产品指南 - 球阀(3)Product Guide—Ball Valves (3)
PVC和CPVC漂白剂球阀True Union型号CPVC and CPVC Bleach Ball Valves
True Union Model-C问题
The Problem
次氯酸钠，用于水处理，水族中心，以及造纸和纺织应用，可能淤积在封闭的球阀阀腔内导致阀门故障或失效，如不稳定化学物质的分解和腐烂。
Sodium hypochlorite, used in water treatment, aquatic centers, and paper and textile applications, can become trapped in the body cavity of a closed ball valve and create failure conditions as the unstable chemical decomposes.
Chemtrol解决方案
The Chemtrol Solution
漂白剂球阀是PVC或CPVC材料True Union型号C球阀的特殊工厂改进型产品，能够有效地将次氯酸钠排出到压力孔。此外，阀门内部表面始终保持湿润状态，以保证球阀在漂白剂的传输和喷射应用中能够无故障地工作。
The Bleach Ball Valve is a special factory modification to a PVC or CPVC True Union Model-C Ball Valve that effectively vents sodium hypochlorite out-gassing to the pressure port. In addition, the inner valve surfaces are kept constantly wetted to ensure problem-free use of the ball valves in bleach transfer and injection applications.
背景
Background
在氯真空气体喷射、淡水和污水处理、造纸厂和纺织厂、水族中心里更安全的替代品的研究过程中，人们采用了次氯酸钠作为消毒剂或漂白剂。一种高PH值特性的商用漂白剂，由标称15%次氯酸钠溶液，以及大约1-2%的氢氧化钠作为化学稳定剂。作为一种著名的强氧化剂，人们发现这种溶液会导致聚乙烯、聚丙烯和Kynar (聚偏氟乙烯均聚物)材料应力丧失，也导致金属材料产生反应，导致“硫化硫酸钠”的迅速分解。但是，配置碳氟化合物橡胶(FPM)密封的PVC和CPVC球阀，多年来已经能够成功应用来处理这种腐蚀性化学溶液。
In the search for a safer alternative to chlorine vacuum gas injection, fresh and wastewater treatment, paper and textile plants, and aquatic centers are converting to the use of sodium hypochlorite as a disinfectant or bleaching agent. A high pH level characterizes commercial bleach, which consists of a nominal 15% solution of sodium hypochlorite along with approximately 1- 2% of sodium hydroxide to act as a chemical stabilizer. Known as a good oxidizer, the solution has been found to cause stress cracking in polyethylene, polypropylene, and Kynar (PVDF homopolymer) materials. And metallic materials react, causing rapid decomposition of the “hypo.” However, PVC and CPVC, with fluorocarbon rubber (FPM) seals, have been successfully used for years to handle this aggressive chemical solution.
尽管一些系统结构设计考虑非常重要，但是，热、时间和阳离子仍然是漂白剂稳定性的敌人。当球阀在不工作期间关闭，经过一段时间，漂白剂将分解并释放出氧气。由于外露管道在阳光照射下吸热，或者淤积在球阀阀体的球与阀座之间的堆积物产生的反应热，使得这种分解速度加快。气体压力可能会在封闭的阀腔内慢慢积累，或者在反应情况下相当迅速地积累，这是就极可能产生阀门故障。
Some system design considerations are important, though. Heat, time, and positive ions are enemies of bleach stability. When a ball valve is closed in periods of inactivity, the bleach will decompose over time liberating oxygen gas. The decomposition rate is increased by heat absorbed from sun shining on exposed piping, or by reaction heat resulting from debris trapped in a ball valve body between the ball and its seats. Gas pressure may slowly build in the closed valve cavity, or quite rapidly in the reactive case. There are confirmed reports of ball valve structural failures.
此外，阀腔内次氯酸钠的蒸发可能导致结晶渣滓的形成，并最终渗入到球阀的TFE阀座内，因为由于粗糙的阀座导致球体的国度磨损，从而明显增加阀门旋转扭矩。
Also, evaporation of sodium hypochlorite in the ball cavity can lead to the formation of crystalline residue that eventually embeds in the TFE seats of a ball valve and significantly raises the turning torque due to excessive wear on the ball by fouled seats. A broken stem or frozen ball can be the ultimate failure in this case.
