Piloting Device with Parallel Choke and Flow Control Valve
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Solution Overview
Problem
Existing piloting devices using substantially incompressible fluids face challenges in achieving fast and repeatable responses due to variable viscosity and operating conditions, leading to pressure peaks and delays in actuator operation, which can result in early wear and unsatisfactory performance.
Innovation Solution
A device with a two-way flow control valve and a parallel adjustable choke in a bypass duct, where the flow control valve closes at a calibration pressure equal to the actuation pressure, ensuring fast pre-filling and maintaining pressure through a combination of the bypass duct and choke, while a check valve allows discharge to prevent pressure peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a choke is used to attenuate pressure in the piloting line, then pressure stabilization is improved, but response time increases and pressure peaks occur
Solution Approach 1:
The piloting line is segmented into two parallel paths: one with a choke for pressure attenuation and stabilization, and another without a choke for rapid pressure transmission. This segmentation allows the system to simultaneously achieve both fast response and pressure stability by selecting the appropriate path based on operational needs.
Solution Approach 2:
The system dynamically switches between two piloting line configurations using a switching valve. When rapid response is needed, the valve connects the piloted element directly to the main circuit bypassing the choke. When pressure stabilization is needed, the valve routes through the choke. This dynamic switching resolves the contradiction between fast response and pressure stability.
2Stress or pressure
If a choke is used to attenuate pressure, then pressure control is improved, but pressure peaks occur causing early wear
Solution Approach 1:
A switching valve acts as an intermediary between the main circuit and the piloted element. It controls whether fluid flows through the choke (for pressure control) or directly (to avoid pressure peaks). This intermediary allows the system to achieve pressure control when needed while avoiding harmful pressure peaks that cause wear, by selecting the appropriate flow path.
3Speed
If a flow control valve and choke in parallel are used, then pre-filling speed is improved, but pressure peaks occur after valve closure
Solution Approach 1:
The switching valve operates based on feedback from the piloting line pressure. When pressure reaches the desired level, the valve switches positions, transitioning from direct connection (fast pre-filling) to choke-mediated connection (pressure stabilization). This feedback-controlled switching achieves fast pre-filling while preventing pressure peaks that would occur with simple parallel flow control valve and choke configurations.
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 configuration reduces the time to actuate the piloted element, provides a consistent and repeatable response, and prevents pressure peaks, enhancing the durability and reliability of the hydraulic circuit.
Implementation Method 1
The flow control valve is actuated for closing by the pressure at the second port 5, the calibration pressure value pTAR at which such valve closes being at most equal to the actuation pressure value pAZ of the element to be piloted
Implementation Method 2
the signal attenuation efficiency obtained by using a choke is strongly influenced by the viscosity of the fluid that flows through it
Implementation Method 3
A typical application of this type, for example, is the one related to a hydraulic circuit for actuating an actuator for the lifting and lowering of a load... along which there is an overcenter valve for controlling the flow-rate during the discharge step
Implementation Method 4
first elastic compression means 15 which are interposed between the valve body 8 and the second end of the obturator 10, at the ventilated area of the axial seat 9, which act in the direction for spacing the obturator from the annular seat 11
Implementation Method 5
a check valve allows discharge to prevent pressure peaks
Data Source
AI summary
A device (1) for piloting by means of a substantially incompressible fluid, comprising a two-way flow control valve (2) which operates along a piloting line (3) and has at least one first port and one second port (4, 5), which are adapted to be connected, respectively, to means (102) for supplying a substantially incompressible fluid under pressure and to a fluid-operated element (107) to be piloted by means of the piloting line (3) and choke means (6) arranged in parallel to the flow control valve (2) along a bypass duct (7) which is closed in a loop on the piloting line (3), the flow control valve (2) being actuated for closing by the pressure at the second port (5), the calibration pressure value at which the flow control valve (2) closes being at most equal to the actuation pressure value of the element (107) to be piloted.