REW Signature Product · BFV Series
Butterfly Valves
Lever · Gear · Motorized · Wafer · Lug · Flange · 50mm – 2500mm
Quarter-turn valves engineered for reliable on/off and throttling service in water, oil, gas and chemical pipelines. Manufactured to BSS 5155, API 609 and EN 593 standards — available in lever, gear, motorized, wafer, lug and flanged configurations up to 2500mm diameter.
Size Range
50mm to 2500mm
Pressure Class
PN10 – PN40
Standards
BSS 5155 · API 609
Body Material
CI · DI · CS · SS
ISO 9001:2015 Certified
BSS 5155 · API 609 · EN 593
100% Hydrostatically Tested
Since 1948 · Lahore, Pakistan
79+ Years of Valve Engineering
ISO 9001:2015 Certified
BSS 5155 · API 609 · EN 593
100% Hydrostatically Tested
Since 1948 · Lahore, Pakistan
79+ Years of Valve Engineering
CROSS-SECTION · 01
Product Overview
The Compact Power of Quarter-Turn
A butterfly valve is a quarter-turn rotary motion valve used to start, regulate and stop flow. The disc rotates 90° on a central shaft — fully open in one quarter turn, fully closed in another. REW manufactures butterfly valves from DN50 to DN2500, serving Pakistan's largest utilities, power plants and industrial facilities since 1948.
Six core configurations — Lever, Gear, Motorized, Wafer, Lug and Flanged — per BSS 5155, API 609 and EN 593 standards. Up to 60% lighter and more compact than equivalent gate valves, with bi-directional flow capability and bubble-tight sealing.
Quarter-Turn Operation
90° rotation from fully open to fully closed — rapid flow control with minimal effort
Bubble-Tight Seal
Precision-machined disc with elastomer seat — zero-leakage shutoff per API 598
Compact & Lightweight
Up to 60% lighter than gate valves — reduces support costs and space requirements
Bi-Directional Flow
Symmetrical disc design allows installation in either flow direction
Product Variants
Six Core Configurations
Each engineered for specific actuation and installation requirements — from manual lever operation to fully automated motorized control.
BFV-L
Type 01
Lever Operated
Manual lever handle for quick quarter-turn operation on smaller diameter valves.
Ideal for frequent manual operation where accessibility is good. 10-position latch plate
locks the valve in any position from fully open to fully closed.
Quick 90° quarter-turn operation
10-position latch plate for throttling
Lockable handle position for safety
Cast iron / ductile iron body
Size: 50mm – 300mm (2" – 12")
Pressure: PN10 – PN16 / Class 125 – 150
Material: CI, DI, CS, SS
Standard: BSS 5155, API 609
Primary Applications
Water Supply
HVAC
Irrigation
Fire Protection
BFV-G
Type 02
Gear Operated
Worm gear operator for high-torque applications on larger valves. Provides mechanical
advantage for smooth, controlled operation under pressure. Self-locking worm gear prevents
back-drive and maintains position without continuous force.
Self-locking worm gear mechanism
Handwheel with position indicator
Extension stem available for buried service
ISO 5211 mounting pad for actuator
Size: 150mm – 1200mm (6" – 48")
Pressure: PN10 – PN25 / Class 125 – 150
Material: CI, DI, CS, SS
Standard: BSS 5155, API 609
Primary Applications
Large Diameter
High Torque
Industrial
Water Mains
BFV-M
Type 03
Motorized / Actuated
Electric, pneumatic or hydraulic actuators for remote and automated control. Integrates
with SCADA, DCS and PLC systems for process automation. Fail-safe options available for
critical safety applications.
Electric / pneumatic / hydraulic options
4-20mA / Modbus / Profibus communication
Fail-safe spring return available
Local/remote/manual override
Size: 50mm – 2500mm (2" – 100")
Pressure: PN10 – PN40 / Class 125 – 300
Material: CI, DI, CS, SS
Standard: BSS 5155, API 609, ISO 5211
Primary Applications
SCADA Systems
Process Control
Remote Operation
Critical Service
BFV-W
Type 04
Wafer Type
Compact wafer body design fits between pipe flanges without bolt holes through the valve body.
Lightweight construction with full perimeter seat for bi-directional sealing. Lug pattern
available for dead-end service.
