Class 150: 2"-60", Class 300: 2"-48", Class 600: 2"-36" Full Welded Ball Valve Main Standard: API 6D

Model NO. Fully welded ball valve

Design Features
Main Standard: API 6D/ISO 14313
Applications: Oil & Gas Transmission and distribution pipelines (also called fully welded pipeline ball valve), HIPPS, Heating supply
Application Standard: API 6D, ISO 14313, ASME VIII, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards
Size Range: Class 150: 2"-60", Class 300: 2"-48", Class 600: 2"-36"
Class 900: 2"-24", Class 1500: 2"-20", Class 2500: 2"-12"
Special Test: EN 10204 Type 3.2 Material Certification by a Thirty Parts, API 641 Fugitive Emissions, PMI, NDE test.
_____________________________________________
Design Standards
Face to face to ANSI B16.10
Flanges to ANSI B16.5, B16.47
Top flange to ISO 5211
Material according to NACE MR-0175
Testing to API 598, API 6D
Fire safe API 607, API 6FA, ISO 10497

Quantity

Fully welded ball valve of SJ

SJ fully welded ball valves have a compact integrated body structure compared with traditional split‑body ball valves. The fully welded ball valve provides reliable leak‑tight performance and is suitable for pipeline transmission, storage station, long‑distance pipeline and petrochemical process applications. Fully welded ball valves are available in sizes from DN15 to DN1200 and secure pressures up to Class2500, at operating temperatures of -29°C to +425°C. The fully welded ball valves are manufactured in carbon steel, stainless steel and duplex stainless steel.

Technical specification
Design reference		API	ASME	rOCT
Design standard		API6D	ASME B16.34	/
Structural length	Flanged ends	API6D	ASEM B16.10	/
	Welded connection
Flanged ends		ASME B16.5/ASME B16.47		rOCT 33259 rOCT 12815
Butt-welding ends		ASME B16.25
Test &inspection		API6D	API598	rOCT 9544
Notes:The sizes of valve connectingflange and butt-welding terminas can be designed according to customer's requirement.

Main material
	Part Name	Main Material		Part Name	Main Material
1	Body	WCB,LCB,LCC,4A,CF8,CF3,CF3M,CF8M,G20Mn5. Inconel,Monel,Alloysteel,Aluminium Bronze	16	Trunnion	Matchingwith valve body
2	Cover		17	Drain plug	Component
3	Ball	A105,LF2,F304,F304L,F316,F316L,F321,F416,F440CF5	18	Grease injection valve	Matching with valve body
4	Seat Retainer	A105,LF2,F304,F304L,F316,F316L,F321,F416,F440CF5	19	Anti static device	IncX-750
5	Seat Seal	PTFE,RPTFE,DEV,NLY,PPL,POM,PEEK,+STL,+TCC, +Ni60410,LF2,F304,F304L,F316,F316L,F321,F416,F440C,F51,Inconel,Monel,Alloy steel,Aluminium Bronze	20	Spring	IncX-750
6	Stem		21	Hexagon socket screw	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze
7	Thrust Washer	PTFE	22	Metal winding gasket	SS+Graphite
8	Pin	1035	23	O Ring	HNBR,VITON,VITONAED,VITON GTL
9	O Ring	HNBR,VITON,VITONAED,VITON GTL	24	Nut	2H,2HM,7,7M,Inconel,Monel,Alloy steel,Aluminium Bronze
10	Spiral Wound Gasket	SS+Graphite	25	Stud	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze
11	Connecting flange	Matching with valve body	26	Flexible graphite braided filler	Graphite
12	Key	1035	27	O Ring	HNBR,VITON,VITONAED,VITON GTL
13	O Ring	HNBR,VITON,VITONAED,VITON GTL	28	O Ring	HNBR,VITON,VITONAED,VITON GTL
14	Hexagon socket screw	B7,B7M,L7,L7M,Inconel,Monel,Alloy steel,Aluminium Bronze	29	Metal gasket	SS+Graphite
15	Bearing	SS+Graphite	30	Drain plug	Component
			31	Worm Gear	Assembly
Notes:Major parts of the valve series and materials of sealing surface differ according to actual working condition and customer's special requirement.

Fully welded ball valve
Full bore
Nominal Size		D		L		H1		H2		W		Weight
in	mm	in	mm	in	mm	in	mm	in	mm	in	mm	Lb	kg
2	50	2.01	51	11.5	292	7.87	200	4.33	110	10.43	265	46.3	21
3	80	2.99	49	14.0	356	11.81	300	4.98	126	11.22	285	70.8	32
4	100	3.94	100	17.0	432	12.4	315	6.5	185	11.22	285	110.2	50
6	150	5.91	150	22.0	559	13.19	335	6.5	185	11.81	300	381.8	164
8	200	7.91	201	26.0	660	15.94	405	7.87	200	11.81	300	780.6	300
10	250	9.92	252	31.0	787	16.81	427	8.67	220	11.81	300	970.0	440
12	300	11.93	303	33.0	838	18.31	465	10.31	282	19.69	500	1272.1	577

The above parameters are based on Class150--1.6~2.5MPa and are for reference only. For detailed information, please consult the technical team.

