초록 ▼

A valve for causing pulsatile flow in a multi-piston plunger pump includes a valve poppet, a valve seat, and a spring biasing the valve poppet against the valve seat; and a mechanism holding the valve poppet in an open position, thereby producing pulsatile flow from the pump. The mechanism includes

A valve for causing pulsatile flow in a multi-piston plunger pump includes a valve poppet, a valve seat, and a spring biasing the valve poppet against the valve seat; and a mechanism holding the valve poppet in an open position, thereby producing pulsatile flow from the pump. The mechanism includes a magnet and an adjustment mechanism for moving the magnet toward and away from the valve poppet. When the magnet is moved toward the valve poppet, the magnet attracts the poppet away from the valve seat, and when the magnet is moved away from the valve poppet, the magnet releases the poppet. The spring then biases the poppet against the valve seat in a closed position.

대표청구항 ▼

What is claimed: 1. An apparatus for disabling a valve assembly in a pump, the pump defining a bore for receiving the valve assembly, the valve assembly including a valve poppet, a valve seat, and a spring biasing the valve poppet against the valve seat, the apparatus comprising: a magnet attractin

What is claimed: 1. An apparatus for disabling a valve assembly in a pump, the pump defining a bore for receiving the valve assembly, the valve assembly including a valve poppet, a valve seat, and a spring biasing the valve poppet against the valve seat, the apparatus comprising: a magnet attracting the valve poppet away from the valve seat, thereby holding the valve poppet in an open position; an adjustment mechanism for moving the magnet toward and away from the valve poppet, whereby when the magnet is moved toward the valve poppet, the magnet attracts the poppet away from the valve seat, and when the magnet is moved away from the valve poppet, the magnet releases the poppet, the spring thereby again biasing the poppet against the valve seat in a closed position; (c) further comprising a casing enclosing the magnet wherein the casing has a bore therethrough; (d) wherein the bore encloses an adjusting rod attached to the magnet, the adjusting rod reciprocating within the bore; and (e) wherein the adjusting rod is threaded within the bore and further comprises a threaded portion. 2. The apparatus of claim 1, wherein the magnet is a rare earth magnet. 3. The apparatus of claim 1, further comprising a seal between the adjusting rod and the casing. 4. The apparatus of claim 1, further comprising a stem on the adjusting rod having a diameter larger than the threaded portion of the adjusting rod, thereby preventing the adjusting rod from completely leaving the bore. 5. The apparatus of claim 1, further comprising a handle engaging the adjusting rod for incremental movement of the adjusting rod within the bore. 6. A valve for causing pulsatile flow in a multi-piston plunger pump, the valve comprising: (a) a valve poppet, a valve seat, and a spring biasing the valve poppet against the valve seat; and (b) a mechanism holding the valve poppet in an open position, thereby producing pulsatile flow from the pump; (c) wherein the mechanism further comprises a magnet and an adjustment mechanism for moving the magnet toward and away from the valve poppet, whereby when the magnet is moved toward the valve poppet, the magnet attracts the poppet away from the valve seat, and when the magnet is moved away from the valve poppet, the magnet releases the poppet, the spring thereby again biasing the poppet against the valve seat in a closed position; (d) further comprising a casing enclosing the magnet wherein the casing has a bore there through wherein the bore encloses an adjusting rod attached to the magnet, the adjusting rod reciprocating within the bore; and (e) wherein the adjusting rod is threaded within the bore and further comprises a threaded portion. 7. The apparatus of claim 6, wherein the magnet is a rare earth magnet. 8. The apparatus of claim 6, further comprising a seal between the adjusting rod and the casing. 9. The apparatus of claim 6, further comprising a stem on the adjusting rod having a diameter larger than the threaded portion of the adjusting rod, thereby preventing the adjusting rod from completely leaving the bore. 10. The apparatus of claim 6, further comprising a handle engaging the adjusting rod for incremental movement of the adjusting rod within the bore. 11. The apparatus of claim 6, further comprising a spacer preventing the magnet from getting too close to the valve poppet and thereby holding the valve poppet against the valve seat.