Hot water plumbing pressure problem

I had a new water heater installed about a year ago. I have noticed that over the course of the year the pressure has gotten worse to the point that in the bathroom furthest from the hot water heater there is barely any pressure coming from hot water in bathtub. When they installed the new water heater they added a valve on the inlet side of the water heater. Is it possible that this valve is either corroded with sediment or bad all together. Please any help would be appreciated.
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There is crud in the lines before the valve. You can tear out the valves and flush or use my handy "back flush" system.
1. Turn off power or gas to hot water heater. 2. Turn off cold water valve supplying cold water to the hot water heater. 3. Connect garden hose (going outside) to water heater drain and open drain. 4. Go to bathtub, place a cap or one of those shower on/off valves on the shower. Turn center valve so water is directed to shower instead of tub. 5. Fully open cold and hot water valves for shower. 6. Let flow for about 10 minutes. 7. Do same with faucets, except you can't easily cap them, so hold rag over faucet.
What you are doing is getting the cold water to flow in one end of the faucet then flow back out the hot water side. And hopefully this will also move the crud back to the hot water heater, and out the drain. i.e. back flushing the hot water pipes.
"Mike" wrote in message

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If the valve is blocked it would effect all your fixtures not just one. So are all the fixtures losing pressure ? ( your actually loosing volume) Did they install new dielectric nipples? they look like a 3/4" galvanized nipple screwed directly into the water heater. If so some have a built in check valve, This could be causing a problem could be stuck. If it is just the bathroom it could be sediment is stuck in the fixture. Allot of times when you work on a plumbing system crap gets in the lines.
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Thank you for the fast reply. All of the fixtures have lost pressure. The ones on the far side of the house are just the worst.
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Anymore input would be greatly appreciated
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It could be allot of things. Is the house copper or galvanized pipe ? Old galv. gets corroded and blocks the water. That would be a major repair. It could be the valve they installed. Have you tried opining and closing it a couple times? Maybe close the inlet valve drain some water out of the tank try opining and closing the valve a couple times Might free something up. If it's a gate valve sometimes the stem breaks You will know if it just keeps spinning.
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