All Toilet valves going bad

I've replaced 3 out of 4 toilet valves over the last month and now the 4th has gone bad. Suggestion on what could be making them all go bad at the same time or do you think it is just age?

With no more details than you give, it is really just guesswork to give any kind of possible answers, but here are a couple of thoughts. Do you perhaps have sand in the water supply that could be clogging the valves? Do you use chemical cleaning products in the toilet tank? How old are the valves? It could be age, but on 3 out of 4 in a month or seems a bit odd. It would help to know how the valves failed.

Not a plumber (but do have a very good one ) but I've read that a failing pressure regulator can cause problems with valves and the like. Are there any problems with other fixtures dripping/leaking?

Mort

Have the water pressure checked!

Checking your water pressure is an excellent idea. You do not need to call anyone to do this. Just go to any hardware store and purchase a water pressure gauge that attaches to a standard hose bib. This could at your washing machine or any other faucet with hose threads. Then turn the faucet on and read the pressure. If the pressure is much over 60 psi, it is too high and you should have a pressure regulator installed or if one is already in place, reset or replace it as they do sometimes fail. This valve is a bell shaped device usually found very close to where you water supply enters the house. Not part of you present problem but nevertheless important, is a pressure regulator requires a thermal expansion tank to be install also. There have been numerous discussions on this forum regarding these devices and I won't rehash all of that business now. Suffice it to say that excessive pressure can and does harm appliances such as toilets, so this could be a possible cause of your valve failures.

If the valves are all the same age, chances are that they've reached the end of their life.

But it would really be helpful to know what type of valves they are and why they failed.

valves

If they are American Standard "Smart valves" or similar, then they were no good the day they were installed and have just gotten worse.

If some work was done recently either in your house water supply, or in the neighborhood, some debris might have been stirred up which is gumming up the fill valves.