To build integrity management, fair and competitive market environment, strengthen the construction of quality and integrity system, ensure the valve product quality, safeguard the legitimate rights and interests of consumers, promote the building of the "Quality Wenzhou" and "Credit Wenzhou", we hereby solemnly committed the following points: I. We firmly establish the "Quality First" thinking, constantly enhancing the quality awareness and social responsibility...
Commitment of the Valve Quality & Credibility Read
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Following are the design, manufacture and inspection standards of our company. Check Valve: API 6D 24th Specification for Pipeline and Piping valves BS 1868-1975(R1990) Specification for Check Valves (Flanged and Butt-welding Ends) for the Petroleum, Petrochemical and Allied Industries EN14341-2006 Industrial valves —Steel Check Valves Gate Valve: API 600 13th Steel Gate Valves-Flanged and Butt welding Ends, Bolted...
Xinhai Statement of the Implement Valve Standards Read
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When valves used for sulfuric acid, hydrochloric acid, nitric acid, acetic acid, alkali (sodium hydroxide), ammonia (aqua ammonia), chlorine (liquid chlorine) and brine (seawater), alcohols, ketones, esters, ethers and other corrosive media, corrosion resistance is the most critical. If metal materials for chemical industry valves cannot be chosen with carefulness, it may damage equipment, or even resulting in accidents and disasters. The followings are the key points used to choose materials of...
Choose Chemical Industry Valves for Corrosive Media Read
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The followings are the reasons causing defects on castings of valve. 1. Pore Pores are formed by gas which cannot escape and remained in metal. The internal wall of pore is smooth and contains gas, which has higher reflectivity. Pores show spherality or ellipsoid basically (spot defect), having influence on amplitude of reflected wave. Pores in steel ingot is pressed into area defects after being forged or rolled, advantageous for being detected by ultrasonic wave. 2. Shrinkage...
Reasons Causing Defects on Castings of Valve Read
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When use pipeline to transmit liquid or gas, the cost is only 1/3 of railway transportation and 2/3 of marine transportation. So, pipeline has already been highly developed for 100 years. The valves used for pipeline are called as pipeline valves, including ball valve, gate valve, check valve and plug valve, which are dedicated valves meeting special requirements for pipeline transportation and having special functions. The ball valve used for pipeline is pipeline ball valve. Technical standards...
Pipeline Ball Valve Technical Requirements Read
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Before using sliver brazing to install valve, analyze the application to determine which valve is the most suitable for installation and keep in mind the service for which the valve is recommended. Before installing the correct valve, review the installation instructions to prevent damage to the valve and assure its maximum efficiency. 1.Cut tube end square. Ream, burr and size. 2. Use sand cloth or steel wire brush to clean both tube and cut to bright metal. Steel wool is not recommended. 3. Apply...
Silver Brazing Used to Install Valve Read
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Electrochemistry corrodes metals in different forms. It does not only function between two kinds of metals, but also can cause potential difference due to differential solubility of solution, differential solubility of oxygen and the tiny difference in internals of metals, enhancing corrosion. Some metals have poor resistance. However, they can form sensational protective film – passive film after being corroded, preventing be corroded by media further. So, to realize the corrosion resistance...
Corrupt Prevention Measures Used for Metal Valves Read
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For rising stem wedge gate valve, connection between stem and core loses efficacy which caused by corrosion, abrasion or improper operation during valve on-off, then, the core falls off. If the valve cannot be opened after being closed, the valve only can be cut out from the system and replaced. If the valve cannot be cut out from the system, it should be connected with other fluid system or stopped. 1. Repairing When the core falls off while cannot be cut out, change the assemble method...
Repair after Core Falling off Read
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Corrosion on valve body is considered that the metal materials are destructed under the environment of chemical or electrochemical environment. The corrosion is caused by spontaneous interaction between metal and surroundings. So, isolating metal from surroundings or using more nonmetal synthetic materials is the key of corrosion protection. Valve body including bonnet account the most of weight of valve and usually contact with medium. Therefore, choosing valve starts from the materials...
Corrosion Protection on Valve Body Read
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Intelligent pneumatic ball valve is driven by pneumatic actuator, having realized completed intelligent control. For its own advantages, intelligent pneumatic ball valve has been applied in different fields. For example, because of compact structure and reliable sealing, the valve is used for current limiting operation in amount of chemical plants. Features of intelligent pneumatic ball valve: 1. The seat of ball valve has good sealing. The sealing ring made of PTFE and other...
Features of Intelligent Pneumatic Ball Valve Read
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