Switch valve having a locking effect

A switch valve, comprising:

• a valve body;
• a control stem rotatably mounted on the valve body to open/close a water flow in the valve body;
• a limit ring mounted on the valve body to encompass the control stem;
• a rotation head removably mounted on the limit ring and detachably engaged with the control stem for rotating the control stem;
• wherein
• the control stem has a distal end protruding outward from the valve body;
• the limit ring has an inner wall formed with a through hole for receiving the distal end of the control stem;
• the distal end of the control stem is fully hidden in the through hole of the limit ring;
• the distal end of the control stem has a height smaller than that of the through hole of the limit ring so that the distal end of the control stem is protected by the limit ring to prevent the distal end of the control stem from being rotated directly;
• the rotation head has a first end formed with a plug removably inserted into the through hole of the limit ring and having an inside formed with a mounting hole detachably mounted on the distal end of the control stem;
• the valve body has a peripheral wall formed with a threaded locking section, and the inner wall of the limit ring has an end formed with a threaded locking section locked on the locking section of the valve body to fix the limit ring on the valve body.