Welded Structure Trunnion Type 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 Trunnion 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 Trunnion 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

 

 

Design Features of  Trunnion Ball Valve

 

Urgent Grease Injection Device

 

According to customers' requirement the trunnion ball valve made by our company are provided with devices for urgent grease injection, which are on both the stem and seat for the trunnion ball valves of DN> 150mm (NPS6), and in the body cavity for the valve of DN<125mm. When the O ring of stem or the body seat ring is damaged due to accident, the medium leakage between body and stem can be prevented by injecting the sealing grease through the device.

 

 

Double-blockand Bleed Functions

 

In general, our company's trunnion ball valve features the front ball sealing design structure. Each seat of the ball valve can separately cut off the medium at both inlet and outlet of the valve to realize double-block functions. When the ball valve is close, body cavity and two of the body ends can be blocked with each other even if both the inlet and outlet are under pressure, when the medium left in the body cavity might be bled through the relief valve.

 

 

Blow-out proof stem

 

Blow-out proof structure is provited with for the stem. which is positioned by the up-end cap and screw, being guaranteed not to be blown-out by the medium even if at abnormal risen pressure in the cavity.

 

 

 

Fire Safe Design

 

With the valve heated in a fire application, the non-metal material parts such as seat sealing ring of PTFE, O ring for the stem and sealing gasket for body and bonnet, might be damaged due to high temperature. Our company's special design of auxiliary metal to metal or the graphite seal is provided for the trunnion ball valve to effectively prevent both internal and external leakage of the valve. As required by customers, our company's fire safe design for the trunnion ball valve meets the requirement API 607, API 6Fa, BS6755 and JB/T 6899.

 

 

 

 

Self-relief in the Body Cavity

 

As the liquid medium left in the body cavity gasifies due to increased temperature, the pressure in the body cavity becomes abnormally higher, when the medium itself in the cavity would propel the seat and self-relieves the pressure to ensure the safety of valve.

 

 

 

 

The Bi-sealing Design Structure, i.e.Seat Sealing In Front of the Ball and Seat Sealing Behind the Ball

 

According to some special working conditions andcustomers' requirement, our company is has provided the trunnion ball valve with the Bi-sealing design structure, i.e.seat sealing in front of the ball and seat sealing behind the ball, thus the reliable sealing of the valve is ensured because the valve can perform normally even if one of the effective sealing designs becomes lost due to the abnormal condition.

 

Regarding the seat in front of the ball, the piston effect formed by the area difference between D1 and D2, plus the pre-tightened force of a spring would cause the seat in front of the ball by the pressure difference of the medium before and after the valve to touch the ball closely to form the tightness, of which the sealing force will become bigger as the pressure difference gets higher.

 

Regarding the seat after the ball, the piston effect formed by the area difference between D2 and D3, plus the pretigh-tened force of a spring would cause the seat behind the ball to touch the ball closely to form the tightness, of which the sealing force willbecome bigger as the pressure difference gets higher.

 

 

 

 

Anti-static Design

 

The ball of the trunnion ball valve gets close contact with each other through the trunnion, adjusting cushion and down-end cap, the passage of static electricity thus forms together with the valve, which may lead the static electricity caused by sparks generated by friction between the ball and seat during on and off performance to the ground to prevent the posible risk of fire or explosion.

 

 

 

Mounting Pad Provided

 

Our company is has provided for trunnion ball valve with a mounting pad for fixing the actuators,such as worm gear, pneumatic, electric, hydraulic and pneumatic &hydraulic acturtors.

 

 

 

Model schedule illustration

 

Valve models compiled per JB/T308 *compilation method of valve model"

 

 

 

Operation Torque of Trunnion Ball Valve

 

The operation torque data of soft sealed trunnion 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 3~4 times that of soft sealed trunnion ball valve.

 

NPS	DN	Operation torque of soft sealed trunnion ball valve N.m
		Class150 PN20	Class300 PN50	Class600 PN110	Class900 PN150	Class1500 PN260	Class2500 PN420	PN16	PN25	PN40	PN63	PN100	PN160
1 ¹/₂	40	-	-	-	-	100	160	-	-	-	-	-	-
2	50	-	-	70	100	155	250	-	-	-	-	70	105
2 ¹/₂	65	-	-	120	170	265	420	-	-	-	-	120	180
3	80	-	-	280	320	500	800	-	-	-	-	230	340
4	100	110	200	340	480	750	1200	100	140	170	240	340	500
5	125	180	290	550	780	1200	1900	160	220	260	350	550	820
6	150	340	480	800	1100	1700	2700	300	380	450	600	800	1150
8	200	500	850	1700	2400	3700	5900	450	630	750	1300	1700	2500
10	250	830	1400	2800	4000	6200	9900	750	1050	1250	2000	2800	4200
12	300	1400	2400	4200	5900	9100	-	1250	1750	2100	2900	4200	6200
14	350	2200	3100	5800	8100	-	-	2000	2600	2800	3700	5800	-
16	400	2600	4800	7500	10500	-	-	2350	3200	4300	5800	7500	-
18	450	3700	6100	9500	-	-	-	3300	4600	5500	-	-	-
20	500	4800	7500	11500	-	-	-	4300	6000	6800	-	-	-
24	600	8200	12000	16500	-	-	-	7400	10000	11000	-	-	-
26	650	9600	15000	-	-	-	-	-	-	-	-	-	-
28	700	12000	19000	-	-	-	-	-	-	-	-	-	-
30	750	14000	22000	-	-	-	-	-	-	-	-	-	-
32	800	16000	28000	-	-	-	-	-	-	-	-	-	-
36	900	20000	35000	-	-	-	-	-	-	-	-	-	-

 

 

 

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	Spring	Inconelx-750	Inconelx-750
	2	Seat	25	A105
	3	Sealing ring	PTFE	PTFE
	4	O Ring	NBR-18	NBR-18
	5	Put the valve stem**	1Cr13	A276-410
	6	Bottom cover	25	A105
	7	Slip the bearing	PTFE	PTFE
	8	Body	25	A105
	9	The end covering	25	A105
	10	O Ring	NBR-18	NBR-18
	11	Ball*	A105+HCr	A105+HCr
	12	ORing	NBR-18	NBR-18
	13	Stem**	1Cr13	A276-410
	14	Key	45	AISIC 1045
	15	Grease injectionvalve	Package	Package
	16	Packing body	25	A105
	17	O Ring	NBR-18	NBR-18
	18	Packing case	25	A105
	19	Packing seat	1Cr13	A276-410
	20	Packing	PTFE; Carbon fibre; Soft graphite
	21	Packing gland	WCB	A216-WCB
	22	Screw	35CrMo	A193-B7
	23	Yoke	Q235A	Carbon steel
	24	Connection set	45	AISIC 1045
	25	Key	45	AISIC 1045
	26	Driving	Package	Package

 

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.