Trunnion Mounted Ball Valve
Engineered for high-pressure pipeline transmission, refinery manifold isolation, and emergency shutdown (ESDV) duties. Features heavy-duty forged or cast split bodies, secondary metal-to-metal fire-safe seating, double block and bleed (DBB) capabilities, and automatic cavity overpressure relief.
Design & Compliance Standards
Strict adherence to American, European, and international piping codes for global upstream, midstream, and chemical refinery compliance.
| Engineering Parameter | Applicable Codes, Standards & Design Criteria |
|---|---|
| Design & Manufacturing | API 6D (License 6D-1832), API 608, ASME B16.34, BS 5351, ISO 14313 |
| Face-to-Face Dimensions | ASME B16.10, API 6D, ISO 5752, EN 558-1 |
| Flanged End Connections | ASME B16.5 (NPS ≤ 24"), ASME B16.47 Series A / MSS-SP-44 (NPS > 24"), EN 1092-1 |
| Butt-Weld (BW) Ends | ASME B16.25, custom schedule matching pipe schedule (STD, XS, SCH 40/80/160/XXS) |
| Top Flange Actuation Pad | ISO 5211 direct mounting pad with keyed or double-D stem interface |
| Pressure & Temperature Rating | ASME B16.34 (Standard & Special Class rating curves) |
| Fire-Safe Certification | API 607 6th Ed. (DNV witnessed SHA/872728/1301-677 for NPS 8"+ Cl. 600-900), API 6FA & ISO 10497 fire-tested designs |
| Fugitive Emission Containment | ISO 15848-1 Class AH / BH, API 641, TA-Luft compliance for volatile VOC media |
| Sour Service Compliance | NACE MR0175 / ISO 15156, NACE MR0103 hardness testing and HIC/SSCC resistant metallurgy |
| Testing & Inspection Protocols | 100% hydrostatic shell & seat test per API 598 & API 6D; low-pressure air seat test (6 bar) |
| Quality Documentation | EN 10204 Type 3.1 Mill Test Certificates; Type 3.2 Third-Party Inspection on request |
Critical Engineering Features That Prevent Failure
Designed from the ground up for maximum sealing integrity, reduced operational torque, and fail-safe overpressure protection.
DBB & DIB Dual Cavity Relief
Equipped with spring-energized upstream and downstream seats. Single Piston Effect (SPE) enables automatic body cavity self-relieving into the pipeline. Double Piston Effect (DPE / DIB-1) is available with external thermal relief valve.
PMSS Primary & Fire-Safe Sealing
Primary seal uses Devlon V, PEEK, or PTFE inserts for bubble-tight low-pressure shutoff. If exposed to fire, the polymer is decomposed and secondary metal-to-metal seat contact halts leakage per API 607 standards.
Blowout-Proof Stem & Anti-Static
The stem is inserted internally with an integral heavy T-type collar to eliminate blowout risk under extreme cavity pressure. Conductive springs guarantee electrical grounding between ball, stem, and body (<10 Ohms).
Emergency Sealant Injection
Standard on NPS 6" and larger. Dedicated grease injection fittings with internal check valves allow emergency sealant injection directly to the stem packing and seats if foreign pipeline debris scores the sealing face.
Standard & Severe Service Material Selection
Strictly certified mill material sourced with full chemical, mechanical, and Charpy impact test validation.
| Component | Carbon Steel (Standard) | Low-Temp Service (-46℃) | Corrosive / Sour Service | Duplex / Super Duplex |
|---|---|---|---|---|
| Body / End Adapter | ASTM A216 WCB / A105 | ASTM A352 LCC / A350 LF2 | ASTM A351 CF8M / A182 F316 | A995 4A (2205) / 5A (2507) |
| Trunnion Ball | A105 + 0.075mm ENP / F316 | A350 LF2 + ENP / F316 | A182 F316 / F316L | A182 F51 / F53 / F55 |
| Trunnion Plate & Stem | ASTM A182 F6a / 17-4PH | ASTM A182 F316 / 17-4PH | ASTM A182 F316 / 17-4PH | A182 F51 / Inconel 718 |
| Seat Ring | A105 + ENP / F316 | A350 LF2 + ENP / F316 | ASTM A182 F316 / F316L | A182 F51 / F53 |
| Seat Inserts (Soft) | PTFE / RPTFE / Devlon V | Devlon V / PEEK / Kel-F | Virgin PTFE / PEEK | PEEK / Tungsten Carbide |
| Seat Facing (Metal Hard) | Stellite Hardfacing / HVOF Tungsten Carbide Coating (TCC 0.3mm min, 68-72 HRC) | |||
| Stem Packing | Flexible Graphite with Inconel Wire Reinforcement + PTFE Chevron Rings | |||
| Bolting | ASTM A193 B7 / A194 2H | ASTM A320 L7 / A194 7 | ASTM A193 B8M / A194 8M | A193 B7M / A194 2HM (NACE) |
100% In-House Pressure Testing Before Shipment
Every valve must successfully pass hydrostatic shell test, high/low pressure seat tests, and torque verification on our calibrated digital test consoles.
Hydrostatic Shell Proof Testing
Tested at 1.5 times cold working pressure (CWP) with treated water with corrosion inhibitors. Zero permanent deformation, sweating, or gland leakage permitted.
High & Low Pressure Seat Leakage
Hydrostatic seat test at 1.1× CWP and low-pressure pneumatic air test at 6 bar (80 psi). Bubble-tight Rate A zero leakage verified on water column sensors.
Torque Verification & Mast Calculation
Opening, running, and breakaway torque measured across maximum differential pressure (ΔP) to confirm actuator sizing with a minimum 1.30 safety factor.
