Flanged Metal-seat Butterfly Valve D343HD343F

Flanged Metal-seat Butterfly Valve D343HD343F Purpose 

Butterfly valve for the petroleum, chemical, food, medicine,metallurgy, shipbuilding, paper, industrial environmental protec tion water supply and drainage, on high-level pipeline architecture can be in a variety of corrosive,non-corrosive gases,liquids, fluids and solid powder loaded pipelines and containers for the head stock or adjust the medium flow purposes.

Flanged Metal-seat Butterfly Valve D343HD343F Performance parameters

DN(mm) Nominal diameter		50~2000
PN(MPa) Nominal pressure		1.0	2.5	150LB
Testing pressure	Shell	1.5	3.75	4.0
	Sealing	1.1	2.75	3.0
Working temperature（℃）		-40~570
Suitable mediums		Water, sea water, air, oils,acids alkali etc

Flanged Metal-seat Butterfly Valve D343HD343F Definition and Components

1.1 What are D343H/D343F Valves?

D343H/D343F are triple eccentric flanged metal-seated butterfly valves designed for extreme service conditions where resilient-seated valves would fail.

Code Breakdown:

• D: Butterfly Valve
• 3: Driving Mode (Manual Gear Operation)
• 4: Flanged Connection
• 3: Triple Offset/Triple Eccentric Design
• H/F: Seat Material Designation
• H: Stainless Steel or Hard-faced Metal Seat
• F: Special Alloy Seat (e.g., Stellite, Inconel, Monel)

1.2 The Triple Eccentric Design Principle

• Eccentricity 1: Stem offset from disc centerline
• Eccentricity 2: Stem offset from valve centerline
• Eccentricity 3: Seat cone angle offset (typically 5-10°)

RESULT: Disc lifts completely away from seat during rotation, achieving ZERO CONTACT until final closure.

1.3 Main Components

Component	Material/Description	Critical Function
1. Valve Body	ASTM A216 WCB/WCC, A351 CF8/CF8M, A995 Duplex	Pressure-containing structure with precision-machined seat pocket
2. Disc	Base material matching body + Hard-facing (Stellite 6, WC, CrC)	Triple-offset design with conical sealing surface
3. Metal Seat Ring	• D343H: 304SS, 316SS, 17-4PH	Replaceable precision-machined ring providing primary sealing surface
	• D343F: Stellite 6/21, Inconel 625, Monel K500
4. Stem	Forged 17-4PH, 316SS, or high-strength alloys	Triple-offset positioning, transmits torque without bending
5. Bearing System	Self-lubricating bronze/PTFE, needle roller bearings	Supports eccentric loads, ensures smooth operation
6. Sealing System	• Stem seals: Spring-energized PTFE/Graphite	Secondary sealing, fugitive emission control
	• Body seals: Spiral-wound gaskets
7. Actuator Mount	ISO 5211 standard mounting pad	Interface for gear operators or powered actuators

Role, Characteristics, and Application Scenarios of Flanged Metal-seat Butterfly Valve D343HD343F in Pipelines

2.1 Pipeline Functions

Absolute Isolation: Zero-leakage shutoff in both directions

High-Temperature Containment: Reliable operation where elastomers fail

Fire-Safe Performance: Inherent metal-to-metal sealing

Abrasive/Corrosive Service: Resists particle erosion and chemical attack

Cryogenic to Ultra-High Temperature: Wide operational range (-196°C to +815°C)

2.2 Operational Features

Feature	Technical Advantage	Operational Benefit
Zero Friction Design	No seat contact during 89° of rotation	Minimal torque, extended cycle life (>100,000 cycles)
Bidirectional Sealing	Symmetrical disc/seat geometry	Equal performance in either flow direction
Thermal Compensation	Differential expansion accommodation	Maintains seal across wide temperature swings
Fire-Safe by Design	All-metal construction	No soft parts to degrade in fire (API 607/6FA compliant)
Low Maintenance	Replaceable seat ring design	Seat replacement without valve removal
High Pressure Capability	Wedge-type metal sealing	Suitable for Class 1500 (PN250) applications

2.3 Application Scenario Diagram

Critical Application Industries:

Industry	Specific Application	Valve Selection Rationale
Oil & Gas Refining	FCCU, Coker, Reformer units	Withstands 400-800°C temperatures, catalyst abrasion
Petrochemical	Ethylene cracker, steam cracking	Thermal cycling capability, zero leakage
Power Generation	Main steam, turbine bypass	High-pressure steam (Class 600-1500), fire safety
Chemical Processing	High-temperature reactors	Corrosion resistance to acids/alkalis
LNG & Cryogenics	LNG loading, cryogenic storage	Low-temperature embrittlement resistance
Steel & Metals	Coke oven gas, blast furnace	Abrasive dust handling, high temperatures

