疏水閥在蒸汽加熱系統中起到阻汽排水作用，選擇合適的疏水閥，可使蒸汽加熱設備達到最高工作效率。要想達到最理想的效果，就要對各種類型疏水閥的工作性能、特點進行全面的了解。

　　The steam trap plays a role in blocking steam and draining water in the steam heating system. Choosing a suitable steam trap can achieve the highest working efficiency of the steam heating equipment. To achieve the most ideal effect, it is necessary to have a comprehensive understanding of the working performance and characteristics of various types of drain valves.

　　疏水閥的品種很多，各有不同的性能。選用疏水閥時，首先應選其特性能滿足蒸汽加熱設備的最佳運行，然后才考慮其他客觀條件，這樣選擇你所需要的疏水閥才是正確和有效的。

　　There are many types of drain valves, each with different performance. When selecting a steam trap, the first thing to consider is its characteristics that can meet the optimal operation of steam heating equipment, and then other objective conditions should be taken into account. Only in this way can you choose the steam trap you need correctly and effectively.

　　疏水閥要能“識別”蒸汽和凝結水，才能起到阻汽排水作用。“識別” 蒸汽和凝結水基于三個原理：密度差、溫度差和相變。于是就根據三個原理制造出三種類型的疏水閥，分類為機械型、熱靜力型、熱動力型。

　　A drain valve must be able to "identify" steam and condensate in order to effectively block steam and drain water. The identification of steam and condensate is based on three principles: density difference, temperature difference, and phase transition. So three types of steam traps were manufactured based on three principles, classified as mechanical, thermo static, and thermo dynamic types.

　　一.機械型疏水閥

　　One Mechanical drain valve

　　機械型也稱浮子型，是利用凝結水與蒸汽的密度差，通過凝結水液位變化，使浮子升降帶動閥瓣開啟或關閉，達到阻汽排水目的。機械型疏水閥的過冷度小，不受工作壓力和溫度變化的影響，有水即排，加熱設備里不存水，能使加熱設備達到最佳換熱效率。最大背壓率為80%，工作質量高，是生產工藝加熱設備最理想的疏水閥。

　　Mechanical type, also known as float type, utilizes the density difference between condensed water and steam to adjust the liquid level of condensed water, causing the float to rise and fall and drive the valve disc to open or close, achieving the purpose of blocking steam and draining water. Mechanical drain valves have low undercooling and are not affected by changes in working pressure and temperature. Water is discharged as soon as it is available, and there is no water stored in the heating equipment, which can achieve optimal heat transfer efficiency. The maximum back pressure rate is 80%, with high working quality, making it the most ideal drain valve for heating equipment in production processes.

　　機械型疏水閥有自由浮球式、自由半浮球式、杠桿浮球式、倒吊桶式等。

　　Mechanical drain valves include free floating ball type, free semi floating ball type, lever floating ball type, inverted bucket type, etc.

　　1.自由浮球式疏水閥：

　　1. Free floating ball drain valve:

　　自由浮球式疏水閥的結構簡單，內部只有一個活動部件精細研磨的不銹鋼空心浮球，既是浮子又是啟閉件，無易損零件，使用壽命很長，“銀球”牌疏水閥內部帶有Y系列自動排空氣裝置，非常靈敏，能自動排空氣，工作質量高。

　　The structure of the free floating ball type drain valve is simple, with only a finely ground stainless steel hollow floating ball as a moving part inside. It is both a float and an opening and closing part, with no vulnerable parts and a long service life. The "Silver Ball" brand drain valve has a Y series automatic air exhaust device inside, which is very sensitive and can automatically exhaust air, with high working quality.

