Valves with overdriven protection
A valve comprises a drive rod, a diaphragm, and a chamber. The chamber contains the diaphragm, and the chamber is blocked by the diaphragm driven to reach a bottom of the chamber. A limiting element encircles the drive rod to contain a section of the drive rod, and the limiting element is configured to prevent the drive rod from being overdriven.
1 . A valve comprising:
a controller comprising:
a drive rod;
a diaphragm driven by the drive rod;
a knob for rotating the drive rod and the knob moves with the drive rod; and
an inner case installed inside the controller wherein the inner case has a through hole for containing a part of the drive rod and a colored ring encircles an upper opening of the inner case; and
a body comprising:
an opening covered by the controller;
a chamber containing the diaphragm moving inside the chamber wherein the chamber is blocked by the diaphragm driven to reach a bottom of the chamber; and
a limiting element encircling the drive rod to contain a section of the drive rod wherein the limiting element is configured to be fixed at a position of the drive rod to prevent the drive rod from being overdriven and the colored ring is totally covered by the knob when the diaphragm reaches a position to totally block the chamber.
2 . The valve of claim 1 , wherein the knob has an opening shell to contain the limiting element, and the opening shell has longitudinal protrusions and grooves on an inner wall to match longitudinal protrusions and grooves on an outer wall of the limiting element.
3 . The valve of claim 1 , wherein the limiting element moves with the drive rod until the limiting element touches the inner case, and the drive rod stops moving when the limiting element stops moving.
4 . The valve of claim 1 , further comprising a threaded sleeve encircling the inner case and covering the opening.
5 . The valve of claim 1 , further comprising a protruding ring encircling a bottom end of the drive rod to prevent the drive rod from disengaging the inner case.
6 . The valve of claim 1 , further comprising a connector with a rod inserted into the diaphragm and a round indentation to be inserted by the drive rod.
7 . A valve comprising:
a controller comprising:
a drive rod;
a diaphragm driven by the drive rod;
a knob for rotating the drive rod and the knob moves with the drive rod; and
an inner case installed inside the controller wherein the inner case has a through hole for containing a part of the drive rod, and a colored ring encircles an upper opening of the inner case; and
a body comprising:
an opening covered by the controller;
a chamber containing the diaphragm moving inside the chamber wherein the chamber is blocked by the diaphragm driven to reach a bottom of the chamber; and
a limiting element encircling the drive rod to contain a section of the drive rod wherein a thickness of the limiting element is configured to set a length of the section of the drive rod to prevent the drive rod from being overdriven and the colored ring is totally covered by the knob when the diaphragm reaches a position to totally block the chamber.
8 . The valve of claim 7 , wherein the limiting element moves with the drive rod until the limiting element touches the inner case, and the drive rod stops moving when the limiting element stops moving.
9 . The valve of claim 7 , further comprising a protruding ring encircling a bottom end of the drive rod to prevent the drive rod from disengaging the inner case.