Flanged Metal-seat Butterfly Valve D343HD343F Standards: Materials, Design, and Connections

3.1 Material Standards

Component	D343H Standards	D343F Standards
Body & Disc	ASTM A216 WCB, A351 CF8	ASTM A217 WC6/WC9, A351 CF8M
Seat Ring	ASTM A182 F304/F316	AWS A5.13 Co-Cr alloys, ASTM B564 Inconel
Stem	ASTM A564 630 (17-4PH)	ASTM A564 660 (Inconel 718)
Hard-facing	-	AWS ERCoCr-A (Stellite 6), Tungsten Carbide
Fasteners	ASTM A193 B7/B16	ASTM A193 B8M, A320 L7/L43

3.2 Butterfly Valve for Water Design Standards

Standard	Title	Application
API 609	Butterfly Valves: Double Flanged, Lug- and Wafer-Type	Primary design standard
API 607	Fire Test for Quarter-Turn Valves	Fire-safe certification
API 6FA	Fire Test for Valves	More rigorous fire testing
ISO 17292	Metal butterfly valves	International design standard
MSS SP-68	High Pressure Butterfly Valves	High-pressure applications
ASME B16.34	Valve Design	Pressure-temperature ratings

3.3 Connection Standards

Flange Standard	Pressure Classes	Face Type	Application
ASME B16.5	Class 150-600	RF, RTJ	General process industry
ASME B16.47	Class 75-900	RF, RTJ	Large diameter pipelines
EN 1092-1	PN10-PN100	Type 11, 13, 14	European/international
JIS B2220	5K-20K	RF	Asian markets
ISO 7005-1	Multiple	RF	Global projects

Face-to-Face Dimensions: API 609 Table 2 / ISO 5752 Series 20

How to Select Flanged Metal-seat Butterfly Valve D343HD343F

4.1 Technical Specification Development

4.2 Fire protection water supply Critical Specification Elements

Service Conditions (Must Specify):

• Fluid: Composition, phase, abrasives content, corrosion factors
• Temperature: Min/operating/max, thermal cycling rate
• Pressure: Operating/design/test, pressure surges
• Cycling: Frequency (cycles/year), emergency shutdown requirements
• Environmental: Ambient conditions, hazardous area classification

Performance Requirements:

• Leakage Class: ANSI/FCI 70-2 Class IV/V/VI or zero leakage
• Fire Test: API 607 (30 min) or API 6FA (30 min)
• Fugitive Emissions: ISO 15848-1 (Class AH/BH) or TA-Luft
• Cycle Life: Minimum guaranteed cycles (e.g., 50,000 full cycles)
• Operation Torque: Maximum allowable operating/breakaway torque

Material Selection Guide:

Service Condition	Recommended Seat Material	Hard-facing Required	Notes
High Temperature Steam	316SS, 17-4PH	Yes (Stellite 6)	For >400°C service
Abrasive Catalyst	Stellite 21	Yes (WC-Co)	HRC >55 for severe abrasion
Corrosive Chemicals	Inconel 625, Hastelloy C	Optional	CRA (Corrosion Resistant Alloy)
Cryogenic LNG	Monel, Invar 36	No	Low temp impact resistance
Sour Service (H2S)	316SS with NACE	Yes	NACE MR0175/ISO 15156 compliant

4.3 Fire Protection System Supplier Qualification Process

Step 1: Technical Capability Assessment

• Review design calculations and FEA reports
• Verify manufacturing facilities for precision machining
• Check hard-facing capabilities (automated welding equipment)
• Assess testing facilities (high-pressure, high-temperature testing)

Step 2: Quality System Verification

• Mandatory Certifications: API Q1, ISO 9001
• Special Certifications: API 6D, PED 2014/68/EU (Category IV if needed)
• NDT Capabilities: UT, RT, PT, MPI with certified personnel
• Traceability: Full material traceability from melt to final assembly

Step 3: Performance History Review

• Request minimum 3 references for similar service
• Review failure reports and corrective actions
• Verify experience with your specific service conditions

4.4 Commercial Evaluation Factors

Factor	Weight	Evaluation Criteria
Technical Compliance	35%	Meets all specifications, certified designs
Quality & Reliability	25%	Track record, warranty terms, failure rates
Total Cost of Ownership	20%	Initial cost + maintenance + expected lifecycle
Delivery & Flexibility	15%	Lead time, responsiveness to changes
Technical Support	5%	Engineering support, documentation quality