　　設備剛啟動工作時，管道內的空氣經過Y系列自動排空氣裝置排出，低溫凝結水進入疏水閥內，凝結水的液位上升，浮球上升，閥門開啟，凝結水迅速排出，蒸汽很快進入設備，設備迅速升溫，Y系列自動排空氣裝置的感溫液體膨脹，自動排空氣裝置關閉。疏水閥開始正常工作，浮球隨凝結水液位升降，阻汽排水。自由浮球式疏水閥的閥座總處于液位以下，形成水封，無蒸汽泄漏，節能效果好。最小工作壓力0.01Mpa，從0.01Mpa至最高使用壓力范圍之內不受溫度和工作壓力波動的影響，連續排水。能排飽和溫度凝結水，最小過冷度為0℃，加熱設備里不存水，能使加熱設備達到最佳換熱效率。背壓率大于85%，是生產工藝加熱設備最理想的疏水閥之一。

　　When the equipment starts working, the air in the pipeline is discharged through the Y series automatic air exhaust device. Low temperature condensed water enters the drain valve, the liquid level of condensed water rises, the float rises, the valve opens, and the condensed water is quickly discharged. Steam quickly enters the equipment, and the equipment quickly heats up. The temperature sensing liquid of the Y series automatic air exhaust device expands, and the automatic air exhaust device closes. The drain valve starts working normally, and the float rises and falls with the level of condensed water, blocking steam and draining water. The valve seat of the free floating ball drain valve is always below the liquid level, forming a water seal with no steam leakage and good energy-saving effect. The minimum working pressure is 0.01Mpa, and it is not affected by temperature and working pressure fluctuations within the range of 0.01Mpa to the maximum operating pressure, with continuous drainage. It can discharge saturated temperature condensed water, with a minimum subcooling of 0 ℃, and there is no water in the heating equipment, which can achieve the best heat transfer efficiency of the heating equipment. The back pressure rate is greater than 85%, making it one of the most ideal drain valves for heating equipment in production processes.

　　2.自由半浮球式疏水閥：

　　2. Free semi floating ball drain valve:

　　自由半浮球式疏水閥只有一個半浮球式的球桶為活動部件，開口朝下，球桶即是啟閉件，又是密封件。整個球面都可為密封，使用壽命很長，能抗水擊，沒有易損件，無故障，經久耐用，無蒸汽泄漏。背壓率大于80%，能排飽和溫度凝結水，最小過冷度為0℃，加熱設備里不存水，能使加熱設備達到最佳換熱效率。

　　The free semi floating ball type drain valve only has one semi floating ball type ball bucket as the moving part, with the opening facing downwards. The ball bucket is both the opening and closing member and the sealing member. The entire spherical surface can be sealed, with a long service life, resistance to water hammer, no vulnerable parts, no faults, durability, and no steam leakage. The back pressure rate is greater than 80%, capable of discharging saturated temperature condensed water, with a minimum subcooling degree of 0 ℃. There is no water in the heating equipment, which can achieve the best heat transfer efficiency of the heating equipment.

　　當裝置剛啟動時，管道內的空氣和低溫凝結水經過發射管進入疏水閥內，閥內的雙金屬片排空元件把球桶彈開，閥門開啟，空氣和低溫凝結水迅速排出。當蒸汽進入球桶內，球桶產生向上浮力，同時閥內的溫度升高，雙金屬片排空元件收縮，球桶漂向閥口，閥門關閉。當球桶內的蒸汽變成凝結水，球桶失去浮力往下沉，閥門開啟，凝結水迅速排出。當蒸汽再進入球桶之內，閥門再關閉，間斷和連續工作。

　　When the device is just started, the air and low-temperature condensed water in the pipeline enter the drain valve through the launch tube. The bimetallic plate emptying element in the valve opens the ball barrel, and the valve opens, quickly discharging the air and low-temperature condensed water. When steam enters the drum, the drum generates upward buoyancy, and at the same time, the temperature inside the valve increases. The bimetallic strip emptying element contracts, and the drum floats towards the valve port, causing the valve to close. When the steam inside the bucket turns into condensed water, the bucket loses its buoyancy and sinks downwards. The valve opens and the condensed water is quickly discharged. When steam enters the drum again, the valve closes again, and it works intermittently and continuously.

