A few days ago, China Copper held a June economic activity analysis meeting. Liu Jianping, member of the party group and deputy general manager of Chinalco, and secretary of the party committee and chairman of China Copper, attended the meeting and delivered a speech

Copper stocks continued to decline today. As of press time, Zijin Mining fell 5.28% to HK$10.4; China Gold International (02099) fell 4.79% to HK$22.85; China Nonferrous Mining (01258) fell 4.66% to HK$3.48; Jiangxi Copper Industry shares (00358) fell 2.2% to 16.04 Hong Kong dollars.

Two-way hard-to-hard butterfly valves are widely used in industrial pipelines such as low pressure, medium pressure, high pressure, steel metallurgy, petrochemical industry, electric power, etc., to block or regulate the flow of media. This article introduces the structural characteristics and precautions of the two-way hard-touch hard butterfly valve.

The application of the double gate valve is undoubtedly very helpful to the pipeline system software.

The lower end of the valve stem of the double gate valve is integrated with the wedge-shaped cone through the screw and pin shaft. The trapezoidal thread on the top is matched with the stem nut. The rotation of the stem nut is carried out by a manual wheel, wheel, bevel gear, electric or pneumatic device. The valve disc is composed of the upper and lower parts of the finite ring and the wedge regulating valve, respectively, it cannot be raised or lowered by the cone, it can only be translated or rotated by the wedge cone in a horizontally long space.

What is a parallel double gate valve? Parallel double gate valve is also called rising stem gate valve. When opened, the valve stem is exposed to the outside of the valve body and moves up and down. The stem nut is located on the valve cover or bracket, even if the nut rotates, the stem will not rotate, and the opening/closing part will move up and down to open and close the valve.