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diaphragm
In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system.
Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris.
See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm.
I am having problems with the hot water upstairs on a valiant Combi boiler, its about 10 odd years old, the last work on it was a replacement diaphragm i believe a year ago . The hot water downstairs is fine but upstairs shower has no hot water and the bathroom sink taps run infrequently luke...
haquea
Thread
boiler
combi
combi boiler
diaphragm
hot
hot water
no hot water
oil
shower
upstairs
valiant
water
Changed one yesterday. Now I don't think I am the best gas man in the world by a long shot, I am still relatively new to the game. But I have never worked on a boiler that is such a pain in the backside!
I spent 3 hours 45 mins doing it. Worked after like, but christ! I tried just un-screwing...
I have a vented unzoned central heating system in my small 3 bedroom house.
I have just built a granny flat out back (nearly the same size) and have run pipes and wiring from both buildings to a boiler house.
I want to relocate the boiler (or install a new condensing boiler) in the boiler...
We have a old high level toilet and everytime you goto flush the toilet their is no resistance and the toilet don't flush very well, so i removed the syphon and noticed that the diaphragm is split in 3 places, so i took the diaphragm to plumb centre and they just looked at me stupid as they have...
Hi
Have just discovered a drip from my main 30 he boiler and had a look and it is slowly seeping from the opening on the diverter valve housing where the pushrod comes out to contact the sensor.
I assume this means the diaphragm is punctured etc?
any ideas how much to have it replaced?
many...
Keith Davis
Thread
around
boiler
combi
diaphragm
diverter
diverter valve
leaking
main
possible
valve
where
Hi guys,
I have taken apart my diverter valve and found that the diaphragm was completely shot hence the reason I have no hot water,
Having got a new kit vaillant diaphragm kit 01-0365
I am not sure what goes where...I got new screws etc...but where does the small white disc go ( near the...
Hi I don't know if you can help me. I've looked at numerous videos but none of them seem to match my symptom.
The toilet wonte flush basically because the valve wonte open. when you pull the handle the metal hook pulls a kind of sall plunger all the way up to the top of a small tube but it...
We have a Baxi 105e. central heating working fine, pre heat working, but not getting hot water
Had plumber round 4 times now. 1st time he said it was plate heat exchanger choked
Replaced that , no different. 2nd,3rd4th time don,t know what he did but hot water worked for a few mins but soon as...
Robert Fowler
Thread
baxi
boiler
central heating system
diaphragm
instant
water
Hi first post here, I have removed a dudley pneumatic siphon as it was not working , Upon inspection the white cup shaped holder which houses the bladder is broken at the hook on top which allows the plunger to pivot. ( this is the part you need to remove to replace the diaphragm ).
My question...
Hello, I am a not so proud owner of an ocean alpha 280e which powers 12 radiators (some double panel) and a power shower. Two towel rails have just had valves replaced and prior to their repair the boiler was providing plenty of hot water with no issues. Since the repairs we often have to run...
Hi i have gat a baxi 105he . There is hot water to all taps in the house apart from the kitchen tap with is cold . i did manage to bring the boiler on once with the tap open fully. But it used to work with tap half open... Any ideas
carl c
Thread
105he
baxi
diaphragm
hot
hot water
mixer
no hot water
tap
water
WHAT IS THE CORRECT WAY TO FIT A DIAPHRAGM TO THE DIF VALVE ON BAXI SYSTEM or POTTERTON SYSTEM ,IS IT WITH THE SMALL BUMPS FACING OUT OR IN. ALSO WHEN THE PIN DOES NOT MAKE IT FAR ENOUGH TO MAKE THE SWITCH EVEN AFTER CLEANING WHAT WOULD CAUSE THIS ?
Hi, im looking for some advice in relation to my boiler!! Weve been in our current home for 5 years. The house had a brand new boiler fitted and wd have never had any issues until recently. A few weeks ago we noticed the temp of our baths was getting cooler, to the point where the majority of...
Dan7146
Thread
basin
being
boiler
central heating system
cheap
cold
cold water
diaphragm
fix
flow
hot
hot water
lukewarm
oil
pilot light
pressure
problem
shower
tap
water
My boiler isnt giving out any hot water
I can see that the the little plunger that closes the microswitch isnt moving so i can assume that the diaphragm needs replacing?
The problem i have is if i close the microswitch myself which then turns the hot water light on the display and flames...
maxumo
Thread
baxi
boiler
cheap
diaphragm
diverter
diverter valve
fix
hot
hot water
microswitch
no hot water
problem
safe
safety
taps
valve
water
Hi,
The problem we have with boiler is intermittant fault with heating ,
the boiler is firing on and off every 20 secs or so.
The hot water is fine, boiler comes on and stays on when taps demand.
The main board and ignition board have been replaced recently in the last yr or so also diaphragm in...
izhammer
Thread
boiler
bosch
central heating system
diaphragm
diverter
diverter valve
fault
hot
hot water
ignition
problem
taps
valve
water
worcester
worcester bosch
this happens on and off, sometimes it works fine and others it doesnt.
what it is thats happening is that the heating is working fine, but sometimes the hot water isn't. I noticed that with the tap running, the burners weren't firing up. I think it may be the domestic diaphragm that may need...
air
boiler
boilers
central heating system
combi
diaphragm
excel
fault
gas
hose
hot
hot water
manuals
pressure
problem
problems
qualification
switch
tap
trade
vokera
water
I have a chaffoteaux corvec britony 2A water heater.
The pilot light is lit, but when the hot tap at the sink is turned on there is no hot water.
The water pressure is low, and the burner will not fire up.
I have checked the water govener and the diaphragm, everyone seems to say change the...
chaffoteaux
Thread
burner
diaphragm
gas
heater
hot
hot water
no hot water
pilot light
pressure
problem
sink
tap
valve
water
water heater
water pressure
Hi chaps, went to a old alpha ocean 240p with the problem of very little hot water(barely luke warm) and beleived it was a problem with the plate heat exchanger as both the micro switches on the divertor manifold were operating fine but the problem still exists!
Now i'm wondering wether to...
Boiler has been on hot water only for the summer, when switched over to heating and hot water, can't get any heating. Boiler lights, gets hot, and cuts out after 15 -20 seconds or so. Heat exchanger pipe to diverter valve is red hot. Heating outlet pipe out of the boiler to rads and return...
Ralphy3
Thread
bar
baxi
boiler
central
central heating system
circulation
cold
combi
diaphragm
diverter valve
eco
flow
hot
hot water
no central heating
oil
pipe
pressurised
pump
radiator
system
tap
valve
water
Hi, I have a baxi 80he plus and the timer stopped working one day.. have replaced this with a new one, can hear it ticking and clicking when it hits one of the pegs to turn on the heating but the heating does not fire.
Heating does not fire with timer when switched to the (I) on position...
andrewse
Thread
baxi
boiler
central heating system
diaphragm
diverter
diverter valve
flow
hot
hot water
leaking
not working
plus
timed
timer
valve
water
winter
working
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