| 摘要 |
A valve for water pipes comprises a housing with an inlet opening and an outlet opening with a through-flow chamber arranged between both these openings, in which a spring loaded valve spindle provided with a sealing means is arranged to work in a direction to and from an engagement surface intended for the valve spindle sealing means in the chamber, for regulating the flow through the chamber in a direction from the one opening to the other. It is characterized in that at least a part of the through-flow chamber has a cylindrical wall surface forming the engagement surface for the valve spindle sealing means, that this means has the shape of a piston traversing this wall surface, a sealing element for example in the form of a sealing ring, being mounted round the piston, and filling an intermediate space between the piston and the cylindrical wall surface, and that the valve spindle is biassed by at least two coacting springs of which the one is unloaded as the loading increases on the other, during the axial movement of the spindle caused by pressure variations in the water pipe.
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