Digital simulator for hydraulic control systems by personal computer. (4th report Simulation of pipeline systems connected with a control valve and load)

1987 ◽  
Vol 53 (490) ◽  
pp. 1218-1222
Author(s):  
Takayoshi MUTO ◽  
Tadasi KAWAMOTO ◽  
Tsukasa TOYOOKA ◽  
Yoshikazu SUEMATSU
Keyword(s):  
Control Systems ◽  
Personal Computer ◽  
Control Valve ◽  
Hydraulic Control ◽  
Pipeline Systems

Analysis of Unsteady Flow Characteristics in Spool Valves for Mobile Hydraulics Machine Control

2018 ◽  
Author(s):  
S.-J. Oo ◽  
G. Kim ◽  
J. Do ◽  
S. Lee
Keyword(s):  
Control Systems ◽  
Discharge Coefficient ◽  
Flow Characteristics ◽  
Control Valve ◽  
Hydraulic Control ◽  
Transient Pressure ◽  
Servo Valve ◽  
Spool Valves ◽  
Opening And Closing ◽  
Spool Valve

The main control valve is a key part of mobile hydraulic control systems. The main control valve consists of several types of spool valves. A notch is usually introduced to the end of the spool valve to reduce the influence of the flow force generated by the movement of fluid. In this study the flowrate from a spool valve combined with a servo-valve system is controlled based on an accurate prediction of transient pressure-flow relations by CFD. The transient analyses inside the spool valves with three typical types of notch are performed using a commercial CFD code of Fluent™. The flow characteristics such as flow pattern, discharge coefficient, and flow force, which depend on the notch shapes and their openings, are analyzed via vorticity distributions. Hysteresis of flow coefficients is observed for opening and closing motions of the spool valve, which should be compensated by the servo-valve in order to control the designed rate change of flowrate.

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

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