Floating Fully Welded Ball Valve

Model schedule illustration

 

 

●Series code:The series code of our company is FY

●Special requirement code: K-Antisulphur type    D-Low temperature type    EX-Pole extending type    M-Ground burying type

●Valve type code: Q-Ball valve

●Driving manner code: 3-Worm wheel and screw trensmission    6-Air driving    7-Hydrodynamic driving

                                           8-Air-hydro operated    9-Electric driving    9e-Explosion electric driving

●Connecting type code: 1-The interior whorl joining    2-The other whorl joining    4-The flange joining

                                             6-To welding joining     7-To inserting joining      8-The caliper joining

●Design feature code:1-Direct floating type 4—Floating type three direct links of Model L 5—Floating type three direct links of Model T

                                        7-Direct regular type 8-Regular type Model T three direct links 9-Regular type Model L three direct links

●Sealing formation code: Y-Hard alloy      F-Strengthen the polytetrafluoroethylene (PTFE)      N-Nylon PPL-Counterpoint polyphenyl

●Pressure grade code: The 10 times of the nominal pressure MPa, pound grade io practical number

●Body material code: C-WCB     I-WC6、ZG1Cr5Mo     V-WC9、ZG20CrMoV     P-CF8、ZG1Cr18Ni9Ti

                                          R-CF8M、ZG1Cr18Ni12Mo2Ti      S-CF3      L-CF3M      F-LCB      N-LC3

 

 

 

Standards

 

API Floating Ball Valve

Design and Manufacture: API 6D、ASME B16.34(BS5351)、API608、MSS-SP-72

Face to Face Dimension: ASME B16.10、API 6D

Flange Connection Dimension: ASME B16.5

BW Connection Dimension: ASME B16.25

Test and Inspection: API 598、API 6D

Fire-safe Design: API 607

 

GB Floating Ball Valve

Design and Manufacture: GB/T19672、GB/T12237

Face to Face Dimension: GB/T12221、GB/T19672

Flange Connection Dimension: JB/T79、GB/T9113、HG20592

Test and Inspection: JB/T9092

Fire-safe Design: JB/T6899

 

 

Costruction and Features of Floating Ball Valve

 

Application

 

Floating ball valves are suitable for use on various kinds of pipelines of Class 150 to Class 1500, PN16 to PN100 to turn on or off the pipeline medium, of which the operation types include manual, worm gear and pneumatic or electric actuators.

 

 

 

Reliable Seat Seal

 

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.

 

 

 

 

Fire Safe Design

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, API 6FA, BS6755 and JB/T 6899.

 

 

 

 

Reliable Stem Seal

 

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.

 

 

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.

 

 

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.

 

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

 

 

 

 

Anti-static Feature

 

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

 

 

 

Wrong Operation Prevention

 

To prevent the ball valve from wrong operation the key lock with 90° of open and close positioning pad has been provided, which can be lockable as required. At the stem head, where the lever fixes, a flat is so designed that the valve opens with the lever in parallel to piping, and with the lever right-angled to the piping, the valve is closed. So it is ensured that the valve indicator of open and close can never make mistake.

 

 

 

 

Mounting Pad Provided

 

Our company has provided for floating ball valve with a mounting pad, through which it is easy to fix the actuators, such as worm gear, pneumatic and electric actuators.

 

 

 

 

Operation Torque of Floating Ball Valve

 

The operation torque data of soft sealed floating ball valve in the following table are calculated based on normal temperature and clean medium. As selecting actuator,it is suggested that drive torque of actuator be more than 1.3 times the operation torque of ball valve at least. In case of high temperature and low temperature working conditions or unclean medium, it is possible that valve operation torque gets increased, which should be taken into full consideration as selecting actuators. Operation torque for metal to metal sealed trunnion ball valve is about 4 times that of soft sealed floating ball valve.

 

NPS	DN	Operation torque of soft sealed floating ball valve N.m
		Class150 PN20	Class300 PN50	Class600 PN110	Class900 PN150	Class1500 PN260	PN16	PN25	PN40	PN63	PN100
¹/₂	15	7	10	17	25	35	6	8	10	15	17
³/₄	20	10	16	24	35	50	9	12	15	20	24
1	25	16	25	40	65	100	14	18	23	35	40
1 ¹/₄	32	24	35	60	100	150	22	28	32	50	60
1 ¹/₂	40	35	50	90	20	180	32	40	45	70	90
2	50	50	70	110	180	270	40	55	65	85	110
2 ¹/₂	65	80	100	165	-	-	60	85	95	130	165
3	80	120	160	300	-	-	90	130	150	200	300
4	100	180	280	600	-	-	130	190	260	340	600
5	125	280	600	-	-	-	250	320	550	-	-
6	150	540	1000	-	-	-	490	620	900	-	-
8	200	960	2100	-	-	-	860	1100	1800	-	-
10	250	1800	-	-	-	-	-	-	-	-	-

 

 

Technical specification

 

Design reference		GB	API	ASME
Design standard		GB/T 12237	API 6D	ASME B16.34
Structural length	Flanged ends	GB/T 12221	API 6D	ASME B16.10
	Welded connection	GB/T 15188.1
Flanged ends		GB/T 9113 JB/T 79	ASMEB16.5、B16.47
Butt-weiding ends		GB/T 12224	ASME B16.25
Test & inspection		JB/T 9092	API 6D	API 598

 

Notes: The sizes of valve connecting flange and butt-welding terminas can be designed according to customer's requirement.

 

 

Major parts material form

 

	No.	Accessory name	Material
			GB	ASTM
	1	Seat	PTFE	PTFE
	2	The end covering	25	A105
	3	Body	25	A105
	4	Ball*	25+Hcr	A105+Hcr
	5	Stem**	1Cr13	A276-410
	6	Gasket	PTFE	PTFE
	7	Packing body	25	A105
	8	Packing seat	1Cr13	A276-410
	9	Packing	PTFE; Carbon fibre; Soft graphite
	10	Packing gland	25	A105
	11	Screw	35CrMo	A193-B7
	12	Locating piece	Q235A	Carbon steel
	13	Ring	65Mn	AISI1566
	14	Handle	KT330	A47-667Cr.32510

 

The material of this part about the anti-sulphur type valve is GB(1Cr18Ni9+Ni.P), ASTM(A182-304+Ni.P)

The material of this part about the anti-sulphur type valve is GB(1Cr18Ni9), ASTM(A276-321)

Major parts of the valve series and materials of sealing surface differ according to actual working condition and customer's special requirement.