Fits between pipe flanges — no bolt holes
Up to 60% lighter than flanged type
EPDM / NBR / Viton seat options
Lug pattern for dead-end service
Size: 50mm – 600mm (2" – 24")
Pressure: PN10 – PN16 / Class 125 – 150
Material: CI, DI, CS, SS
Standard: BSS 5155, API 609, EN 593
Primary Applications
Compact Layouts
HVAC
Water Treatment
Fire Protection
BFV-LG
Type 05
Lug Type
Threaded lug holes on both sides allow the valve to be bolted independently to each flange.
Enables dead-end service where one side of the pipeline can be removed for maintenance
without disturbing the other side.
Threaded lug holes for independent bolting
Dead-end service capability
Easy maintenance access
Full perimeter seat sealing
Size: 50mm – 600mm (2" – 24")
Pressure: PN10 – PN16 / Class 125 – 150
Material: CI, DI, CS, SS
Standard: BSS 5155, API 609
Primary Applications
Dead-End Service
Maintenance Access
Water Systems
Chemical
BFV-F
Type 06
Flanged Type
Full flanged body with drilled flanges matching pipe flanges. Superior strength for
high-pressure and large-diameter applications. Heavy-duty cast body with double-flange
construction for maximum reliability.
Full flanged body with drilled flanges
PN10 / PN16 / PN25 / PN40 ratings
Double-flange heavy-duty construction
Up to DN2500 (100") diameter
Size: 100mm – 2500mm (4" – 100")
Pressure: PN10 – PN40 / Class 125 – 300
Material: CI, DI, CS, SS
Standard: BSS 5155, API 609, EN 593
Primary Applications
High-Pressure
Large Diameter
Water Mains
Critical Service
Manufacturing Process
Watch Our Production Line
From raw casting to final hydrostatic test — witness seven decades of valve engineering mastery in motion.
REW Butterfly Valve Manufacturing
From casting to final testing — complete production process
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Applications
Serving 40+ Industries
REW butterfly valves protect Pakistan's most critical pipeline infrastructure — from water utilities to oil refineries.
01
Water Supply
WASA, KWSB, municipal distribution, treatment plants
02
Wastewater
Sewage treatment, effluent handling, sludge lines
03
Hydropower
WAPDA projects, penstocks, turbine protection
04
HVAC
Chilled water, heating circuits, cooling towers
05
Fire Protection
Hydrant systems, sprinkler mains, fire water storage
06
Chemical
SS valves for corrosive media, acid, alkali service
07
Sugar Mills
Juice heaters, process lines, condensate return
08
Oil & Gas
Refineries, pipelines, OGDCL, PPL, PARCO terminals
09
Power Generation
Hydro, thermal — WAPDA, K-Electric, NEPRA
10
Mining
Slurry lines, dewatering, mineral processing
11
Food Processing
Sanitary lines, CIP systems, steam sterilization
12
Textile
Dyeing, steam distribution, process water
Working Principle
Quarter-Turn Flow Control
Step-by-step operation sequence of a REW butterfly valve — from fully closed to fully open in just 90° of rotation.
01
Fully Closed Position
Disc is perpendicular to flow, sealing against the elastomer seat. Zero flow passes through. The shaft is at 0° position with handle/actuator in closed position.
02
Opening Sequence
Quarter-turn rotation (90°) begins. Disc rotates on central shaft, gradually opening the flow path. Flow rate increases proportionally with disc angle.
03
Throttling Position
At 45° (half-open), flow is approximately 50% of maximum. Butterfly valves excel at throttling service with predictable flow characteristics.
04
Fully Open Position
Disc is parallel to flow at 90°. Minimal pressure drop — disc presents thin profile to flow. Full bore flow achieved with near-zero resistance.
05
Flow Characteristics
Approximately equal-percentage flow characteristic. Flow rate increases exponentially with disc angle — ideal for precise throttling control.
06
Bi-Directional Capability
Symmetrical disc design allows installation in either flow direction. Same sealing performance regardless of flow direction — simplifies inventory and installation.
CROSS-SECTION VIEW
Construction Details
Every Component Engineered
Detailed breakdown of each major component — function, material, and engineering importance.
Body
Primary pressure-containing component. Cast in CI, DI, CS or SS. Houses the seat ring and supports the shaft. Wafer, lug or flanged design.
