Pneumatic Actuator Adjustable Stop Devices
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Solution Overview
Problem
Existing pneumatic actuators for valves face issues with precise adjustment of stroke lengths, particularly when the rotation angle between opening and closing positions differs from 90°, leading to uneven stress distribution on the kinematic coupling, affecting precision and durability.
Innovation Solution
A pneumatic actuator design featuring adjustable stop devices with variable distance, where two stop devices are positioned parallel to the piston movement, intercepting the pistons to control their approach stroke, distributing stop forces uniformly onto the actuator body and opposing pistons, thereby protecting the delicate coupling areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stop devices are positioned to interact with the outlet shaft and turning element, then valve opening and closing strokes can be adjusted, but stress and stop forces are released onto the outlet shaft and turning element, affecting precision and duration
Solution Approach 1:
The invention extracts the stop function from the outlet shaft and turning element, relocating it to the piston level. Two stop devices are positioned to interact directly with the two pistons, separating the stopping action from the delicate kinematic coupling components. This extraction prevents stress from being released onto the outlet shaft and turning element, thereby preserving their precision and duration.
2Adaptability or versatility
If adjusting screws are positioned on head flanges to interact with pistons, then opening and closing strokes can be adjusted, but stop forces concentrate on one or the other head flange without spreading stress on the two pistons
Solution Approach 1:
The invention employs an asymmetric arrangement where the two stop devices are positioned at different locations relative to the pistons. One stop device interacts with the first piston while the other interacts with the second piston, creating an asymmetric force distribution that balances the stress across both pistons during operation. This asymmetric positioning ensures that stop forces are properly distributed rather than concentrating on a single head flange.
Data Source
AI summary
The invention concerns pneumatic actuators for valves comprising a body closed by head flanges, two pistons moving in said body in opposite directions, an output shaft that turns actuated by the pistons, and a stop device on each head flange to limit the stroke of the pistons when they move away from each other towards the head flanges. On at least one side of the actuator body an adjusting device (22) is provided which includes stop means (26, 27) at varying distances from each other in a direction parallel to the movement of the pistons and arranged in a position to intercept and limit the stroke of the pistons when the latter move towards each other.