一、閘閥的工作原理與核心優(yōu)勢

1、 The working principle and core advantages of gate valves

閘閥的啟閉件是閘板，通過閥桿帶動閘板升降來實現(xiàn)管道的通斷。當(dāng)閘板完全升起時，介質(zhì)通道暢通無阻，流體阻力出彩??；當(dāng)閘板完全落下時，通道被切斷，密封可靠。與截止閥相比，閘閥的非常大優(yōu)勢在于全開時流阻幾乎為零，非常適合需要頻繁通斷但不需要調(diào)節(jié)流量的場合。

The opening and closing component of a gate valve is the gate plate, which is driven by the valve stem to lift and lower the gate plate to achieve the opening and closing of the pipeline. When the gate is fully raised, the medium channel is unobstructed and the fluid resistance is minimal; When the gate is completely lowered, the channel is cut off and the seal is reliable. Compared with globe valves, the biggest advantage of gate valves is that the flow resistance is almost zero when fully opened, making them particularly suitable for situations that require frequent on-off but do not require flow regulation.

良工閘閥的核心技術(shù)體現(xiàn)在密封結(jié)構(gòu)上。以Z41H-16C系列為例，楔式閘板與閥座形成楔形配合，越關(guān)越緊，密封可靠。密封面材料為不銹鋼，工作溫度可達425℃，適用于空氣、水、蒸汽、煤氣、油品等多種介質(zhì)。良工閘閥的法蘭連接方式確保了安裝的便捷性和密封的可靠性。

The core technology of Lianggong gate valve is reflected in the sealing structure. Taking the Z41H-16C series as an example, the wedge-shaped gate and valve seat form a wedge-shaped fit, which becomes tighter and more reliable when closed. The sealing surface material is stainless steel, with a working temperature of up to 425 ℃, suitable for various media such as air, water, steam, gas, oil, etc. The flange connection method of Lianggong gate valve ensures the convenience of installation and the reliability of sealing.

二、良工閘閥的主流型號與參數(shù)解讀

2、 Interpretation of mainstream models and parameters of Lianggong gate valves

良工閘閥的型號體系有嚴格的規(guī)律可循：

The model system of Lianggong gate valve has strict rules to follow:

Z41H-16C DN50——這是一款法蘭連接（4）、楔式閘閥（1）、密封面堆焊硬質(zhì)合金（H）、公稱壓力1.6MPa（16）、閥體材質(zhì)碳鋼（C）、口徑50mm的經(jīng)典產(chǎn)品。該型號工作溫度≤425℃，適用介質(zhì)涵蓋空氣、水、蒸汽、煤氣、油品等。

Z41H-16C DN50- This is a classic product with flange connection (4), wedge gate valve (1), sealing surface welded with hard alloy (H), nominal pressure of 1.6MPa (16), valve body material of carbon steel (C), and a diameter of 50mm. The working temperature of this model is ≤ 425 ℃, and the applicable media include air, water, steam, gas, oil, etc.

Z45T-25 DN250——暗桿楔式閘閥，公稱壓力2.5MPa，口徑250mm，密封面為銅合金。

Z45T-25 DN250- concealed wedge gate valve, nominal pressure 2.5MPa, diameter 250mm, sealing surface made of copper alloy.

法蘭明桿軟密封閘閥 DN350——大口徑軟密封閘閥，公稱壓力1.6MPa，適用于給排水系統(tǒng)。

Flange rising stem soft seal gate valve DN350- large-diameter soft seal gate valve, nominal pressure 1.6MPa, suitable for water supply and drainage systems.

三、閘閥選型的5個關(guān)鍵參數(shù)

3、 5 key parameters for selecting gate valves

選型閘閥，建議搞清楚以下5個參數(shù)：

When selecting a gate valve, it is necessary to understand the following 5 parameters:

1. 公稱壓力（PN） ——良工閘閥壓力覆蓋PN1.6~16.0MPa。壓力等級決定了閥門的壁厚和強度。

1. Nominal pressure (PN) - Lianggong gate valve pressure covers PN1.6~16.0MPa. The pressure level determines the wall thickness and strength of the valve.

2. 公稱通徑（DN） ——從DN15到DN5000均有覆蓋?？趶皆酱螅瑢﹂y門的制造精度要求越高。

2. Nominal diameter (DN) - covered from DN15 to DN5000. The larger the diameter, the higher the precision requirements for valve manufacturing.

3. 工作溫度 ——良工閘閥溫度范圍從-29℃到550℃。高溫工況需選用耐熱鋼材質(zhì)，低溫工況需選用低溫鋼。

3. Working temperature - The temperature range of Lianggong gate valve is from -29 ℃ to 550 ℃. High temperature conditions require the use of heat-resistant steel materials, while low-temperature conditions require the use of low-temperature steel.

4. 適用介質(zhì) ——水、蒸汽、油品、腐蝕性介質(zhì)等，不同介質(zhì)對密封材料和閥體材質(zhì)有不同要求。

4. Applicable media - water, steam, oil, corrosive media, etc. Different media have different requirements for sealing materials and valve body materials.

5. 連接方式 ——法蘭連接、焊接連接、溝槽連接等。

5. Connection methods - flange connection, welding connection, groove connection, etc.

四、閘閥的安裝與維護要點

4、 Key points for installation and maintenance of gate valves

安裝閘閥時，應(yīng)保證閥桿朝上，便于操作和潤滑。法蘭連接需確保密封墊片對中，螺栓均勻擰緊。長期不操作的閘閥應(yīng)定期進行啟閉操作，防止閘板與閥座卡死。對于高溫工況的閘閥，應(yīng)注意熱膨脹對密封性能的影響。

When installing gate valves, ensure that the valve stem is facing upwards for easy operation and lubrication. The flange connection needs to ensure that the sealing gasket is aligned and the bolts are evenly tightened. Gate valves that are not operated for a long time should be opened and closed regularly to prevent the gate and valve seat from getting stuck. For gate valves operating under high temperature conditions, attention should be paid to the impact of thermal expansion on sealing performance.

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