You can get a back water valve. It is similar to a check vale/ the back water valve goes on your main sewer line out side of home. It is desined to stop black water form coming into your home if main line stops up. Thay do make a device that can be installed into an exsisting drain it lets water through your drain but will not let water back up through you shower drain.
Though not a plumber, I can say that shower valves are usually made of brass(a very good material). Therefore they are also expensive to replace (50 dollars for the valve, 150 dollars per shower valve if done by a competent plumber). Therefore, when you notice a leak coming from your shower, try to replace the seat washer (usually the hot water side needs to be replaced first). If you still have a leak, it's time to replace the shower valve.
There is no difference between check valve and NRV, both are same
If you have any water at all coming into the sump, there will always be a little in the bottom unless it stays dry long enough for it to evaporate. The design of the pump doesn't let it pump the last little bit out. If there is not a check valve in the discharge pipe, what is left it the pipe going out will drain back into the sump. If the discharge pipe is connected to the house drain and there was not a check valve in that pipe, depending on where the kitchen clog is, the sink could drain into the sump.
It is the drain for the Temperature and Pressure relief valve (T&P valve, or TPV). It's function is to release pressure from the water heater if the pressure or temperature of the water exceeds preset limits. Do not cap off the pipe, or remove the T&P valve or alter it in any way. Doing so could cause serious injury or death! If you notice water dripping or running from the pipe, call a plumber to check it.
I don't know but I know a site that can help, the forum at Plbg.com
A shower rough-in usually refers to the distance from the wall to the center of the shower drain , measured out away from both walls in a shower to the center of the drain. It also maybe referring to the height and the center line of the placement of the shower valve.
If you mean shower valve, screws are for shower valve coverplate.
To determine if your hot water heater is leaking from the drain valve, check for water pooling around the valve or any visible signs of water dripping or leaking. If you notice these signs, it is likely that the drain valve is the source of the leak.
It stops by passing of cold into hot and visa vera
Only if the curb stop was manufactured with a drain built in. This type of valve is also known as a "Stop and Waste"
The purpose of the dishwasher drain check valve is to prevent dirty water from flowing back into the dishwasher after it has been drained. To check if the check valve is functioning properly, you can visually inspect it for any signs of damage or blockages, and also test it by running water through the drain to see if it flows in the correct direction without any leaks.
To fix a leaking shower valve, you can start by turning off the water supply to the shower. Then, disassemble the valve and check for any worn out or damaged parts such as washers or O-rings. Replace these parts as needed and reassemble the valve. Finally, turn the water supply back on and test the valve to ensure the leak is fixed.
Behind shower valve handle and trim plate
If there is no drain valve at the radiator you can drain the system at the drain valve on the boiler
To troubleshoot a shower hot/cold valve that is not functioning properly, first check for any blockages or debris in the valve. Next, inspect the valve for any leaks or damage. If the issue persists, consider replacing the valve or seeking professional help from a plumber.
To fix a shower diverter valve, you can start by turning off the water supply to the shower. Next, remove the handle and trim plate to access the diverter valve. Check for any debris or mineral buildup that may be causing the issue. Clean or replace the diverter valve if necessary. Reassemble the parts and test the shower to ensure the diverter valve is working properly. If the problem persists, consider seeking professional help.
There should be a drain valve where you can hook up a hose and then open the valve to drain.