　　3. 杠桿浮球式疏水閥：

　　3. Leverage floating ball drain valve:

　　杠桿浮球式疏水閥基本特點與自由浮球式相同，內部結構是浮球連接杠桿帶動閥芯，隨凝結水的液位升降進行開關閥門。杠桿浮球式疏水閥利用雙閥座增加凝結水排量，可達到體積小排量大，最大疏水量達100噸/小時，是大型加熱設備最理想的疏水閥。

　　The basic characteristics of the lever float type drain valve are the same as those of the free float type. The internal structure is that the float is connected to the lever to drive the valve core, and the valve is opened and closed with the rise and fall of the condensate level. The lever floating ball drain valve uses dual valve seats to increase the condensate flow rate, achieving small volume and large flow rate, with a maximum drainage capacity of 100 tons/hour, making it the most ideal drain valve for large heating equipment.

　　4. 倒吊桶式疏水閥：

　　4. Inverted bucket drain valve:

　　倒吊桶式疏水閥內部是一個倒吊桶為液位敏感件，吊桶開口向下，倒吊桶連接杠桿帶動閥芯開閉閥門。倒吊桶式疏水閥能排空氣，不怕水擊，抗污性能好。過冷度小，漏汽率小于3%，最大背壓率為75%，連接件比較多，靈敏度不如自由浮球式疏水閥。因倒吊桶式疏水閥是靠蒸汽向上浮力關閉閥門，工作壓差小于0.1MPA時，不適合選用。

　　The inside of the inverted bucket drain valve is a liquid level sensitive component. The opening of the bucket is downward, and the connecting lever of the inverted bucket drives the valve core to open and close the valve. The inverted bucket type drain valve can discharge air, is not afraid of water hammer, and has good anti pollution performance. The subcooling degree is small, the steam leakage rate is less than 3%, the maximum back pressure rate is 75%, there are more connections, and the sensitivity is not as good as that of a free floating ball drain valve. Due to the fact that the inverted bucket drain valve relies on steam buoyancy to close the valve, it is not suitable for use when the working pressure difference is less than 0.1MPA.

　　當裝置剛啟動時，管道內的空氣和低溫凝結水進入疏水閥內，倒吊桶靠自身重量下墜，倒吊桶連接杠桿帶動閥芯開啟閥門，空氣和低溫凝結水迅速排出。當蒸汽進入倒吊桶內，倒吊桶的蒸汽產生向上浮力，倒吊桶上升連接杠桿帶動閥芯關閉閥門。倒吊桶上開有一小孔，當一部份蒸汽從小孔排出，另一部份蒸汽產生凝結水，倒吊桶失去浮力，靠自身重量向下沉，倒吊桶連接杠桿帶動閥芯開啟閥門，循環工作，間斷排水。

　　When the device is just started, the air and low-temperature condensed water in the pipeline enter the drain valve, and the inverted bucket falls by its own weight. The connecting lever of the inverted bucket drives the valve core to open the valve, and the air and low-temperature condensed water are quickly discharged. When steam enters the inverted bucket, the steam in the bucket generates upward buoyancy, and the upward connecting lever of the inverted bucket drives the valve core to close the valve. There is a small hole on the inverted bucket. When a part of the steam is discharged from the small hole and another part of the steam produces condensed water, the inverted bucket loses buoyancy and sinks downwards by its own weight. The connecting lever of the inverted bucket drives the valve core to open the valve, which works in a cyclic manner and intermittently discharges water.

　　5. 組合式過熱蒸汽疏水閥：

　　5. Combination superheated steam trap:

　　組合式過熱蒸汽疏水閥有兩個隔離的閥腔，由兩根不銹鋼管連通上下閥腔，它是由浮球式和倒吊桶式疏水閥的組合，該閥結構先進合理，在過熱、高壓、小負荷的工作狀況下，能夠及時地排放過熱蒸汽消失時形成的凝結水，有效地阻止過熱蒸汽泄漏，工作質量高。最高允許溫度為600℃，閥體為全不銹鋼，閥座為硬質合金鋼，使用壽命長，是過熱蒸汽專用疏水閥，取得兩項國家專利，填補了國內空白。

