scholarly journals Analysis of Dynamic Characteristics of Water Hydraulic Relief Valve.

2002 ◽  
Vol 33 (7) ◽  
pp. 149-155
Author(s):  
Satoru HAYASHI ◽  
Takayuki NAKANISHI ◽  
Toshiyuki HAYASE ◽  
Atsushi SHIRAI
Keyword(s):  
Dynamic Characteristics ◽  
Relief Valve ◽  
Water Hydraulic

Theoretical and Experimental Analysis of a One-Stage Water Hydraulic Relief Valve With a One-Way Damper

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Xiaohui Luo ◽  
Xiaofeng He ◽  
Shuping Cao ◽  
Xin Ba
Keyword(s):  
Dynamic Characteristics ◽  
Check Valve ◽  
Operating Characteristics ◽  
Damping Force ◽  
Relief Valve ◽  
Pipe System ◽  
One Stage ◽  
Pressure Water ◽  
Water Hydraulic ◽  
The One

According to the function and operating characteristics of water hydraulic relief valves in a high-pressure water pipe system, a novel one-stage relief valve with a one-way damper was designed and analyzed in this study. The one-way damper consists of a damping chamber and a check valve. Moreover, a damping orifice is bored along the axis of the check-valve spool. When the main spool moves to open the valve port, the check valve is fully open, and the damping orifice generates no damping force on the main spool; otherwise, the check valve is completely closed, and the damping orifice produces a damping force on the main spool. Furthermore, based on a mathematical model describing the dynamic characteristics of the relief valve, the effect of the one-way damper on the dynamic characteristics of the relief valve was simulated and analyzed, and certain optimal parameters of the one-way damper were obtained (e.g., the diameter and length of the damping orifice and the initial volume of the damping chamber). Lastly, the experimental results obtained from a prototype of the relief valve, which was manufactured to the optimal dimensions, demonstrated that the pressure overshoot was 7.5%, the response time was 1.43 × 10−2 s, and the transition time was 3.9 × 10−2 s. Thus, the one-way damper could significantly improve the dynamic characteristics of the relief valve.

scholarly journals DYNAMIC CHARACTERISTICS OF LOW-PRESSURE WATER HYDRAULIC SYSTEM

2002 ◽  
Vol 2002 (5-1) ◽  
pp. 161-166
Author(s):  
Yoshihiro Yata ◽  
Takeshi Nakada ◽  
Yasuo Sakurai ◽  
Kazuhiro Tanaka
Keyword(s):  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Low Pressure ◽  
Pressure Water ◽  
Water Hydraulic

scholarly journals Numerical Analysis of the Dynamic Characteristics of a Balanced Piston Type Relief Valve. 2nd Report. Stability of a Relief Valve.

1997 ◽  
Vol 28 (2) ◽  
pp. 239-244
Author(s):  
Satoru HAYASHI ◽  
Yuji IIZUKA ◽  
Ikuro IIMURA ◽  
Toshiyuki HAYASE
Keyword(s):  
Numerical Analysis ◽  
Dynamic Characteristics ◽  
Relief Valve

The static and dynamic characteristics of a pressure relief valve with a proportional solenoid-controlled pilot stage

2002 ◽  
Vol 216 (2) ◽  
pp. 143-156 ◽  
Author(s):  
R Maiti ◽  
R Saha ◽  
J Watton
Keyword(s):  
Mathematical Model ◽  
Dynamic Characteristics ◽  
Dynamic Behaviour ◽  
Practical Experience ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Pressure Relief ◽  
Static And Dynamic Characteristics ◽  
Good Comparison ◽  
The Mathematical Model

The steady state and dynamic characteristics of a two-stage pressure relief valve with proportional solenoid control of the pilot stage is studied theoretically as well as experimentally. The mathematical model is studied within the MATLAB-SIMULINK environment and the non-linearities have been considered via the use of appropriate SIMULINK blocks. The detailed modelling has resulted in a good comparison between simulation and measurement, albeit assumptions had to be made regarding the solenoid dynamic characteristic based upon practical experience. The use of this characteristic combined with additional dynamic terms not previously considered allows new estimations of internal characteristics to be made such as the damping flowrate. The overall dynamic behaviour has been shown to be dominated by the solenoid characteristic relating force to applied voltage.

