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December 27, 2019
Refer to different
1. Needle valve: Needle valve is a kind of valve that can be adjusted precisely and belongs to the category of globe valve.
2. Globe valve: The Globe valve, also called a Globe valve, is a compulsory sealed valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface to not leak.
The principle is different
1. Needle valve: The valve core of a needle valve is a very sharp cone, which is inserted into the valve seat like a needle.
2. Stop valve: rely on the pressure of the valve rod to make the sealing surface of the valve disc and the sealing surface of the valve seat closely to prevent the flow of medium. China's valve "three chemical supply" has stipulated that the flow direction of the shut-off valve is always from top to bottom, so there is directionality during installation.
1. Needle valve: used for sealing of gas or liquid medium with small flow and high pressure. Needle valves are most suitable for use with pressure gauges.
2. Stop valve: As one of the most important shut-off valves, the stop valve plays an important role in the aerospace field. As an important component of aerospace equipment, the shut-off valve realizes the functions of media transportation, cut-off, adjustment, etc. Its sealing performance directly affects the safe and reliable operation of aerospace equipment.