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    斯派莎克波纹管截止阀（SpiraxSarco）是指用在管道上的截止阀，他的启闭件在于阀体于发辫之间、通过旋转发干带动发辫上生或下降来控制管道上的介质、蒸汽截止阀管路中主要用来做切断、分配和改变蒸汽的流动方向。切断管道上的介质或调节介质流量以及节流用。 进口截止阀的阀杆开启或关闭行程相对较短，而且具有非常可靠的切断功能，又由于阀座通口的变化与阀瓣的行程成正比例关系，非常适合于对蒸汽流量的调节。 
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Gate valves

Gate valves are probably the most common valves in use today due to their widespread use in domestic water systems, but it should be noted that their popularity in industry has declined in recent years. However, they are still used where an uninterrupted flow is required, because the gate fully retracts into the bonnet, creating a minimal pressure drop, when the valve is in an open position. Gate valves are specifically intended for use in isolation applications.

A gate valve consists of four main components, the body, bonnet （or cover）, gate and stem. A typical gate valve is shown in Figure 12.1.1.