SEV Fixed ball valve

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SEV Fixed ball valve
Posting date : Jul 17, 2007
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Free Member Scince Jul 14, 2007
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84-
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Detailed Description
Upper reach two-direction sealing valve    SEV fixed ball valve adopts advanced spring pre-tightening valve seat assembly and design principle of upper reach sealing ,which ensures good sealing performance of valve whether in low pressure, high pressure or in vacuum state. Each valve has two valve seats, enabling sealing in two directions. Therefore, it is a two-direction valve for there is no limit for installation direction, whichever end can be used as upper reach end.(please see Fig.1 for the structure) Double blockage-discharging valve    When SEV fixed ball valve is in the state of full close, valve seats of upper and lower reach block the fluid completely. Media or accumulated dirt in the middle cavity can be discharged regularly. Damage of valve cover by dirt can be reduced and service life of valve can be prolonged. (Please refer to Fig.2 for the structure) Automatic pressure discharge of middle cavity    Spring pre-tightening valve seat is used in SEV fixed ball valve. When pressure increases abnormally by media accumulated in the middle cavity, spring can be compressed to discharge pressure automatically. Full size or reduced size    Structure of full size or reduced size can be selected according to requirements. Hole diameter of full size valve is identical with inner diameter of pipeline, which facilitates cleaning of pipeline. Fire prevention structure    When non-metal valve seat is softened and burnt by accidental fire and abnormal temperatureincrease, specially designed supporting metal sealing surface of valve seat contact with the metal ball body under the load of spring for purpose of instantaneous sealing by contact of metal against metal, in compliance with SPI6FA and API607. (See Fig. for detailed structure) Auxiliary greasing valve    After valve seat and valve stem system are damaged, sealing grease can be filled through greasing valve for purpose of temporary sealing.( See Fig.5 for detailed structure) Valve stem sealing system     Internal and external O sealing rings are used on the part of valve stem part for purpose of sealing, ensuring reliable performance. Valve stem extension    Valve stem can be extended according to needs of installation and operation. Ball valve with extended stem is specially suitable for laying underground pipeline of gas in urban areas. Size of valve size can be decided according to needs of customers. Flexible operation    Teflon valve seat and valve stem bearing with small abrasion coefficient and good self-lubricating property are adopted which greatly reduced operating torque of valves. As a result, even if there is no sealing grease, valve can be operated flexibly for a long time. Multiple operating modes    Many operating modes can be selected among manual, pneumatic, electric, pneumatic-hydraulic linkage and hydraulic modes

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