| 摘要 |
A valve for controlling a flow of abrasive particles suspended in a pressurized carrier fluid has at least two apertured valve seats ( 74, 75 ) in face to face contact. One of the valve seats ( 74, 75 ) may be slid between a first position in which the apertures of each valve seat ( 74, 75 ) are aligned to allow fluid flow and a second position in which the aperture is one valve seat ( 74, 75 ) is blocked by the face of another ( 75, 74 ) to stop flow through the valve. The valve seats ( 74, 75 ) each have an outer layer of material with a hardness on the Mohs scale of at least 9, such as diamond. The valve is suitable for use in a fluid jet machining apparatus, particularly apparatus charged with a suspension of abrasive particles such as garnet in water.
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