API 6FA Fire safe trunnion mounted ball valve

API 6FA Fire safe trunnion mounted ball valve introduction:
API 6FA Fire safe trunnion mounted ball valve is designed in accordance with API 6FA fire fire structure, 3 PC split body, side entry or top entry design. API 6FA Fire safe trunnion mounted ball valve is wide range of sealing material including PTFE, PEEK, DEVLON, NYLON, etc, which can be used in working temperature range -46ºC~ 500ºC.API 6FA Fire safe trunnion mounted ball valve is optional designed with Double block and bleed or double piston type.API 6FA Fire safe trunnion mounted ball valve is equipped with sealant injection system for both stem and seats to allow external intervention to prevent seat or stem leakage. The top entry ball valve can be used for in-line maintenance services. 
 
API 6FA Fire safe trunnion mounted ball valve specification: 

Trunnion mounted ball valve Size	NPS 2″ - NPS 56″
Pressure Rating	Class 150LB - Class2500LB
Material	WCB, LCB, CF8, CF8M, CF3, CF3M, A105, LF2, F304, F316, F304L, F316L
Design & Manufacturing Standard	API 608, API 6D, BS 5351, ASME B16.34, DIN, GOST, JIS
Fact to Face	ASME B16.5, API 6D
End Connection	ASME B16.5, ASME B16.47, ASME B16.25
Test and Inspection	ISO 5208, API 6D
Operation Method	Manual, Worm Gear, Electric Actuator, Pneumatic Actuator

 
API 6FA Fire safe trunnion mounted ball valve Technical Specifications
-Design: ASME 16.34/ API 6D
-Face to Face: ASME B16.10
-End Flange: ASME B16.5
-BW End: ASME B16.25
-Test: API 598/ BS 6755
-Fire Safe Test: API 607/API 6FA
-Special: NACE MR-01-75

API 6FA Fire safe trunnion mounted ball valve main material:

No	Part name	Material
1	Body Bonnet	Cast steel：WCB,LCB,WC6,WC9,CF8,CF8M,A890 4A,A995 5A, A995 6A,Cu5MCuC,CW6MC, Forged steel：A105N,LF2,F11,F22,F304,F316,F51,F53,F55, N08825,N06625;
2	Seat	Soft seat：PTFE,R-PTFE,Devlon,Nylon,PEEK； Metal seat：ENP/Ni60/Ni55/STL/TCC；
3	Ball	A105,F6,F304,F316,F51,F53,F55,N08825,N06625;
4	Shaft	A105,F6,F304,F316,F51,F53,F55,N08825,N06625;
5	Packing	Graphite,PTFE,Low leakage packing;
6	Gasket	SS+Graphite,PTFE;
7	Bolt/Nut	B7/2H,B7M/2HM,B8M/8BM,L7/4,L7M/4M;
8	O Ring	NBR,Viton Aed;
9	Actuator	Brand:Biifi,Rotork,Auma,Bernard,Limitorque,Sipos,Bettis Or China origin products are optional

API 6FA Fire safe trunnion mounted ball valve Design Features
1  Reliable seat seal
For soft seated trunnion mounted ball valve, the use of elastic sealing ring structure design.When the medium pressure is small, the contact area between the sealing ring and the ball is small, and a larger specific pressure is formed in the contact between the sealing ring and the ball to ensure reliable sealing.When the medium pressure is large, with the elastic deformation of the seal ring, the contact area between the seal ring and the ball increases, so that the seal ring can withstand a large medium thrust and will not be damaged.
For metal seated trunnion mounted ball valve, which adopt advanced technology of spraying, the seat and ball surface spraying hard material, when the assembly through the counterpart of the sealing surface grinding, which can achieve high hardness and roughness.And under medium pressure and seat back spring force, which can achieve zero leakage and long life.
2 Fire-safe structure between seat & stem & body cover sealing surface
Trunnion mounted ball valve fire safe design function, accord with standard API 607、API 6FA
when the trunnion mounted ball valve is on fire, ball valve seat ring is damaged, which can use fire metal convex platform structure, effectively control the ball valve temporary leakage .
                                                   On fire                                                                                After fire
            
The fire safe function of the valve stem is mainly realized through the fireproof graphite material  
The fire safe function of the valve body and bonnet seal is mainly realized through the fireproof gasket material 
3 Anti-blowout structure of shaft
API 6FA Fire safe trunnion mounted ball valve stem adopts bottom installation method, sealing force of back sealing increases with medium pressure and which can ensure the reliable seal of rod under various pressure.
API 6FA Fire safe trunnion mounted ball valve stem anti-blowout structure design, even in the extreme cases such as the abnormal pressure raise in valve cavity and packing pressure plate failure, etc., which can also ensure the valve stem not blown out by medium.
4  Anti-static structure between body/stem/ball
Between trunnion mounted valve body and valve stem, with anti-static spring; between the ball and valve stem, with anti-static spring.

Among body & ball & stem, the formation of anti-static channel, push the ball and seat  friction produces static electricity in the open and close process, through the body to the earth, and to prevent electrostatic spark,and avoid to cause fire or explosion danger.
5  Seat & stem with sealed/lubricated injection design (Only for trunnion mounted ball valve construction)
Seat & stem seal injection structure
When the API 6FA Fire safe trunnion mounted ball valve seat & stem seal ring is damaged, seal grease can be injected through the injection device to temporarily prevent leakage at the seat & stem seal.
Reminder: Seat injection structure, generally suitable for size  ≥6 " trunnion mounted ball valve;
Stem injection lubrication structure
At the stem place, by injecting grease through the injection device, the lubrication effect of the stem and packing can be improved to reduce the on-off torque and improve the on-off effect.
  
                                Seat injection structure                                                               Shaft injection structure    
6 Low leakage structure
Some toxic, flammable or explosive medium, medium leakage from the ball valve is not permitted.
Ball valve low leakage seal test, meet ISO 15848 standard
Low leakage ball valve design principle:
1. The API 6FA Fire safe trunnion mounted ball valve body should be able to meet the requirements of helium gas test. As the molecular volume of helium is small and easy to permeate, the body material is the key point;
2. The sealing of ball valve body and bonnet belongs to static sealing, so good sealing gasket material should be selected;
3. The stem seal is a dynamic seal, which is easy to take graphite particles out of the packing during the movement of the stem. Special low-leakage packing should be selected to control the clearance roughness of the stem, packing box, pressing sleeve and so on;