Fully Welded Ball Valves

The function of Fully Welded Ball Valve

Q: What is the main function of a fully welded ball valve in pipeline systems?

A: The fully welded ball valve is a high‑integrity rotary shut‑off valve with one‑piece welded body structure. Its core functions include reliable on‑off cut‑off and medium isolation for long‑distance transmission pipelines, oil‑gas gathering and distribution stations. The fully‑welded design eliminates flange joint leakage risks. It can realize pipeline switching, equipment isolation and emergency shut‑down, and is suitable for high‑pressure, large‑diameter transmission working conditions. It maintains stable sealing performance under long‑term pipeline operation.

Conclusion: Therefore, the main function of the fully welded ball valve is to achieve leak‑tight on‑off and isolation for long‑distance process pipelines, reducing leakage risks and providing safety guarantees for pipeline operation, maintenance and emergency disposal.

The principle of using Fully Welded Ball Valve

Q: What is the working principle of a fully welded ball valve?

A: The working principle of the fully welded ball valve adopts the 90‑degree rotation of the internal ball core, same as conventional ball valves. When opened, the ball through‑hole aligns with the pipeline passage for medium flow. When closed, the ball rotates 90°, and the spring‑loaded seat tightly seals against the ball surface to cut off flow. Its body is fully welded as an integrated unit without split bolted joints. It is available in floating‑ball or trunnion‑mounted structures. Trunnion‑mounted design delivers low operating torque for high‑pressure large‑size service. The welded body minimizes external leakage points for underground and buried pipeline installation.

Conclusion: Therefore, the operating principle of the fully welded ball valve relies on 90‑degree ball rotation for pipeline switch‑off. The integrated fully‑welded body removes bolt‑joint leakage risks, realizing safe and stable fluid control for long‑distance transmission pipelines.

The operating conditions and advantages of Fully Welded Ball Valve

Q: What are the common applications and key advantages of Fully Welded Ball Valves?

A: Fully welded ball valves are widely applied in long‑distance oil‑gas transmission pipelines, gas storage stations, petrochemical process systems and buried underground pipelines. They fit pressure ratings up to Class2500, sizes from DN15 to DN1200, with operating temperature range from -29℃ to +425℃. Its key advantages include:

Zero External Leakage Risk: Integrated fully‑welded body eliminates bolted flange joints, greatly reducing external leakage possibility.

Compact & Light‑weight: No extra flange connection, saving installation space, ideal for buried and underground pipeline projects.

High Structural Strength: Welded body offers excellent resistance to pipeline pressure and external soil load.

Multiple Structure Options: Floating‑ball for medium‑size low‑pressure service; trunnion‑mounted for large‑size high‑pressure service.

Flexible Actuation Compatibility: Can be equipped with manual, gear, electric, pneumatic actuators for manual or automatic remote control.

Wide Material Selection: Body materials include carbon steel, stainless steel and duplex stainless steel for different medium requirements.

Conclusion: Therefore, the fully welded ball valve is a high‑reliability fluid control solution for long‑distance oil‑gas transmission. With prominent advantages of zero‑leakage body, high structural strength and compact design, it is a core shut‑off component for buried and long‑distance pipeline systems.

As a leading industrial valve manufacturer, SJ is proud to deliver high‑performance fully welded ball valve solutions tailored for long‑distance oil‑gas transmission, gas stations and petrochemical projects. SJ fully welded ball valves are offered in floating‑ball and trunnion‑mounted designs, covering sizes DN15‑DN1200 and pressure up to Class2500. Our valves adopt integrated fully‑welded body structure to avoid external leakage, with body materials of carbon steel, stainless steel and duplex stainless steel. They can be matched with manual, gear, electric or pneumatic actuators to satisfy site automation demands. Strictly manufactured and tested according to API‑6D and ASME B16.34 standards, SJ fully welded ball valves provide outstanding sealing reliability and structural durability for critical transmission pipeline applications.

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Head Office Address: Viale del Lavoro.19,20003 Casorezzo Ml. Italy Testing zone
Address:Via S. Giovanni Bosco S.n.c.70020 – Poggiorsini (BA) – ITALY

EMAIL: andant@sanjingvalve.com
PHONE: +39 389 949 9067
WHATSAPP: +39 389 949 9067

Branch Office Address: Dongou Industrial Zone, Oubei Street, Yongjia Wenzhou City, Zhejiang Province China Testing zone 2 Address:No. 205, Linwu Road, Sanqiao Industrial Zone

What exactly is the relationship between SANJING Valve Company and SJ Valvole S.R.L.?

SANJING Valve Company is the main manufacturing company, responsible for valve production, quality control, testing, and technical support. SJ Valvole S.R.L. serves as SANJING’s Italian office, supporting its business development, customer communication, and commercial activities in Italy and the European market.

Integrated Manufacturing and European Service

The two operations work together to provide customers with coordinated manufacturing and local market support:

Manufacturing & Quality Control: SANJING Valve Company manages valve manufacturing, inspection, testing, and quality control at its production facilities.

European Market Support: SJ Valvole S.R.L. supports customer communication, commercial coordination, and business development in Italy and other European markets.

Project Coordination: Customer requirements, technical specifications, documentation, production, and delivery can be coordinated between the Italian office and the manufacturing team.

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