1、疏水閥

1. Drain valve

疏水閥又稱疏水器，它的作用在于阻氣排水，屬于自動(dòng)作用閥門。

A drain valve, also known as a trap, is an automatic valve that functions to block gas and drain water.

它的種類有浮桶式、恒溫式、熱動(dòng)力式以及脈沖式等。

Its types include floating bucket, constant temperature, thermal power, and pulse type.

2、閘閥

2. Gate valve

閘閥又稱閘門或閘板閥，它是利用閘板升降控制開閉的閥門，流體通過閥門時(shí)流向不變，因此阻力小。

Gate valve, also known as gate or gate valve, is a valve that uses gate lifting to control opening and closing. When fluid passes through the valve, the flow direction remains unchanged, resulting in low resistance.

閘閥和截止閥相比，在開啟和關(guān)閉閘閥時(shí)省力，水流阻力較小，閥體比較短，當(dāng)閘閥完全開啟時(shí)，其閥板不受流動(dòng)介質(zhì)的沖刷磨損。

Compared with globe valves, gate valves require less effort to open and close, have lower water flow resistance, and have shorter valve bodies. When the gate valve is fully opened, its valve plate is not subject to erosion and wear by the flowing medium.

選用特點(diǎn)：密封性能好，流體阻力小，開啟、關(guān)閉力較小，也有一定調(diào)節(jié)流量的性能，并且能從閥桿的升降高低看出閥的開度大小，主要用在一些大口徑管道上。

Selection characteristics: Good sealing performance, low fluid resistance, small opening and closing force, also has certain flow regulation performance, and the opening size of the valve can be seen from the height of the valve stem. It is mainly used in some large-diameter pipelines.

3、止回閥

3. Check valve

止回閥又名單流閥或逆止閥，它是一種根據(jù)閥瓣前后的壓力差而自動(dòng)啟閉的閥門。

A check valve, also known as a flow valve or a check valve, is a type of valve that automatically opens and closes based on the pressure difference before and after the valve disc.

它有嚴(yán)格的方向性，只許介質(zhì)向一個(gè)方向流通，而阻止其逆向流動(dòng)。

It has strict directionality, allowing the medium to flow only in one direction while preventing its reverse flow.

選用特點(diǎn)：一般適用于清潔介質(zhì)，對(duì)于帶固體顆粒和粘性較大的介質(zhì)不適用。

Selection characteristics: Generally suitable for cleaning media, not suitable for media with solid particles and high viscosity.

4、截止閥

4. Globe valve

截止閥主要用于熱水供應(yīng)及高壓蒸汽管路中，它結(jié)構(gòu)簡(jiǎn)單，嚴(yán)密性較高，制造和維修方便，阻力比較大。

Globe valves are mainly used in hot water supply and high-pressure steam pipelines. They have a simple structure, high tightness, easy manufacturing and maintenance, and relatively high resistance.

流體經(jīng)過截止閥時(shí)要轉(zhuǎn)彎改變流向，因此水流阻力較大，所以安裝時(shí)要注意流體“低進(jìn)高出”，方向不能裝反。

When the fluid passes through the shut-off valve, it needs to turn and change direction, so the water flow resistance is relatively high. Therefore, during installation, attention should be paid to the "low inlet and high outlet" of the fluid, and the direction should not be reversed.

選用特點(diǎn)：結(jié)構(gòu)比閘閥簡(jiǎn)單，制造、維修方便，也可以調(diào)節(jié)流量，應(yīng)用廣泛。

Selection features: The structure is simpler than gate valves, easy to manufacture and maintain, and can also adjust flow rate, making it widely used.