　　The combined superheated steam drain valve has two isolated valve chambers connected by two stainless steel pipes. It is a combination of floating ball and inverted bucket drain valves. The valve structure is advanced and reasonable. Under the working conditions of overheating, high pressure, and low load, it can timely discharge the condensed water formed when the hot steam disappears, effectively preventing the leakage of superheated steam and ensuring high working quality. The maximum allowable temperature is 600 ℃, the valve body is made of all stainless steel, and the valve seat is made of hard alloy steel. It has a long service life and is a specialized steam trap for superheated steam. It has obtained two national patents, filling the domestic gap.

　　當凝結水進入下閥腔，副閥的浮球隨液位上升，浮球封閉進汽管孔。凝結水經進水導管上升到主閥腔，倒吊桶靠自重下墜，帶動閥芯打開主閥門，排放凝結水。當副閥腔的凝結水液位下降時，浮球隨液位下降，副閥打開。蒸汽從進汽管進入上主閥腔內的倒吊桶里，倒吊桶產生向上的浮力，倒吊桶帶動閥芯關閉主閥門。當副閥腔的凝結水液位再升高時，下一個循環周期又開始，間斷排水。

　　When condensed water enters the lower valve chamber, the float of the auxiliary valve rises with the liquid level, and the float seals the inlet pipe hole. The condensed water rises to the main valve chamber through the inlet pipe, and the inverted bucket falls by its own weight, driving the valve core to open the main valve and discharge the condensed water. When the condensate level in the auxiliary valve chamber drops, the float ball follows the decrease in level and the auxiliary valve opens. Steam enters the inverted bucket in the upper main valve chamber through the inlet pipe, and the inverted bucket generates upward buoyancy, which drives the valve core to close the main valve. When the condensate level in the auxiliary valve chamber rises again, the next cycle begins with intermittent drainage.

　　二.熱靜力型疏水閥

　　II Thermal static type drain valve

　　這類疏水閥是利用蒸汽和凝結水的溫差引起感溫元件的變形或膨脹帶動閥芯啟閉閥門。熱靜力型疏水閥的過冷度比較大，一般過冷度為15度到40度，它能利用凝結水中的一部分顯熱，閥前始終存有高溫凝結水，無蒸汽泄漏，節能效果顯著。是在蒸汽管道，伴熱管線、小型加熱設備，采暖設備，溫度要求不高的小型加熱設備上，最理想的疏水閥 。

　　This type of drain valve utilizes the temperature difference between steam and condensed water to cause deformation or expansion of the temperature sensing element, which drives the valve core to open and close the valve. The thermal static type drain valve has a relatively high degree of supercooling, generally ranging from 15 degrees to 40 degrees. It can utilize a portion of the sensible heat in the condensed water, and there is always high-temperature condensed water in front of the valve without steam leakage, resulting in significant energy-saving effects. It is the most ideal drain valve for steam pipelines, heat tracing pipelines, small heating equipment, heating equipment, and small heating equipment with low temperature requirements.

　　熱靜力型疏水閥有膜盒式、波紋管式、雙金屬片式等。

　　Thermal static type drain valves include membrane type, corrugated tube type, bimetallic plate type, etc.

　　1. 膜盒式疏水閥：

　　1. Diaphragm type drain valve:

　　膜盒式疏水閥的主要動作元件是金屬膜盒，膜盒內充有一種汽化溫度比水的飽和溫度低的液體,有開閥溫度低于飽和溫度15℃和30℃兩種可供選擇。膜盒式疏水閥的反應特別靈敏，不怕凍，體積小，耐過熱，任意位置都可安裝。背壓率大于80%，能排不凝結氣體，膜盒堅固，使用壽命長，維修方便，使用范圍很廣。

　　The main operating component of the membrane type drain valve is the metal membrane box, which is filled with a liquid with a vaporization temperature lower than the saturation temperature of water. There are two options for opening the valve: 15 ℃ and 30 ℃ below the saturation temperature. The response of the membrane type drain valve is particularly sensitive, not afraid of freezing, small in size, heat-resistant, and can be installed at any position. The back pressure rate is greater than 80%, it can discharge non condensable gases, the membrane box is sturdy, has a long service life, is easy to maintain, and has a wide range of applications.

