And a leaky toilet is not so different from acid reflux, as both involve faulty valves.

These abnormal, dilated blood vessels result from a weakening in the vessel wall or faulty valves.

The mission is already two weeks behind schedule because a faulty valve in Columbia's cooling system had to be replaced.

Delivery had been delayed due to a faulty valve that needed replacement.

But the spacecraft exploded when propellants leaked past a few faulty valves, and the mission was abandoned.

A faulty valve produced by one of the company's Chinese suppliers several years ago nearly ended the relationship with China.

Mr. Clark said faulty valves often were recorded as being rewelded by employee 2832.

The faulty valves were installed on 200 planes, almost a quarter of the 757s in the fleet, between April 1992 and May 1995.

Lastly, on systems with zone control, the problem may be caused by a faulty motorised valve which is isolating part of the system.

If the problem is a faulty valve, again call in expert help.