PRESSURE RETENTION VALVE

摘要

From the prior art, a pressure retention valve is known, comprising a housing having an inlet channel and an outlet channel, wherein the inlet channel and the outlet channel can be connected to each other, a separating membrane dividing the housing in two sections, a first section conducting fluid during operation of the value, and a second section that is fluid-free during operation of the valve, a valve seat, which is disposed in the fluid-conducting section of the housing, having a sealing surface, wherein the valve seat defines an end of the inlet channel, a shut-off body, which is movably disposed in the fluid-conducting section of the housing, having a sealing surface, and a spring element having a spring force, which is disposed in the fluid-free section of the pressure retention valve. The spring element is disposed such that the spring force thereof preloads the sealing surface of the shut-off body in the direction of the sealing surface of the valve seat, such that the sealing surfaces are engaged with each other in a position of the shut-off body that closes the valve and the shut-off body separates the inlet channel from the outlet channel. The inlet channel is disposed such that a fluid flowing in through the inlet channel during operation of the valve is applied to the shut-off body such that the fluid exerts a force on the shut-off body, which acts counter to the spring force of the spring element. A guide disk, which displaceably guides the valve stem, is provided between the separating membrane and the valve seat, wherein the guide disk surrounds the valve stem forming a narrow annular gap acting as a throttle point. The narrow annular gap between the valve stem and guide disk in the prior art, through which no or only very small amounts of fluid flow, tends to soil, which can impair the functional capability of the valve. In contrast, it is the aim of the present invention to provide a pressure retention valve that prevents this problem. To this end, according to the invention a pressure retention valve of the type described above is further developed such that the shut-off body comprises a guide section, which extends into the inlet channel, and wherein the inlet channel is designed in some sections such that it forms a guide bushing in which the guide section of the shut-off body is received in a guided manner.