Gear Operated Butterfly Valve Supplier India — Krishna Industries, Ahmedabad
B2B supplier of Gear Operated Butterfly Valves — CI (IS 210) / DI (ASTM A536) / WCB / SS304 / SS316 body — SS304 / SS316 / CI disc — EPDM / NBR / PTFE seat — wafer and lug type — DN50 (2″) to DN600 (24″) — PN10 / PN16 — API 598 tested — standard for large bore isolation in water treatment, HVAC, ETP/STP, cooling towers, and industrial pipelines.
GST Invoice · API 598 Test Certificate · MOQ 10 Nos · 50–500 Nos per PO · Pan India Dispatch from Ahmedabad
A Gear Operated Butterfly Valve uses a worm gear mechanism — a handwheel turning a worm shaft that drives a worm wheel on the valve disc shaft — to open and close the disc. The gear reduction (typically 1:40 to 1:120 depending on valve size) multiplies the operator’s handwheel torque so that large bore valves — DN150 to DN600 — can be operated by one person with comfortable manual effort. Furthermore, the worm gear is self-locking — the disc stays precisely in whatever position the handwheel is left in because the worm cannot be back-driven by pipeline pressure. This makes gear operated butterfly valves superior to lever operated for throttling and partial-open flow regulation at larger bore.
Krishna Industries (KELOR), based in Ahmedabad, Gujarat, supplies Gear Operated Butterfly Valves — CI / DI / WCB / SS304 / SS316 body — SS304 / SS316 disc — EPDM / NBR / PTFE seat — wafer and lug — DN50 to DN600 — PN10 / PN16 — API 598 tested — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad. Sourced from Pneutork and AIRA Euro, GIDC Vatva / Naroda, Ahmedabad.
When to Specify Lever vs Gear — The Size and Torque Decision
The most common specification question on Indian butterfly valve projects. Use this table to decide correctly before ordering.
| Size Range | Typical Operating Torque (EPDM Seat) | Standard Operator | Reason |
|---|---|---|---|
| DN50 – DN80 (2″–3″) | 5 – 15 Nm | ✅ Lever operated | Low torque — comfortable single-hand lever operation — gear adds unnecessary cost and bulk for small bore |
| DN100 – DN150 (4″–6″) | 15 – 35 Nm | ✅ Lever (DN100–DN125) / Gear optional (DN150) | DN100–DN125 lever comfortable. DN150 lever becomes heavy for frequent operation — specify gear for DN150 where frequent operation is expected |
| DN200 (8″) | 35 – 60 Nm | ✅ Gear operated — standard | DN200 lever torque exceeds comfortable single-person operation for EPDM seat — gear reduces to comfortable handwheel effort |
| DN250 – DN300 (10″–12″) | 60 – 120 Nm | ✅ Gear operated — mandatory | Lever not practical — gear handwheel standard — position indicator standard for confirming open/closed status |
| DN400 – DN600 (16″–24″) | 120 – 300 Nm | ✅ Heavy duty gear — high torque worm gear | High torque worm gear with larger gear ratio — more handwheel turns to open/close but comfortable effort per turn — position indicator essential |
💡 PTFE seat valves have higher operating torque than EPDM — approximately 20–40% more torque for the same size and pressure. If your specification calls for PTFE seat, specify gear one size lower than the table above suggests (i.e., specify gear at DN150 even if EPDM at that size could be lever). Always confirm torque with the manufacturer before specifying lever for PTFE seat above DN100.