Disc
The closure element that rotates 90° to control flow. CI, DI, CS, SS or Alloy 20. Precision-machined for bubble-tight sealing against the seat.
Shaft / Stem
One-piece blow-out proof shaft transmitting torque from actuator to disc. SS410, SS304 or SS316. Double D or splined connection to disc.
Seat Ring
Precision-machined elastomer or metal seat. EPDM, NBR, Viton, PTFE or SS316 overlay. Renewable design allows field replacement.
Shaft Bearings
Self-lubricating PTFE or bronze bushings support the shaft. Reduce friction and ensure smooth, low-torque operation over millions of cycles.
Actuator Mounting
ISO 5211 standardized mounting pad for direct coupling of electric, pneumatic or hydraulic actuators. No bracket adapters required.
Position Indicator
Visual position indicator on top of shaft shows open/closed/throttled position. Essential for manual operation and remote monitoring.
Gasket / O-Ring
Shaft seals prevent leakage along the shaft. PTFE or elastomer O-rings ensure pressure integrity at the shaft-body interface.
Technical Specifications
The Engineering Ledger
Complete specification sheet for REW Butterfly Valves — every dimension, material, and standard documented for your engineering team.
Butterfly Valve · Full Specification
DOC · BFV-SPEC-2026
| Product Name | Butterfly Valve — Lever, Gear, Motorized, Wafer, Lug, Flanged Types |
|---|---|
| Size Range | 50 mm (2") to 2500 mm (100") |
| Pressure Rating | PN10, PN16, PN25, PN40 · Class 125, 150, 300 |
| Body Material | Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB/WCC), Stainless Steel (CF8/CF8M) |
| Disc Material | Cast Iron, Ductile Iron, SS304, SS316, SS316L, Alloy 20, Duplex |
| Shaft Material | SS410, SS304, SS316 (one-piece, blow-out proof design) |
| Seat Material | EPDM, NBR, Viton (FKM), PTFE, Metal (SS316 overlay) |
| Face-to-Face | EN 558-1 Series 14 / API 609 Category A & B |
| Flange Standard | BS 4504, EN 1092-2, ANSI B16.5, DIN 2501 |
| Design Standard | BSS 5155, API 609, EN 593, AWWA C504 |
| Testing Standard | API 598, EN 12266-1, BS 6755 |
| Leakage Class | Class VI (soft seat) / Class IV (metal seat) per ANSI/FCI 70-2 |
| Actuation | Lever, Gearbox, Electric, Pneumatic, Hydraulic |
| Coating | Epoxy coated (250 microns DFT), Fusion bonded epoxy, Hot-dip galvanized |
| Applications | Water, Oil, Gas, Steam, Chemicals, Sewage, Irrigation, Fire Protection |
| Certification | ISO 9001:2015 · ISO 14001:2015 · ISO 45001:2018 · PSQCA |
| Origin | Manufactured in Lahore, Pakistan — Since 1948 |
Engineering Standards
Compliance & Certifications
Every REW butterfly valve is manufactured and tested to internationally recognized standards.
BSS 5155
British Standard
Butterfly valves for general purposes. Primary design standard for REW butterfly valves in municipal and industrial service.
API 609
American Petroleum Institute
Butterfly valves: Double flanged, lug- and wafer-type. Covers design, manufacture, testing for petroleum industry service.
EN 593
European Standard
Industrial valves — Metallic butterfly valves. European market compliance for design, testing and documentation.
EN 558-1
Face-to-Face Dimensions
Basic dimensions for face-to-face and center-to-face of industrial valves. Ensures dimensional interchangeability.
API 598
Valve Testing
Standard testing procedures for all valve types. Shell test at 1.5×, seat test at 1.1× working pressure.
BS 4504
Flange Standard
Circular flanges for pipes, valves and fittings. PN designated. Covers bolt patterns and dimensions.
ANSI B16.5
American Flange Standard
Pipe flanges and flanged fittings. Class 125, 150, 300 ratings for American market compliance.
ISO 5211
Actuator Mounting
Industrial valves — Part-turn actuator attachments. Standardized mounting for electric and pneumatic actuators.
ISO 9001:2015
Quality Management
Quality management system certified by TÜV Austria. Every valve traceable from raw material to final test.
