Trunnion Ball Valve

Design and manufacturing: GB/T 12237-1989;API 608
The structural length: GB/T 12221-1989;ASME/ANSI B 16.10
Connection forms: HG/T20592-20605 GB/T9112-9124
Inspection and test: GB/T 13927-1992;API 598
Caliber: DN50~DN1500 2″~60″
Pressure temperature level: GB/T12224
Drive mode: Manual, worm gear, pneumatic, electric
Pressure: PN1.6MPa~PN42.0MPa Class150~Class2500

Product Overview

A trunnion ball valve is a heavy-duty quarter-turn valve designed for reliable shut-off in high-pressure and large-diameter pipeline systems. The ball is mechanically supported by upper and lower trunnions, which minimise operating torque and ensure stable sealing under fluctuating pressure conditions. This design allows consistent performance, longer seat life, and smooth operation, even in demanding oil and gas, petrochemical, and industrial applications. Trunnion-mounted ball valves are commonly manufactured to API 6D standards and are available with soft or metal seats, fire-safe designs, and various actuation options.

Product Features

Low operating torque
The trunnion ball valve uses line pressure to assist sealing, allowing the load to be transferred through the trunnion support rather than the valve stem. This design minimises ball movement, keeps seat stress evenly distributed on both sides, and significantly reduces operating torque.
Spring-loaded metal seat structure
A spring-energised metal valve seat ensures reliable sealing under high temperature, high pressure, and varying pipeline conditions. This structure allows the trunnion ball valve to perform consistently across a wide range of media and operating environments.
Customised design for demanding media
According to customer requirements, the trunnion ball valve can be specially designed to handle complex media such as granules, powders, slurries, and paste-like materials, improving service life and operational stability.
Wide range of industrial applications
Trunnion ball valves are widely used in oil & gas, chemical processing, natural gas transmission, food and pharmaceutical plants, steel and iron manufacturing, environmental protection systems, and pulp and paper industries, where reliable shut-off and long-term performance are critical.

◇Structural characteristics and uses

1.Low operating torque and smooth operation: The valve is supported by upper and lower ball bearings, which significantly reduce friction during operation. This design minimises operating torque by eliminating excessive seat load caused by line pressure acting on the ball, ensuring smooth and reliable valve operation even under high pressure.

2. Reliable sealing performance (see Figure 1)
The valve seat consists of a PTFE elastic insert embedded in a stainless steel seat ring. A metal spring provides continuous preload, ensuring consistent contact between the ball and the sealing surface. Even as minor wear occurs during operation, the spring-energised seat automatically compensates for friction loss, maintaining tight and reliable sealing performance.

3. Fire-safe design (see Figure 2): To prevent catastrophic leakage in the event of fire or sudden high temperatures, the valve is designed with a fire-safe structure. If the PTFE seat is damaged or burnt, the spring mechanism pushes the seat ring towards the ball, forming a metal-to-metal seal. This secondary sealing provides effective leak limitation and enhances safety. Fire-safe testing complies with API 6FA and API 607 standards.

4. Automatic cavity pressure relief (see Figure 3)
When the valve is in the closed position and pressure inside the body cavity rises above the spring preload, the seat automatically moves away from the ball to relieve excess pressure. Once the pressure is released, the seat returns to its original position, ensuring safe and automatic pressure balancing without external intervention.

5. Body vent and drain design: The valve body is equipped with upper and lower vent/drain connections. These ports allow operators to check seat leakage, safely release cavity pressure when the valve is fully open or closed, and replace packing without depressurising the pipeline. This design also helps reduce medium accumulation inside the cavity, minimising environmental pollution.

6. Emergency sealing and injection system (see Figure 4): An auxiliary valve seat is designed for emergency sealing applications. In the event of seal damage or abnormal operating conditions, sealant can be injected directly onto the sealing surface to restore tight shut-off. For media containing small solid particles, cleaning agents or lubricants can also be injected to protect the sealing surface and ensure long-term sealing reliability.

7. Wide application range: The valve is widely used in industries such as food processing, pharmaceuticals, petroleum, chemical processing, natural gas, steel, environmental protection, and paper manufacturing, where reliable pipeline isolation or flow control is required.

Specification Parameters

◆ Implementation of Standards

Design and manufacture: GB/T 12237-1989; API 608
Inspection and test: GB/T 13927-1992; API 598
Flange connection: JB/T 79.1–4-1994; ASME/ANSI B16.5
Structure length: GB/T 12221-1989; ASME/ANSI B16.10

◆ Performance Specifications

Test Pressure (Unit: MPa)

Nominal Pressure	Maximum Temperature Working Pressure	Case Test Pressure	Gas Seals Test Pressure	High-pressure Sealing Test Pressure
PN 1.6	1.6	2.4	0.6	1.76
PN 2.5	2.5	3.8	0.6	2.75
PN 4.0	4.0	6.0	0.6	4.4
PN 6.4	6.4	9.6	0.6	7.1
PN 10.0	10.0	15.0	0.6	11.0
Class 150	2.0	3.0	0.6	2.2
Class 300	5.0	7.5	0.6	5.5
Class 600	10.0	15.0	0.6	11.0

◆ Terms of Use

Shell Material	Work Temperature (°C)	Applicable Media
Carbon steel C	≤425°C	Water, steam, oil, etc.
Chrome P-type nickel-titanium steel	≤200°C	Nitric acid
Chrome-nickel steel Re-Mo Ti	≤200°C	Acetic acid
Chromium molybdenum vanadium steel I	≤550°C	Steam, metallurgical, energy, etc.