Body Material Selection — All Grades
| Body Material | ✅ Specify For | ❌ Not For |
|---|---|---|
| CI (IS 210 FG260) | ✅ Municipal water, HVAC, irrigation, ETP/STP, cooling tower, fire fighting — most economical — standard for Indian infrastructure and water treatment gear BFV BOM | Aggressive chemical, seawater, DM water contamination risk, corrosive outdoor coastal |
| DI (ASTM A536) | ✅ Large bore DN200+ where CI strength insufficient — buried pipeline, heavy-duty pump station — higher impact resistance — standard for large bore gear BFV on Indian municipal water projects | Aggressive chemical — specify SS for corrosive media |
| WCB | High pressure Class 150/300 industrial process — steam, oil, gas — where PN16 CI is insufficient | Corrosive chemical, potable water where iron contamination is a concern |
| SS304 (CF8) | ✅ HVAC chilled/hot water, DM water, pharma non-GMP, food non-chloride — corrosion resistant — no iron contamination | High chloride, seawater, aggressive chemical — specify SS316 |
| SS316 (CF8M) | ✅ Chemical plant corrosive media, chloride service, coastal, offshore, pharma GMP — Mo addition provides chloride pitting resistance SS304 lacks | Very high temperature above 425°C |
Available Configurations — Select Your Gear Operated BFV
CI Body — EPDM Seat SS304 Disc · Wafer/Lug · DN150–DN600 · Most popular
CI Body — NBR Seat SS304 Disc · Raw water sewage irrigation
CI Body — PTFE Seat SS316 Disc · Chemical service
DI Body — EPDM Seat SS304 Disc · Large bore DN200–DN600
SS304 / SS316 Body Gear operated · HVAC pharma chemical
Electric Actuated BFV 220V AC · BMS/DCS · From gear operated base
Why Worm Gear Self-Locking Matters — Safety and Flow Control
The worm gear mechanism used in gear operated butterfly valves is inherently self-locking. This means the disc stays exactly in its current position — fully open, partially open, or fully closed — without any brake, lock pin, or locking device. Pipeline pressure acting on the disc cannot back-drive the worm gear. Furthermore, this self-locking property makes gear operated butterfly valves the correct specification for throttling and flow regulation at large bore — a lever operated butterfly valve relies on a notched locking plate that can slip under high pipeline pressure and vibration, allowing the disc to shift from its set position.
Technical Specifications — Gear Operated Butterfly Valve
| Parameter | Specification |
|---|---|
| Valve Type | Wafer butterfly valve / Lug butterfly valve — with worm gear handwheel operator |
| Body Material | CI IS 210 / DI ASTM A536 / WCB ASTM A216 / CF8 SS304 / CF8M SS316 |
| Disc Material | SS304 (CF8 — standard) / SS316 (CF8M — corrosive) / CI (most economical — raw water/sewage) |
| Seat Material | EPDM (HVAC treated water — standard) / NBR (raw water, sewage) / PTFE (chemical service, high temp) |
| Shaft Material | SS304 (standard) / SS316 (corrosive service) |
| Gear Operator | Worm gear reduction unit — powder coated mild steel body — stainless steel internals on request — self-locking — position indicator — ISO 5211 top flange for actuator mounting |
| End Connection | Wafer (standard — between ANSI/DIN/IS flanges) / Lug (dead-end and terminal service) |
| Size Range | DN50 (2″) to DN600 (24″) — gear standard from DN150 — can be supplied from DN50 on request |
| Pressure Rating | PN10 / PN16 |
| Temperature Range | -40°C to +120°C (EPDM) / -20°C to +80°C (NBR) / -10°C to +180°C (PTFE) |
| Face to Face | ISO 5752 Series 20 |
| Flange Compatibility | ANSI B16.5 Class 150 / DIN PN10 / DIN PN16 / IS 1538 — universal wafer body fits all three without modification |
| Design Standard | API 609 / BS EN 593 / IS 13095 |
| Testing Standard | API 598 — hydrostatic shell test + Class VI seat leakage test |
| Position Indicator | Standard on all gear operated valves — shows disc position (0°–90°) from handwheel end |
| ISO 5211 Top Flange | Standard — allows future upgrade to electric or pneumatic actuator without valve removal |
| MOQ | 10 Nos per size per configuration |
| HSN Code | 84818090 |
Standard Dimensions — Gear Operated Butterfly Valve (ISO 5752)
| Size | DN | Face to Face (mm) | Flange OD (mm) | Typical Gear + Handwheel Height (mm) | Approx. Handwheel Turns Open→Close |
|---|---|---|---|---|---|
| 2″ | DN50 | 43 | 125 | ~280 | 8–12 turns |
| 4″ | DN100 | 46 | 180 | ~320 | 10–15 turns |
| 6″ | DN150 | 52 | 220 | ~380 | 12–18 turns |
| 8″ | DN200 | 56 | 285 | ~440 | 15–20 turns |
| 10″ | DN250 | 56 | 345 | ~500 | 18–24 turns |
| 12″ | DN300 | 56 | 410 | ~560 | 20–28 turns |
| 16″ | DN400 | 60 | 515 | ~640 | 24–32 turns |
| 20″ | DN500 | 68 | 620 | ~720 | 28–36 turns |
| 24″ | DN600 | 78 | 725 | ~820 | 32–40 turns |
Industries & Applications — Gear Operated Butterfly Valve
💧 Municipal Water Supply
Large bore DN200–DN600 transmission main zone isolation, pump station headers, elevated water reservoir inlet/outlet — CI body EPDM 50–500 Nos per EPC project BOM.
