Double-Acting Valve Piston Pressure Reducer for Compressed Air Tools
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Solution Overview
Problem
Existing pressure-reducing devices for compressed air tools struggle to efficiently manage high inlet pressures from pressure medium accumulators, leading to inefficiencies and safety concerns, particularly when used with tools operating at higher working pressures, and require a compact and reliable solution to extend operating times and ensure safe operation.
Innovation Solution
A compressed air distributor with a pressure reducing device featuring a double-acting valve piston and a pressure reducing valve that separates the input pressure channel from the working pressure chamber, combined with a venting device for automatic venting upon disconnection of the pressure medium reservoir, ensuring safe operation and reduced pressure losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a pressure reducing device is designed for high inlet pressures from pressure medium accumulators, then the working pressure can be reliably reduced to extend operating times, but the device size and weight increase
Solution Approach 1:
The patent combines the pressure reducing device with the device connection part into an integrated unit. The pressure reducing device (10) and device connection part (51) are merged such that the working pressure outlet (20) of the pressure reducing device directly connects to the working pressure inlet (70) of the device connection part, eliminating the need for separate components and reducing overall weight while maintaining reliable pressure reduction for extended operating times
Solution Approach 2:
The device connection part (51) is designed with multiple device connection devices (53, 54) that can connect to different types of working devices simultaneously. The pressure reducing device (10) serves multiple functions by providing both direct working pressure output and reduced working pressure through the pressure reducing valve (58), making the overall system more versatile without requiring additional weight
2Area of moving object
If a pressure reducing valve is used to reduce working pressure, then tools can operate at higher pressures with smaller piston areas, but pressure losses increase
Solution Approach 1:
The patent applies different pressure levels to different locations within the system. The device connection device (53) provides direct connection to tools requiring higher working pressure (20-25 bar) with smaller piston areas, while the device connection device (54) with pressure reducing valve (58) provides reduced working pressure for tools requiring lower pressure. This local differentiation optimizes piston area for each tool type while minimizing overall pressure losses by avoiding unnecessary pressure reduction
3Weight of moving object
If the pressure reducing device is made compact for direct mounting on working devices, then weight is reduced, but the complexity of integrating pressure reduction and venting functions increases
Solution Approach 1:
The patent merges the venting device (41) with the device connection part (51) by forming the venting cylinder (42) as part of the device connection housing (71). The venting piston (44) is integrated into the device connection part, and the venting channel (40) connects directly to the working pressure chamber (17). This integration achieves a compact design that reduces weight while managing complexity through functional consolidation rather than separation of components
4Volume of moving object
If the venting device is integrated into the pressure connection device, then the overall device size is reduced, but the reliability of pressure separation becomes more critical
Solution Approach 1:
The patent introduces a diaphragm (67) as an intermediary element that reliably separates the high-pressure inlet pressure channel (16) from the low-pressure working pressure chamber (17). The diaphragm (67) is acted upon by the inlet pressure and transmits force to the valve piston (26) through the piston shaft (27), providing reliable pressure separation in the compact integrated design. This intermediary mechanism ensures that even in the integrated structure, the critical pressure separation function maintains high reliability
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
The solution enables reliable and efficient reduction of high inlet pressures to usable working pressures, preventing accidental tool activation and extending operating times by minimizing pressure losses, while maintaining a compact and safe design.
Implementation Method 1
a valve spring (29) which acts on the valve piston (26) in the direction of the spring force with its spring force
Implementation Method 2
a compression spring (29) which acts on the valve piston (26) in the direction of the spring force with its spring force
Data Source
Figure 1~4
Figure 5~6
Figure 7
AI summary
The invention relates to a pressure reducing device (10) for pressure-medium-operated work tools, in particular hand tools, with a pressure connection device (12) for connection to an inlet pressure source, a working pressure outlet for connection to the work tool, and a pressure reducing valve (14) for separating an inlet pressure channel (16) from a working pressure chamber (17), wherein the pressure reducing valve has a double-acting valve piston (26) with a working pressure piston surface acted upon by the working pressure against the spring force of a valve spring (29) and a sealing piston surface (28) acted upon by the inlet pressure in the direction of the spring force of the valve spring, which serves to seal the inlet pressure channel against the working pressure chamber, wherein the working pressure chamber is connected via a vent channel (40) to a venting device formed on the pressure connection device, such thatthat a venting piston (44) of the venting device, held in its closed position by a connecting piece (21) of the inlet pressure source, is pressurized with the working pressure.