Experimental Verification of Balanced Control Valve

2016 ◽  
Vol 821 ◽  
pp. 632-640
Author(s):  
Martin Miczán ◽  
Lukáš Bednář ◽  
Michal Hoznedl ◽  
Ladislav Tajč
Keyword(s):  
Experimental Verification ◽  
Control Valve ◽  
Inlet Pressure ◽  
Design Calculation ◽  
Servo Drive ◽  
The Real ◽  
Force Transducers ◽  
Operational Characteristics

Findings are presented from the tests of balanced control valve mounted on the steam piping with experimental turbine. The forces applied on the spindle are recorded and compared to design calculation. The forces are evaluated from the pressures on a servo drive piston or they are measured directly using force transducers. The real operational characteristics are compared with characteristics defined for constant inlet pressure.

Self-Aligning Limited-Angle Rotary Torque PM Motor for Control Valve: Design and Experimental Verification

2020 ◽  
Vol 30 (4) ◽  
pp. 1-5
Author(s):  
Gang-Hyeon Jang ◽  
Sung-Won Seo ◽  
Chang-Woo Kim ◽  
Ick-Jae Yoon ◽  
Jang-Young Choi
Keyword(s):  
Experimental Verification ◽  
Control Valve ◽  
Valve Design ◽  
Limited Angle

scholarly journals Operational characteristics of direct sowing machine-tractor unit

2020 ◽  
Vol 12 (4) ◽  
pp. 331-334
Author(s):  
G. Tihanov
Keyword(s):  
Transportation Mode ◽  
Idle Mode ◽  
Idle State ◽  
The Real ◽  
Operation Speed ◽  
Relative Share ◽  
Operational Characteristics ◽  
Actual Operation ◽  
Sowing Machine ◽  
Direct Sowing

Abstract. A study on some operational characteristics of a direct sowing machine-tractor unit has been carried out in wheat sowing. It is performed by Horsch Avatar 6.16 SD direct seeder aggregated to John Deere 7250 R tractor. It was found that 91% of the area is sown at sowing rate of 195 kg seed/ha. The remaining 9% are sown either at lower or higher rate. Engine rotations of the seed unit have been established at work mode, i.e. when the seeder is sowing, these are 1594.81 min-1, in idle state the rotations are 912.08 min-1, and in transportation mode are 1860.36 min-1. The relative share of engine use has also been determined: when the seeder is sowing, it is 56.68%, when the seeder unit is in idle mode, it is 14.54% and when the unit is in transportation mode – 28.78%, respectively. The actual operation speed of the seeder unit when sowing wheat was 10.40 km/h and the real hourly productivity – 3.7 ha/h.

scholarly journals Forecasting the life of a structure relative to the operating mode

2021 ◽  
Vol 2094 (4) ◽  
pp. 042061
Author(s):  
D A Ogorelkov ◽  
O A Lukashuk
Keyword(s):  
Normal Distribution ◽  
Service Time ◽  
Operating Mode ◽  
Operating Conditions ◽  
Design Calculation ◽  
Metallic Structure ◽  
Load Spectrum ◽  
The Real ◽  
The Law ◽  
High Level

Abstract The question of forecasting the service life of transport machines designed by taking into consideration the load spectrum, that is close to the real one, is an important problem at the calculation. One of the ways to simulate real operating conditions at the design calculation is a method of randomization quasirandom loads. Methods of randomization are widely used in many areas of science and technique. In the article, the numeric comparison of different ways of randomization is shown at the calculation for determining the service time using two techniques: the use of a standardized function of randomization in the high-level programming language of the and the law of normal distribution at its different parameters. The use of the law of normal distribution makes the more exact fatigue calculation because it makes it possible to simulate the quasirandom process that corresponds to the real operation picture to a greater degree. The results presented in the work make it possible to fulfill the calculation of the service time of the metallic structure that is under cyclic asymmetric loads, at the well-known nature of the application of loading to it.

High Precision Synchronous Mechanical Motion Hydraulic Compensation Method

2015 ◽  
Vol 713-715 ◽  
pp. 810-813
Author(s):  
Hong Jun Liu ◽  
Shu Ya Zhi
Keyword(s):  
High Precision ◽  
Hydraulic System ◽  
Control Valve ◽  
Servo Drive ◽  
Mechanical Motion ◽  
Single Cylinder ◽  
Drive Control ◽  
Comparison Circuit ◽  
Valve Control ◽  
Sensor Detection

Auxiliary hydraulic system being based on sensor detection is designed to control two execution parts synchronization precision work in main hydraulic lines. To design a servo drive control valve with three working positions, its each position have an oil inlet and two outlets. This valve can come true compensation flow for the single cylinder or all cylinders of the main lines at the same time. Have designed a device is used to control the auxiliary valve-control compensating device by the grating sensor comparison circuit.

