Water flow control device with pre-adjustable output

A water flow control device with pre-adjustable output, comprising:

• a housing assembly, comprising a water inlet channel and a water outlet channel, with a flow regulation chamber interposed between them;
• the flow regulation chamber is configured as a linear structure extending along a central axis and includes a front opening and a rear opening;
• the water inlet channel and the water outlet channel are arranged in an offset configuration, and the flow regulation chamber intersects and communicates with the water inlet channel;
• a control shaft, accommodated within the flow regulation chamber, configured to be rotatable and axially movable, comprising a front section extending through the front opening, a rear section aligned with the rear opening, a rear terminal end, and a flow modulation section positioned between the front and rear sections, wherein the flow modulation section aligns with a region between the water inlet and outlet channels, and the control shaft is operable in a forward position and a backward position, providing dynamic modulation of a water flow rate during use;
• a front seal ring, mounted on the front section of the control shaft to achieve a watertight seal with the flow regulation chamber;
• a rear seal ring, mounted on the rear section of the control shaft to achieve a watertight seal with the flow regulation chamber;
• an intermediate seal ring, installed adjacent to the rear end of the flow modulation section, with the rear seal ring located between the intermediate seal ring and the rear terminal end of the control shaft, wherein when the control shaft is in the forward position, the intermediate seal ring closes the water outlet channel in a water-sealed state, and when in the backward position, the control shaft forms a water-flowing state where the water inlet channel communicates with the water outlet channel;
• a reset mechanism, incorporated at a corresponding position on the control shaft to provide an automatic restoring force that biases the shaft toward the front opening;
• a flow adjustment mechanism, mounted at a corresponding position on the control shaft to rotationally adjust an angle of the flow modulation section, thereby regulating the water flow rate;
• and
• a trigger handle, pivotally mounted on the housing assembly, having an actuating surface that engages the front section of the control shaft.