Why it calls angle valve?

Why it calls angle valve?
Angle valves are similar to the spherical valve and the structure and characteristics are modified by ball-type valves. which we can different from spherical valve is that Angle valve‘s exports and imports is 90 degree angles.
Angle valves also called triangle valve, Angular valves, and folding Angle valves. This is because pipeline in Angle valves place into 90 degrees of corner shape, so called Angle valves, Angle valves, folding Angle valves. Angle valve body has inlet, the water control mouth, outlet three mouths, so called triangle valve. Now, Angle valves in the unceasing improvement, though it has three mouths, but there are also not Angle of fractal Angle valve.