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Instrument valve is a kind of pipeline accessory

2020-11-20 09:49:41
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Instrument valve is a kind of pipeline accessory
Instrument valve is a kind of pipeline accessory. It is used to change the channel section and medium flow direction, and control the medium flow. The sealing performance of instrument valve refers to the ability of the sealing parts of instrument valve to prevent medium leakage, which is an important technical performance index of instrument valve. There are three sealing parts of the instrument valve: the contact between the opening and closing parts and the two sealing surfaces of the valve seat; The matching place of packing, valve stem and stuffing box; The joint between valve body and valve cover. One of the previous leakage is called internal leakage, which is usually said to be not closed tightly, it will affect the ability of instrument valve to cut off the medium. For block valves, internal leakage is not allowed. The leakage of the latter two places is called external leakage, that is, the medium leaks from the inside of the valve to the outside of the valve. Leakage will cause material loss, pollute the environment, and even cause accidents. For flammable, explosive, toxic or radioactive media, leakage is not allowed, so the instrument valve must have reliable sealing performance.
Instrument valve is a kind of pipeline accessory. It is used to change the channel section and medium flow direction, and control the medium flow. Specifically, instrument valves have the following uses:
(1) Connect or cut off the medium in the pipeline. Such as gate valve, globe valve, ball valve, plug valve, diaphragm valve, butterfly valve, etc.
(2) Adjust and control the flow and pressure of medium in pipeline. Such as throttle valve, control valve, pressure reducing valve, safety valve, etc.
(3) Change the direction of medium flow in the pipeline. Such as distribution valve, three-way cock, three-way or four-way ball valve.
(4) Prevent the medium in the pipeline from flowing back. Such as check valve, bottom valve, etc.
(5) Separation medium. Such as a variety of different structures of steam trap, air trap, etc.
(6) Indicate and adjust the liquid level. Such as liquid level indicator, liquid level regulator, etc.
(7) Other special uses. Such as temperature control valve, over-current protection emergency shut-off valve, etc.

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