🏭 ETP / STP Plants
Inlet, outlet, sludge recirculation, aeration basin isolation — DN200–DN600 gear operated standard for treatment plant large bore valves.
❄️ HVAC — Large Bore
Chiller header, cooling tower supply/return, condenser water main isolation — DN150–DN300 CI body EPDM — BMS-ready with ISO 5211 actuator pad.
⚡ Power Plant Cooling
Cooling water distribution headers, condenser inlet/outlet, ash slurry systems — DI body large bore DN300–DN600 gear operated.
🌾 Irrigation Mains
PMKSY and state irrigation project main distribution headers — DN200–DN600 CI body NBR or EPDM — high volume per project BOM.
⚗️ Chemical Plants
Process chemical main headers — SS316 CF8M body PTFE seat — gear operated for larger DN150–DN300 chemical distribution lines at Ankleshwar, Vapi, Dahej.
🔥 Fire Fighting Mains
Fire hydrant ring main isolation — sprinkler system zone valves DN150+ — CI body EPDM PN16 — gear operated for large bore fire main zone isolation.
🏗️ EPC Projects
Bulk BOM supply — 50–500 Nos per project across sizes — municipal water, irrigation, industrial township — single GST invoice and API 598 certificate package.
Gear Operated vs Lever Operated — Quick Reference
| Feature | Gear Operated BFV | Lever Operated BFV |
|---|---|---|
| Operation | Handwheel + worm gear — multiple turns | Quarter-turn lever — fast single action |
| Size range | ✅ DN150 to DN600 — all sizes where lever torque too high | DN50 to DN150 standard — lever torque comfortable |
| Operating speed | Slower — multiple handwheel turns required | ✅ Fast — one quarter-turn lever action |
| Self-locking | ✅ Worm gear is inherently self-locking — disc holds position without separate lock | Notched locking plate — can slip under high pressure/vibration |
| Throttling | ✅ Better for throttling — self-locking holds partial-open position precisely | Less reliable for throttling — locking plate less precise |
| Actuator upgrade | ✅ ISO 5211 top flange — easy retrofit to electric or pneumatic actuator | Requires operator replacement for actuator upgrade |
| Cost | Higher — gear unit adds cost over lever | ✅ Lower — lever is lowest-cost operator |
Why EPC Contractors and Plant Buyers Choose Krishna Industries
🏭
Sourced from GIDC Vatva / Naroda
Pneutork and AIRA Euro — both Ahmedabad manufacturers — shortest supply chain, competitive Gujarat factory pricing for all Indian buyers.
📦
50–500 Nos per PO
EPC project volumes — mixed sizes in one PO — single GST invoice — complete documentation package with one dispatch.
📄
GST Invoice & API 598
100% GST compliant (GSTIN: 24AKLPP6499B1ZT). API 598 hydrostatic and seat leakage test certificate with every order.
🔧
ISO 5211 Actuator Ready
Every gear operated BFV supplied with ISO 5211 top flange — compatible with electric and pneumatic actuators for future automation upgrade.
🚚
Pan India Dispatch
Maharashtra, Tamil Nadu, Rajasthan, Karnataka, and all states via VRL / Professional Courier — 2–7 days transit from Ahmedabad.
⏱️
2-Hour Quote
WhatsApp size list, body material, disc, seat, and quantity. Consolidated BOM pricing within 2 hours. Mon–Sat 9 AM–7 PM IST.
Need Bulk Pricing for Gear Operated Butterfly Valve?
Share size list (DN), body (CI / DI / SS304 / SS316), disc (SS304 / SS316 / CI), seat (EPDM / NBR / PTFE), wafer or lug, and quantity. BOM pricing within 2 hours.
