API 6D API 607 ASME B16.34 CE DN300 600LB Stainless Steel SS316/SS304 3PC Flange Trunnion Mounted Fire-Safe Ball Valve for Oil & Gas Petrochemical Applications
I. Product Overview
II. Important Attribute Specifications
A. Dimensional & Pressure-Temperature Parameters
- Port Size: Spans DN50 to DN600 (2” to 24”), with a full-bore design as standard to minimize pressure drop (Cv values up to 1800 for DN600 models). The full-bore configuration also enables pipeline pigging (cleaning) in oil & gas applications.
- Pressure Rating: Class 150 to Class 600 (equivalent to PN20 to PN100), with hydrostatic testing conducted at 1.5× rated pressure for the valve shell and 1.1× rated pressure for seats (per API 598) to ensure leak-tight integrity.
- Temperature Range: Dependent on material and seal selection:
- SS316/SS304 body/ball: -29℃ to 200℃ (standard);up to 450℃ with high-temperature fire-safe seals.
- Fire-safe sealing system: Maintains integrity up to 750℃ during API 607 fire testing (30-minute exposure).
B. Material Composition
- Valve Body (3PC): SS316 (ASTM A182 F316) or SS304 (ASTM A182 F304) stainless steel, offering corrosion resistance against chlorides, acids, and hydrocarbons. The three-piece segments are bolted together for disassembly.
- Ball & Trunnions: Solid SS316 (ASTM A182 F316) ball, precision-ground to a spherical tolerance of ≤0.01mm. Trunnions (upper/lower shafts) are integral to the ball, machined from the same SS316 material and surface-hardened (HRC 30–35) to reduce bearing wear.
- Fire-Safe Sealing System: Dual-layer design:
- Primary seal: Reinforced PTFE (polytetrafluoroethylene) for bubble-tight shut-off (ANSI/FCI Class VI).
- Secondary fire-safe seal: Expanded graphite + metal-to-metal contact (SS316 seat ring) to maintain sealing during fire events (compliant with API 607 7th Edition).
- Valve Stem: SS316 (ASTM A182 F316) with an anti-blowout design, polished to Ra ≤0.4μm to minimize packing friction and fugitive emissions (compliant with ISO 15848-1 Class BH).
- Flanges & Fasteners: Integral ASME B16.5 flanges (raised face, RF) machined from SS316/SS304. Fasteners (bolts/nuts) are ASTM A193 B8M (SS316) for corrosion resistance.
- Gaskets: Spiral-wound (SS316/graphite, ASME B16.20) for leak-tight flange connections under pressure/temperature fluctuations.
C. Connection & Operational Features
- Connection Type: Flange (ASME B16.5), compatible with standard pipeline flanges to simplify installation and retrofitting.
- Operation Modes:
- Manual: Worm gear operator (torque reduction 5–10×) for Class 300+ or DN200+ models; lever operator for smaller sizes.
- Automated: Pneumatic (double-acting/spring-return, 4–8 bar air supply) or electric (4–20mA control signal, IP67 enclosure) actuators, mounted via ISO 5211 flanges.
- Functional Attributes:
- Trunnion-mounted (fixed-ball) structure for high-pressure stability.
- Three-piece body for in-line maintenance.
- Fire-safe design (API 607) for flammable media applications.
- Bidirectional sealing (reliable shut-off in both flow directions).
- Leakage Class: ANSI/FCI Class VI (bubble-tight) for standard service; Class IV for high-temperature fire-safe operation.
D. Certifications & Compliance
- Design & Performance Standards: API 6D, API 607 (7th Ed.), ASME B16.34, ASME B16.5, API 598, ISO 6283 (Cv testing).
- Quality & Safety Certifications: ISO 9001 (quality management), CE (PED 2014/68/EU), ATEX/IECEx (optional, for explosive atmospheres).
- Environmental Compliance: ISO 15848-1 (fugitive emissions), REACH (EU chemical regulations).

III. Feature Description
A. 3PC Body Design: In-Line Maintenance Efficiency
B. Trunnion-Mounted Structure: High-Pressure Stability
C. API 607 Fire-Safe Sealing: Critical Safety Assurance
D. Stainless Steel Construction: Corrosion Resistance & Cleanliness
IV. Manufacturing Process
A. Raw Material Inspection & Preparation
- Stainless Steel Verification: SS316/SS304 bar stock undergoes spectral analysis (XRF) to confirm chemical composition (e.g., 16–18% Cr, 2–3% Mo for SS316) and ultrasonic testing (UT) to detect internal defects (porosity, cracks). Material Test Reports (MTRs) are generated for every batch.
