一、闸阀的工作原理与核心优势

1、 The working principle and core advantages of gate valves

闸阀的启闭件是闸板，通过阀杆带动闸板升降来实现管道的通断。当闸板完全升起时，介质通道畅通无阻，流体阻力出彩小；当闸板完全落下时，通道被切断，密封可靠。与截止阀相比，闸阀的非常大优势在于全开时流阻几乎为零，非常适合需要频繁通断但不需要调节流量的场合。

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.

良工闸阀的核心技术体现在密封结构上。以Z41H-16C系列为例，楔式闸板与阀座形成楔形配合，越关越紧，密封可靠。密封面材料为不锈钢，工作温度可达425℃，适用于空气、水、蒸汽、煤气、油品等多种介质。良工闸阀的法兰连接方式确保了安装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、良工闸阀的主流型号与参数解读

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

良工闸阀的型号体系有严格的规律可循：

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

Z41H-16C DN50——这是一款法兰连接（4）、楔式闸阀（1）、密封面堆焊硬质合金（H）、公称压力1.6MPa（16）、阀体材质碳钢（C）、口径50mm的经典产品。该型号工作温度≤425℃，适用介质涵盖空气、水、蒸汽、煤气、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——暗杆楔式闸阀，公称压力2.5MPa，口径250mm，密封面为铜合金。

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

法兰明杆软密封闸阀 DN350——大口径软密封闸阀，公称压力1.6MPa，适用于给排水系统。

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、闸阀选型的5个关键参数

3、 5 key parameters for selecting gate valves

选型闸阀，建议搞清楚以下5个参数：

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

1. 公称压力（PN） ——良工闸阀压力覆盖PN1.6~16.0MPa。压力等级决定了阀门的壁厚和强度。

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. 公称通径（DN） ——从DN15到DN5000均有覆盖。口径越大，对阀门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. 工作温度 ——良工闸阀温度范围从-29℃到550℃。高温工况需选用耐热钢材质，低温工况需选用低温钢。

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. 适用介质 ——水、蒸汽、油品、腐蚀性介质等，不同介质对密封材料和阀体材质有不同要求。

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

5. 连接方式 ——法兰连接、焊接连接、沟槽连接等。

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

四、闸阀的安装与维护要点

4、 Key points for installation and maintenance of gate valves

安装闸阀时，应保证阀杆朝上，便于操作和润滑。法兰连接需确保密封垫片对中，螺栓均匀拧紧。长期不操作的闸阀应定期进行启闭操作，防止闸板与阀座卡死。对于高温工况的闸阀，应注意热膨胀对密封性能的影响。

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.

本文由良工阀门友情奉献.更多有关的知识请点击:http://www.jnlgvf.com真诚的态度.为您提供为多维度的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

This article is a friendly contribution from Lianggong Valve For more information, please click: http://www.jnlgvf.com Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.