Design and Analysis of Hydraulic Full-Bridge Network for Water Hydraulic Servo Valve

2011 ◽  
Vol 181-182 ◽  
pp. 377-382
Author(s):  
Xin Hua Wang ◽  
Jian Zheng ◽  
Wei Li ◽  
Shu Wen Sun
Keyword(s):  
Slide Valve ◽  
Static Characteristic ◽  
Pressure Sensitivity ◽  
Characteristic Parameters ◽  
Load Pressure ◽  
Servo Valve ◽  
Annular Gap ◽  
Hydraulic Servo ◽  
Water Hydraulic ◽  
Pressure Characteristics

Annular gap throttle has been used in water hydraulic slide valve which makes the hydraulic full-bridge network of the water hydraulic servo valve different from that of traditional hydraulic servo valve with fixed orifice. Based on liquid resistance theory and hydraulic bridge theory, the load pressure characteristics, pressure sensitivity and static characteristic parameters have been analyzed by the research of hydraulic full-bridge network constituted by annular gap throttle and clearance throttle between flapper and nozzle. The results show that the load pressure characteristics of the hydraulic full-bridge in water hydraulic servo valve keep fine linear relationship with flapper displacement, but the pressure sensitivity decreases in the normal working range of servo valve. However, the pressure sensitivity can achieve a reasonable value by the improvement of hydraulic full-bridge.

Design and Analysis of Slide Valve Used in Water Hydraulic Servo Valve Based on Flow Field Simulation

2010 ◽  
Vol 34-35 ◽  
pp. 1279-1283 ◽  
Author(s):  
Xin Hua Wang ◽  
Jian Zheng ◽  
Wei Li ◽  
Shu Wen Sun
Keyword(s):  
Incidence Angle ◽  
Chemical Properties ◽  
Slide Valve ◽  
Fluid Simulation ◽  
Flow Coefficient ◽  
Design Parameters ◽  
Structure Parameters ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Water Hydraulic

Because of the difference between oil and water in physical and chemical properties, research on the design method of water hydraulic slide valve is important to design the water hydraulic servo valve. Based on the flow fluid simulation of incompressible flow, according to the design parameters of water hydraulic slide valve, CFD software Fluent is used to simulate and analyze the flow characteristics of water hydraulic slide valve. The simulation model of Slide valve with rectangular openings has been built, and different combinations of boundary conditions are specified to make comparisons so as to ensure the correctness of the simulation. The factors which impact the static characteristics of slide valve like the spool opening, flow coefficient, incidence angle have been discussed. The results indicate that the flow designed of the slide valve is approximately proportional to the spool opening by rational selection of structure parameters. The structure parameters of the slide valve that satisfy the design requirements are derived.

Research on Flow Characteristics of Slide Valve Used in Water Hydraulic Servo Valve

2010 ◽  
Vol 29-32 ◽  
pp. 1651-1656 ◽  
Author(s):  
Xin Hua Wang ◽  
Wei Li ◽  
Shu Wen Sun
Keyword(s):  
Flow Characteristics ◽  
Slide Valve ◽  
Structure Parameters ◽  
Important Research ◽  
Boundary Values ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Design Requirements ◽  
Water Hydraulic ◽  
Simulation Results

Water hydraulic servo valve has become an important research subject nowadays, and its secondary amplifier usually uses slide valve. Research on flow characteristics of water hydraulic slide valve is important to the design of water hydraulic servo valve. Based on the classical theory of incompressible flow, CFD software FLUENT is used to simulate and analyze the flow characteristics of water hydraulic slide valve. Simulations with different boundary values are applied to the same slide valve in order to guarantee the accuracy of the simulation results. Detailed comparisons are made between throttles with different structure parameters, including spool diameter, spool opening, flow passage diameter and equalizing slots so as to define the parameters respectively. The results indicate that the flow rate of the slide valve designed is approximately proportional to the spool opening within certain travel. Finally, the structure parameters of the slide valve that satisfy the design requirements are obtained. The simulation results provide theoretical basis for the design and improvement of water hydraulic slide valve used in water hydraulic servo valve.

Development of the Small Flow Rate Water Hydraulic Servo Valve

2010 ◽  
Vol 22 (3) ◽  
pp. 333-340 ◽  
Author(s):  
Toshiya Watanabe ◽  
◽  
Tomokazu Inayama ◽  
Takeo Oomichi
Keyword(s):  
Flow Rate ◽  
Servo Valve ◽  
Test And Evaluation ◽  
Small Flow Rate ◽  
Hydraulic Servo ◽  
Small Flow ◽  
Hydraulic Manipulator ◽  
Water Hydraulic ◽  
Leakage Characteristics ◽  
Small Capacity

A small capacity servo valve was developed for a small size water hydraulic manipulator, focusing the saving energy. The new servo valve optimizes the machines small flow rate use, makes the stroke longer for wideband use, reduces leakage and makes control easier. The test and evaluation of the servo valve was conducted by examining flow rate characteristics, leakage characteristics and responsibility. The flow rate and leak rate of the servo valve shows to be the same as the oil hydraulic servo valve, while the step and frequency response show good controllability for the water hydraulic manipulator.

Improvement of durability of water hydraulic servo valve

2018 ◽  
Vol 2018 (0) ◽  
pp. 2P1-B03
Author(s):  
Koki Sakakibara ◽  
Kazushi Shibata ◽  
Shunya Suzuki ◽  
Satoshi Ashizawa ◽  
Takeo Oomichi
Keyword(s):  
Servo Valve ◽  
Hydraulic Servo ◽  
Water Hydraulic

Theoretical and Simulative Study on Hydraulic Bridge of Water Hydraulic Servo Valve

2011 ◽  
Vol 181-182 ◽  
pp. 305-309 ◽  
Author(s):  
Xin Hua Wang ◽  
Jia Qing Chang ◽  
Shu Wen Sun ◽  
Gang Zheng
Keyword(s):  
Fluid Dynamics ◽  
Steady State ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Servo Valve ◽  
Pressure Distributions ◽  
Hydraulic Servo ◽  
Water Hydraulic ◽  
The Relationship ◽  
Annular Clearance

An analysis has been conducted on the hydraulic bridge of the water hydraulic servo valve with annular clearance between sleeve and spool land as its first hydraulic resistance. Through some formula deductions, the simplified hydraulic bridge is drawn and the relationship between flapper displacement and differential pressure of spool ends, which is demonstrated by the subsequent simulation works, is extracted. By the CFD(computational fluid dynamics) simulation, firstly, the pressure distributions of the flapper face and the fore end face of the nozzle are obtained. Results show that the flapper has an annular area where the existing pressure is negative. Secondly, the relationship between flapper displacement and flow force acting on flapper is also acquired, which is much beneficial to the steady-state and dynamic analysis of the water hydraulic servo valve.

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