Investigation on the modeling and dynamic characteristics of a fast-response and large-flow water hydraulic proportional cartridge valve

2020 ◽  
Vol 234 (22) ◽  
pp. 4415-4432
Author(s):  
Mingxing Han ◽  
Yinshui Liu ◽  
Kan Zheng ◽  
Youchun Ding ◽  
Defa Wu
Keyword(s):  
Genetic Algorithm ◽  
Flow Rate ◽  
Dynamic Characteristics ◽  
Fast Response ◽  
Dynamics Simulation ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Flow Capacity ◽  
Water Hydraulic ◽  
Large Flow

In large-power and high-pressure hydraulic systems, the maximum instantaneous flow rate is often several thousand liters per minute. Normal proportional valves are often difficult to meet their requirements for large flow rate and fast response at the same time. And the leakage of hydraulic oil will seriously pollute the environment. Therefore, a novel water hydraulic proportional valve with fast response and high flow capacity is presented for the large transient power hydraulic system in this paper. The valve utilizes a two-stage structure with two 2/2-way water hydraulic proportional valves as the pilot stage and a cartridge poppet valve as the main stage to achieve fast-response and large-flow capacity simultaneously. A detailed and precise nonlinear mathematical model of the valve considering both structural parameters and flow force is developed. A comprehensive performance optimization has been carried out, which can be mainly divided into computational fluid dynamics simulation optimization based on reducing flow force and multi-objective optimization based on genetic algorithm. The effects of double U-grooves' parameters on the flow force (flow-induced loads) have been studied in detail by numerical simulation. Through the grooves geometry optimization, the maximum flow force can be reduced by 10%. Then, the influences of structure parameters on the performance of step response have been studied, and the optimal parameters of the valve have been obtained by multi-objective optimization based on genetic algorithm. The maximum overshoot has been reduced from 15% to 6% (about 60%) and the adjusting time has been reduced from 58 ms to 48 ms. The dynamic characteristics of the valve have been improved effectively. Finally, a test apparatus which has the ability to provide transient large flow is built. The accuracy of simulation model and optimization design method is verified by test results.

Design of water hydraulic relief valve concerning cavitation suppression

2004 ◽  
Vol 2004.42 (0) ◽  
pp. 137-138
Author(s):  
Takuya KOBAYASHI ◽  
Kenji SUZUKI ◽  
Eizo URATA
Keyword(s):  
Relief Valve ◽  
Water Hydraulic

State-of-the-Art Review of Pressure Relief Valve Design, Testing and Modeling

1991 ◽  
Vol 113 (1) ◽  
pp. 46-54 ◽  
Author(s):  
P. M. Petherick ◽  
A. M. Birk
Keyword(s):  
Dynamic Characteristics ◽  
Nuclear Power ◽  
Literature Search ◽  
Failure Modes ◽  
State Of The Art ◽  
Experimental Studies ◽  
Pressure Relief Valve ◽  
Operating Characteristics ◽  
Relief Valve ◽  
Pressure Relief

It is well known that the response of a rail tank car to exterior heating (e.g., fire engulfment) is significantly affected by the operating characteristics of the pressure relief valve (PRV). If the valve jams or fails in some way, it can lead to a violent vessel rupture; therefore, PRV failure modes and mechanisms must be understood. This paper investigates the studies which have been conducted in the area of PRV technology. The original focus of the paper was to conduct a literature search to find the state-of-the-art for the PRV’s which are presently installed on railway tank cars, highway tankers, and stationary LPG storage vessels. When few papers were found which had concentrated on this particular topic, the authors continued the search by considering both the nuclear power and chemical processing industries, where similar technologies are found. The results of the literature search suggest that the PRV’s currently installed on tank cars and highway tankers are based on designs more than 30 yr old. Controlled fire tests and industry’s maintenance programs suggest that PRV’s could be improved. Most experimental studies of PRV’s have concentrated on flow visualization techniques and have not considered PRV dynamic characteristics. The lack of understanding of valve dynamic characteristics has slowed the development of improved PRV dynamic computer models.

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