1. Lianggong valve connection is a widely used valve connection mode. According to the shape of the combination surface, it can be divided into: smooth type: suitable for low-pressure valve; Easy to process concave convex: high working pressure, medium hard gasket tenon groove form can be adopted: gasket with large plastic deformation can be adopted, which is widely used in corrosive media and has good sealing effect. Trapezoidal groove type: oval metal ring is used as gasket, which is suitable for valves with pressure greater than 64kg / cm2 or high temperature valves. Mirror surface type: the liner is a lens made of metal. It is applicable to high-pressure valve or high-temperature valve with pressure greater than 100 kg / cm2. O-ring: This is a relatively new form of flange connection. It has developed with the emergence of various rubber O-rings. It is more reliable than ordinary flat gaskets.

良工阀门

Lianggong valve

2.夹紧连接采用螺栓直接夹紧阀门与两端管路。

2. The clamping connection adopts bolts to directly clamp the valve and the pipelines at both ends.

3.对焊良工阀门连接。

3. Butt welding good worker valve connection.

4.这是一种简单的连接方式，通常用于小良工阀门。二种情况：直接密封：内外螺纹直接起密封作用。为保障接头不漏水，常采用铅油、线麻、聚四氟乙烯生料带填充，其中聚四氟乙烯生料带应用广泛，耐腐蚀，密封效果优良，使用及保存方便。拆开时可完全取出，因为是无粘性膜，比铅油、线麻要好得多。间歇封：将螺纹上紧的力传给两平面之间的垫圈，使垫圈起密封作用。

4. This is a simple connection method, which is usually used for small good worker valves. Two cases: direct sealing: internal and external threads directly play a sealing role. In order to ensure that the joint is watertight, lead oil, hemp and PTFE raw material belt are often used for filling. Among them, PTFE raw material belt is widely used, corrosion-resistant, excellent sealing effect and convenient for use and storage. It can be completely taken out when disassembled, because it is a non adhesive film, which is much better than lead oil and hemp. Intermittent sealing: transmit the tightening force of the thread to the washer between the two planes to make the washer seal.

5.夹套连接在我国近几年出现。它的联接与密封原理是，当螺母拧紧时，夹套受压，使其刃口咬进管道外壁，夹套的锥面在受压作用下与接头体内的锥面密封，可可靠防止泄漏。

5. Jacket connection has appeared in China in recent years. Its connection and sealing principle is that when the nut is tightened, the jacket is pressurized to make its edge bite into the outer wall of the pipe, and the conical surface of the jacket is sealed with the conical surface in the joint body under pressure to prevent leakage.