Rail Brake Vent Valve for Rapid Residual Pressure Release
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Solution Overview
Problem
Pneumatic braking systems in rail vehicles face issues with incomplete brake release due to malfunctions, leading to undesirable noise emissions, rapid wear, and continuous energy consumption, which existing solutions like quick-release valves and throttles with differential pressure measurement fail to address effectively.
Innovation Solution
A vent valve with a piston chamber, valve piston, and sealing element that closes a vent opening during brake pressure application, and opens when pressure equalizes, allowing quick release of residual brake pressure without additional components or pressure measurement, using a valve spring to control opening based on differential force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a quick-release valve is installed upstream of the brake cylinder, then the brake release time is shortened, but the device complexity increases and the reliability decreases due to additional components that can malfunction
Solution Approach 1:
The patent combines the vent valve functionality directly into the existing control valve housing, merging two functions (pressure control and venting) into a single integrated component. This eliminates the need for a separate quick-release valve while maintaining rapid brake release capability through the integrated vent channel and valve piston mechanism.
Solution Approach 2:
The control valve is designed to perform multiple functions: normal pressure control during braking and rapid venting during brake release. The integrated vent valve mechanism allows the control valve to serve as both a pressure regulator and a quick-release device, reducing the total number of components needed in the braking system.
2Speed
If a throttle with differential pressure measurement is used, then the brake release speed is improved, but the device complexity and measurement requirements increase
Solution Approach 1:
The vent valve piston automatically responds to pressure differential across the throttle without requiring external pressure sensors or measurement systems. The piston itself acts as the sensing element, using the pressure difference to trigger venting when a threshold is reached, eliminating the need for separate measurement devices while maintaining rapid release capability.
3Loss of time
If the vent opening remains open, then residual brake pressure is released quickly, but brake pressure cannot be built up during braking operation
Solution Approach 1:
The vent valve piston dynamically changes the state of the vent opening based on real-time pressure conditions. During braking, the piston closes the vent opening to maintain pressure; during release, the pressure differential automatically opens the vent channel. This dynamic response ensures the vent opening is closed during pressure buildup and opens automatically when pressure equalization is needed.
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
Ensures rapid and reliable release of brake pressure after braking, preventing brake jamming and wear, with minimal components and easy integration, while detecting malfunctions through pressure monitoring.
Implementation Method 1
a valve spring, for example in the form of a helical spring, which bears with a rear end piece against the front side of the valve piston and with a front end piece against the valve body
Implementation Method 2
a sealing element is held on the front side of the valve piston, which sealing element faces the vent opening and by means of which the vent opening can be closed when the valve piston is displaced against the valve body
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
The vent valve (1), which is provided in particular for braking devices (100) in rail vehicles (5), comprises a valve housing (11) having an inlet channel (1110), and a valve head (12) held by the valve housing (11), which has an outlet channel (1260), and which comprises a valve body (125) with at least one vent channel (122) provided therein, which extends from a vent opening (120) to an outer side of the valve body (125). According to the invention, the valve housing (11) has a piston chamber (110) which, on the one hand, connects to the inlet channel (1110) and, on the other hand, to the vent opening (120) of the at least one vent channel (122); that the valve body (125) has at least one through-channel (121) which connects the piston chamber (110) to the outlet channel (1260), that a valve piston (13) is provided,- which is mounted in the piston chamber (110) coaxially to a working axis (x) of the piston chamber (110) displaceably against the valve body (125), - which has a rear side (13R) facing the inlet channel (1110), a front side (13F) facing the valve body (125) and at least one piston channel (130) which runs from the rear side (13R) to the front side (13F), that a sealing element (15) is held on the front side (13F) of the valve piston (13), which sealing element faces the vent opening (120) and by means of which the vent opening (120) can be closed when the valve piston (13) is displaced against the valve body (125), and that a valve spring (14) is provided, which is connected to a rear end piece (142) on the front side (13F) of the valve piston (13) and to a front end piece (141) on the valve body (125).