Triple Offset Butterfly Valves—4″ 150LB Lugged

Description

Triple Offset Butterfly Valve

4″ (DN100) Class 150 Lugged

Technical Data Sheet

1. Product Overview

The Triple Offset Butterfly Valve is a high-performance metal-seated butterfly valve featuring a unique triple offset geometry. Offset 1: the shaft is offset from the center of the sealing face. Offset 2: the shaft is offset from the pipe centerline. Offset 3: the conical sealing surface axis is inclined. This design ensures that the disc disengages completely from the seat the instant it opens, eliminating friction and delivering low-torque, wear-free operation. This model is a 4-inch, Class 150 rated, lugged-body valve with a metal/graphite laminated seat, providing bi-directional bubble-tight shut-off (zero leakage). It is widely used for on-off and modulating service with steam, high-temperature gases, hot oils, chemical media, and mildly corrosive fluids at moderate pressures.

2. Design Features & Benefits

Triple Offset Geometry: Unique conical sealing pair ensures friction-free operation at full open/close and zero leakage (per ISO 5208 Rate A).
Metal Seated: The seat and seal ring are a laminated stainless steel and graphite composite, providing high-temperature resistance, erosion resistance, and long service life.
Bi-directional Seal: Bubble-tight shut-off in both flow directions.
Fire-Safe: Metal seal ring and graphite gaskets form an inherent fire-safe construction; certification to API 607/6FA is available.
Low Operating Torque: Friction-free design significantly reduces actuator torque, enabling the use of more compact actuators.
Integral Shaft: Blowout-proof stem design ensures safety and reliability.
Multiple Drive Options: Suited for lever handles (small sizes), gearboxes, electric, and pneumatic actuators; top mounting flange conforms to ISO 5211.
Replaceable Seal Ring: The seal ring is fixed to the disc by a retainer ring, allowing on-site replacement without special tools.
Lugged Connection: The body has threaded lugs, allowing single-side pipeline disassembly and making it suitable for dead-end service or frequent dismantling.
3. Technical Parameters

Item Specification
Nominal Diameter 4″ (DN100)
Pressure Class Class 150 (PN20)
Connection Type Lugged
Operating Temperature -20°F to 797°F (-29°C to 425°C) depending on materials; high-temp design up to 1022°F (550°C)
Leakage Class Zero Leakage (ISO 5208 Rate A / API 598)
Body Material WCB (Carbon Steel), CF8M (SS316), CF8 (SS304), Duplex Stainless Steel, Monel, etc.
Disc Material WCB, CF8M, CF8, Duplex (with hardfacing/nitriding)
Seal Ring Material Laminated Stainless Steel + Graphite (SS316+Graphite)
Stem Material A182 F6a (13Cr), A276 316, 17-4PH, Monel
Body Seat Stainless steel integrally overlaid with Stellite Gr.6 or hard alloy
Packing Flexible Graphite (standard), PTFE
Operation Gearbox (standard), Lever (optional), Electric/Pneumatic Actuator
Surface Treatment Painted body (standard RAL 5015), Stainless Steel pickled
4. Bill of Materials

No. Component Standard Material Optional Material
1 Body ASTM A216 WCB CF8M, CF8, Duplex
2 Disc ASTM A351 CF8M + Nitrided WCB, Duplex
3 Seal Ring SS316 + Flexible Graphite Laminate Exotic alloys
4 Body Seat Integral Stellite Gr.6 overlay Hardfacing
5 Stem ASTM A276 410 (13Cr) A276 316, 17-4PH
6 Retainer Ring ASTM A351 CF8M Duplex
7 Retainer Screws A193 B8M
8 Packing Flexible Graphite Rings PTFE
9 Bottom Cover Carbon Steel / Stainless Steel
10 Gearbox Ductile Iron / Carbon Steel, IP65
5. Dimensions & Weights (4″ Class 150 Lugged)

Parameter Value
Face-to-Face (L) 46 mm (conforms to API 609 Table 2, EN 558 Series 16)
Lug Drilling Matches ASME B16.5 Class 150 Flange (4″ flange O.D. approx. 228.6 mm, bolt circle 190.5 mm, 8-19 mm holes)
Lug Quantity & Thread 8 lugs with M16 or 5/8″-11 UNC threaded through holes (customizable)
Height (H) – Center to Top of Stem Approx. 210 mm (with gearbox)
Max. Opening Diameter (D) Approx. 190 mm (disc swing clearance, to be confirmed)
Actuator Mounting Flange ISO 5211 F10 (square 102×102 mm, bolt circle 85 mm)
Approx. Weight (with gearbox) 28 kg (62 lbs)
Note: Dimensions are typical values; refer to certified drawings for exact figures. Handwheel diameter approx. 200 mm.

6. Applicable Standards

Item Standard
Design & Manufacturing API 609 (Category B), EN 593, ASME B16.34
Face-to-Face API 609 Table 2 / EN 558-1 Series 16 / ISO 5752
Flange Compatibility ASME B16.5 Class 150 (Lug holes drilled to match)
Top Mounting Flange ISO 5211
Inspection & Testing API 598 / ISO 5208 (Rate A – Zero Leakage)
Pressure-Temperature Ratings ASME B16.34
Fire-Safe (Optional) API 607 / API 6FA
Materials Per ASTM / ASME standards
7. Pressure-Temperature Ratings (Reference: WCB Body / SS+Graphite Seat)

Temperature -20°F to 100°F 200°F 400°F 570°F 750°F
Temperature (°C) -29 to 38 100 200 300 400
Max. Operating Pressure (bar) 19.6 17.2 14.7 13.1 11.8
Based on ASME B16.34 Class 150 standard ratings; for reference only, final values depend on valve construction.

8. Installation & Maintenance Instructions

Install the valve with the disc in a partially open position (approx. 10°) to avoid damage to the sealing surfaces.
Lugged installation: Studs pass through the pipe flange and are threaded into the valve lugs. Use stud bolts and nuts; tighten diagonally and evenly.
Ensure the pipe flange inner diameter is large enough to allow the disc to fully open.
The valve may be used for dead-end service; ensure the downstream pipeline is designed to handle full pressure when disconnected.
For maintenance, if the seal ring is worn, remove the retainer ring and replace the seal ring assembly without removing the valve from the pipeline.
Every 6 months of operation, inspect the packing and bolt preload; adjust or replace as necessary.
9. Ordering Information

Please provide the following information for accurate selection:

Size: 4″ Class 150
Connection: Lugged
Body Material: WCB / CF8M
Seal Material: SS316+Graphite
Operation: Gearbox / Electric / Pneumatic
Media, Operating Temperature & Pressure
Special certifications required (e.g., API 607 Fire-Safe, NACE MR0175, SIL, etc.)
Ordering Example: TOBV-L-4″-150-WCB-CF8M-GRAPH-GB
Designates a Triple Offset Butterfly Valve, 4″, Class 150, Lugged, WCB body, CF8M disc, Graphite laminated seal, with gearbox.