The full open position in straight pattern globe valves has higher differential pressure (pressure losses) than an oblique pattern valve.
与倾斜式结构相比，直线式结构截止阀在全开位置具有更高的压差(压力损失)。
Objective To investigate the effects of inferior oblique muscles weakening on V pattern esotropia.
目的探讨下斜肌减弱术对内斜视V征治疗效果。
Methods Pre- and post-operative eye position, superior oblique muscle function, clinical features and binocular function were examined and analyzed in 32 patients with A-pattern exotropia.
方法对32例外斜视A征患者行上斜肌减弱术、内直肌缩短术或（和）外直肌后退术，观察手术前、后患者眼位、斜视度数和临床特征的改变。
The etiology of V pattern deviation are vertical muscle dysfunction, including the primary inferior oblique muscle overreaction 28 (58%), congenital superior oblique muscle paralysis 20 (42%).
引起V型斜视的常见原因为斜肌功能异常，包括原发性下斜肌功能亢进28例（58％），先天性上斜肌麻痹20例（42％）。
Results 11 cases a pattern strabismus got satisfying effect. A pattern disappeared, the superior oblique overaction disappeared as well.
结果11例a型斜视的上斜肌功能亢进均取得明显改善，无1例过矫。
Results 11 cases a pattern strabismus got satisfying effect. A pattern disappeared, the superior oblique overaction disappeared as well.
结果11例a型斜视的上斜肌功能亢进均取得明显改善，无1例过矫。
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