A, flat gate valve flow resistance is small, the advantages of not reducing the flow resistance and short just similar flow resistance. Flat gate Industrial Valves with flow guide hole is installed in the pig can also be directly used on the pipeline pigging. Because ram is sliding on the two seats, flat gate valve fluid can apply to medium with suspended particles, flat gate valve sealing surface is, in fact, the automatic positioning. Seat sealing surface are not subject to the body heat deformation damage. And even if the valve is closed under cold state, thermal elongation also won't make the sealing surface of the stem under overload. At the same time when the valve is closed, without diversion hole flat gate valve and does not require the closing of the gate location is of high accuracy, so the electric flat valve can be used to control the opening and closing position. Second, the shortcomings of flat gate valve when medium pressure is low, metal sealing surface sealing force is not enough to achieve satisfactory sealing. Instead when medium pressure is high, if the sealing surface without lubrication system of medium or foreign media, often can make the sealing surface wear is too large for opening and closing. Another shortage is that the lateral movement of the circular disc on the circular flow only when it is in 50% of the valve position, the Industrial Valves to control the flow of more sensitive. Moreover, ram but in high speed and high density flow medium, can produce violent vibration. If make v-shaped his seat and disc close guidance, it also can be used for throttling. Three, flat gate Industrial Valves selection principle 1. Oil, natural gas pipeline, with single or double ram disc flat gate valve. For cleaning the pipelines, choose single or double ram disc stem flat gate valve with flow guide hole. 2. Product oil pipeline and storage equipment, selects the diversion hole of single or double ram disc flat gate valve. 3. The extraction of oil, natural gas wellhead, choose non-rising stem floating seat of single ram with flow guide hole or double ram plate gate valve, mostly API16A standard, pressure rating for API2000, API3000, API5000, API10000, API15000, API20000. 4. With suspended particles medium pipeline, selects the knife type flat gate valve. 5. City gas pipeline, choose single or double ram disc sealing stem flat gate valve. 6. Urban tap water project, choose single or double ram disc of diversion kongming pole plate gate valve.
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