　　裝置剛啟動時，管道出現低溫冷凝水，膜盒內的液體處于冷凝狀態，閥門處于開啟位置。當冷凝水溫度漸漸升高，膜盒內充液開始蒸發，膜盒內壓力上升，膜片帶動閥芯向關閉方向移動，在冷凝水達到飽和溫度之前，疏水閥開始關閉。膜盒隨蒸汽溫度變化控制閥門開關，起到阻汽排水作用。

　　When the device was just started, low-temperature condensed water appeared in the pipeline, and the liquid in the membrane box was in a condensed state, with the valve in the open position. As the temperature of the condensed water gradually increases, the liquid inside the membrane box begins to evaporate, the pressure inside the membrane box rises, and the membrane drives the valve core to move in the closing direction. Before the condensed water reaches saturation temperature, the drain valve begins to close. The membrane box controls the valve opening and closing with changes in steam temperature, playing a role in blocking steam and draining water.

　　2. 波紋管式疏水閥：

　　2. Bellows type drain valve:

　　波紋管式疏水閥的閥芯不銹鋼波紋管內充一種汽化溫度低于水飽和溫度的液體。隨蒸汽溫度變化控制閥門開關，該閥設有調整螺栓，可根據需要調節使用溫度，一般過冷度調整范圍低于飽和溫度15℃-40℃。背壓率大于70%，不怕凍，體積小，任意位置都可安裝，能排不凝結氣體，使用壽命長。

　　The valve core of the bellows type drain valve is filled with a liquid with a vaporization temperature lower than the saturation temperature of water inside the stainless steel bellows. Control the valve switch with changes in steam temperature. The valve is equipped with adjustment bolts that can adjust the operating temperature as needed. Generally, the undercooling adjustment range is 15 ℃ -40 ℃ below the saturation temperature. Back pressure rate greater than 70%, not afraid of freezing, small size, can be installed at any position, can discharge non condensable gases, and has a long service life.

　　當裝置啟動時，管道出現冷卻凝結水，波紋管內液體處于冷凝狀態，閥芯在彈簧的彈力下，處于開啟位置。當冷凝水溫度漸漸升高，波紋管內充液開始蒸發膨脹，內壓增高，變形伸長，帶動閥芯向關閉方向移動，在冷凝水達到飽和溫度之前，疏水閥開始關閉，隨蒸汽溫度變化控制閥門開關，阻汽排水。

　　When the device is started, cooling condensate appears in the pipeline, and the liquid inside the corrugated pipe is in a condensed state. The valve core is in the open position under the elastic force of the spring. As the temperature of the condensed water gradually increases, the liquid inside the corrugated tube begins to evaporate and expand, causing an increase in internal pressure, deformation, and elongation, which drives the valve core to move in the closing direction. Before the condensed water reaches saturation temperature, the drain valve begins to close, and the valve switch is controlled according to the change in steam temperature to block steam and drain water.

　　3. 雙金屬片式疏水閥：

　　3. Bimetallic plate drain valve:

　　雙金屬片疏水閥的主要部件是雙金屬片感溫元件，隨蒸汽溫度升降受熱變形，推動閥芯開關閥門。雙金屬片式疏水閥設有調整螺栓，可根據需要調節使用溫度，一般過冷度調整范圍低于飽和溫度15℃-30℃，背壓率大于70%，能排不凝結氣體，不怕凍，體積小，能抗水擊，耐高壓，任意位置都可安裝。雙金屬片有疲勞性，需要經常調整。

　　The main component of a bimetallic drain valve is the bimetallic temperature sensing element, which deforms due to the rise and fall of steam temperature and drives the valve core to open and close the valve. The bimetallic strip drain valve is equipped with adjustment bolts, which can adjust the operating temperature according to needs. Generally, the undercooling adjustment range is below the saturation temperature by 15 ℃ -30 ℃, and the back pressure rate is greater than 70%. It can discharge non condensable gases, is not afraid of freezing, has a small volume, can resist water hammer, high pressure, and can be installed at any position. Bimetallic sheets have fatigue and require frequent adjustment.