Pressure Ratings
Working & Test Pressures
Pressure-temperature ratings for REW butterfly valves across all standard pressure classes.
| Pressure Class | Working Pressure (bar) | Shell Test (bar) | Seat Test (bar) | Temperature Limit |
|---|---|---|---|---|
| PN10 | 10 | 15 | 11 | -10°C to +80°C (EPDM) |
| PN16 | 16 | 24 | 17.6 | -10°C to +120°C (NBR) |
| PN25 | 25 | 37.5 | 27.5 | -20°C to +200°C (Viton) |
| PN40 | 40 | 60 | 44 | -20°C to +200°C (PTFE) |
| Class 125 | 14.5 | 21.8 | 16 | -20°C to +120°C |
| Class 150 | 19.6 | 29.4 | 21.6 | -29°C to +200°C |
| Class 300 | 50 | 75 | 55 | -29°C to +200°C |
Dimensional Information
Size & Weight Data
Select a size to view detailed dimensional data for wafer butterfly valves. All dimensions in millimeters.
DN50
DN100
DN150
DN200
DN300
DN400
DN600
Nominal Size (DN)50 mm
Face-to-Face (L)43 mm
Height (H)115 mm
Flange Diameter165 mm
Bolt Circle125 mm
No. of Bolts4
Bolt DiameterØ19 mm
Weight (approx.)3.5 kg
The Forge
Forged with 79 Years of Mastery
From raw casting to final hydrostatic test — every REW butterfly valve passes through a rigorous manufacturing process refined over seven decades at our Lahore facility.
01
Pattern & Casting
Precision wooden/metal patterns, green-sand and shell-mould casting in CI, DI, CS, SS
02
CNC Machining
CNC lathes and VMCs for seat bore, shaft holes, flange drilling to ±0.02mm tolerance
03
Disc & Shaft Assembly
Precision-machined disc fitted to blow-out proof shaft. Double D or splined connection for torque transmission
04
Seat Installation
Elastomer seat ring press-fit or bonded into body. Metal seats welded and machined to final dimensions
05
Hydrostatic Testing
Shell test at 1.5×, seat test at 1.1× working pressure — per API 598 / BSS 5155
06
Painting & Dispatch
Epoxy coating (250 microns DFT), marking, documentation pack with MTC and test certificate
FACILITY · LHR
CNC Machining · Lahore Plant
Quality Assurance
Zero-Defect Philosophy
Every valve undergoes rigorous inspection and testing before dispatch. Our quality system is certified to ISO 9001:2015 by TÜV Austria.
Incoming Inspection
Raw material verification — chemical composition and mechanical properties per EN 10204 3.1
Dimensional Inspection
CMM and precision instruments verify all critical dimensions against approved drawings
Hydrostatic Shell Test
1.5× working pressure held for specified duration. No visible leakage permitted
Seat Leakage Test
1.1× working pressure on seat. Zero visible leakage per API 598 / EN 12266
Torque Test
Opening/closing torque verified across full 90° rotation. Ensures smooth operation under pressure
Coating Inspection
DFT measurement, adhesion test, holiday detection for epoxy coatings
Identification Marking
Size, pressure class, material grade, heat number, manufacturer logo — permanently marked
Documentation
MTC, test certificates, dimensional reports, painting certificates — complete traceability
QA LAB · LHR
Technical Resources
Download Documentation
Complete technical documentation for engineering, procurement, and installation teams.
Technical Datasheet
Complete specifications, materials, dimensions, and performance data for all butterfly valve variants.
Download →
Product Catalogue
Full REW product range with technical data, applications, and ordering information.
Download →
Installation Manual
Step-by-step installation guide, orientation requirements, and commissioning procedures.
Download →
Maintenance Manual
Preventive maintenance schedules, seat replacement, actuator servicing, and overhaul procedures.
Download →
CAD Drawings
2D and 3D CAD files in DWG, STEP, and IGES formats for integration into your designs.
Download →
Certificates
ISO 9001, ISO 14001, ISO 45001, PSQCA, and type approval certificates.
Download →
Test Reports
Sample hydrostatic test reports, material test certificates, and inspection records.
Download →
Selection Guide
Technical guide for selecting the right butterfly valve type and size for your application.
Download →
Installed Projects
Trusted Across Pakistan
REW butterfly valves installed in critical infrastructure projects nationwide.
