The Guide to Instrument Valves

Instrument Valve Introduction:

Instrument valve is an attachment on the pipeline, usually a micro-control device, as the media off or change the media flow. Main types of instrument valves are: needle valve, needle valve, needle gate valve, micro-solenoid valve. In order to meet the factory live, many manufacturers are developing instrument valve new features in recent years. These mainly focus on multi-pass, pressure regulation, flow regulation, zero leakage, and confluence diversion direction to make substantial improvements.


Instrument Valve Application:

The main function of the instrument valve is throttling, on-off, flow regulation, pressure regulation, confluence, diversion, sampling, and changing the direction of medium flow. Instrument valves are mostly made of stainless steel and its connection include: fast installment, internal and external thread, ferrule, welding. The diameter is from DN1 to DN20 mm, temperature ranges from -20.2 to 1076. Pressure endures from PN0.1 to 100mpa and the main material is A105, 304, 316, 316L. It is applicable for water, oil, gas, steam, liquid and other non-corrosive media.


Instrument Valve Sealing Performance:

Instrument valve sealing performance refers to the ability to prevent media leakage in the sealing parts. There are three valve seal parts: Hoist and valve seat sealing surface between the two contact surfaces; The junction of stem and packing; Valve body and bonnet connection. The leakage in seat sealing surface of an Instrument valve is called internal leakage. It will affect the instrument valve to cut off the medium. For cut-off valves, internal leakage is not allowed. Leakage of filler and bonnet is called external leakage, that is, the medium leaks from the valve to the outside of the valve. External leakage will result in media loss, polluting the environment, and even causing serious accidents. For flammable, toxic or radioactive media, the leakage is obviously unacceptable. Therefore, instrument valve must have a reliable sealing performance.


Instrument Valve Anti-corrosion Method:

Stainless steel should be selected as the main material when the media are corrosive or the environment is corrosive. Although the anti-corrosion material is very diverse, the choice of valve material is difficult, and can not only consider the issue of corrosion, but also to consider the pressure and temperature tolerance, and economically reasonable.

In serious corrosive situations, instrumentation valves should take lining measures, such as lining lead, lined with aluminum, lined with plastic, lined with natural rubber and a variety of synthetic rubber.

Using instrumentation valves when both pressure and temperature are not high, it is suitable to select non-metallic valve as the main material which is often very effective in the prevention of corrosion.

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