Chemtrol漂白剂球阀是唯一的塑料球阀，能够为次氯酸钠的传输和喷射应用提供可行的解决方案。我们独特的工厂装配的漂白剂球阀已经有效地消除了与次氯酸钠有关的问题，使用寿命甚至长达七年以上。为了确保所有阀门的内部表面能够经常保持湿润状态，并在阀门关闭期间能将次氯酸钠排出到上游位置，我们已经消除了阀腔内气体积累和结晶体产生的必要条件。
The Chemtrol Bleach Ball Valve is the only plastic ball valve offering a viable solution for sodium hypochlorite transfer and injection applications. Our unique factory-assembled bleach ball valve has effectively eliminated the problems associated with these uses for more than seven years. By ensuring that all inner surfaces of the valve are kept constantly wetted and vented to the upstream side when the valve is in the closed position, we have eliminated the conditions required for gas accumulation and caustic crystallization in the body cavity.
Chemtrol蝶阀，型号B，通径DN80 - DN150，对于漂白剂应用来说，是球阀的理想替代品。请参阅第10页了解主要的理由。
The Chemtrol Butterfly Valve, Model-B, in sizes 3" - 6", is an excellent alternative to the ball valve for bleach applications. See page 10 for important reasons why.
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永久的漂白剂
和排出/流向标志
Permanent Bleach
And Vent/Flow
Directional Marking 建议规格说明
Recommended Specification
从安全的角度出发，次氯酸钠的传输和喷射管道系统的用户必须确信其系统中的PVC或CPVC球阀是经过正确的制造、清洗、组装、测试，并且在安装过程中按照系统设计的意图进行正确定向。因此，用于漂白剂的传输和喷射系统的工程技术规格说明应该包括下列产品、安装和所要求的预投产检查：
In the interest of safety, owners of sodium hypochlorite transfer and injection piping systems must have confidence that the PVC or CPVC ball valves in their system were properly manufactured, cleaned, assembled, tested, and oriented during installation in accordance with intended system design. Therefore, engineering specifications for bleach transfer and injection systems should include the following product, installation, and precommissioning inspection requirements:
[*]所有PVC或CPVC漂白剂球阀必须是True Union类型，配置增能器的阀座，在低压端口进行自动调整能够同时消除磨损的消极影响，并提供无泄漏服务。球体必须包含一个能够排出到下游密封端口的反面的压力端口处。
All PVC or CPVC bleach ball valves must be of the True Union type with an energized seat that will concurrently provide automatic adjustment for wear and leak-free service at the lower pressure port. And the ball must contain an adequate vent to the pressure port opposite of the downstream sealing port.[*]所有PVC或CPVC漂白剂球阀的制造商必须在进行工厂组装、测试和阀门包装之前全部完成所有的部件的生产。由任何制造商或供应商组装的阀门改进型是不能接受的。此外，阀门必须单独包装，每个纸箱标签注明：漂白剂球阀，通径，材料和制造商。
The manufacturer of all PVC or CPVC bleach ball valves must complete all components prior to the factory assembly, test, and packaging of those valves. Modification of assembled valves by any manufacturer or vendor is unacceptable. Also, the valves must be individually packaged with each carton label stating: Bleach ball valve, size, material, and manufacturer.[*]漂白剂球阀必须在外部永久性标志：漂白剂；两个反向箭头，一个标志流向，另一个标志排出孔；以及NSF (美国全国卫生设备基金会国际的标记，表示已认证可用于饮用水)。
Bleach ball valves must be permanently marked externally with: the word Bleach; two opposing directional arrows, one inscribed with Flow and the other with Vent; and NSF (symbol of the National Sanitation Foundation International, indicating approval for use with potable water).不要将本样本中的测试数据用在压缩空气或其它气体上。如果需要关于专用于压缩空气和其它气体的抗龟裂热塑塑料管道系统请参阅Chemtrol Chem-Aire®产品样本。
Do not use or test the products in this catalog with compressed air or other gases. See Chemtrol Chem-Aire® literature for information about shatter-resistant thermoplastic piping systems specifically designed for compressed air and other gases.
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