◆ Main Components Material

Body, Bonnet	GB	WCB	ZG1Cr18Ni9Ti	ZG0Cr18Ni12Mo2Ti	ZG15Cr1Mo1V
Body, Bonnet	ASTM	A216 WCB	CF8	CF8M	WC9
Ball	GB	2Cr13 + Special surface treatment	1Cr18Ni9Ti + Special surface treatment	0Cr18Ni12Mo2Ti + Special surface treatment	25Cr2Mo1V + Special surface treatment
Ball	ASTM	420 + HF	304 + HF	316 + HF	F22a + HF
Stem, Fixed Axis	GB	2Cr13	1Cr18Ni9Ti	0Cr18Ni12Mo2Ti	25Cr2Mo1V
Stem, Fixed Axis	ASTM	420	304	316	F22a
Seat	GB	2Cr13	1Cr18Ni9Ti	0Cr18Ni12Mo2Ti	25Cr2Mo1V
Seat	ASTM	420	304	316	F22a
Packing	GB	Flexible Graphite	Flexible Graphite	Flexible Graphite	Flexible Graphite
Packing	ASTM	Flexible Graphite	Flexible Graphite	Flexible Graphite	Flexible Graphite
Bolt	GB	35CrMo	0Cr18Ni9	0Cr18Ni9	15Cr1Mo1V
Bolt	ASTM	A193 B7	A320-B8	A320-B8	A193 B16
Nut	GB	45	0Cr18Ni9	0Cr18Ni9	20CrMo
Nut	ASTM	A194 2H	A194-8	A194-8	A194-4

◇ Main Connection Dimensions (size:mm)

Nominal Pressure(PN)	DN	L	D	K	d	Y	b	z–d0	Ws	Hs	Hw	Hd
1.6 MPa	150	394	285	240	210	–	24	8–23	1000	305	470	540
	200	457	340	295	265	–	26	12–23	–	–	520	580
	250	533	405	355	320	–	30	12–25	–	–	610	640
	300	610	460	410	375	–	30	12–25	–	–	650	690
	350	686	520	470	435	–	34	16–25	–	–	740	785
	400	762	580	525	485	–	36	16–30	–	–	795	830
	450	864	640	585	545	–	40	20–30	–	–	860	910
	500	914	715	650	608	–	44	20–34	–	–	945	990
	600	1067	840	770	718	–	48	20–41	–	–	1040	1090
	700	1245	910	840	788	–	50	24–41	–	–	1150	1210
	800	1372	1025	950	898	–	52	24–41	–	–	1280	1340
	900	1524	1125	1050	998	–	54	28–41	–	–	1430	1510
	1000	1753	1255	1170	1110	–	56	28–48	–	–	1580	1640
	1200	2032	1485	1390	1325	–	58	32–54	–	–	1810	1910
	1400	2300	1685	1590	1525	–	60	36–54	–	–	2010	2115
2.5 MPa	150	403	300	250	218	–	30	8–25	1000	305	470	555
	200	502	360	310	278	–	34	12–25	–	–	540	595
	250	568	425	370	332	–	36	12–30	–	–	630	655
	300	648	485	430	390	–	40	16–30	–	–	650	705
	350	762	555	490	448	–	44	16–34	–	–	740	795
	400	838	620	550	505	–	48	16–34	–	–	795	830
	450	914	670	600	555	–	50	20–34	–	–	860	910
	500	991	730	660	610	–	52	20–41	–	–	945	990
	600	1143	845	770	718	–	56	20–41	–	–	1040	1090
	700	1346	960	875	815	–	60	24–48	–	–	1150	1210
	800	1524	1085	990	930	–	64	24–48	–	–	1305	1340
	900	1727	1185	1090	1025	–	66	28–54	–	–	1505	1600
	1000	1880	1320	1210	1140	–	68	28–58	–	–	1615	1705
	1200	2184	1520	1420	1350	–	72	32–58	–	–	1925	2035
	1400	2300	1755	1640	1560	–	78	36–65	–	–	2110	2185

