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Research Papers: Design and Analysis

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

[+] Author and Article Information
Xin Ba

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
Wuhan, Hubei 430074, China

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 29, 2012; final manuscript received July 31, 2013; published online October 10, 2013. Assoc. Editor: Samir Ziada.

J. Pressure Vessel Technol 135(6), 061210 (Oct 10, 2013) (6 pages) Paper No: PVT-12-1180; doi: 10.1115/1.4025204 History: Received November 29, 2012; Revised July 31, 2013

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.

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Figures

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Fig. 1

Working principle of one-stage water hydraulic relief valve

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Fig. 2

Dynamic curves ps − t of relief valve with one-way damper and two-way damper

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Fig. 3

Speed of main spool with one-way damper and two-way damper

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Fig. 4

Dynamic curves ps − t with different diameters of the damping orifice

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Fig. 5

Dynamic curves ps − t with different lengths of the damping orifice

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Fig. 6

Dynamic curves ps − t with different initial volumes of damping chamber

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Fig. 7

Dynamic curve ps − t with optimal structure dimensions

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Fig. 8

Photograph of one-stage water hydraulic relief valve: (a) testing site for the dynamic characteristic of relief valve, (b) principle of the dynamic characteristic testing system

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Fig. 9

Dynamic characteristic testing system for the relief valve

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Fig. 10

Trial curves ps − t for dynamic characteristic of the relief valve: (a) d0 = 4 × 10−4 m, l0 = 8 × 10−3 m, Vc0 = 2 × 10−6 m3; (b) l0 = 8 × 10−3 m, Vc0 = 2 × 10−6 m3, with one-way damper; (c) d0 = 4 × 10−4 m, Vc0 = 2 × 10−6 m3, with one-way damper; (d) d0 = 4 × 10−4 m, l0 = 8 × 10−3 m, with one-way damper

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