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The Origin and Development of the Valve (Part Two) 

Valves can be classified into block valves, regulating valves, check valves, diverter valves, safety valves and multi-purpose valves six categories based on their functions. Block valves are mainly used for cutting off fluid passages, and check valves, gate valves, plug valves, ball valves, bu...

The Origin and Development of the Valve (Part One) 

A valve is a device which controls the fluid's flow, pressure and direction, which is a control component in the piping system. The controlled fluid may be a liquid, a gas, a gas-liquid mixture or a solid-liquid mixture. The control function of the valve is fulfilled by relying on the driving me...

Manufacturing of Valves (Part Three)

C. The internal parts with no need for overlaying sealing surfaces The manufacturing process of the internal parts with no need for overlaying sealing surfaces consists of the following steps: procurement of raw materials (according to the standard), the factory inspection (according to the standard...

Manufacturing of Valves (Part Two)

4. The Process Planning of Valve Parts A valve only has a few of major parts. The simple structure, the inaccurate machining and the rough external surface of the major parts leave people an impression that the major parts are just the simple components. Actually, the precision of the core sealing p...

Manufacturing of Valves (Part One)

How to make valves? How much do you know about it? The Manufacturing Technology Features of Valves When first seeing valves, you will find that valves have a few components, simple structures and general precision. Valves belong to simple parts in the mechanical industry, however, the central seal ...

China (Yiwu) International Pump and Valve Fire Fighting Equipment Fair 2017

Exhibition Address: Yiwu International Expo Center. Sponsor: Yiwu Pengxiang Exhibition Co., Ltd. Co-organizer: Zhejiang Pump & Valve Industry Association and Yiwu Zhongbo Exhibition Service Co., Ltd. Contractor: Yiwu Pengxiang Exhibition Co., Ltd. China (Yiwu) International Pump and Valve Fire ...

An Introduction of Wafer Butterfly Check Valve

A wafer butterfly check valve has the valve clack opened and closed automatically by the fluid of media for preventing backflow of media, which is also known as a backflow valve, non-return valve, reflux valve and pressure relief valve. With simple structures, this kind of valve can only be mounted ...

Improvement of Ball Valves Sealing Performance

Present Situation and Analysis of Ball Valve Sealing Cast stone ball valve is an ideal disc for ash pipeline and its back seal will directly affect the quality and service life of itself. In the past, it adopted an O-shaped rubber seal structure in which an O-shaped sealing ring was placed in an a...

Applicable Scopes and Principles of Ball Valves

1. Applicable Fields of Ball Valves Ball valve seat gaskets are made of rubber, nylon and polytetrafluoroethylene(PTFE), so their operating temperature is limited by the valve seat sealing material. The stop function of the ball valve is realized by the mutual compaction of the m...

Joint Russia and Venezuela Deal with Oil Price Decline

"Deutsche Welle" reported on November 19th , that Russian Energy Minister Novak revealed in Moscow that he had held a meeting with Venezuelan Foreign Minister Rafael Ramirez dealing with the continued falling of oil prices, and agreed to take "joint action" to confront with the...