My shower control is the single-handle type. Turn it a slightly to
get cold water and turn it 180 degrees to get full hot water. I
notice that if I connect the cold water line but do not connect the
hot water line then the valve does not let any cold water go through
regardless of the valve handle angle. Is this valve broken?

On Jun 25, 10:21 pm, wrote:
My shower control is the single-handle type. Turn it a slightly to
get cold water and turn it 180 degrees to get full hot water. I
notice that if I connect the cold water line but do not connect the
hot water line then the valve does not let any cold water go through
regardless of the valve handle angle. Is this valve broken?

It is likely a pressure balanced faucet, which restricts flow when the
pressure drops on either side to prevent scalding. Hook up the other
side and see if you get anything. If it works, it isn't broken.

JK

wrote in message
ps.com...
My shower control is the single-handle type. Turn it a slightly to
get cold water and turn it 180 degrees to get full hot water. I
notice that if I connect the cold water line but do not connect the
hot water line then the valve does not let any cold water go through
regardless of the valve handle angle. Is this valve broken?


Sounds like an anti-scald valve. It needs pressure on both sides to work.
The object is if there is a pressure drop on one side, it shuts the other
side down to minimize big temperature fluctuations. Most are adjustable to
the maximum temperature it will allow. No, it is not broken.