Absperrklappe

A Absperrklappe is a quarter-turn rotational valve used to regulate, isolate, or shut off fluid flow in modern piping networks. Characterized by a compact, lightweight body and a central disc structure, butterfly valves are widely integrated into HVAC systems, municipal water distribution, Industriekühlung, and steam processing lines. Key structural components include the valve body, stem, Rabatt (butterfly plate), and resilient or metal seating ring.

Main Types of Butterfly Valves: Lug vs. Wafer

Industrial butterfly valves primarily fall into two mounting configurations: Lug-style Und Wafer-style. While functionally similar in flow regulation, each features distinct mechanical mounting designs suited for specific installation and inline maintenance needs.

Wafer Style vs. Lug Style Butterfly Valves

Choosing between wafer and lug configurations depends on your system’s pressure requirements, flange connectivity, and dead-end service needs:

• Lug-Type Butterfly Valves: Designed with threaded metal inserts (lugs) around the valve casing, matching international flange bolt patterns. Lug valves allow down-stream piping to be disconnected while keeping the upstream system under pressure (dead-end service).
• Wafer-Type Butterfly Valves: Engineered to fit snugly between two pipe flanges using through-bolts. Wafer valves are exceptionally lightweight, space-saving, and cost-effective for general liquid and gas isolation.

Classification by Body, Seat, and Disc Materials

Material selection depends directly on the system’s operating temperature, media corrosive properties, and pressure ratings:

• Körpermaterialien: Manufactured from high-grade cast iron, Sphäroguss (such as EN-GJS-500-7 / GGG50), or stainless steel. TWT GGG50 ductile iron butterfly valves are extensively exported to high-demand infrastructure projects across Europe, the Middle East, and Southeast Asia.
• Seat Materials: Features resilient elastomer seats (EPDM, NBR) or fluoropolymer linings (fully lined PTFE butterfly valves) to ensure zero-leakage sealing in aggressive chemical or high-purity applications.
• Disc Materials: Precision-machined from stainless steel (SS304/SS316), ductile iron with nylon coating, or nickel-plated coatings to handle demanding pressure spikes and abrasive fluids.

Advanced Structural & Offset Designs

To meet specialized high-pressure and high-temperature requirements, TWT provides a comprehensive suite of offset configurations and seating options:

TWT Butterfly Valve Dimensions & Size Availability

TWT manufactures a broad size spectrum to accommodate everything from compact commercial pipelines to large-diameter industrial mains:

Key Functions & Flow Control Capabilities

• On/Off Isolation & Shutoff: Delivers tight bi-directional bubble-tight sealing to prevent backflow and allow quick maintenance isolation.
• Precise Throttling & Flow Regulation: Gradual disc rotation enables linear or equal-percentage flow throttling and pressure management in fluid handling systems.

Leading Valve Manufacturer & OEM Solutions – TWT Brand

As an ISO, CE, and WRAS-certified industrial valve manufacturer, TWT produces a complete portfolio of high-reliability butterfly valves designed to comply with ANSI, AUS, BS, and JIS international standards.

Featured Valve Models for International Sourcing:

• PN16 Flanged & Wafer Butterfly Valves: Standard PN10/PN16 pressure rating for European and Middle-Eastern municipal networks.
• U-Type Flanged Butterfly Valves: Ideal for large-diameter pipelines requiring robust double-flanged stability.
• Lug-Style High Performance Valves: Engineered for severe service, dead-end isolation, and corrosive chemical lines.

Looking for technical dielines, CAD models, or direct factory pricing on TWT butterfly valves? Request a wholesale quote or contact our technical sales engineers today.