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Research Papers: Operations, Applications and Components

Theoretical and Experimental Research on a Three-Way Water Hydraulic Pressure Reducing Valve

[+] Author and Article Information
Xiaofeng He

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: hexiaofeng_hust@163.com

Daoxin Zhao

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: zdxwh2012@163.com

Xiao Sun

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: sunxiao_2012@163.com

Bihai Zhu

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: zhu_bihai@163.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 4, 2016; final manuscript received January 13, 2017; published online March 10, 2017. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 139(4), 041601 (Mar 10, 2017) (9 pages) Paper No: PVT-16-1061; doi: 10.1115/1.4035979 History: Received April 04, 2016; Revised January 13, 2017

A three-way water hydraulic pressure reducing valve (PRV) was developed in this paper for a test equipment in laboratory for adapting complex conditions. The designed PRV has a damping chamber with an orifice located at the spring chamber. Two types of throttles and orifice diameter were investigated through dynamic simulation and optimization, and their dimensions were determined and applied to the manufactured valve prototype. The static and dynamic performances of the valve were tested by experiments. At the preset pressure of 5.0 MPa, the outlet pressure variations for the pressure-reducing port and the relief port, are 0.73 MPa and 1.44 MPa, respectively, while the flow variation is up to 18.0 l/min. The experimental rising times and settling times of the PRV under the inlet pressure step for preset pressures of 5.0 MPa are 33.7 ms and 120.2 ms, respectively, and the overshoot is 3.76%. The test results at each preset pressure agree well with the simulation which verifies that the simulation model can be used to predict the dynamic performance of the PRV. The experimental results for the valve under flow step input conclude that it can work stably at small flow state. The research indicates that making the spring chamber a damping chamber by using an orifice is a feasible way to increase the pressure stability and the dynamic performance of the PRV. However, the damping effect of this structure is insufficient at high working pressure.

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References

Figures

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Fig. 1

Schematic diagram of the water hydraulic three-way PRV

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Fig. 2

Throttle structure at the pressure-reducing port and the relief port on the sleeve

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Fig. 3

Schematic diagram of the flow area for a round hole: (a) pressure-reducing throttle and (b) relief throttle

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Fig. 4

Schematic diagram of the flow area for a waist-shaped hole: (a) pressure-reducing throttle and (b) relief throttle

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Fig. 5

Simulation model of the three-way water hydraulic PRV

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Fig. 6

Dynamic simulation curves of the valve with different throttle types and numbers under the inlet pressure step

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Fig. 7

Picture of the test rig: 2—filter, 3—relief valve, 4—pressure sensors, 5—tested valve, 6—throttle valves, and 8—electromagnetic on–off valve

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Fig. 8

Schematic diagram of the experimental system for the three-way PRV: 1—water hydraulic pump, 2—filter, 3—relief valve, 4—pressure sensors, 5—tested valve, 6—throttle valve, 7—flowmeter, and 8—electromagnetic on–off valve

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Fig. 9

Pressure-flow characteristics of the valve prototype

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Fig. 10

Experimental curves of the valve's dynamic characteristic with orifice and without orifice under 12.0 MPa inlet pressure step

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Fig. 11

Experiment curves of the valve's outlet pressure when flowrate changed from rated flow to droplets

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Fig. 12

The damping chamber pressure and spool velocity of the valve by simulation

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