| 摘要 |
This flow straight-through valve has a valve element with piston heads at both ends which slide in a cylindrical valve chamber. A transverse opening through the valve element, between the piston heads, is moved into alignment with inlet and outlet passages on opposite sides of the cylindrical valve chamber to open the valve. The transverse opening is of the same cross section as the inlet and outlet passages. The valve element has slabbed-off flat surfaces on the sides that confront the inlet and outlet passages. Moveable seals are resiliently urged toward the flat surfaces, and fluid pressure means, which move the valve element between open and closed positions, cause the seals to move away from the valve element, and thus unseal it, when the fluid pressure is applied to move the valve element.
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