Pre-Shipment Inspection for Export Flanged Metal-seat Butterfly Valve D343HD343F and Key Considerations

5.1 Comprehensive Inspection Protocol

Phase 1: Documentation Review

REQUIRED DOCUMENTS CHECKLIST:

✓ Material Certificates (EN 10204 3.1/3.2)

✓ Heat Treatment Charts

✓ NDT Reports (UT, RT, PT, MPI)

✓ Hardness Test Reports

✓ Dimensional Inspection Reports

✓ Pressure Test Certificates

✓ Fire Test Certificates (API 607/6FA)

✓ Third-Party Inspection Reports

✓ Final Data Book with all records

Phase 2: Visual Inspection

Inspection Area	Acceptance Criteria	Tools/Methods
Surface Finish	Ra ≤ 3.2 μm on sealing surfaces	Surface roughness tester
Hard-facing Quality	No cracks, uniform thickness	Dye penetrant, visual
Markings	Permanent, per MSS SP-25	Visual verification
Coating/Painting	Uniform, specified thickness	Coating thickness gauge
Assembly Quality	Clean, no foreign material	Internal borescope inspection

Phase 3: Dimensional Verification

Critical Dimensions:

• Seat cone angle: ±0.25° tolerance
• Eccentricity dimensions: ±0.1mm tolerance
• Face-to-face: Per API 609 Table 2
• Flange dimensions: Per specified standard
• Measurement Tools: CMM, height gauges, precision protractors

Phase 4: Material Verification

• Positive Material Identification (PMI): XRF analyzer for alloy verification
• Hardness Testing: Brinell/Rockwell at multiple locations
• Hard-facing Thickness: Ultrasonic thickness gauge

Phase 5: Performance Testing

Pressure Testing (Per API 598):

SHELL TEST:

• Pressure: 1.5 × PN rating
• Medium: Water
• Duration: Minimum per API 598 (based on size)
• Acceptance: No visible leakage, no permanent deformation

SEAT TEST:

• Low Pressure: Air at 0.6 MPa, soap bubble test (zero bubbles)
• High Pressure: 1.1 × PN, both directions
• High-Pressure Gas Test: Optional, for critical service

Operational Testing:

• Torque Test: Measure opening/closing torque vs. angle
• Cycle Test: 3-5 complete cycles minimum
• Limit Switch Test: Verify open/close position accuracy
• Stem Seal Test: Fugitive emission test if specified

Special Testing (If Specified):

• Fire Test Simulation: Verify metal-to-metal contact after soft seal removal
• Cryogenic Test: For LNG applications (-196°C)
• High-Temperature Test: Operational test at elevated temperature

5.2 Special Considerations for Metal-Seated Valves

Seat Lapping Verification:

• Contact pattern ≥85% of seat width
• Uniform contact around entire circumference
• No gaps or discontinuities

Hard-facing Quality Control:

• No porosity or inclusions (per AWS standards)
• Minimum hardness: HRC 40 for Stellite, HRC 55 for tungsten carbide
• Bond strength: No delamination during bend tests

Thermal Distortion Check:

• Verify disc/seat clearance at room and elevated temperatures
• Ensure no binding during thermal cycling simulation

5.3 Export Preparation Protocol

Cleaning & Preservation:

• Complete Internal Cleaning: Remove all machining debris
• Degreasing: Remove all oils and contaminants
• Drying: Complete moisture removal after hydrotest
• VCI Application: Volatile Corrosion Inhibitor application
• Desiccant Placement: Calculate based on internal volume
• Desiccant Quantity (g) = Internal Volume (L) × 20

Protective Packaging:

For Machined Surfaces:

• Flange faces: 3mm plastic/metal covers bolted in place
• Stem ends: Plastic caps with retaining chains
• Actuator mounting: Protective covers

Internal Protection:

• Disc secured in 10-15° open position to prevent seat galling
• VCI emitters placed inside valve body
• Moisture indicators visible through inspection ports

External Crating:

• Wooden Crates: ISPM-15 compliant, 15mm minimum thickness
• Internal Blocking: Prevent movement during transit
• Weather Protection: Polyethylene lining for moisture barrier
• Lifting Points: Clearly marked, rated for valve weight

Marking Requirements:

Crate Marking (All Four Sides):

[CONSIGNEE]

[PROJECT NAME]

[VALVE SERIAL NUMBER]

[GROSS WEIGHT: XXX kg]

[NET WEIGHT: XXX kg]

[DIMENSIONS: L×W×H]

