Worm Gear Wafer Rubber Lined Butterfly Valve D373J Ductile Iron NBR Lined

Worm Gear Wafer Rubber Lined Butterfly Valve D373J Ductile Iron NBR Lined

D373J centerline wafer rubber lined butterfly valve with worm gear operator

Worm Gear Wafer Rubber Lined Butterfly Valve D373J Ductile Iron NBR Lined Specifications

The worm gear wafer rubber lined butterfly valve D373J is a quarter-turn isolation and throttling valve for water, wastewater, slurry, and mildly corrosive industrial fluids where the process wetted path must stay behind an elastomer lining. Trekre & Fouten Valve supplies this D373J gear-operated wafer butterfly valve with ductile iron or carbon steel wafer bodies, NBR, EPDM, or natural rubber linings on the body bore and disc faces, and a manual worm gear box for dependable field operation on DN200 and larger lines. The wafer body installs between two companion flanges; through bolts or studs clamp the valve so the pipeline carries end loads while the valve keeps a short face-to-face length in crowded plant rooms, vertical shafts, and packaged skids.

Body style: wafer rubber lined butterfly valve   Nominal size: DN50–DN1200   Pressure class: PN10 / PN16   Body material: ductile iron, WCB with NBR lining   Actuation: worm gear and handwheel

Centerline rubber lining and wafer layout

Centerline butterfly valves locate the stem on the disc center line so rotation stays balanced in the bore. On closing, the lined disc edge compresses the lined seat to form a peripheral seal; on opening, the disc leaves the seat quickly, which limits lining wear on clean water and air compared with some high-offset metal-seated designs. The D373J series uses soft sealing between a rubber-lined disc and a molded or vulcanized seat ring. Confirm the complete model code, lining compound, and seat construction on the approved drawing and purchase order before installation.

Wafer-style bodies fit between pipeline flanges without integral end flanges on the valve. Locating lugs or through holes align with the bolt circle per GB/T 12238, HG/T 20592, ANSI B16.5, or the project flange standard. Integrators must verify gasket type, bolt length, stud versus through-bolt arrangement, and that flange faces are parallel so the wafer body is not twisted during tightening. Face-to-face dimensions stay shorter than double-flanged butterfly valves, which helps spool-piece retrofits and skid assembly where axial space is limited.

Rubber lining isolates the metal body from the fluid. The lining covers the body bore, disc working surfaces, and seat sealing zone so acids, alkalis, slurries, and oily water contact elastomer rather than cast iron or steel. Lining thickness, adhesion, and curing process must match temperature, chemical concentration, and abrasion level. Trekre & Fouten Valve can propose NBR for general water and weakly corrosive duty, EPDM for higher temperature water and certain oxidizing environments, or other compounds when the datasheet confirms compatibility.

Worm gear operation and stroke control

A worm gear box converts slow handwheel rotation into a 90-degree disc stroke from fully open to fully closed. The reduction ratio lowers input torque on DN200 and larger sizes where a bare lever would be impractical. Self-locking worm gearing helps hold position after the operator releases the handwheel, which is useful on vertical or inclined pipe runs where gravity might otherwise drift an unbalanced disc. Open and closed stops are typically set at the factory; field adjustment should follow the actuator nameplate and the project I&M manual.

Manual worm gear operation suits lines with moderate cycle frequency and local operator access. Compared with electric or pneumatic actuators, the gear box adds fewer auxiliary systems—no motor starters, no compressed air headers—so capital and maintenance costs stay lower on remote water and utility networks. When future automation is required, verify stem dimensions, keyways, and mounting interfaces against ISO 5211 patterns before ordering an actuator retrofit package.

Materials, sealing, and corrosion resistance

Common body materials include ductile iron QT450-10, gray iron HT250, and WCB carbon steel. Internal surfaces receive NBR, EPDM, butyl, or neoprene lining by molding, vulcanizing, or bonding depending on size and design. The disc skeleton may be ductile iron, cast steel, or stainless steel with a continuous rubber cover on wetted faces. Seat rings may be fully bonded, replaceable cartridge, or insert type to simplify maintenance after abrasive slurry service.

Stem materials are typically 2Cr13, 304, or 316 stainless steel with rubber bushings, O-rings, or combined packing to limit external leakage along the stem. The stuffing box may use V-ring elastomer packing, graphite combinations, or O-ring stacks to balance corrosion resistance and operating torque. Wafer bolt quantity and diameter follow nominal size and pressure class; installers must match gaskets and fasteners to the companion flange standard and torque pattern so the lined body is not crushed or pulled out of alignment.

For slurry, ash, or pulp applications, confirm lining abrasion resistance and whether the flow path needs swept transitions or thicker linings at high-velocity zones. Oil-contaminated wastewater and intermittent chemical batches require explicit confirmation of NBR oil resistance or a switch to a more suitable elastomer. Never weld a rubber-lined wafer valve into the line; welding heat damages lining adhesion and creates field defects that are costly to repair.

Product parameters

Applications and industry use

Trekre & Fouten Valve D373J worm gear wafer rubber lined butterfly valves serve municipal wastewater treatment, industrial cooling water, mining tailings and concentrate lines, paper mill white water systems, power plant ash slurry headers, and general chemical batching manifolds where metal wetted paths would corrode or scale quickly. The compact wafer footprint fits gallery piping, valve pits, and equipment skids where flange-type lined valves would extend the spool length.

Compared with fully lined flange butterfly valves, the wafer form reduces weight and flange hardware on large diameters while keeping the same lined flow path philosophy. Compared with fluoropolymer-lined valves, rubber lining often delivers better elasticity and economy on abrasive slurries and neutral pH water, provided temperature and chemistry stay within the selected compound envelope. Compared with automated valves on infrequently operated branches, manual worm gear drives avoid standby power and instrument air dependencies.

Bidirectional sealing is commonly available; confirm flow direction markings if the project mandates single-direction duty with upstream pressure assist. Provide media composition, solids content, design temperature, design pressure, flange standard, and installation envelope when requesting a quotation so engineers can match body metal, lining type, bore size, and gear ratio to the actual line.

Installation, commissioning, and maintenance

Before installation, verify wafer bolt circle dimensions, stud length, and gasket type against the companion flanges. Align the valve bore with the pipeline centerline and tighten bolts in a cross pattern so the wafer body does not bind or distort the lining. Support heavy piping independently so the valve does not carry sustained pipe weight that could shear lining bonds.

Commission by cycling the handwheel slowly from open to closed and back, checking for smooth torque, full stroke stops, and zero visible leakage at the seat and stem seal at test pressure defined by the project. After long shutdowns, inspect gear box lubricant and stem seals before returning to service. Routine maintenance includes visual lining checks for blistering, cracking, delamination, or abrasion at the disc edge; replace damaged seat inserts or discs per manufacturer guidance rather than attempting temporary patches that hide underlying bond failure.

Store spare lined discs or seat cartridges for critical lines where downtime must stay minimal. Keep installation records of lining material, torque values, and test results so future maintenance teams do not mix incompatible elastomers during repair. Trekre & Fouten Valve technical support can review application data and recommend lining upgrades when process conditions change after initial commissioning.

Selection reference (typical options)

The tables list typical combinations, not a single fixed catalog row. Confirm bore, pressure class, body metal, lining compound, flange standard, and actuator details on the purchase order or technical agreement before manufacturing release.

This product belongs to the butterfly valve family. For bore, pressure, material, and actuation checks, refer to Trekre valve technical resources and project specifications.