Supply Coverage — PAN India from Ahmedabad
Krishna Industries dispatches Gear Operated Butterfly Valves from Ahmedabad to: Mumbai, Pune, Nashik, Nagpur (Maharashtra) · Chennai, Coimbatore, Bengaluru, Hyderabad, Vizag (South India) · Delhi, Noida, Gurugram, Jaipur (North India) · Surat, Vadodara, Rajkot, Anand, Bhavnagar (Gujarat) and all other states via VRL / Professional Courier. Supplier India — Krishna Industries, Ahmedabad Butterfly Valve Supplier India — Krishna Butterfly Valve Supplier India — Krishna
Related Products — Krishna Industries (KELOR)
- Gear Operated Butterfly Valve — Product Page — full technical specifications, disc and seat selection guide, and BOM ordering
- Lever Operated Butterfly Valve — for DN50–DN150 where lever torque is comfortable and fast operation is priority
- Electric Actuated Butterfly Valve — upgrade from gear operated — BMS/DCS automation — same valve body with electric actuator on ISO 5211 pad
- CI Butterfly Valve Hub — all CI butterfly valve types and operators
- Butterfly Valve Hub — Complete Range — all BFV types, materials, and operators in one selection guide
Frequently Asked Questions
From what size should I specify gear operated instead of lever for a butterfly valve?
The standard Indian project specification threshold is DN150 (6″) and above for gear operated. At DN150 with EPDM seat and PN16 pressure, the operating torque is approximately 30–40 Nm — still manageable with a lever but becoming heavy for frequent operation. From DN200 (8″) and above, gear operated is mandatory — lever torque at DN200 and above exceeds comfortable single-person operation. Furthermore, if your specification calls for PTFE seat instead of EPDM, the torque is approximately 20–40% higher for the same size — specify gear one size earlier (i.e., from DN125 or DN150 instead of DN200). For final specification, confirm the actual operating torque from the manufacturer based on your specific seat material, disc material, and pressure class.
What does self-locking mean in a gear operated butterfly valve?
The worm gear mechanism used in gear operated butterfly valves is inherently self-locking because the worm geometry prevents back-driving — pipeline pressure acting on the disc cannot rotate the worm shaft and turn the handwheel. The disc remains exactly where the handwheel leaves it without any separate locking device. This is different from a lever operated butterfly valve, which uses a notched locking plate that must be manually engaged and can disengage under vibration or pipeline pressure surges. Self-locking is particularly important for throttling service — a gear operated butterfly valve can be set to a precise intermediate position for flow regulation, and it will hold that position indefinitely without drift. A lever operated valve in partial-open throttling position can shift due to flow-induced vibration.
What is an ISO 5211 top flange and why does it matter?
ISO 5211 is the international standard for mounting flange dimensions on quarter-turn valve operators — it defines the bolt hole pattern and shaft dimension at the top of the gear operator. When a gear operated butterfly valve is supplied with an ISO 5211 compliant top flange, an electric or pneumatic actuator can be mounted directly on the same valve body in the future without replacing the valve. This is the standard for Indian projects where the initial specification is manual gear operation but the client may want to automate later — a gear operated BFV with ISO 5211 pad can be upgraded to electric or pneumatic operation at any time by simply removing the gear unit and bolting on an actuator. Always specify ISO 5211 top flange — it is standard on all KELOR gear operated butterfly valves supplied from Pneutork and AIRA Euro.
What is the difference between CI disc and SS304 disc for a gear operated butterfly valve?
The disc material selection applies regardless of whether the valve is lever or gear operated. A CI disc corrodes in treated HVAC water and potable water, leaving rust particles that contaminate the water and eventually cause the disc to fail structurally within 3–5 years. An SS304 disc is corrosion resistant — no contamination risk — and provides 15–20+ year disc life in treated water service. For Indian HVAC and water treatment gear operated butterfly valve specifications, SS304 disc is the standard. CI disc is acceptable only for raw water, sewage, and irrigation where water quality is low and contamination is not a concern. SS316 disc is specified for coastal, seawater, chloride-rich, and chemical service where SS304 pits.
What is the MOQ and documentation provided for EPC project orders?
MOQ is 10 Nos per size per configuration. EPC project BOM orders — 50 to 500+ Nos across multiple sizes, body materials, disc types, and seat types — are supplied in a single consolidated order with one GST invoice (GSTIN: 24AKLPP6499B1ZT), API 598 hydrostatic test certificate, seat leakage certificate, and MTC for disc grades (SS304/SS316) on request. WhatsApp your complete BOM listing size, body, disc, seat, wafer or lug, and quantity per line for pricing within 2 hours and formal quotation within 4 hours.