- Seal Material Testing: Reinforced PTFE is tested for hardness (Shore D 55–65) and thermal stability; expanded graphite is evaluated for expansion rate (≥200% at 750℃) to ensure API 607 compliance.
- Fastener Validation: ASTM A193 B8M bolts undergo tensile strength testing (≥550MPa) to confirm load capacity.
B. Valve Body & Ball Fabrication
- 3PC Body Machining: SS316/SS304 bar stock is cut into three segments (two end caps, one middle body) and machined via 5-axis CNC centers. Flange faces are precision-machined to ASME B16.5 flatness (≤0.05mm/m) and surface finish (Ra ≤3.2μm) for proper gasket seating. The middle body’s trunnion bearing bores are honed to ±0.02mm tolerance to ensure ball alignment.
- Ball & Trunnion Processing: The SS316 ball is turned, then ground with a spherical grinder to achieve a surface finish of Ra ≤0.2μm (critical for bubble-tight sealing). Trunnions are machined integrally with the ball, then heat-treated and polished to reduce bearing friction.
- Seat Ring Manufacturing: SS316 seat rings are machined, then fitted with reinforced PTFE and expanded graphite layers via compression molding.
C. Assembly & Actuator Integration
- Trunnion & Ball Installation: The ball (with integral trunnions) is inserted into the middle body, and bearings (PTFE-impregnated bronze) are pressed into the trunnion bores.
- Seal & Body Assembly: Seat rings are installed in the end caps, then the three body segments are bolted together with controlled torque (per ASME B18.2.1) to ensure uniform seal compression.
- Actuator Mounting: Manual/worm gear actuators are attached via ISO 5211 flanges, with laser alignment to ensure stem-trunnion coaxiality (runout ≤0.05mm). Automated actuators (pneumatic/electric) are calibrated to 4–20mA signals, with limit switches set to trigger at fully open/closed positions.
D. Quality Testing & Certification
- Hydrostatic Testing: Per API 598—shell test (1.5× rated pressure, 30 minutes) for body integrity; seat test (1.1× rated pressure, 15 minutes) for leak-tightness (≤1 bubble/minute for Class VI).
- Fire Testing: Random samples undergo API 607 testing (30-minute 750℃ exposure + post-fire leakage assessment).
- Operational Testing: 100 open-close cycles to verify torque consistency and actuation speed (3–5 seconds for pneumatic models).
- Non-Destructive Testing (NDT): Liquid penetrant testing (PT) for flange welds; magnetic particle testing (MPI) for trunnions.
V. Product Advantages
A. Reduced Maintenance Costs & Downtime
B. High-Pressure Stability & Low Torque
C. Safety & Regulatory Compliance
D. Corrosion Resistance & Hygienic Compatibility
VI. Product Applications
A. Oil & Gas Industry
- Upstream Production: DN50–DN200 Class 600 valves control wellhead crude oil flow, with trunnion design handling high-pressure reservoir fluids and SS316 resisting sulfur-induced corrosion (compliant with NACE MR0175, optional).
- Midstream Transmission: DN200–DN600 Class 300 valves regulate natural gas flow in cross-country pipelines, with full-bore design enabling pigging and fire-safe sealing mitigating pipeline leak risks.
- Downstream Refining: DN100–DN300 Class 600 valves manage gasoline/diesel blending, with 3PC design enabling quick seal replacement during scheduled shutdowns.
B. Petrochemical & Chemical Industry
- Petrochemical Reactors: DN50–DN200 Class 300 valves control feedstock (ethylene, propylene) flow, with SS316 resisting chemical corrosion and fire-safe design protecting against reactor fire hazards.
- Chemical Processing: DN25–DN150 Class 150 valves handle acids (hydrochloric, sulfuric) and solvents (methanol), with Class VI leakage preventing environmental contamination.
C. Power Generation
- Thermal Power Plants: DN100–DN300 Class 300 valves regulate steam condensate flow, with SS316 resisting corrosion from treated water and trunnion design handling cyclic pressure fluctuations.
- Nuclear Power Plants: DN50–DN200 Class 600 valves control service water flow, with 3PC design enabling in-line maintenance (critical for limited-shutdown facilities).
D. Food & Pharmaceutical Industry
- Food Processing: DN25–DN100 Class 150 valves manage high-purity water and food-grade fluids (juices, dairy), with SS316’s hygienic surface complying with FDA standards.
- Pharmaceutical Manufacturing: DN15–DN50 Class 150 valves control API (active pharmaceutical ingredient) flow, with Class VI leakage preventing product contamination.
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