　　當裝置剛啟動時，管道出現低溫冷凝水，雙金屬片是平展的，閥芯在彈簧的彈力下，閥門處于開啟位置。當冷凝水溫度漸漸升高，雙金屬片感溫起元件開始彎曲變形，并把閥芯推向關閉位置。在冷凝水達到飽和溫度之前，疏水閥開始關閉。雙金屬片隨蒸汽溫度變化控制閥門開關，阻汽排水。

　　When the device is just started, low-temperature condensed water appears in the pipeline. The bimetallic strip is flat, and the valve core is in the open position under the elastic force of the spring. As the temperature of the condensed water gradually increases, the bimetallic sensing element begins to bend and deform, pushing the valve core towards the closed position. Before the condensate reaches saturation temperature, the drain valve begins to close. The bimetallic strip controls the valve opening and closing according to the temperature changes of steam, blocking steam and draining water.

　　三.熱動力型疏水閥

　　III Thermal power type drain valve

　　這類疏水閥根據相變原理，靠蒸汽和凝結水通過時的流速和體積變化的不同熱力學原理，使閥片上下產生不同壓差，驅動閥片開關閥門。因熱動力式疏水閥的工作動力來源于蒸汽，所以蒸汽浪費比較大。結構簡單、耐水擊、最大背為50%，有噪音，閥片工作頻繁，使用壽命短。

　　This type of drain valve, based on the principle of phase change, relies on the different thermodynamic principles of the flow rate and volume changes of steam and condensed water passing through, causing different pressure differences between the upper and lower valve plates to drive the valve plate to open and close. Due to the fact that the working power of the thermal power drain valve comes from steam, steam waste is relatively large. Simple structure, shock resistant, maximum back of 50%, noisy, frequent valve operation, short service life.

　　熱動力型疏水閥有熱動力式（圓盤式）、脈沖式、孔板式等。

　　Thermal power type drain valves include thermal power type (disc type), pulse type, orifice plate type, etc.

　　1. 熱動力式疏水閥：

　　1. Thermal power drain valve:

　　熱動力式疏水閥內有一個活動閥片，既是敏感件又是動作執行件。根據蒸汽和凝結水通過時的流速和體積變化的不同熱力學原理，使閥片上下產生不同壓差，驅動閥片開關閥門。漏汽率3%，過冷度為8℃-15℃。

　　There is a movable valve plate inside the thermal power drain valve, which is both a sensitive component and an actuating component. According to the different thermodynamic principles of the flow rate and volume changes of steam and condensed water passing through, different pressure differences are generated above and below the valve plate to drive the valve plate to open and close the valve. The steam leakage rate is 3%, and the subcooling degree is 8 ℃ -15 ℃.

　　當裝置啟動時，管道出現冷卻凝結水，凝結水靠工作壓力推開閥片，迅速排放。當凝結水排放完畢，蒸汽隨后排放，因蒸汽比凝結水的體積和流速大，使閥片上下產生壓差，閥片在蒸汽流速的吸力下迅速關閉。當閥片關閉時，閥片受到兩面壓力，閥片下面的受力面積小于上面的受力面積，因疏水閥汽室里面的壓力來源于蒸汽壓力，所以閥片上面受力大于下面，閥片緊緊關閉。當疏水閥汽室里面的蒸汽降溫成凝結水，汽室里面的壓力消失。凝結水靠工作壓力推開閥片，凝結水又繼續排放,循環工作，間斷排水。

