Design Simulation and Experiment of Double Spool Pilot Cage Control Valve

doi:10.12141/j.issn.1000-565X.230464

Abstract

Abstract:

Aiming at the problem that the unbalanced force and sealing force under high-temperature and high-pressure conditions are difficult to reach the required leakage level, a double spool pilot cage type control valve was designed, in which a large spool and a small spool work together in sections and the medium pressure in front of the valve is fully utilized to increase the sealing force of the valve seat. Then, the calculation equation of unbalanced force, the flow equation and the flow characteristics of the valve were analyzed, the fluid flow was simulated, and the pressure loss after the fluid flows through the control valve was analyzed. Moreover, the fluid flow in the inner cavity of the large valve spool was simulated, and the pressure before the valve, the temperature in the inner cavity as well as the sealing force was analyzed. The motion simulation of large and small spools was also carried out, and the driving force of the actuator, the axial resultant force of the valve spindle and the speed of the large spool were all discussed. The results of valve body’s pressure-tight test and valve seat’s leakage test of normal-temperature medium show that there is no visible leakage and deformation in the valve body; and that the measured leakages of three tests are respectively 1, 1 and 2 drops per minute when the set leakage is 10 drops per minute. In addition, the results of valve seat’s leakage test of high-temperature medium show that, when the set leakage is 1.275 mL/min, the measured leakages of three tests for 250 ℃ high-temperature steam are respectively 0.11, 0.11 and 0.13 mL/min, while those for 300 ℃ high-temperature steam are respectively 0.19, 0.19 and 0.22 mL/min, finding that all the measured leakages are less than the set ones. The double valve spool pilot cage structure proposed in this paper enhances the sealing force of the regulating valve, and, the pressure strength of the valve body and the sealing performance of the valve seat both meet the use requirements.

Key words: double valve spool, pilot cage type, control valve, design simulation, pressure-tight test, leakage test

CLC Number:

TS737⁺.3

YU Ruiming, WU Yefei, WU Bing, SHEN Yuzhong. Design Simulation and Experiment of Double Spool Pilot Cage Control Valve[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(6): 99-109.

Figures/Tables 26

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Table 1

Flow coefficients corresponding to different relative opening degrees"

相对开度/%	C $v'$	C_v		C $v'$	C_v
5	2.43	4.86	55	17.20	34.39
10	2.96	5.92	60	20.91	41.83
15	3.60	7.19	65	25.43	50.86
20	4.37	8.75	70	30.92	61.85
25	5.32	10.64	75	37.61	75.21
30	6.47	12.93	80	45.73	91.46
35	7.86	15.73	85	55.61	111.22
40	9.56	19.13	90	67.62	135.25
45	11.63	23.26	95	82.23	164.47
50	14.14	28.28	100	100.00	200.00

