Alternating state pressure regulation valved damper

A suspension damper comprising:

• a single cylinder defining a substantially liquid filled cavity;
• a rod extending into the cavity;
• a plate attached to the rod inside the cavity;
• a piston slidably positioned in the single cylinder and attached to the plate, the piston separating the cavity into a compression chamber and an extension chamber;
• wherein the piston is slidable in a compression direction such that an increasing volume of the rod enters the cavity and in an extension direction such that an increasing volume of the rod exits the cavity wherein a passage is provided through the piston so that a liquid exchange is effected between the extension chamber and the compression chamber during sliding of the piston in the extension and compression directions;
• wherein the passage has a first branch and a second branch, the liquid exchange being selectively effected through the first branch that includes a bi-directional deflectable first single annular disc tuned to effect a relatively soft damping rate controlling damping forces at all flow rates in both directions during extension direction and compression direction travel of the piston and the first branch also including a remotely operated control valve being selectively positioned in an open position substantially freely allowing liquid exchange through the first branch and a closed position substantially preventing liquid exchange through the first branch and the liquid exchange being selectively effected through the second branch that includes a bi-directional deflectable second single annular disc tuned to effect a relatively firm damping rate wherein when the remotely operated control valve is in the open position the monotube suspension damper develops a first damping rate wherein force is dependent upon velocity of the sliding piston and the first damping rate is substantially dependent upon the deflective characteristics of the first single annular disc and the second annular disc in parallel and when the remotely operated control valve is in the closed position the suspension damper develops a second damping rate wherein force and the second damping rate are dependent upon velocity of the sliding piston substantially as a result of the deflective characteristics solely of the second single annular disc;
• wherein the control valve responds to an electromagnetic force generated by in a magnetic circuit by a selectively energized electrical circuit wherein the plate is a conductor as a part of the electrical circuit and as part of the magnetic circuit.