GB Cast Steel Floating 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.

Technical specification

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
	1	Bonnet	WCB
	2	Nut	35
	3	Gasket	Graphite+stainless steel
	4	Stud	35CrMoA
	5	Body	WCB
	6	Seat	PTFE
	7	Ball*	25+HCr
	8	Stem**	1Cr13
	9	Gasket	PTFE
	10	packing	Graphite
	11	Packing gland	WCB
	12	Screw nail	35
	13	Locating piece	Q235A
	14	Ring	65Mn
	15	Wrench	KT33

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.

Technical specification

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
	1	Gasket	Graphite+stainless steel
	2	Seat	PTFE
	3	Bonnet	25
	4	Nut	32
	5	Stud	35CrMoA
	6	Body	25
	7	Ball*	25+HCr
	8	Stem**	1Cr13
	9	Gasket	PTFE
	10	Packing seat	1Cr13
	11	Packing	Graphite
	12	Packing gland	WCB
	13	Bolt	35CrMoA
	14	Locating piece	Q235A
	15	Ring	65Mn
	16	Handle	KT33

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.

Main Size of Outside

Model: (K)Q3(6、7、8、9)4(6)1F(Y、N、PPL)

Note: The face to face dimension and connecting flange of a diameter reduced valve are per the non-reducing norms; the sizes of both valve height and actuator are reduced by one norm size.