Lifetime of a Control Valve Plug Related With Cavitation Erosion at Differential Pressure of 20 MPA

2002 ◽  
Author(s):  
Satoshi Yuzawa ◽  
Takumi Hashizume ◽  
Ryoji Okutsu ◽  
Eisuke Outa
Keyword(s):  
Kinetic Energy ◽  
Mass Loss ◽  
Control Valve ◽  
Inlet Pressure ◽  
Fourth Power ◽  
Test Duration ◽  
Pressure Reduction ◽  
Flow Energy ◽  
High Kinetic Energy ◽  
Stainless Steel 316

A contoured plug of stainless steel #316 inserted in a low CV valve has been subjected to erosion tests at a pressure reduction of 20MPa. The test duration on a single plug has extended over 300 hours until the shut-off function becomes incomplete. The fundamental flow pattern inside the valve is almost unchanged at the inlet pressure up to 20MPa in a sense that the pressure reduction has been almost completed at the throat formed by the seat-ring and the characteristic surface of the plug head. The kinetic energy of the flow at the throat describes the energy that is dissipated in the valve. Simulated pressure distribution and cavitation pictures obtained at a low inlet pressure condition indicate that the plug seat-joint-taper is the part that suffers impact of the high kinetic energy flow and collapse of the cavitation bubbles. Then this part is specified as the part of the most heavy erosion. In the erosion test, the process of the erosion development shifts from a phase of pit formation to a phase of rooting out the inside at a stage that the mass loss has reached a certain critical level. In the initial phase, the time averaged loss rate is proportional to a power of the dissipated flow energy. In the second stage of rapid growth, the cumulative mass loss increases with fourth power of the working duration. By using values of the exponent and factor obtained at the full opening test, that provides the shortest test periods, mass loss at an arbitrary condition of CV-value and cavitation number is estimated. Then, a procedure to estimate the valve lifetime is suggested based on a criterion that the seat-leakage flow must not exceed the controllable minimum flow of the valve.

Design and Calculation of a Cable Type of Displacement Sensor

2013 ◽  
Vol 475-476 ◽  
pp. 466-469
Author(s):  
Hui Xian Han ◽  
Xiong Hua Guo
Keyword(s):  
Wear Resistance ◽  
Control System ◽  
Experimental Verification ◽  
Measurement Precision ◽  
Displacement Sensor ◽  
Design Calculation ◽  
Position Measurement ◽  
High Measurement ◽  
System Length ◽  
Selection Of

The article firstly introduced the work principle of a cable type of displacement sensor. Then it analyzed that design, calculation and selection of the scroll spring and the rope which was used for the sensor designed. Experimental verification shows: with high measurement precision and good wear resistance, the designed sensor has a good value of research and application. The cable displacement sensor designed can be used in engineering machinery, automatic control system length measurement and position measurement.

scholarly journals Monitoring bulk material pressure on bottom of storage using DEM

2019 ◽  
Vol 9 (1) ◽  
pp. 623-630 ◽  
Author(s):  
David Žurovec ◽  
Jakub Hlosta ◽  
Jan Nečas ◽  
Jiří Zegzulka
Keyword(s):  
Physical Properties ◽  
Experimental Verification ◽  
Load Transfer ◽  
Bulk Material ◽  
Storage Container ◽  
The Real ◽  
Model Situation ◽  
And Storage ◽  
Mathematical Derivation ◽  
Storage Facilities

AbstractThis article focuses on the experimental verification of a mathematical derivation of Janssen’s theory, which describes the distribution of pressures within the bulk material and pressure distribution on the walls of storage facilities. The experimental verification is performed in two ways. The first is the real measurement of the load transfer in a bulk material cylinder and the second is similar to the detection of the load transfer through simulations using the DEM method. The aim is to compare the results of the theoretical calculation according to Janssen’s theory with the real measurement and a simulation of exactly the same model situation. At the beginning of any design or optimisation of existing transport or storage facilities, the most important is the analysis of the bulk material in the form of measurements of mechanical-physical properties. The analysis methods used are also described here. The pressure at the bottom of a storage container between the methods used showed negligible differences. From this finding, it can be concluded that the DEM method is a very suitable means for verifying the design of transport and storage facilities. The simulations provide important information and insights that can also be used to optimise existing transport or storage facilities.

scholarly journals Operational Characterization of Pressure Regulating Valves

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
M. V. Talamini Junior ◽  
A. C. S. de Araujo ◽  
A. P. de Camargo ◽  
E. Saretta ◽  
J. A. Frizzone
Keyword(s):  
Flow Rate ◽  
Data Models ◽  
Inlet Pressure ◽  
Flow Rates ◽  
Outlet Pressure ◽  
Operational Characteristics ◽  
Three Samples ◽  
Center Pivot ◽  
Sloping Terrain

The functionality of pressure regulating valves (PRVs) is important for proper uniformity and efficiency of irrigation during center pivot irrigation, especially when the center pivot operates on sloping terrain. In practice, the regulated pressure at the PRV outlet is slightly influenced by its inlet pressure, the flow rate through it, and hysteresis effects. The objectives of this work were (a) to evaluate operational characteristics of PRVs based on requirements stated by ISO 10522 (1993) and (b) to model the regulated pressure as a function of inlet pressure and flow rate through the valve considering hysteresis. We carried out tests to evaluate regulation uniformity, regulation curve, hysteresis, and the regulated pressure as function of flow rate and inlet pressure. The following three models of PRVs were evaluated: 10 PSI, 15 PSI, and 20 PSI. For each model, three samples were tested under increasing and decreasing conditions of inlet pressure, within the range from 49.03 to 784.53 kPa, with increments of 49.03 kPa. In addition, flow rates were tested within the range of 0 and 4 m3 h−1. From the gathered data, models to predict outlet pressure as a function of inlet pressure and flow rate were fitted.

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