开出口是为了什么? 俺是外行，但直觉上赞成purplelarry 。找到这么个网址 http:///art-gate-valve.htm ，上面对闸阀的wedge描述和分类很是详尽。下面还有这么一段话，是否可以认为当泵运转在接近最大关闭压力时，微开出口阀可有助于该阀接下来的完全开启。 ‘the most common method of opening and closing (actuating) a valve is through a handwheel attached to the yoke or bonnet. this works fine on moderate size valves operating at reasonable pressures, but some severe operating situations call for more muscle. for example, an 18”, class 1500, main steam isolating valve in a power plant operating at 1750 psi and 1000 degrees f. requires a huge amount of torque to open under pressure. the only solution is remote actuation- usually in the form of an electric motor or hydraulic actuator.’查看更多
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