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2

If the inlet valve (bottom, in your picture) isn't opened enough, or if the other valves aren't set right, there's not enough pressure to activate the backflow preventer, so water just spews out the top and/or sides. Check out this video on how to properly "turn on" the pressure-vacuum breaker (PVB).


0

It's a quick connector. Water pressure actually pushes the locking mechanism to hold the tube in. With the pressure completely relieved you can press the grey ring around the blue tube inward and at the same time pull the tube out.


4

Stopcocks use a cylindrical axle. Ball valves use less metal and are more reliable because the seal is a simple circle, whereas in a stopcock an entire surface has to mate. As far as machining is concerned, it is cheaper to make a ball than to make a cylinder of the same diameter and the same finish grade.


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Not to be disagreeable, but the idea of calling a spherical valve a "ball valve" seems logical to me. To call a cylindrical valve a "ball" valve would be... more strange. Actually, the term "ball valve" is distinguished as a kind of stopcock (that uses a sperical valve). But "stopcock" includes ball valves or the cylindrical kind of valve that you described....


4

A sphere allows for sealing with simple o-rings in a flat configuration. This simplifies design, component acquisition, assembly, and repair and maintenance.


1

OK. Checked the Home Centers for compression valve that would fit if I cut off the old valve. None to be had, as I thought. They only sell them for standard size pipes, not the slightly larger chromed pipe. So, just bought a new flexible feed line up to the toilet, which I needed anyhow. Then took then old valve handle and nut off, cleaned all the ...


2

The chrome pipe and valve are a unit. The chrome pipe is sized to fit over 1/2" copper and then soldered at its end. The copper likely extends a fair bit within the chrome pipe, and it's not easy to find compression fittings for the chrome pipe, so your best bets would be to repair this valve or remove and replace it. To repair it, you would shut off your ...



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