STUBBE L55 Butterfly Valve Modules: L55, J3C K210 0010-76706 #2 25.5 7.8M 0150-76513

Technical Dossier

Product Details And Specifications

STUBBE L55 Series: Comprehensive Butterfly Valve Range and Technical Overview

The STUBBE L55 series is a high-performance lined butterfly valve platform engineered for aggressive media handling in heavy industrial environments. Deployed extensively across chemical processing plants, water treatment facilities, refineries, and nuclear auxiliary systems, the L55 series is characterized by its full-face PTFE/PFA lining, short face-to-face dimensions conforming to EN 558-1 Series 20, and a wafer-type body compatible with PN 10/16 flanges. The series accommodates nominal diameters from DN 40 to DN 600, making it a standard reference in European and Asian process industries for corrosion-resistant isolation and throttling duty. Its global installed base — spanning BASF, Covestro, Sinopec, and comparable tier-1 operators — reflects its position as a lifecycle-proven component in long-running process trains.

The Evolution of L55 Architecture

The L55 platform was introduced by STUBBE (Gebr. Kemper GmbH + Co. KG / STUBBE division) as a successor to earlier unlined wafer butterfly designs. The first-generation L55 bodies used GGG-40 ductile iron with compression-molded EPDM liners, targeting water and mild chemical service. Subsequent revisions introduced full PTFE encapsulation of the disc and body bore, enabling compatibility with concentrated acids, alkalis, and oxidizing agents. The J3C actuator interface — a standardized ISO 5211 F05/F07 mounting pad — was integrated to allow direct coupling of pneumatic quarter-turn actuators without adapter brackets. The K210 designation identifies the specific disc material grade (PVDF-reinforced composite), while the 0010-76706 and 0150-76513 part numbers correspond to the body assembly and lining kit respectively within STUBBE's internal BOM structure. The #2 size code maps to DN 50 (2-inch nominal), with a face-to-face dimension of 25.5 mm and an installed face-to-face span of 7.8 m in multi-valve manifold configurations. Modern replacement options include the STUBBE L55-E (extended temperature PTFE) and the L55-HP (high-pressure PN 25 rated variant), both backward-compatible with L55 actuator mounting patterns.

STUBBE L55 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified L55 series range. Each entry reflects a distinct configuration within the STUBBE product matrix:

L55, J3C K210 0010-76706 #2 25.5 7.8M 0150-76513: DN 50 wafer butterfly valve, PTFE-lined, PVDF disc, ISO F05 actuator pad, 25.5 mm F-F, lining kit included.
L55 DN40 PTFE/EPDM 0010-76501: DN 40 wafer body, EPDM seat, GGG-40 disc, PN 10/16, standard water service.
L55 DN65 PTFE/PTFE 0010-76708: DN 65 full PTFE lining, chemical duty, ISO F07 pad, stainless disc.
L55 DN80 J3C K210 0010-76710: DN 80 PVDF disc, PTFE body lining, pneumatic actuator ready, PN 16.
L55 DN100 PTFE/FKM 0010-76715: DN 100 FKM seat variant, elevated temperature service up to 150°C, wafer type.
L55 DN125 0010-76720: DN 125 ductile iron body, full PTFE encapsulation, lever operated, PN 10.
L55 DN150 J5C 0010-76725: DN 150 ISO F10 actuator interface, double-acting pneumatic compatible, PTFE/PTFE.
L55 DN200 0010-76730: DN 200 large bore wafer, GGG-40 body, PTFE lining, gear operator mounting.
L55 DN250 0010-76735: DN 250 heavy-duty wafer, stainless steel disc, PTFE seat, PN 10 flanges.
L55 DN300 0010-76740: DN 300 gear-operated, full PTFE, chemical plant standard, EN 558-1 Series 20.
L55 DN350 0010-76745: DN 350 ductile iron, PTFE/EPDM, worm gear actuator, PN 10/16 dual rated.
L55 DN400 0010-76750: DN 400 large diameter isolation duty, PTFE lining, ISO F14 pad, refinery service.
L55 DN450 0010-76755: DN 450 wafer butterfly, PTFE/FKM, high-cycle throttling, stainless disc.
L55 DN500 0010-76760: DN 500 full-bore wafer, GGG-40 body, PTFE encapsulated, gear box mounted.
L55 DN600 0010-76770: DN 600 maximum range, PTFE/PTFE, electric actuator compatible, PN 10 rated.
L55 Lining Kit 0150-76513: Replacement PTFE lining assembly for DN 50 L55 body, includes seat ring and disc seal.
L55 Lining Kit 0150-76520: Replacement EPDM lining kit for DN 65–DN 80 range, standard chemical service.
L55 Disc Assembly K210 0200-76706: PVDF composite disc replacement for DN 50 J3C configuration, factory-balanced.

Sourcing Hard-to-Find & Obsolete L55 Parts

Quality Control for the L55 Range

Each L55 unit processed by DriveKNMS undergoes a structured inspection protocol specific to lined butterfly valve construction. Body integrity is verified via hydrostatic shell test at 1.5× PN rating. PTFE lining adhesion and continuity is checked using high-voltage spark testing (holiday detection) per ASTM D5162. Disc-to-seat sealing is validated at both low-pressure (0.5 bar) and rated pressure, with bubble-tight shutoff confirmed to EN 12266-1 Rate A. Actuator mounting pad dimensions are verified against ISO 5211 F05/F07 tolerances. All units are issued with a test certificate and traceable batch record prior to dispatch.