进口锻钢法兰高压球阀通过螺栓紧固, 有效的抵消了来自管路间的高压共振，阀体之间依靠不锈钢金属丝混合石墨制成的缠绕垫片保证了决定的零泄漏.考虑到防火设计的要求，特别的金属对金属密封, ,在垫片遭到破坏或者分解后, 依然能有效的控制阀门的外漏 RETZ The forged steel flange high pressure ball valve is fastened by bolts, which effectively counteracts the high pressure resonance from the pipelines. The spiral wound gaskets made of stainless steel wire mixed with graphite between valve bodies ensure zero leakage Considering the requirements of fire protection design, the special metal to metal seal can still effectively control the leakage of the valve after the gasket is damaged or disassembled

采用标准Standards

进口锻钢法兰高压球阀性能描述 Performance description

1.阀座的可靠密封 Reliable Seat Seal

采用弹性密封圈结构设计。当介质压力较小时，密封圈与球体接触面积较小，在密封圈与球体接触形成较大的密封比压，确保可靠密封。当介质压力较大时，随着密封圈的弹性变形，密封圈与球体的接触面积增大，故密封圈能承受较大的介质推力而不会损坏 retz品牌 The structure design of elastic sealing ring has been adopted for floating ball valves. This seat design features a bigger sealing pressure ratio between the ring surface and the ball when medium pressure gets lower, where the contacting area is smaller. Thus, the reliable seal is ensured. When the medium pressure gets higher, the contacting area between seat ring and ball becomes bigger as the sealing ring transforms elastically to undertake the bigger force pushed by the medium without any damage.

2.防火结构设计Fire Safe Design

使用现场发生火灾时，当聚四氟乙烯等非金属材料制作的阀座密封圈、阀杆上密封垫、阀杆密封填料以及中法兰密封垫片在高温下分解或破坏后，球阀能够借助于特别设计的金属对金属辅助密封结构，有效地控制阀门的内漏和外漏。对于用户有防火要求的浮动式球阀，RETZ的防火设计均符合API607、API6Fa、BS6755 及JB/T6899等标准规范的要求。

With the valve heated in a fire application the non-metal material parts such as seat sealing ring of PTFE, stem back seat gasket, gland packing, and the sealing gasket between body and bonnet might disintegrate or be damaged due to high temperature. specially designed structure of auxiliary metal to metal seal is provided to effectively prevent both internal and external leakage of the valve. As required by customers, floating ball valves with fire safe design can meet the requirement of API 607,API6FA,BS6755 and JB/T 6899.

阀座的防火结构设计 Firesafedesignofseat

阀杆的防火结构设计 Firesafedesignofstem

中法兰密封的防火结构设计 Fire safe design of valve body and bonnet flanges

3.阀杆的可靠密封 Reliable Stem Seal

阀杆采用防吹出结构设计，即使在阀腔异常升压以及填料压板失效等极端情况下，也能保证阀杆不会被介质吹出。阀杆采用有倒密封的下装式结构设计，倒密封的密封力随着介质压力的增高而增大，故能在各种压力下均能确保阀杆的可靠密封。

The blow-out proof design has been adopted for the stem to ensure that even if the pressure in the body cavity is risen acc-idently and the packing flange becomes invalid, the stem may not be blown out by medium. The stem features the design with a backseat, being assembled from underneath. The sealing force against the backseat gets higher as the medium pressure becomes higher. So the reliable seal of the stem can be assured under variable medium pressure.

阀杆采用V型填料密封结构，V型填料能将填料压盖的压紧力及介质力有效地转化成阀杆的密封力

V type packing structure has been employed to effectively trans form the pushing force of the gland flange and the medium pressure into the sealing force against the stem.

将传统的填料压盖改进为填料压板与填料压套的两体式结构设计，填料压套与填料压板采用球形接触，确保填料压套始终垂直，并在填料压套内部设置了聚四氟乙烯衬套，避免了阀杆与填料压套的擦伤与磨损，并减小了阀门的操作力矩

The traditional packing flange design has been improved to be of two piece structure i.e., being as a gland flange and gland, the latter contacts the gland flange with spherical surface. Thus, the gland remains vertical always, and is lined internally with a PTFE bush to prevent the galling against and friction between thestem, which can also reduce the operation torque of the valve.

根据用户的需要，可以采用蝶形弹簧加载的填料压紧机构，使阀杆填料的密封更加可靠。

Based on customers' requirement, a packing tightening design may be employed to obtain more reliable stem packing seal, which is loaded by beve-lling spring

4.防静电结构Anti-static Feature

根据用户要求，球阀可以设有防静电结构。采用弹簧一柱塞式静电引出装置，使球体与阀体之间直接形成静电通道（对于DN≤25的球阀）或通过阀杆使球体与阀体之间形成静电通道（对于DN≥32的球阀）。从而可将球体与阀座开关过程中摩擦产生的静电通过阀体引到大地，防止静电火花可能引起的火灾或爆炸等危险。

主要零部件材料 Main parts and materials

二片式锻钢球阀主要结构图 Main Structure Diagram of Two piece Forged Steel Ball Valve

三片式锻钢球阀主要结构图 Main Structure Diagram of Three piece Forged Steel Ball Valve