초록 ▼

An adjustable pressure limiting valve having a non-linear biasing means. The valve has a movable valve member that can be moved to an open position by a predetermined pressure and a closed position on a valve seat. A rotating control knob is rotated by the user to adjust the bias acting against the

An adjustable pressure limiting valve having a non-linear biasing means. The valve has a movable valve member that can be moved to an open position by a predetermined pressure and a closed position on a valve seat. A rotating control knob is rotated by the user to adjust the bias acting against the movable valve member toward the closed position to, in turn, set the pressure at which the valve opens. A rotating cylindrical drum rotates along with the control knob and has a helical groove formed in its exterior and a pair of fixed pins that ride in the helical groove. When the cylindrical drum is rotated, the fixed pins riding in the helical grove cause the cylindrical drum to move along its longitudinal axis to compress or decompress a spring acting against the movable valve member. The pitch of the helical groove is designed so as to create a non-linear relationship between the rotational movement of the control knob and the longitudinal movement of the cylindrical drum.

대표청구항 ▼

[ I claim:] [1.] An adjustable pressure limiting valve, the valve comprising:a body having an inlet and an outlet and a passageway extending therebetween;a valve seat positioned at the inlet of the body;a movable valve member adapted to move with respect to the valve seat between an open position wh

[ I claim:] [1.] An adjustable pressure limiting valve, the valve comprising:a body having an inlet and an outlet and a passageway extending therebetween;a valve seat positioned at the inlet of the body;a movable valve member adapted to move with respect to the valve seat between an open position wherein the passageway is open and a closed position wherein the passageway is closed;a biasing means positioned to provide an adjustable bias force on the movable member toward the closed position, the biasing means including a control knob operable by a user by rotation;a cylindrical drum adapted to rotate with the control knob, the cylindrical drum having an external surface having a helical groove formed therein; anda pin means fixed to the valve body and adapted to be received within the helical groove formed on the cylindrical drum such that the cylindrical drum and pin means translate the rotational movement of the control knob into longitudinal movement of the cylindrical drum toward and away from the movable valve member;wherein the relationship between the rotational movement of the control knob and the longitudinal movement of the cylindrical drum is non-linear such that the relationship between the rotational movement of the control knob and the change in the bias force on the movable member is also non-linear.