Thermally volume-neutral stroke transmitter, in particular for metering valve without hydraulic compensator

摘要

In addition to liquid in a thermal volume-neutral stroke transmitter, first and/or second displacement body(ies) is/are positioned in the stroke transmitter, for displacing the liquid. These three materials in the closed system are designed so that the stroke transmitter remains pressure-free during temperature changes.

主权项

1. A stroke transmitter, comprising:
an overall housing having
a first housing component enclosing a first volume which is variable by displacement of a first effective cross-sectional area and which is filled with a fluid, anda second housing component enclosing a second volume which is variable by displacement of a second effective cross-sectional area and which is filled with the fluid, the overall housing externally delimiting a total volume equal to a first sum of the first and second volumes; a throttling port permitting fluid exchange between the first and second volumes, where a first product formed by a first stroke of the first effective cross-sectional area times a ratio of the first effective cross-sectional area to the second effective cross-sectional area corresponds to a second stroke of the second effective cross-sectional area; and at least one displacement element positioned in the total volume, where the overall housing, the fluid and the at least one displacement element are coordinated to complement one another so that a change in the total volume of the overall housing caused by a change in temperature corresponds to a combined change in fluid volume and at least one displacement element volume caused by the change in temperature.