　　When the device is started, cooling condensate appears in the pipeline, and the condensate is quickly discharged by pushing open the valve plate under working pressure. When the condensed water is discharged, the steam is then discharged. Due to the larger volume and flow rate of steam compared to condensed water, a pressure difference is generated between the upper and lower parts of the valve plate, and the valve plate quickly closes under the suction of the steam flow rate. When the valve plate is closed, it is subjected to pressure from both sides, and the force area below the valve plate is smaller than the force area above it. Because the pressure inside the steam chamber of the drain valve comes from steam pressure, the force on the top of the valve plate is greater than that below it, and the valve plate is tightly closed. When the steam in the steam trap chamber cools down into condensed water, the pressure inside the chamber disappears. The condensate is pushed open by the working pressure, and the condensate continues to be discharged, circulating and intermittently draining.

　　2. 圓盤式蒸汽保溫型疏水閥：

　　2. Disc type steam insulated drain valve:

　　圓盤式蒸汽保溫型疏水閥的工作原理和熱動力式疏水閥相同，它在熱動力式疏水閥的汽室外面增加一層外殼。外殼內室和蒸汽管道相通，利用管道自身蒸汽對疏水閥的主汽室進行保溫。使主汽室的溫度不易降溫，保持汽壓，疏水閥緊緊關閉。當管線產生凝結水，疏水閥外殼降溫，疏水閥開始排水；在過熱蒸汽管線上如果沒有凝結水產生，疏水閥不會開啟，工作質量高。閥體為合金鋼，閥芯為硬質合金，該閥最高允許溫度為550℃，經久耐用，使用壽命長，是高壓、高溫過熱蒸汽專用疏水閥。

　　The working principle of the disc type steam insulated drain valve is the same as that of the thermal power drain valve, which adds a layer of shell outside the steam chamber of the thermal power drain valve. The inner chamber of the shell is connected to the steam pipeline, and the main steam chamber of the drain valve is insulated using the pipeline's own steam. Make it difficult for the temperature of the main steam chamber to cool down, maintain steam pressure, and tightly close the drain valve. When condensation occurs in the pipeline, the shell of the drain valve cools down and the drain valve begins to drain water; If there is no condensed water generated on the superheated steam pipeline, the drain valve will not open, and the working quality is high. The valve body is made of alloy steel, and the valve core is made of hard alloy. The maximum allowable temperature of this valve is 550 ℃, which is durable and has a long service life. It is a special drain valve for high-pressure and high-temperature superheated steam.

　　3. 脈沖式疏水閥：

　　3. Pulse type drain valve:

　　脈沖式疏水閥有兩個孔板根據蒸汽壓降變化調節閥門開關，即使閥門完全關閉入口和出口也是通過第一、第二個小孔相通，始終處于不完全關閉狀態，蒸汽不斷溢出，漏汽量大。該疏水閥動作頻率很高，磨損厲害、壽命較短。體積小、耐水擊，能排出空氣和飽和溫度水，接近連續排水，最大背壓25%，因此使用者很少。

　　The pulse type drain valve has two orifice plates that adjust the valve opening and closing according to changes in steam pressure drop. Even if the valve is completely closed, the inlet and outlet are connected through the first and second small holes, always in an incomplete closed state, causing steam to continuously overflow and a large amount of steam leakage. This drain valve has a high operating frequency, severe wear, and a short lifespan. Small size, shock resistant, capable of discharging air and saturated temperature water, close to continuous drainage, with a maximum back pressure of 25%, therefore few users.

　　4. 孔板式疏水閥：

　　4. Orifice type drain valve:

　　孔板式疏水閥是根據不同的排水量，選擇不同孔徑的孔板，達到控制排水量的目的。結構簡單，選擇不合適會出現排水不及或大量跑汽，不適用于間歇生產的用汽設備或冷凝水量波動大的用汽設備。

　　The orifice plate drain valve selects orifice plates with different diameters according to different drainage volumes to achieve the purpose of controlling drainage volume. The structure is simple, and improper selection may result in insufficient drainage or a large amount of steam leakage. It is not suitable for intermittent production steam equipment or steam equipment with large fluctuations in condensate water volume.

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