Cylinder valve assembly with actuatable on-off control

A cylinder valve assembly comprising:

• a valve body including
• (a) a probe chamber and a proximal chamber disposed along a main axis,
• (b) an intermediate chamber extending along the main axis between the probe chamber and the proximal chamber,
• (c) a control port extending radially of the main axis,
• (d) a bypass channel in fluid communication between the intermediate chamber and the control port, and
• (e) a control channel including a control valve seat and being disposed between the control port and the probe chamber;
• a valve pin at least partially received by the intermediate chamber and movable along the main axis between a closed position and an open position;
• and
• a control plug received by the control port and being threadedly actuatable between an on position and an off position, the control plug including a control valve axial seal configured to
• (a) be in sealing engagement with the control valve seat when the control plug is in the off position, thereby sealing the control channel from fluid communication with the control port, and
• (b) be disengaged from the control valve seat when the control plug is in the on position, thereby allowing fluid communication between the control channel and the control port;
• wherein
• (a) when the valve pin is in the open position and the control plug is in the on position, the proximal chamber and the probe chamber are in fluid communication with one another through the valve body by way of the intermediate chamber, the bypass channel, the control port and the control channel, and
• (b) when either the valve pin is in the closed position or the control plug is in the off position, the proximal chamber and the probe chamber sealed from fluid communication with one another through the valve body.