Question about Watts Regulator Temperature and Pressure Relief Valve 40XL-4, 1"

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My pressure relief valve on my boiler is allowing water to pass through constantly.how do i adjust it to stop the water flow? only have about 15 pounds of pressure in system

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Even a small amount of crud on the rubber washer/sealer can cause the valve to seep. Some valves can be taken apart and cleaned but it will be better to replace the valve. They can be found on line for around $12 or more. You will have to shut off the water in take valve and drain most of the system unless you have a main line shut off valve so the system wont drain back into the boiler. These valves are usually set at 30PSI.

Posted on Oct 16, 2013

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Posted on Jan 02, 2017

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Hi, it appears you have a defected relief valve. you can try one solution. lift the handle on the relief valve and let some water out. sometimes that can flush out materials thats blocking the stem in the valve. if it's still leaking it must be replace.

If this doesn’t work for you please write back. Thanks,

Posted on Nov 23, 2008

  • 686 Answers

SOURCE: Relief valve constantly releasing water.

lower your thermostats a bit. If your temperature is set to the hottest setting, then chances are no relief valve will do

Posted on Jan 08, 2009

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1 Answer

Can you put a 3/4 pressure relief valve on a water boiler that has a 1 inch valve on it with the same 50 psi


pressure is one of the variables - other is maximum flow, in case of pressure relief valve (safety valve) if valve was calculated at 50psi and flow of say 10gallon/sec, if you change the diameter, your flow will drop significantly, in case of 1" drop to 3/4" drop will be by nearly 45%! and that is significant drop...

i would suggest do not use reducer but 1" relief valve as required...

if you wan to establish bit more calculations on the subject, go to this site and have play with variations, sele3ct correct calculator and enjoy :
http://www.tlv.com/global/TI/calculator/

reverse engineering will be here:
https://www.physicsforums.com/threads/calculate-water-pressure-coming-out-of-a-pipe.274737/

hope this will help you a bit - do not forget to vote...

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Ravenheat 80/20 boiler. the boiler looses water pressure but only when working in central heating mode. Boiler holds pressure indefinitely if central heating is not used,hot water can be drawn without a...


Hi, your boilers pressure should be holding 1.5 bar with the relief set about 3. If the pressure is below this the flow switch will cause the boiler to stop as theirs not enough pressure to operate. Another thing, does your boiler have an auto fill system or do you need to plug a hose in to fill it? If its an auto fill system and you lose pressure you could have a leak.

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The water is out flow.After the system runs. It is keep dripping a while then stop. It can be filled up that bucket a day


The water heater is equipped with safety device called a pressure relief valve. This valve is designed to open automatically when water pressure inside the tank becomes too great.

The relief valve should have a lever on the top. Lift it / push down on it briefly and it will allow water in the tank to flow through it (and out the pipe into the bucket). By allowing water to flow, will clear any debris caught between the seat and seal that may be causing the leak. If the valve continues to leak after doing this, the valve should be replaced. In most areas, this type of work is required to be performed by a licensed / qualified plumber.

Good luck!

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Wickes 102 combi boiler constantly loosing water pressure


It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

"
this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

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Overflow pipe flowing


Check temperature off the water for proper functioning thermostat. Look at set points on heater's thermostat. It's made to let water out when water get's to a certain high temp. More than likely it will be the pressure relief valve going bad and not holding.

T&P releif valve can be replaced on heater. Turn water off and remove with a pipe wrench. It will come out and any hardware store will carry it. T & P pressure relief valve is 3/4 threads.

When installing new one use teflon tape on threads.

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1 Answer

Worcester 350 boiler pressure low - warning light comes on so i top it up with water half an hour later the pressure drops again. Have checked rads and pipes no obvious leaks. Water seems to be coming out...


That overflow is the Pressure Relief Valve.usually they are set at 3-3.5 bar but over time they can be gunged up inside and leak/allow water to flow out. Dismantle & clean or replace. Turn off mains water and ch pipes before removing - operate valve remove & allow for some water to leak from it

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1 Answer

I have a Glowworm 30 cxi and the light is flashing, the pressure is 0.4.... i have no water or heating...help please


Under the boiler a little right of center there is a blue/other colour knob. Turn this anticlockwise [as you look up] [twist from right to left] This is the mains inlet tap to let water into the boiler and create the pressure shown on the guage 0.5 bar is the absolute nin.
allow the water to flow in until the guage reads about 1 bar then turn off the knob -not too tight as these are plastic
If you allow too much pressure- do not worry, there is an automatic relief valve.
If the boiler persists in loosing pressure, look for a leak in all pipes to & from radiators. If no leak then check the pressure relief valve outlet pipe, it usually goes through the wall to the outside. Look at the end for water drips & if there are drips replace valve

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Water logged expansion tank ( ruptured diaphram in tank) or wrong size tank. This caused the excessive pressure in the system causing the relief valve to open. Also, air in the system causing flow to stop, Both conditions will cause boiler go out on safety.

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Hi, it appears you have a defected relief valve. you can try one solution. lift the handle on the relief valve and let some water out. sometimes that can flush out materials thats blocking the stem in the valve. if it's still leaking it must be replace.

If this doesn’t work for you please write back. Thanks,

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