Air conditioning system valves can generally be divided into three categories: closed valve, regulating valve and fire release valve.

密閉閥：起開關(guān)作用，要求全開時阻力小，全閉時密閉性能好。如：新風(fēng)密閉閥和排風(fēng)密閉閥。

Closed valve: it plays the role of opening and closing. It is required that the resistance is small when it is fully opened and the sealing performance is good when it is fully closed. Such as: fresh air sealing valve and exhaust air sealing valve.

調(diào)節(jié)閥：在系統(tǒng)中主要起運(yùn)行調(diào)節(jié)作用，常常安裝在系統(tǒng)的送回風(fēng)管路上。按照執(zhí)行特點，又可以分為經(jīng)常調(diào)節(jié)閥和一次性調(diào)節(jié)閥兩種。經(jīng)常調(diào)節(jié)閥常見的有對開多葉閥和平行多葉閥等；一次性調(diào)節(jié)閥主要為系統(tǒng)及各個分支各管段達(dá)到設(shè)計風(fēng)量進(jìn)行調(diào)節(jié)使用的，此種閥門主要起增加阻力作用，并且調(diào)節(jié)前后閥門的位置一般比變動。

Regulating valve: it mainly plays the role of operation regulation in the system and is often installed on the supply and return air pipeline of the system. According to the implementation characteristics, it can be divided into two types: regular control valve and one-time control valve. The common regulating valves are split multi leaf valve and parallel multi leaf valve; The one-time regulating valve is mainly used for regulating the system and each branch and pipe section to reach the design air volume. This valve is mainly used to increase the resistance, and the position of the valve before and after the regulation is generally changed.

常用的一次性調(diào)節(jié)閥門主要有：蝶閥——安裝在較小風(fēng)管的送回風(fēng)支管上；三通調(diào)節(jié)閥——主要用于調(diào)節(jié)兩個支管的風(fēng)量比例，常安裝在回風(fēng)管路和排風(fēng)管路上面；多葉閥(平行型和對開型)；插板閥等

The commonly used one-time regulating valves mainly include: butterfly valve - installed on the supply and return air branch pipe of the smaller air pipe; Three way regulating valve - mainly used to regulate the air volume ratio of the two branch pipes, often installed on the return air pipeline and exhaust air pipeline; Multi leaf valve (parallel type and split type); Insert plate valve, etc

防火閥：在發(fā)生火災(zāi)時自動關(guān)閉，以切斷風(fēng)管通路。原理是利用閥板本身的重量進(jìn)行關(guān)閉的，閥板一般成偏心，重的一端用鋼絲拉起，鋼絲上安裝易熔合金片，保持閥門的開啟，當(dāng)風(fēng)管氣流溫度超過設(shè)定溫度時，合金片熔斷，閥門自動關(guān)閉。同時，放火閥可連接信號報警裝置，及時進(jìn)行報警。

Fire damper: automatically close in case of fire to cut off the air duct passage. The principle is to use the weight of the valve plate itself to close. The valve plate is generally eccentric. The heavy end is pulled up with steel wire, and the fusible alloy sheet is installed on the steel wire to keep the valve open. When the air flow temperature of the air duct exceeds the set temperature, the alloy sheet will fuse and the valve will close automatically. At the same time, the fire valve can be connected with the signal alarm device to give an alarm in time.

除此之外，空調(diào)系統(tǒng)閥門按用途和作用還可以分為截斷閥類和調(diào)節(jié)閥類。

In addition, air conditioning system valves can be divided into block valves and regulating valves according to their uses and functions.

截斷閥類：主要用于截斷或接通介質(zhì)流.包括閘閥、截止閥、隔膜閥、球閥、旋塞閥、碟閥、柱塞閥、球塞閥、儀表針形閥等。

Block valves: mainly used to block or connect the medium flow Including gate valve, globe valve, diaphragm valve, ball valve, plug valve, butterfly valve, plunger valve, ball plug valve, instrument needle valve, etc.

調(diào)節(jié)閥類：主要用于調(diào)節(jié)介質(zhì)的流量、壓力等.包括調(diào)節(jié)閥、節(jié)流閥、減壓閥等。

Regulating valves: mainly used to regulate the flow and pressure of medium, including regulating valves, throttle valves, pressure reducing valves, etc.

止回閥類：用于阻止介質(zhì)倒流.包括各種結(jié)構(gòu)的止回閥。

Check valves: used to prevent the backflow of medium, including check valves of various structures.

分流閥類：用于分離、分配或混合介質(zhì).包括各種結(jié)構(gòu)的分配閥和疏水閥等。

Diverter valves: used for separating, distributing or mixing media, including distribution valves and drain valves of various structures.

安全閥類：用于介質(zhì)超壓時的安全保護(hù).包括各種類型的安全閥。

Safety valves: used for safety protection in case of medium overpressure, including various types of safety valves.

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