Table 1

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Table 2

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References 22

1	VISHNU R， REVATHI R ．Methods of isolation of nanocellulose from wood：a review［J］．Journal of Pharmacognosy and Phytochemistry，2019，8（5）：2386-2392.
2	ACCIARDO E， TABASSO S， CRAVOTTO G，et al ．Process intensification strategies for lignin valorization ［J］．Chemical Engineering and Processing-Process Intensification，2022，171：108732/1-15.
3	ASADA C， SASAKI Y， NAKAMURA Y ．Production of eco-refinery pulp from moso bamboo using steam treatment followed by milling treatment［J］．Waste and Biomass Valorization，2020，11（11）：6139-6146.
4	ZHENG C， LIU Y， WANG H，et al ．Finite element analysis and experimental study on the deformation characteristics of an aluminum alloy fracturing ball［J］．Journal of Natural Gas Science and Engineering，2016，35：203-210.
5	BOZHKO G V ．Force analysis for a ball-seating valve with PTFE seal［J］．Chemical and Petroleum Engineering，2000，36（11）：740-748.
6	SOTOODEH K ．A review of valve stem sealing to prevent leakage from the valve and its effect on valve operation［J］．Journal of Failure Analysis and Prevention，2021，21（1）：9-16.
7	ZHU M， ZHAO S， LI J，et al ．Computational fluid dynamics and experimental analysis on flow rate and torques of a servo direct drive rotary control valve［J］．Proceedings of the Institution of Mechanical Engineers，Part C：Journal of Mechanical Engineering Science，2019，233（1）：213-226.
8	ZAHORULKO A V， LEE Y B ．Dynamic behavior and difference pressure control of difference pressure regulator for dry gas seals［J］．Mechanical Systems and Signal Processing，2022，165：108350/1-20.
9	顾成果．套筒调节阀套筒结构的设计与分析［J］．阀门，2010（4）：8-10.
	GU Cheng-guo ．Design and analysis for sleeve structure of the cage control valve［J］．Valve，2010（4）：8-10.
10	王铭升，王春秀．调节阀介质流向对不平衡力的影响［J］．阀门，2014（5）：23-25.
	WANG Ming-sheng， WANG Chun-xiu ．The effect of regulating valve flow direction of medium on the unbalanced force［J］．Valve，2014（5）：23-25.
11	TSAI C C， CHANG C Y， TSENG C H ．Optimal design of metal seated ball valve mechanism［J］．Structural and Multidisciplinary Optimization，2004，26（3）：249-255.
12	WU S J， YANG C J， CHEN Y，et al ．A study of the sealing performance of a new high-pressure cone valve for deep-sea gas-tight water samplers［J］．Journal of Pressure Vessel Technology，2010，132（4）：041601/1-5.
13	张宁，李强，胡康，等．低温调节阀阀座软密封特性研究（I）：常温密封性能［J］．北京理工大学学报，2015，35（5）：441-444.
	ZHANG Ning， LI Qiang， HU Kang，et al ．Soft sealing characteristics of valve seat （I）：sealing characteristics at room temperature［J］．Transactions of Beijing Institute of Technology，2015，35（5）：441-444.
14	康烨．前后压差对调节阀不平衡力的影响［D］．银川：宁夏大学，2014.
15	乐定琪．直通单座调节阀的应用［J］．化工自动化及仪表，1982（5）：55.
	LE Dingqi ．Straight through single seat regulator application［J］．Control and Instruments in Chemical Industry，1982（5）：55.
16	赵安民．智能阀门定位器在气动执行器上的应用［J］．自动化仪表，2007，28（10）：63-64，67.
	ZHAO Anmin ．Application of intelligent valve positioner in pneumatic actuator［J］．Process Automation Instrumentation，2007，28（10）：63-64，67.
17	周杰，曹清媛，王时龙，等．填料密封预紧应力与磨损量和泄漏量的映射模型［J］．重庆大学学报，2019，42（5）：1-9.
	ZHOU Jie， CAO Qingyuan， WANG Shilong，et al ．Mapping model of packing seals preload on wear and leakage［J］．Journal of Chongqing University，2019，42（5）：1-9.
18	LU X K， XIN T Y， ZHANG Q，et al ．Versatile mechanical properties of novel g-SICx monolayers from graphene to silicene：a first-principles study［J］．Nanotechnology，2018，29（31）：315701/1-15.
19	冯子江，鲁斌．伯努利方程在电介质流体中的应用［J］．物理通报，2021，40（10）：33-35.
	FENG Zijiang， LU Bin ．Application on Bernoulli equation in dielectric fluid［J］．Physics Bulletin，2021，40（10）：33-35.
20	LU L， WANG J， LI M，et al ．Experimental and numerical analysis on vortex cavitation morphological characteristics in U-shape notch spool valve and the vortex cavitation coupled choked flow conditions［J］．International Journal of Heat and Mass Transfer，2022，189：122707/1-15.
21	陈修高，张鹏，石洋，等．基于Simerics MP+的核电厂主给水调节阀流量特性数值模拟［J］．西华大学学报（自然科学版），2022，41（2）：101-106.
	CHEN Xiugao， ZHANG Peng， SHI Yang，et al ．Numerical simulation study on flow characteristics of main feed-water valve in nuclear power plant［J］．Journal of Xihua University （Natural Science Edition），2022，41（2）：101-106.
22	TAO J， LIN Z， MA C，et al ．An experimental and numerical study of regulating performance and flow loss in a V-port ball valve［J］．Journal of Fluids Engineering，2020，142（2）：021207/1-9.

参数	设定值
	阀体耐压试验			阀座泄漏量试验
	第1次	第2次	第3次	第1次	第2次	第3次
压力/MPa	2.4	2.4	2.4	1.6	1.6	1.6
保压时间/s	300	360	420	300	360	420
泄漏量/（滴·min^-1）	0	0	0	10	10	10

参数	试验值
	阀体耐压试验			阀座泄漏量试验
	第1次	第2次	第3次	第1次	第2次	第3次
泄漏量/（滴·min^-1）	0	0	0	1	1	2
压降/MPa	0	0	0	0	0	0

参数	设定值
	以250 ℃水蒸气为介质时			以300 ℃水蒸气为介质时
	第1次	第2次	第3次	第1次	第2次	第3次
压力/MPa	0.35	0.35	0.35	0.35	0.35	0.35
保压时间/s	300	360	420	300	360	420
泄漏量/（mL·min^-1）	1.275	1.275	1.275	1.275	1.275	1.275

参数	试验值
	以250 ℃水蒸气为介质时			以300 ℃水蒸气为介质时
	第1次	第2次	第3次	第1次	第2次	第3次
泄漏量/（mL·min^-1）	0.11	0.11	0.13	0.19	0.19	0.22
压降/MPa	0	0	0	0	0	0

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[2]	LIU Xiumei, WU Su, LI Beibei, et al.. Study on 3D Flow Field Characteristics of Control Valve Based on 2D-PIV [J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(11): 110-118.