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铸钢浮动式球阀

浮动球阀的体积小,重量轻,结构简单,密封性好,但球体承受工作介质的载荷全部传给了出口密封圈因此要考虑密封圈材料能否经受得住球体介质的工作载荷。


Floating ball valves are small in size, light weight, simple structure, good sealing, but ball workunder medium load to export all seals and therefore to consider sealing material can withstandsphere medium work loads.

高性能弹性浮动阀座

设计原理:唇式密封技术

制造范围: 1寸-4寸

迺用温度: -46℃-250"℃

P.T.F.E:150Lb-600LbP.T.F.E:150Lb-1500Lb

DEVLON:150Lb-2500Lb NYLON:150Lb-2500Lb

PEEK:150Lb-2500Lb NESPEL:150Lb-2500Lb

High performance flexible floating seatDesign principle: lip shape seal technology

Manufacturing scope:1-4inch

Applicable temperature: -46C- 250C

Applicable pressure: P.T.F.E:150Lb-600Lb P.T.F.E:150Lb-1500Lb

DEVLON:150Lb-2500Lb NYLON:150Lb-2500LbPEEK:150Lb-2500Lb NESPEL:150Lb-2500Lb



技术特点

1.唇形设计

想要让密封材料像橡胶一样,受压时可以发生较大的变形,来填补金属表面的微观不平度,而当应力消除后又能回复其原来的形状,这种现象被称为材料的“记忆特性”所以我们的目的,就是要设计-一种密封座的形状,克服PTFE的“冷流" 和热膨胀特性的缺陷来改善其记忆特性。这种密封结构称之为具有挠性的唇式密封技术。

2.双层密封结构

由于阀座是唇形设计,在初始密封时是下点密封,当压力升高阀座唇形位置变形,形成两点密封,使密封性能更加可靠。

3.背压变形结构

阀座背面有一定的弧度来减小直角变形的缺点, 同时使唇形阀座具有优良的弹性性能。

4.外形变形结构

阀座外圆上作出一定的弧度角,用来防止唇形阀座变形带来的挤压应力过大。

1. Lip shape seal design

The rubber will occur large deformation under pressure to offset theroughness of metal surface, and can recover its original shape whenstress relief. This material is called as " Memory Property". We planto create a new seat material that can overcome the defects ofPTFE cold flow and thermal expansion and improve the memoryproperty. This sealing structure is called as Lucky Lip SealTechnology.

2. Double layers sealing structure

The lip shape seal seat has the advantages that its position will bechanged due to high temperature, which will form double pointssealing, sealing performance is more reliable.

3. Backpressure deformation structure

There is a certain radian on the back side of the seat to prevent theright angle from being defomed, and it also can improve the lipshape seal seat elasticity.

4. Shape deformation structure

The radian angle on the seat mainly avoid the higher extrusionstress occurred because of the deformation of the lip shape sealseat.

(1)如右图所示:为传统的填塞式密封方式,塑料应变发生在球体与密封座和阀体与密封座之间,这两个区域的接触应力大小,决定阀门的密封性能。

(1) As shown on the right: lt is a conventional packed type sealmethod, the strain stress of plastic between ball and seat or bodyand seat, of which contact areas size will decide valve sealing.

(2)如下图所示:我公司这-改进使密封座具备下列功能:使球体保持在阀腔中心,球体浮动是微小的;装配后,唇部发生变形,能蓄储弹性变形能,实现低压下的密封;密封座上有一支撑点,当压力升高,温度升高时,平衡部分作用在密封座上的介质力;防止材料可能产生的“冷流"。

这种截面形状的唇式密封座装配前的形状和图A所示。装配后的形状如图B所示,有四个接触点,B点是与球体接触的密封点,A点是与阀体接触的密封点,C点是与球体接触的支撑点,D点是与阀体接触的支撑点。

装配前后唇缘的形状变化,蓄储了材料的弹性变形能,像弹簧- -样。而且当温度或压力升高时,进一步吸收弹性变形能,当温度或压力下降时,泄放弹性变形能来获得记忆特性。

(2) As shown below figure: The improved sealing seat has theflowing characteristics: keep the ball in the center of body and alittle floatation; the lip area will occur a deformation afterassembling and obtain low pressure seal; the supporting point, incase of pressure and temperature increasing, to balance themedium force onto seat, this can prevent the cold flow happened.

The shape of unmounted lip shape seat cross section as shownfigure A, the completed shape as shown figure B, there are 4contact points, point B refers to sealing point contacting with ball,point A to sealing point contacting with ball, point C to supportingpoint contacting with ball while point to supporting point contactingwith ball.

The elasticity is reserved similar like spring due todeformation. When temperature or pressure increasing, to absorbin the elastic deformation energy; while decreasing, to obtainmemory property after release the elastic deformation energy.

(3)人工开槽,用以实现给与阀座在挤压过程中自我保护。

(3) Grooving to protect the seat from being destroyed in the extrusion

(4)上下碰触,中部赋予弹性空间的方式保证材料弹性蓄能能力实现记忆特性。同时减少接触面面积,降低扭矩

(4) Up and bottom contact, to reserve material elasticity and obtain

(5)新型阀座图:

(5) New type seat figure of Cheng Gong:process.

