Double Wall bellows is a new type of lightweight pipe made of high-density polyethylene. It has the characteristics of light weight, high pressure resistance, good toughness, fast construction and long service life. Its intentional wall structure design and other structures Compared with pipes, the cost is greatly reduced. And because the connection is convenient and reliable,

Ball valves include: floating ball valve, fixed ball valve, track ball valve, V-shaped ball valve, three-way ball valve, stainless steel ball valve, cast steel ball valve, forged steel ball valve, ash unloading ball valve, sulfur resistant ball valve, pneumatic ball valve, electric ball valve, ferrule ball valve and welded ball valve. According to the classification

1. Bypass valve: the ball valve is generally opened by static water, so the bypass valve is set for flat pressure first, that is, both sides are filled with water; 2. Air valve: when filling water, remove the air and take the float to close the valve by itself; During drainage, make up air and

Compared with other types of valves, pneumatic ball valve has the advantages of angular stroke output torque, rapid, stable and reliable opening, wide application, and the following advantages: 1. The thrust bearing reduces the friction torque of the valve stem, which can make the long-term operation of the valve stem stable and flexible. 2. Anti

Ball valve is a valve whose opening and closing parts (ball) are driven by the valve stem and rotate around the axis of the ball valve. It can also be used for fluid regulation and control. Among them, there is a strong shear force between the V-shaped ball core of hard sealed V-shaped ball valve

1. When the angle globe valve is opened, when the opening height of the valve disc is 25% ~ 30% of the nominal diameter, the flow has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the full open position of the stop valve shall be determined by the stroke

Usually domestic, we use stainless steel flange, it is the common lathe to produce the flange, there will be some positive and negative error. Therefore, people are called theoretical weight, at present, the domestic general use of theoretical weight as the flange standard. In addition, we can also use the Department of Chemical Industry flange

The carbon steel flange seal is through the pretension force of the bolts, causes the gasket and the flange seal surface to produce the sufficient pressure, the gasket surface produces the distortion enough to fill the flange seal surface the microscopic irregularity, achieves the goal which does not leak. Through tempering, the metallographic microstructure tends to stabilize,