NUMERICAL SIMULATION ON THE DYNAMIC CHARACTERISTICS OF A TWO-STAGE WATER HYDRAULIC RELIEF VALVE

2006 ◽  
Vol 42 (01) ◽  
pp. 75 ◽  
Author(s):  
Xiaofeng HE
Keyword(s):  
Numerical Simulation ◽  
Dynamic Characteristics ◽  
Relief Valve ◽  
Two Stage ◽  
Water Hydraulic

Static and Dynamic Characteristics of a Two Stage Pilot Relief Valve

1991 ◽  
Vol 113 (2) ◽  
pp. 280-288 ◽  
Author(s):  
Yung C. Shin
Keyword(s):  
Sensitivity Analysis ◽  
Computer Simulation ◽  
Dynamic Characteristics ◽  
Dynamic Equations ◽  
Governing Equations ◽  
Relief Valve ◽  
Two Stage ◽  
Static And Dynamic Characteristics ◽  
Response Characteristics ◽  
Simulation Results

Static and dynamic characteristics of a two stage relief valve have been studied theoretically and experimentally. The governing equations of the valve have been derived and sensitivity analysis was performed by digital computer simulation on the valve response characteristics based on the established dynamic equations of the motions of the valve. From this study, significant parameters on the valve response were identified, which can be modified to improve the dynamic characteristics of the valve. Subsequently, experiments were performed with a specially fabricated Vickers type pilot relief valve. The results showed fair agreement with the simulation results, thus proving the validity of the model.

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

scholarly journals Research on the water hydraulic pressure relief valve

2021 ◽  
Author(s):  
Franc Majdič
Keyword(s):  
Environmental Sustainability ◽  
Maximum Flow ◽  
Pressure Relief Valve ◽  
Hydraulic Pressure ◽  
Relief Valve ◽  
Two Stage ◽  
Pressure Relief ◽  
Water Hydraulics ◽  
Water Hydraulic ◽  
Cfd Analyses

Water hydraulics is increasingly becoming a viable alternative to oil hydraulics due to its environmental sustainability. The leakage of water hydraulic components is one of the reasons why water hydraulics is not more widely used. One of the missing water hydraulic components is also the two- stage pressure relief valve. Various valve designs have been investigated. FEM and CFD analyses of the relief valve were performed. Some prototypes were made and tested in the pressure range of 50 to 200 bar at a maximum flow rate of 30 lpm. The functional characteristics of the valve were studied, and the influence of each component was determined. It was found that the manufacture of a two-stage water valve is technologically feasible with appropriate design adjustments.

scholarly journals NUMERICAL SIMULATION OF WATER HYDRAULIC RELIEF VALVE

1999 ◽  
Vol 1999 (4) ◽  
pp. 555-560 ◽  
Author(s):  
Takayuki NAKANISHI ◽  
Satoru HAYASHI ◽  
Toshiyuki HAYASE ◽  
Atsushi SHIRAI ◽  
Masao JOTATSU ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
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 Study on System Design and Integration of Variable Buoyancy Systems for Underwater Operation

2021 ◽  
Vol 71 (1) ◽  
pp. 124-133
Author(s):  
B. K. Tiwari ◽  
R. Sharma
Keyword(s):  
Numerical Simulation ◽  
Energy Consumption ◽  
System Design ◽  
Underwater Vehicles ◽  
Medium Size ◽  
Depth Control ◽  
Water Hydraulic ◽  
Simulation Results

This paper presents the design and analysis of the ‘Variable Buoyancy System (VBS)’ for depth control which is an essential operation for all underwater vehicles. We use the ‘Water Hydraulic Variable Buoyancy System (WHVBS)’ method to control the buoyancy and discuss details of the system design architecture of various components of VBS. The buoyancy capacity of the developed VBS is five kilograms and the performance of the VBS in standalone mode is analysed using numerical simulation. Presented VBS is operable to control the buoyancy up to sixty meters of depth and it can be directly installed to medium size UVs. Simulation results show that the developed VBS can reduce the energy consumption significantly and higher in each cycle (i.e. descending and ascending) of the same VBS in standalone mode being operated with either propeller or thruster for sixty meters depth of operation. Our results conclude and demonstrate that the designed VBS is effective in changing the buoyancy and controlling the heave velocity efficiently and this serves the purpose of higher endurance and better performances desired in rescue/attack operations related to the UVs both in civilian and defense domains.

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