支架支设时，活柱升起托住顶梁，利用升柱工具使支柱对顶板产生主动的支撑力。反映了支架对顶板的主动力，这个主动力即为初撑力，取决于支护装备和支设质量。初撑力主要防止顶板早期下沉，防止顶板离层，提高支护系统的早期刚度和整体刚度，提高支柱支护过程中的支护阻力。初撑力对采场支护是极为重要的。
System theory of CCFC type setting guaranteed valve was introduced,whose defect was indicated. And then the paper put forward DCF-PZ200/40 type setting guaranteed operating valve which could availably make the pressure of leg piston cavity achieve rating setting load.
介绍了CCFC型初撑自保阀的系统原理,指出了其不足之处,提出了用DCF-PZ200/40型初撑操纵阀可以有效地使立柱活塞腔内液体压力达到额定初撑力。
参考来源 - 液压支架初撑力保证液压阀的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
对该类支架的工作阻力、初撑力、支护高度等主要参数进行了分析计算。
The main parameters of the hydraulic support, such as working resistance, setting load and support height are analyzed.
留巷断面选择最优跨高比并采用以高初撑力为核心的高强支护体系，能够合理控制围岩变形。
The optimal cross-height ratio and the high strength supporting system with the core of high pre-stress could be helpful to control the deformation of surrounding rock reasonably.
本文对该类支架的工作阻力、初撑力、支护高度等主要参数进行了分析计算，并对其主要结构进行了设计。
The main parameters of the hydraulic support, such as working resistance, setting load and support height, are analyzed and its main structures are design.
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