| 摘要 |
A high pressure sluice knife gate valve, comprised of two identical body halves, which does not require a bonnet, but carries the features of a bonnet. This type of construction provides a number of advantages not found on prior art gate valves: (1) Because a bonnet is not needed, the use of a seal around the blade is eliminated, since the body itself contains the pressure. (2) The design minimizes the axial dimension of the chest cavity, thereby reducing stresses in the body. The body is, therefore, light weight and compact. (3) Depending on its size, this type of valve construction can be used for applications where fluid pressure is 300 PSIG and higher. (4) The liner in the valve is comprised of two identical halves. In addition to guiding, seating and wiping the blade, the liner also performs two other important functions: (a) Seals the components attached to the valve, including pipe flanges and valve actuating devices. (b) Guarantees separation of the fluid from the valve body in both the open and closed positions.
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