Complete Trunnion Mounted Ball Valve Models & Technical Capabilities
Browse TSV's complete portfolio of certified trunnion mounted ball valve models. Engineered to order with customizable trims, metallurgy, pressure ratings, and factory-fitted actuation for mission-critical installations.
ESDV Pneumatic Emergency Shutdown Trunnion Ball Valve
Heavy-duty fail-safe emergency shutdown valve with fast-acting pneumatic scotch-yoke actuator (<2s closure), RTJ flanged ends, and high differential tight shut-off.
DBB High-Pressure Stainless Steel Trunnion Ball Valve
Integral dual block and bleed valve within a single forged block. Features independent upstream/downstream floating seats with central bleed for custody transfer.
DIB-1 Dual Isolation & Bleed Carbon Steel Trunnion Ball Valve
Bidirectional dual isolation valve providing double barrier protection in both flow directions with external body cavity relief safety valve.
Hub-Connection Compact Offshore Trunnion Ball Valve
Ultra-compact clamp hub end connections (Grayloc compatible) engineered for offshore platforms, FPSO manifolds, and subsea tie-in skid packages.
Super Duplex 2507 (A890 5A) Offshore Trunnion Ball Valve
Engineered for aggressive seawater, offshore topside brackish brine, sour gas, and chemical lines requiring superior pitting resistance equivalent (PREN >= 42).
Emergency Rapid Shut-Off (ESD) Heavy Duty Pipeline Ball Valve
High-integrity protection loop valve for refinery fuel gas headers and compressor station isolation with certified quick spring return (<1.5s stroke).
Forged Steel 3-Piece Bolted Body Trunnion Ball Valve
Solid forged body completely eliminating shrinkage defects and porosity. Three-piece split design allows easy in-line field servicing and seal replacement.
2-Piece Flanged Cast Steel Trunnion Mounted Ball Valve
Standard industrial workhorse valve for cross-country hydrocarbon transport, tank farm distribution, and utility steam isolation with double O-ring stem seals.
Full Bore API 6D Pipeline Pigging Trunnion Ball Valve
Unrestricted circular bore strictly matching internal pipe diameter, facilitating passage of smart electronic scrapers, cleaning pigs, and batching spheres.
Gear Operated Large Diameter Heavy Duty Trunnion Ball Valve
Engineered for high line-pressure transmission grids. Equipped with heavy-duty weather-sealed multi-turn bevel/worm gear operator with auxiliary drive input.
Cast Steel Industrial Pipeline Trunnion Ball Valve
Proven split body bolted pipeline valve engineered for general petrochemical processing, refined products handling, and industrial boiler water systems.
Trunnion Ball Valve Technical FAQ
Key engineering questions regarding seat mechanisms, cavity relief, and torque calculations.
In a standard Double Block and Bleed (DBB) valve, both seats have Single Piston Effect (SPE). Line pressure on either side pushes that seat against the ball. If pressure builds up in the body cavity due to thermal expansion, cavity pressure pushes the seats back away from the ball, automatically relieving excess pressure back into the pipeline.
In DIB-1 (Double Isolation and Bleed), both seats have Double Piston Effect (DPE), meaning pressure from either the pipeline OR the cavity forces the seats against the ball. This provides double bi-directional isolation, but requires an external cavity safety relief valve to prevent thermal overpressure rupture.
Devlon V is the preferred material for high-pressure natural gas and hydrocarbons up to Class 2500 and -50℃ to +150℃, offering extreme resistance to explosive decompression (AED).
PEEK is recommended when working temperatures reach +150℃ to +250℃ with moderate abrasives.
For temperatures exceeding +260℃ or media containing severe catalysts, silica sand, or mineral slurry, Metal-to-Metal seats with supersonic flame-sprayed Tungsten Carbide (TCC) or Stellite hardfacing must be specified.
TSV calculates break torque based on full design differential pressure (ΔP = Class rating) taking into account seat material friction coefficient, stem seal drag, and trunnion bearing loading. We apply a minimum 1.30 safety factor for clean liquid service and 1.50 to 1.70 safety factor for dirty dry gas or slurry service to prevent actuator stall under field conditions.
Yes. We provide complete integrated valve automation packages with Scotch Yoke pneumatic actuators, fail-safe spring returns, smart digital positioners (4-20mA HART), solenoid valves, and explosion-proof limit switch boxes. Every automated assembly undergoes dynamic cycle testing and bench stroking calibration before leaving our workshop.
Explore All 5 Ball Valve Sub-Categories
1:1 aligned with TSV factory catalog. Navigate to specialized floating, multi-port, metal-seated, or reduced bore configurations.
Trunnion Mounted Ball Valve
High-pressure pipeline transmission with spring-energized floating seats and double block & bleed (DBB).
Current Series View Page Top ↑Floating Ball Valve
API 608 process plant shut-off with upstream differential sealing and compact two-piece split body.
API 608 Series View Floating Ball Valve →Metal To Metal Seat Ball Valve
HVOF tungsten carbide coating for high-temperature (+550°C) abrasive slurry and catalyst media.
Severe Service View Metal To Metal Seat Ball Valve →Reduced Bore Ball Valve
Economical venturi port pattern reducing operating torque, package footprint, and actuator sizing.
Venturi Port View Reduced Bore Ball Valve →Three-Way Multi-Port Ball Valve
L-port and T-port diversion and mixing ball valve for multi-stream flow routing without multiple valves.
Multi-Port Flow View Three-Way Multi-Port Ball Valve →Configure & Quote Your Trunnion Ball Valve
Select your pipeline parameters below. Our engineering submittal team will generate an approved GA drawing, torque chart, and formal price quotation.