Patent ID: 6631883
Filing Date: 2003-10-14
Classification: F02M,F16K,Y02T

Abstract:
A metering valve for metering a fluid, comprising a housing connected to a fluid supply line and including at least one metering opening and at least one closing member which is movable in the housing between a position closing the metering opening and a position leaving the opening at least partially clear, with the closing member biased by at least one pneumatic or hydraulic spring co-acting therewith urging the closing member to its closed position and with the closing member arranged to be placed in the other position counter to the bias by operating means, with the pneumatic or hydraulic spring driven by the fluid for metering and including two chambers arranged in the housing and separated by the closing member, with each chamber having at least one supply opening connected to the fluid supply line, with the fluid supply line connected to the housing at the same side of the closing member as the metering opening, with the chamber at that side of the closing member forming a through-flow chamber and the chamber at the opposite side of the closing member constituting a control chamber, with the supply openings in the chambers dimensioned such that with the closing member in a position leaving the metering opening at least partially clear the pressure of the fluid in the through-flow chamber is lower than the pressure in the control chamber, and with the valve configured such that the closing member is biased to its closed position solely by the pneumatic or hydraulic spring, and further including a metal attraction element connected to the closing member and an electromagnet positioned adjacent to the metal attraction element wherein, upon energizing, the electromagnet is adapted to move the metal attraction element and thereby to move the closing member to the position leaving the opening at least partially clear.