部件材质

1.防止误操作手柄

阀门的开、关常常是通过手柄的位置来确认,手柄与管道平行为开阀、垂直为关阀。但普通球阀手柄与阀杆的连接是扁四方,容易因手柄与阀杆的连接错误而造成阀门]的误操作。而浮动型球阀手柄与阀杆的连接是扁平方不可能造成手柄的连接错误,更不会出现误操作。

2.锁定机构

手动球阀在全开、全关位置,可用锁锁定,以防非工作台人员扳动手柄,造成阀门的误操作。也可防止因管线震动,或不可测的因素造成阀开或关,出现事故。特别是对于易爆油、化学药品等工作管线、或者野外配管场合,具有更加有效的作用。

3.防止出阀杆凸肩

浮动球阀,为防止因阀门]内压的异常升高而使阀杆飞出的危险,在阀杆的下部设置了凸肩,此外为防止火灾出现时,使阀杆密封盘根烧损后,出现泄漏,在阀杆下部凸肩与阀体接触出设置了止推轴承,形成倒密封座,防止泄漏,避免事故的扩大。

对于普通球阀,若阀杆盘根烧损,或盘根压盖,螺栓有缺损,阀杆手内压的作用容易飞出,流体外溢,出现事故,升值加大事故程度,这是安全要求所不允许的。

1. Avoid wrongly operate lever

Usually, to check valve operation status by checking the lever'sposition, it means open when the lever is parallel with the pipeline, andif vertical with the pipeline the valve is closed. The general shapeconnected between the lever and stem is flat rectangle which cancause to wrongly operation due to incorrect connection. However, theshape of floating ball valve from Cheng Gong is flat square, no wrongconnection will be happened and even no wrong operation.

2. Ball valve with locking device

Manual ball valve shall be locked in the full on or off position in order toprevent the valve from being operated improperly by non-employee.This also can reduce accident possibilities from pipeline shake or otherunexpected things, especially for the valve used in the services ofexplosive oil, chemicals and field environment.

3. Blow-out proof stem design

To prevent the stem from being blown out as a result of abnormallyrising of floating ball valve intemal pressure, a raised shoulder speciallydesigned on the bottom of the stem. And to eliminate the fires and stopthe leakage because the packings bumed out, thrust bearing mountedon the contact position between raised shoulder and stem, which cangenerate a reversed seal seat to prevent any leakage.

Subjected to the intemnal pressure, the general ball valve has thedisadvantages that the stem is easier to be blown out in the case ofpackings bumned out and the damage of gland and bolts. The fluid willspilt out lead to big accident happened, that is really forbidden.

浮动球阀阀杆转动采用金属TFE(RPPL)作为轴承,可防止阀杆卡死现象,保证操作轻便灵活。

The TFE/RPPL metal material bearing for ball valve canprevent the stem being jammed and easy operation.



4.防静电性能

浮动球阀为防止由于球体及阀杆与TFE(或RPPI)的摩擦而产生静电,容易静电打火点燃易燃爆介质出现工况事故。在阀杆与球体及球体与阀体之间设置了导静电弹簧,使静电通过管路导入地下,保证系统安全。

4. Anti-static performance

To reduce static electricity which exists in ball, stem and TFE/RPPIseat, it is possible that the static charge will be discharge to bumableor explosive medium and creating spark, we require an anti-staticspring in the ball-stem connection and ball-body connection. Therefore,the build-up static electricity will be immediately connected to theground and ensure system safety.

5.耐火结构

为防止因火灾或聚热的出现,是阀座烧损时,发生较大泄漏,而助长火势,球阀在球体和阀座间设置了防火密封环,当阀座烧损后,介质将球体迅速推向下游端的金属密封环上,形成金属一- -金属接触,起一定程度的密封。从而保证系统的安全。


5. Fire-proof protective structure

ChengGong company set a fire-proof seal ring to protect seat in caseof fire. The ball will be pushed into the downstream immediately underthe action of medium, it can help to seal once connected with eachothers to safeguard the system safety.

6.特殊阀座结构

多年制造经验,设计出具有弹性力的双重密封阀座结构,对于高压,低压及真空状态均具有优良的密封效果。

6. Special seat structure

According to our several years' experiences, we develop a kind ofdouble sealing seat with elasticity that hasanexcellent sealingperformance when used in the high pressure valve, low pressure valveand vacuum valve.

7.无外漏阀体密封结构

阀体与侧阀体的连接部是靠垫片密封,灾、高温、震动及开、并扭矩的不均等因素,均可造成该处的外泄漏。浮动球阀除依靠垫片的密封外,特设计为阀体与侧阀体的金属一金属接触,形成金属密封,保证不外漏。

7. No external leakage body sealing structure

Since there is just a gasket between body and cover, it will leak incase of fire, high temperature, shake and uneven tighten torque. Inaddition to gasket for the floating ball valve, the contacts areas bodyand cover specially designed to metal seal and can avoid extemalleakage.