A by-pass ball valve, defining first, second and third ports lying respectively n three parallel planes, is made using two forged parts, a valve body and an elbow element, to reduce the number of operations required to seal the valve to one sealing operation. WATER POWER CONTROL VALVEA valve control stem is mounted on the side of the valve and rotated through only 90° to facilitate switching the fluid path through the valve between a first path from the first port to the second port and a second path from the first port to the third port.Globe Valves The first port may be directed in a first direction with the second and third ports directed in second and third directions, respectively. However, it is currently preferred to have the second direction be the same as the third direction and to have all three directions lying in a single plane which is perpendicular to the three parallel planes of the first, second and third ports.Ball Valves While the elbow element may be used directly to secure the ball valve and ball seals within the valve body, to facilitate assembly of the valve and to provide an auxiliary seal, a rotary ball valve retaining bonnet is secured within the valve body and includes an auxiliary seal which is engaged and crushed, to the extent necessary, by the elbow element to properly orient the elbow element relative to the valve body prior to sealing the valve. A by-pass ball valve including a first port having a first axis, a second port having a second axis and a third port having a third axis, said first, second and third axes being parallel to but offset from one another, said by-pass ball valve comprising: a valve body defining a neck portion, said first port, said second port and a ball receiving cavity interconnecting said first port and an offset channel leading to said second port, said ball receiving cavity terminating in a ball entrance channel; a rotary ball valve positioned within said ball receiving cavity of said valve body between a first annular ball seal adjacent said offset channel and a second annular ball seal adjacent said ball entrance channel, said rotary ball valve defining a passage therethrough which can be rotated between a first position connecting said first port to said second port and a second position connecting said first port to said third port; a rotatable operating stem sealingly retained within said neck portion and engaging said rotary ball valve for rotation of said rotary ball valve within said valve body between said first and second positions; and an elbow element engagable with said ball entrance channel and defining said third port, said valve body and said elbow element defining a single band around which said by-pass valve can be sealed. This need is met by the invention of the present application wherein a by-pass ball valve, defining first, second and third ports lying respectively in three parallel planes, is made using two forged parts, a valve body and an elbow element, to reduce the number of operations required to seal the valve to one sealing operation. A valve control stem is mounted on the side of the valve and rotated through only 90° to facilitate switching the fluid path through the valve between a first path from the first port to the second port and a second path from the first port to the third port. While the first port may be directed in a first direction with the second and third ports directed in second and third directions, respectively, as illustrated and currently preferred, the second direction is the same as the third direction and all three directions lie in a single plane which is perpendicular to the three parallel planes of the first, second and third ports. While the elbow element may be used directly to secure the ball valve and ball seals within the valve body, to facilitate assembly of the valve and to provide an auxiliary seal, a rotary ball valve retaining bonnet is secured within the valve body and includes an auxiliary seal which is engaged and crushed, to the extent necessary, by the elbow to properly orient the elbow element relative to the valve body prior to sealing the valve.

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