Slide Valve Venturi Chamber Relief for Constant Pressure Drop
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Solution Overview
Problem
Conventional pressure valves experience a significant increase in pressure drop as flow increases, failing to maintain a substantially constant pressure drop despite varying fluid flow rates.
Innovation Solution
The pressure valve design incorporates a slide valve with a cylindrical skirt and a conical or spherical head that includes depressurization holes, creating a diverging annular space to utilize the Venturi effect, reducing pressure in the chamber and increasing the passage section as flow increases, thereby maintaining a constant pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring stiffness is increased to maintain valve closure at higher pressures, then the valve remains closed more effectively, but the valve displacement and passage section increase very slightly with flow, causing pressure drop to increase significantly
Solution Approach 1:
A communication hole is introduced as an intermediary element between the chamber and the downstream side. This hole allows pressure equalization that mediates the force balance on the valve, enabling the valve to remain closed at higher pressures without requiring excessive spring stiffness, thereby preventing significant pressure drop increases
Solution Approach 2:
The invention changes the pressure parameter in the chamber by introducing a communication hole that connects the chamber to the downstream side. This parameter change allows the chamber pressure to vary with flow rate, adjusting the valve opening characteristics to maintain constant pressure drop while ensuring reliable closure
2Reliability
If the spring pretension is increased to raise the opening differential pressure threshold, then the valve opens at higher pressures, but the passage section remains limited by small valve displacement, causing pressure drop to increase with flow
Solution Approach 1:
The communication hole acts as an intermediary that allows the chamber pressure to respond to downstream conditions. This mediates the relationship between spring pretension and opening threshold, allowing the valve to maintain proper opening pressure while accommodating larger displacements that reduce pressure drop
Solution Approach 2:
The invention introduces dynamic behavior to the chamber pressure through the communication hole, allowing the pressure to vary with flow rate. This dynamic adjustment enables the valve to maintain the desired opening threshold while allowing sufficient displacement to maintain constant pressure drop across varying flows
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 a substantially constant pressure drop across varying flow rates, allowing for efficient fluid passage and valve opening, as illustrated by the reduced pressure drop curve with increased flow.
Implementation Method 1
each hole opening into a space communicating with each discharge opening, being located opposite the face of the seat and downstream of the lip relative to the intake opening, this annular space delimiting with the lip a widening forming a diverging portion for the fluid passing through the valve in order to reduce the pressure in the chamber by the Venturi effect when the slide valve is open
Data Source
AI summary
A pressure valve including a body including at least one admission opening and at least one discharge opening, a slide valve sliding in the body, the slide valve defining a chamber, with the body, and including a head arranged facing a seat of the admission opening, a spring pressing the head of the slide valve against the seat, a lip for applying the head to the seat. The head includes at least one hole bringing the chamber into communication with the discharge opening, each hole being arranged facing the seat and downstream from the lip in relation to the admission opening in order to reduce the pressure in the chamber by a Venturi effect when the slide valve is open.