果冻久久尤物

J13, J23-type instrument needle valve

Instrument needle valve is an important part of the instrument measuring pipeline system, there are cut-off valve and ball valve, mainly used for opening or cutting off the pipeline access. Installation points: the valve must be installed before the appearance of inspection, the valve nameplate should be consistent with the current national standard "General Valve Logo" GB 12220 requirements. Instrument needle valve body surface is also subject to atmospheric corrosion, the general steel materials are to paint to protect.

1 Introduction Instrument editing instrument needle valve is an important part of the instrument measuring pipe system, there are cut-off valve and ball valve, its function is to open or cut off the pipeline access. It is a kind of advanced connection way in the power station, oil refining, chemical equipment and instrument measuring pipeline. It has the advantages of easy installation and disassembly, fastening and connecting, which is good for fireproof, explosion proof and pressure resistance, good sealing performance. Of the valve. Needle-shaped valve sealing a good, long life, even if the sealing surface damage, they only need to replace the vulnerable parts, you can continue to use.

2-pin valve anti-corrosion method Edit the first anti-corrosion of the valve body, mainly the right choice of materials. Although the anti-corrosion information is very rich, but can choose the right, or not easy, because the corrosion problem is very complex. The difficulty of selecting the material body, but also can not only consider the corrosion problem, must also consider the ability of pressure and temperature, whether the economy is reasonable, easy to buy and other factors.

Followed by the lining measures, such as lined with lead, aluminum lining, lining engineering plastics, natural rubber lining and a variety of synthetic rubber. Such as media conditions permit, this is a saving method.

Again, the pressure, the temperature is not high, the use of non-metallic valve body material, can often be very effective in preventing corrosion. In addition, the needle valve body surface is also subject to atmospheric corrosion, the general steel materials are to paint to protect.

Needle valve works

According to the different spool, can be divided into cut-off valve, gate valve, plug valve, ball valve, butterfly valve, needle valve, etc. The needle valve spool is a very sharp cone , As if the needle into the valve seat, hence the name.

Needle-type valve than other types of valves can withstand greater pressure, good sealing performance, it is generally used for smaller flow, higher pressure gas or liquid medium seal. Needle valve with the pressure gauge is used in conjunction with the The most appropriate of the general needle valve are made of threaded connections. Nominal pressure: PN2.5 PN4 PN6.4 PN16 PN32Mpa Nominal diameter: DN5 ~ DN25 Applicable medium: oil, water, gas and other non-corrosive or corrosive medium Applicable temperature: -20 ℃ ~ + 440 ℃ -70 ℃ ~ -240 ℃ ≤ 540 ℃ ≤ 570 ℃ and other manufacturing materials: 20 # ﹑ 1Cr18Ni9Ti ﹑ 304,316 ﹑ 316L ﹑ 12Cr1Mov, etc.