PN (MPa)	DN (mm)	L	D	K	d	Y	b	z–d0	Ws	Hs	Hw	Hd
4.0 MPa	150	403	300	250	218	204	30	8–25	1200	360	485	590
	200	502	375	320	282	260	38	12–30	–	–	580	640
	250	568	450	385	345	313	42	12–34	–	–	665	680
	300	648	515	450	408	364	46	16–34	–	–	760	810
	350	762	580	510	465	422	52	16–34	–	–	820	890
	400	838	660	585	535	474	58	16–41	–	–	860	940
	450	914	685	610	560	524	60	20–41	–	–	930	1010
	500	991	755	670	612	576	62	20–48	–	–	980	1130
	600	1143	890	795	730	678	62	20–54	–	–	1040	1090
	700	1346	995	900	835	768	68	24–54	–	–	1150	1210
	800	1524	1140	1030	960	876	76	24–58	–	–	1305	1340
	900	1727	1270	1168	1022	–	105	32–54	–	–	1505	1600
	1000	1880	1238	1156	1086	–	114	32–44	–	–	1615	1705
	1200	2184	1467	1372	1302	–	133	32–51	–	–	1925	2035
	1400	–	1708	1600	1518	–	154	28–60	–	–	2110	2185
6.4 MPa	150	495	345	280	240	204	38	8–34	1200	360	485	590
	200	597	405	345	300	260	44	12–34	–	–	580	650
	250	673	470	400	352	313	48	12–41	–	–	665	720
	300	762	530	460	412	364	54	16–41	–	–	760	840
	350	826	600	525	475	422	60	16–41	–	–	820	930
	400	902	670	585	525	474	66	16–48	–	–	870	990
	500	1054	800	705	640	576	70	20–54	–	–	995	1150
	600	1232	930	820	750	678	76	20–58	–	–	1100	1180
	700	1397	1035	940	800	–	95	28–51	–	–	1180	1230
	800	1651	1149	1054	914	–	108	28–54	–	–	1345	1385
	900	1880	1270	1168	1022	–	114	32–54	–	–	1550	1655
	1000	1981	1270	1175	1092	–	133	32–51	–	–	1675	1745
	1200	2311	1511	1403	1308	–	152	28–60	–	–	1945	2075

Class	DN (in)	L	D	K	d	Y	b	z–d0	Ws	Hs	Hw	Hd
Class 150	2″	178	152	120.5	92	–	16	4–19	260	155	–	–
	2½”	190	178	139.5	105	–	18	4–19	350	185	–	–
	3″	203	190	152.5	127	–	19	4–19	500	205	–	–
	4″	229	229	190.5	157	–	24	8–19	650	256	390	500
	5″	356	254	216	186	–	24	8–22	800	285	410	520
	6″	394	279	241.5	216	–	26	8–22	1000	305	470	540
	8″	457	343	298.5	270	–	29	8–22	–	–	520	580
	10″	533	406	362	324	–	31	12–25	–	–	610	640
	12″	610	483	432	381	–	32	12–25	–	–	650	690
	14″	686	533	476	413	–	35	12–29	–	–	740	785
	16″	762	597	540	470	–	37	16–29	–	–	795	830
	18″	864	635	578	533	–	40	16–32	–	–	860	910
	20″	914	699	635	584	–	43	20–32	–	–	945	990
	24″	1067	813	749.5	692	–	48	20–35	–	–	1040	1090
	28″	1245	927	864	800	–	71	28–35	–	–	1150	1210
	32″	1372	1060	978	914	–	81	28–41	–	–	1280	1340
Class 300	2″	216	165	127	92	–	23	8–19	260	155	–	–
	2½”	241	190	149	105	–	26	8–22	350	185	–	–
	3″	283	210	168.5	127	–	29	8–22	500	205	–	–
	4″	305	254	200	157	–	32	8–22	800	270	410	530
	5″	381	279	235	186	–	35	8–22	1000	305	470	560
	6″	403	318	270	216	–	37	12–22	1200	340	485	590
	8″	502	381	330	270	–	42	12–25	–	–	580	640
	10″	568	445	387.5	324	–	48	16–29	–	–	665	680
	12″	648	521	451	381	–	51	16–32	–	–	760	810
	14″	762	584	514.5	413	–	54	20–32	–	–	820	890
	16″	838	648	571.5	470	–	58	20–35	–	–	860	940
	18″	914	711	628.5	533	–	61	24–35	–	–	930	1010
	20″	991	775	686	584	–	64	24–35	–	–	980	1130
Class 600	2″	292	165	127	108	82.560	26	8–19	350	175	–	–
	2½”	330	190	149	127	101.600	29	8–22	500	200	–	–
	3″	356	210	168	146	123.825	32	8–22	650	235	–	–
	4″	432	273	216	175	149.225	38	8–25	1000	275	395	550
	5″	508	330	266.5	210	180.975	45	8–29	1200	325	430	580
	6″	559	356	292	241	211.138	48	12–29	–	–	495	620
	8″	660	419	349	302	269.876	56	12–32	–	–	595	680
	10″	787	508	432	356	323.851	64	16–35	–	–	680	740
	12″	838	559	489	413	381.001	67	20–35	–	–	790	850

Specification Applications

o Oil & Gas
o Petrochemical Processing
o Power Generation (Steam, Thermal, Nuclear)
o Water Treatment and Distribution
o Food and Beverage (Sanitary applications)
o Pharmaceutical Manufacturing
o HVAC Systems
o Chemical Processing
o Industrial Manufacturing
• Specific Applications:
o High-pressure pipelines
o Sanitary applications requiring easy cleaning and maintenance
o Multi-flow control for mixing or diverting flows

Valve Actuation

Process Optimization

Precision Engineering

Pipeline Solutions

Industrial Valves

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