Results 1 to 10 of about 167,931,681 (292)

Analysis of the jet pipe electro-hydraulic servo valve with finite element methods

MATEC Web of Conferences, 2018
The dynamic characteristics analysis about the jet pipe electro-hydraulic servo valve based on experience and mathematical derivation was difficult and not so precise.
Kaiyu Zhao, Qingxun Wu, Lijian Zhang, Zhaohui Yuan, jiaqiang Yang   +4 more
doaj   +1 more source

Prior balloon valvuloplasty versus DIRECT transcatheter Aortic Valve Implantation (DIRECTAVI): study protocol for a randomized controlled trial

Trials, 2017
Background Balloon predilatation of the aortic valve has been regarded as an essential step during the transcatheter aortic valve implantation (TAVI) procedure.
Florence Leclercq, Pierre Robert, Jessica Labour, Benoit Lattuca, Mariama Akodad, Jean-Christophe Macia, Richard Gervasoni, Francois Roubille, Thomas Gandet, Laurent Schmutz, Erika Nogue, Nicolas Nagot, Bernard Albat, Guillaume Cayla   +13 more
doaj   +1 more source

Evaluation of a new bi-valve vaginal speculum applicator design for gynecologic interstitial brachytherapy

Journal of Contemporary Brachytherapy, 2020
Hiroaki Kunogi, Nanae Yamaguchi, Keisuke Sasai   +2 more
doaj   +1 more source

Fluid Loss Isolation Valve Design and Sealing Performance Study

Shiyou jixie, 2016
In the operation of multistage fracturing,well completion,production and workover,leakage is often encountered and leads to formation damage due to the failure of tool.To address the issue,the high-pressure fluid-loss isolation valve has been developed ...
Chen Shengshan, Wang Hanxiang, Li Qiang, Pang Bin, Yang Shengrong, Liu Yanxin, Zhang Xin   +6 more
doaj  

The Optimization Design of Variable Valve Parameters for Internal Combustion Engines Considering the Energy Consumption of a Composite Electromagnetic Valve Mechanism

Actuators
The variable valve mechanism, as a critical component for the efficient and low-carbon development of internal combustion engines, faces increasingly stringent requirements regarding its driving efficiency, output force, precision, and energy consumption.
Xinyu Fan, Juyi Han, Jie Yin, Li Zheng, Wei Shao   +4 more
doaj   +1 more source

Development of a High-Performance Choke Valve with Reference to Sizing for Multiphase Flow

Measurement + Control, 1991
The paper describes events leading up to the development of a variable choke valve for high-pressure drop service on multiphase fluids. During the evolvement of the design, which has now been proved in service, it was found necessary to discard some of ...
E W Singleton
doaj   +1 more source

Development and Application of Self-locking Fracturing Circulating Valve

Shiyou jixie, 2015
The low opening pressure of the existing fracturing circulating valve in Zhongyuan Oilfield often lead to premature opening due to imbalanced tubing and casing pressure,pressure impulse and misoperation,thereby result in delayed schedule and rework.To ...
Xu Xinhua, Yu Ziqian, Liu Rentian, Peng Jiandong, Zhang Bo   +4 more
doaj  

Simulation-based modeling of aortic valve neocuspidization with oversized pericardial leafletsCentral MessagePerspective

JTCVS Open
Objective: Aortic valve replacement in children is challenging. The lack of accommodation for somatic growth negatively impacts long-term outcomes. Data on the use of symmetrical oversized leaflets in neocuspidization are limited.
Jalal Cherkaoui, MEng, Ines A. Martínez, MD, Yassine Toufique, PhD, James D. St Louis, MD, Mohammed Cherkaoui, PhD, Ignacio Lugones, MD, PhD   +5 more
doaj   +1 more source

Design of a New Type of Electromagnetic Valve Driver for Hydraulic Support

Gong-kuang zidonghua, 2011
In view of problems of single function and no information collection function existed in traditional electromagnetic valve driver of hydraulic support electro-hydraulic control system , the paper put forward a design scheme of a new type of ...
CHEN Zhuo, HE Jia-jian, WU Qing, XU Biao, RONG Liang, LI Peng, GONG Fu-zhang   +6 more
doaj  

Innovation and Challenges in Materials for Transcatheter Aortic Valves. [PDF]

J Cardiovasc Transl Res
Dorishetty P, Carlton A, Neethling L, Valente F.   +3 more
europepmc   +1 more source