Pressure Retaining Valve Guide Section Relocation
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Solution Overview
Problem
Prior pressure control valves suffer from soiling in the narrow annular gap between the valve stem and guide disk, which impairs functionality due to minimal fluid flow, leading to reduced shut-off force and reliability.
Innovation Solution
The shut-off body's guide section is shifted into the inlet channel, forming a hollow-cylindrical guide bushing, with surfaces A1 and A2 designed to counteract the spring force, ensuring the guide section is flushed with fluid and preventing impurity accumulation, thus maintaining valve reliability and extending service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a narrow annular gap is formed between the valve stem and guide disk to guide the shut-off body, then guidance function is improved, but the gap becomes soiled due to minimal fluid flow, impairing valve functionality
Solution Approach 1:
The guide section is extracted from the outlet channel area and relocated to the inlet channel area, where it forms a guide bushing. This extraction removes the problematic narrow annular gap from the contaminated outlet side and places it in the cleaner inlet side with adequate fluid flow to prevent soiling.
Solution Approach 2:
The fluid flowing through the inlet channel serves a dual function: it conveys the fluid through the system and simultaneously flushes the guide section, preventing accumulation of impurities. The system uses its own operating fluid to maintain cleanliness of the guidance components.
2Device complexity
If the guide section is located in the outlet channel area, then the valve structure is compact, but impurities accumulate in the guide gap, reducing service life
Solution Approach 1:
Instead of placing the guide section in the outlet channel as in conventional designs, the guide section is inverted to the inlet channel location. This reversal changes the fluid flow direction relative to the guide section, ensuring continuous flushing that prevents impurity accumulation and extends service life.
3Stress or pressure
If surfaces A1 and A2 are designed to counteract spring force, then back pressure is reduced, but the force balance requires precise surface area selection
Solution Approach 1:
The design changes the pressure distribution parameters by creating specific effective surfaces A1 and A2 that experience fluid pressure. By carefully selecting the areas of these surfaces, the hydrostatic forces are adjusted to counterbalance the spring force, achieving near-zero back pressure operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures the guide section is regularly flushed with fluid, preventing soiling and maintaining effective fluid conveyance, enhancing the valve's reliability and service life by compensating forces acting on the valve, making it almost completely free of back pressure.
Implementation Method 1
a spring element with a spring force, which is arranged in the fluid-free section of the pressure-retaining valve, the spring element being arranged such that its spring force prestresses the sealing surface of the shut-off body in the direction of the sealing surface of the valve seat
Implementation Method 2
a fluid flowing in through the inlet channel is present at the shut-off body in such a way that the fluid exerts a force on the shut-off body which counteracts the spring force of the spring element
Data Source
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AI summary
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.