[HANDLING SYMBOLS]

[CENTER OF GRAVITY]

Valve Body Marking (Per MSS SP-25):

Manufacturer's name/trademark

Pressure class designation

Material designation

Temperature rating

Directional arrow (if applicable)

Serial number

Heat numbers for pressure parts

Documentation Package:

Shipping Documents:

Commercial Invoice (3 copies)

Packing List (detailed, per crate)

Bill of Lading/Air Waybill

Certificate of Origin

Insurance Certificate

Export Declaration

Technical Documents (Waterproof Pouch):

Data Book containing:

Manufacturing Data Report

Material Certificates (EN 10204 3.1)

NDT Reports

Test Reports (pressure, functional)

Inspection Release Certificate

Certificates:

API Monogram Certificate

Fire Test Certificate (if applicable)

CE Declaration of Conformity

NACE Compliance Certificate

User Documentation:

Installation, Operation, Maintenance Manual

Spare Parts List with drawings

Recommended Maintenance Schedule

5.4 Third-Party Inspection Requirements

For Critical Service Valves:

Inspection Agency: DNV, BV, SGS, Lloyd's Register

Witness Points (Typical):

Final assembly and dimensional check

Pressure testing (shell and seat)

Functional testing

Preservation and packing

Hold Points:

Material certification review

NDT completion

Final documentation review

Inspection Release Certificate Must Include:

Inspector's name and qualifications

Dates of inspection activities

List of witnessed tests

Non-conformities and resolutions

Final release statement

5.5 Common Defects to Prevent

Defect	Prevention Method	Detection Method
Seat Galling	Proper lubrication during assembly, correct materials	Torque monitoring, visual inspection
Hard-facing Cracks	Preheat/interpass temp control, proper weld procedure	Dye penetrant testing, UT
Dimensional Errors	CMM verification, first article inspection	Precision measurement
Cleaning Issues	Multi-stage cleaning process	White glove inspection, borescope
Preservation Failures	Proper VCI application, desiccant calculation	Humidity indicator monitoring

5.6 Final Release Checklist

Before shipping authorization:

All tests completed and documented

Non-conformities closed with evidence

Documentation package complete and accurate

Preservation and packaging verified

Marking and labeling correct

Weight and dimensions recorded

Shipping documents prepared

Insurance arranged

Carrier instructions provided

Final photographic record completed

Flanged Metal-seat Butterfly Valve D343HD343F Main dimensions（mm）   

DN	L	Flanged Size and Bolting Specification
		1.6Mpa				2.5MPa
		D	D1	D2	N -Ф d	D	D1	D2	N -Ф d
50	108	165	125	102	4-Ф18	165	125	102	4-Ф18
65	112	185	145	122	8-Ф18	185	145	120	8-Ф18
80	114	200	160	138	8-Ф18	200	160	135	8-Ф18
100	127	220	180	158	8-Ф18	235	190	160	8-Ф22
125	140	250	210	188	8-Ф18	270	220	188	8-Ф26
150	140	285	240	212	8-Ф22	300	250	218	8-Ф26
200	152	340	295	268	12-Ф22	360	310	278	12-Ф26
250	165	405	355	320	12-Ф26	425	370	335	12-Ф30
300	178	460	410	378	12-Ф26	485	430	395	16-Ф30
350	190	520	470	438	16-Ф30	555	490	450	16-Ф33
400	216	580	525	490	16-Ф30	620	550	505	16-Ф36
450	222	640	585	550	20-Ф30	670	600	555	20-Ф36
500	229	715	650	610	20-Ф33	730	660	615	20-Ф36
600	267	840	770	725	20-Ф36	845	770	720	20-Ф39
700	292	910	840	795	24-Ф36	960	875	820	24-Ф42
800	318	1025	950	900	24-Ф39	1085	990	930	24-Ф48
900	330	1125	1050	1000	28-Ф39	1185	1090	1030	28-Ф48
1000	410	1255	1170	1115	28-Ф42	1320	1210	1140	28-Ф56
1200	470	1485	1390	1330	32-Ф48	1530	1420	1350	32-Ф56
1400	530	1685	1590	1530	36-Ф48	1755	1640	1560	36-Ф62
1600	600	1930	1820	1750	40-Ф56	1975	1860	1780	40-Ф62
1800	670	2130	2020	1950	44-Ф56	2195	2070	1985	44-Ф70
2000	760	2345	2230	2150	48-Ф62	2425	2300	2210	48-Ф70

Note:1. Other specifications and flange standards are available upon request.

2.Design and specifications are subject to change without prior notice