活套法蘭連接：這是良工閥門中用得較多的連接形式。按結合面形狀又可分為以下幾種：

Loop flange connection: This is a commonly used connection form in Lianggong valves. According to the shape of the joint surface, it can be further divided into the following types:

1、光滑式：用于壓力不高的閥門。加工比較方便。

1. Smooth type: used for valves with low pressure. Processing is relatively convenient.

2、凹凸式：工作壓力較高，可使用中硬墊圈。

2. Convex convex type: With high working pressure, medium hard washers can be used.

3、榫槽式：可用塑性變形較大的墊圈，在腐蝕性介質中使用較廣泛，密封效果較好。

3. Mortise and tenon type: gaskets with large plastic deformation can be used, which are widely used in corrosive media and have good sealing effects.

4、梯形槽式：用橢圓形金屬環作墊圈，使用于工作壓力≥64公斤/平方厘米的閥門，或高溫閥門。

4. Trapezoidal groove type: using elliptical metal rings as washers, used in valves with a working pressure of ≥ 64 kg/square centimeter or high-temperature valves.

5、透鏡式：墊圈是透鏡形狀，用金屬制作。用于工作壓力≥100公斤/平方厘米的高壓閥門，或高溫閥門。

5. Lens type: The gasket is in the shape of a lens and is made of metal. Used for high-pressure valves or high-temperature valves with a working pressure of ≥ 100 kg/square centimeter.

6、O形圈式：這是一種較新的法蘭連接形式，它是隨著各種橡膠O形圈的出現，而發展起來的，它在密封效果上比一般平墊圈可靠。

6. O-ring type: This is a relatively new flange connection form that has developed with the emergence of various rubber O-rings. It is more reliable in sealing than ordinary flat washers.

螺紋連接：這是一種簡便的連接方法，常用于小閥門。又分兩種情況：

Thread connection: This is a convenient connection method commonly used for small valves. There are two further situations:

1、直接密封：內外螺紋直接密封。為了保證接頭不滲漏，經常用鉛油、麻和聚四氟乙烯基原料帶填充;其中，聚四氟乙烯原料帶應用廣泛;這種材料耐腐蝕性好，密封性效果非常不錯，使用保存方便，拆卸時可以完全去除，因為是不粘膜，比鉛油和線麻優越很多。

1. Direct sealing: The internal and external threads are directly sealed. To ensure that the joint does not leak, lead oil, hemp, and polytetrafluoroethylene based raw materials are often used for filling; Among them, polytetrafluoroethylene raw materials are widely used; This material has good corrosion resistance, excellent sealing effect, and is easy to use and store. It can be completely removed during disassembly because it is non adhesive and much superior to lead oil and hemp.

2、間接密封：螺紋擰緊的力傳遞到兩個平面之間的墊片上，使墊片起到密封作用。

2. Indirect sealing: The force of tightening the thread is transmitted to the gasket between two planes, making the gasket play a sealing role.

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