There are approx. 4 valves on a geyser. depends which one
It will cost about $60.00 to replace a hot water gasket valve on a boiler. This is if you do it yourself. If you hire a professional, they will charge you for labor and the ending cost will be much more.
Replace the shower valve.
If shut off the hot water valve then you take off your supply line from your hot water valve to your faucet and then turn your hot water valve on slowly (with of course a bucket or something to collect the water under it) and if you can see you have water pressure and flow then most likely the problem would be in your faucet on the hot side. If you have no pressure or flow when you turn the hot valve on then it could be debris plugging your hot water pipe or your hot water service valve (angle stop, straight stop) which older galvanized pipes are known to do so. To fix the problem you would need to find out where the problem is then either fix or replace the faucet or replace the angle/straight stop or try back flushing the hot water pipe and or replace the pipe with pex or copper pipe.
Replace the pressure relief valve.
Turn the water off to the faucet. Remove the handle. The top of the faucet should unscrew to get to the ball valve. Replace the valve and gaskets then reassemble the faucet.
A malfunctioning water inlet valve can cause hot water to mix with the cold water in your washer. This may happen if the valve is not shutting off properly and is allowing hot water to flow in even when cold water is selected. It's advisable to have a professional inspect and replace the faulty valve to resolve the issue.
the hot water valve shut off valve shuts off the hot water. The cold water valve shuts off the cold water. ;()
To replace a hot water heater pressure relief valve, first, turn off the power and water supply to the heater. Drain some water from the tank to relieve pressure. Use a wrench to unscrew the old relief valve and remove it. Wrap the threads of the new relief valve with plumber's tape and screw it into place. Reconnect the water supply and power, then test the new valve for proper function.
AnswerIt could be a blocked pipe or a damaged valve. Do you get hot water in other areas of the house? If not, check the valve on the water heater. If other parts of the house get hot water, replace the hot water valve assembly or repair the hot water valve. If you have hot water at the sink, but not in the shower, the hot water side of the shower valve is clogged by something like rust. Esp. if you have had the hw heater replaced. and you have galvanized pipe instead of copper. Esp if your sink aerators get clogged by rust particles.Search for fixing Delta faucets, open up the valve, and flush out the rust.Buy a kit for replacing parts while you have it opened up.
There are no pressure valves on a regular home hot water system. If you are meaning some kind of industrial application,then say what exactly it is.
To replace the shower hot and cold valve, you will need to turn off the water supply, remove the handle and trim plate, disconnect the old valve, install the new valve, and reassemble the handle and trim plate. It is recommended to consult a professional plumber for assistance if you are not experienced with plumbing tasks.
The hot water valve should always be open, so the hot water can exit the heater into the system. If your actually meaning opening the drain valve on the bottom of theater, the water in the heater will drain, starting with the hot water stored there, and then the cold water that is entering the tank to replace it will simplt flow out the bottom before being heated. Dpending on where the heater is located will denepnd on how much of a mess the ensuing flood will be.