Lug Butterfly Valve Type 038 Gearbox GGG40 PN16

  Datasheet (PDF)

The Type 038 Lug-style ductile iron butterfly valve with manual gearbox is engineered for industrial flow isolation, throttling, and end-of-line dead-end service. Designed for dependable bi-directional shut-off in water distribution networks, industrial utilities, and process piping systems, this valve provides bubble-tight sealing up to 16 bar working pressure. Threaded metric lug ears enable safe downstream dismantling under full upstream line pressure.

Materials and standards

The valve incorporates high-integrity metallurgy and durable elastomer seals engineered to withstand severe mechanical and environmental stresses. Every component conforms strictly to harmonised European industrial valve dimensions and material testing requirements.

• Body construction: GGG40 ductile iron protected by a high-adhesion Rilsan coating for corrosion and abrasion resistance
• Disc material: Aluminium-bronze delivering superior wear resistance, low friction, and protection against cavitation and saline media
• Drive stem: One-piece stainless steel DIN 1.4021 with square drive profile eliminating disc play
• Seat liner options: EPDM for drinking water and neutral fluids, or FKM for hydrocarbons and aggressive process media
• Standard dimensions: Face-to-face length according to EN 558 row 20 and actuator mounting flange to DIN EN ISO 5211

Technical specifications

The Type 038 butterfly valve delivers stable flow regulation and bi-directional shut-off across a continuous pressure envelope of PN16. Its integrated worm gearbox guarantees smooth operation and prevents dynamic closing shocks during pipeline operation.

Operating torque is managed by a heavy-duty worm gear mechanism equipped with a manual handwheel, which provides self-locking positioning at intermediate opening angles for accurate flow throttling. The robust internal drive interface ensures concentric disc movement without shaft misalignment or hysteresis. The upper mounting flange adheres strictly to DIN EN ISO 5211 standards, enabling direct mechanical retrofitting of quarter-turn electric or pneumatic actuators operating across 90 degrees without modifying the valve body.

Installation and jointing

Pipeline connection is accomplished through threaded Lug ear holes drilled to match standard metric flange configurations. The contoured elastomer liner acts as an integral flange seal, eliminating the need for additional flat gaskets between connecting pipeline flanges.

Threaded lugs permit bolt tensioning directly into the valve body from either side, facilitating maintenance and the complete removal of downstream pipework while the upstream system remains pressurised at full PN16 rating. When aligning the valve between mating counter-flanges, the disc must remain partially opened to prevent distortion or pinching of the elastomer liner during initial bolt tightening. Fasteners should be torqued progressively in a diametrically opposed cross pattern to ensure uniform compression and long-term joint integrity.