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原文：
Ball valves are essentially a spherical “ball” with a hole through the centre. This ball is squeezed between two seats by a ball retainer. When the ball is turned so that the hole is in line with the ports fluid is allowed to flow. To stop this flow the ball is turned 90° to block the flow. This is when the problems can occur, turning the valve on or off. Ball valves are designed to be shut off at low flow with almost no pressure drop across the ball - that is equal pressure each side. When a ball valve is shut off with a high flow rate, the velocity of the fluid across the seats increases until the valve is completely closed. This is caused by the velocity of the fluid Safety Relief Valves across the diminishing orifice. This high velocity if experienced for a long time, e.g. metering the flow, will erode the seats. The seats used in ball valves are a delrin material – a hard wearing compound commonly used as a seal. Some fluids affect the seal more than others – water based fluids such as solcenic hydraulic fluids are very abrasive and will erode ball valve seats very quickly. If a single ball valve is used there is a high chance Instrumentation Ball Valves that at some time during its life it has experienced seat erosion. This is alright if you verify your isolation – but what if the job takes a long time and the seats are only leaking a small amount. This small amount will still pressurise the system to an unsafe state. The only safe solution is to use a Double Block and Regulators Double Bleed system where there are two ball valves to isolate the system and two Bleeds to verify both isolation ball valves are working – only then is a ball valve suitable for high pressure
原文来自： http://www.miningaustralia.com.au/Article/Ball-valves-in-hydraulic-isolation-applications/507213.aspx

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译文：
自定义液压已发布了一篇文章，概述球阀是否应液压隔离应用。有球阀门适合隔离？在我们回答这个问题，让我们来看看一球阀作品，他们的目的是做。球阀基本上是一个球形“球以期通过该中心的黑洞”。这个球是挤压两个座位，一球保持器。当球处于开启状态，以便在该洞与港口液体线允许流动。为了制止这种球是90 °转向以阻止流流。这是当可能会发生问题，把阀门打开或关闭。球阀的设计被关闭时，几乎没有上球压降的低流量过 - 这是双方平等的压力。当球阀关闭高的流量起飞，横跨席位流体的速度增加，直到完全关闭阀门。这是由横跨了流体的速度递减口。如此高的速度，如果经历了很长一段时间，例如：计量流量，会削弱我们的席位。在球阀使用的座位是聚甲醛树脂材料 - 1耐磨复合俗称印章使用。一些流体密封的影响比其他 - 水的基础上，如solcenic液压油液体非常粗糙，损害球阀席位非常快。如果一个球阀有使用的机会很高，在其生命过程中的一些有经验的座位侵蚀的时间。这不要紧，如果您确认自己的孤立 - 但如果工作需要很长的时间，座位只有少量泄漏。这少量仍然加压系统不安全的状态。唯一安全的解决方案是采用双块和双排气系统有两条球阀孤立系统和两个出血，去检查隔离球阀的工作 - 只有这样，一个球阀适用于高压