry residue leaking from valve onto cable. If there are signs of a leak the fluid tends to travel down the cable causing it to seize. Once this happens the servo bends the cable on the inside of vehicle. It is very easy to replace the valve and cable, but make sure you tape the cables together to help feed the new one through.
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Why does the cardiac muscle receive more blood flow during diastole?
When the muscle squeezes the heart pumps the aortic valve is open and blood is rushing into the aorta. When the valve closes due to the pressure being less than in the aorta the blood rushes back to the valve and that is where the openings tot he arteries that feed the heart muscle. Also as the heart relaxes, from the pump is when blood can flow through the arteries.
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Can a broken thermostat on an oil boiler cause hot water to flow out through the expansion pipe?
Yes, the water is getting too hot and is blowing out the pressure relief valve through the expansion tank. You should change this immediately. I don't agree: I am assuming that by expansion pipe, you are referring to the pipe connected to the pressure relief valve - A broken Thermostat won't cause the relief valve to activate. A broken thermostat will cause the boiler to either run or not run as desired. However, a broken (or incorrectly set) aquastat can cause the boiler to run too hot and cause the valve to activate, but if it is chronic, it could be a defective or dirty relief valve, defective expansion tank, a problem with the pressure reducing valve on the domestic feed or (as was my problem) an internal leak in my tankless coil. What is your boiler's pressure gauge reading and what does the Temp Gauge read on a call for heat (High Limit on and off)? Also, put a bucket under the pipe and carefully burp the relief valve to clear out any debris that might be causing the leak.
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Asked in Volvo 740
How do you replace a heater control valve on a 1990 Volvo 740?
1st, get new valve 2nd, clamp the feed pipes with screwdown pipe clamps (from your friendly halfords) or drain down the system (better) 3rd, undo jubilee clip on hose attached to valve passing thru bulkhead inside the engine bay and remove hose 4th, withdraw valve thru bulkhead and remove jubilee clip on internal hose refitting is reverse of removal good luck david