Water Supply
Lahore Water Treatment Plant
Lahore, Punjab
320+
Valves Installed
DN100-1200
Size Range
2024
Completion
Oil & Gas
PARCO Oil Terminal Expansion
Mahmood Kot, Punjab
180+
Valves Supplied
PN25
Pressure Class
2025
Phase 2
Power Generation
Muzaffargarh Power Station
Muzaffargarh, Punjab
160+
Butterfly Valves
PN16
Pressure Class
2025
Completed
Sugar Mills
Chashma Sugar Mill Expansion
Mianwali, Punjab
240+
Valves Installed
DN100-800
Size Range
2026
Ongoing
Technical FAQ
Engineering Questions
Answers to the most common technical questions about REW butterfly valves.
What is the difference between wafer, lug and flanged butterfly valves?+
Wafer type fits between pipe flanges without bolt holes through the valve — lightest and most compact. Lug type has threaded holes allowing independent bolting to each flange for dead-end service. Flanged type has full drilled flanges matching pipe flanges — heaviest duty for high-pressure and large diameter applications.
What are the six types of butterfly valves REW manufactures?+
REW manufactures six core configurations: (1) Lever Operated — manual handle for small valves, (2) Gear Operated — worm gear for high torque, (3) Motorized/Actuated — electric/pneumatic/hydraulic for automation, (4) Wafer Type — compact between-flange design, (5) Lug Type — threaded lug holes for dead-end service, (6) Flanged Type — full drilled flanges for high pressure.
What is the size range for REW butterfly valves?+
REW manufactures butterfly valves from DN50 to DN2500 (2" to 100"). Cast iron body butterfly valves are available from 50mm to 2500mm. Cast steel body butterfly valves (high pressure) from 50mm to 500mm. Stainless steel body butterfly valves from 50mm to 600mm.
What pressure ratings are available?+
REW butterfly valves are available in PN10, PN16, PN25, PN40 and Class 125, 150, 300. Shell test is performed at 1.5× working pressure and seat test at 1.1× working pressure per API 598 and BSS 5155 standards.
What standards do REW butterfly valves comply with?+
REW butterfly valves are manufactured to BSS 5155, API 609 and EN 593 standards. Face-to-face dimensions follow EN 558-1 Series 14 and API 609. Flanges conform to BS 4504, ANSI B16.5, DIN 2501 and EN 1092. Testing is per API 598 and EN 12266-1.
What body materials are available?+
Standard body materials include Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB/WCC), and Stainless Steel (CF8/CF8M). Shafts are always stainless steel (SS410, SS304 or SS316). Seat rings are available in EPDM, NBR, Viton, PTFE or metal (SS316 overlay).
Can butterfly valves be used for throttling?+
Yes. Butterfly valves excel at throttling service with approximately equal-percentage flow characteristic. Flow rate increases exponentially with disc angle — ideal for precise flow control. However, for very precise throttling at low flow rates, globe valves may be preferred.
What seat materials are available?+
REW offers EPDM seats for water service up to 80°C, NBR seats for oil service up to 120°C, Viton (FKM) seats for chemical service up to 200°C, PTFE seats for aggressive media up to 200°C, and metal (SS316 overlay) seats for high-temperature service up to 400°C.
What is the difference between lever and gear operated butterfly valves?+
Lever operated valves use a manual handle for quick 90° rotation — suitable for valves up to DN300 where torque is manageable. Gear operated valves use a worm gear mechanism providing mechanical advantage — required for larger valves (DN150+) or high-pressure service where manual force would be excessive.
How often should butterfly valves be maintained?+
Recommended maintenance interval is 12-24 months depending on service conditions. Maintenance includes: seat condition inspection, shaft bearing lubrication, actuator servicing, bolt torque verification, and coating inspection. Harsh environments (sewage, chemicals) may require more frequent maintenance.
What is the pressure testing procedure for REW butterfly valves?+
Every valve undergoes: (1) Shell test at 1.5× working pressure for specified duration — no visible leakage permitted. (2) Seat test at 1.1× working pressure — zero visible leakage per API 598. (3) Torque test to verify smooth 90° operation. All tests are documented with certificates provided with every shipment.
Can REW manufacture custom-sized butterfly valves?+
Yes. REW can manufacture butterfly valves in custom sizes from DN50 to DN2500, custom pressure classes, special materials, and non-standard face-to-face dimensions. Custom drawings are typically delivered within 48 hours of specification confirmation.
What is the typical lead time for butterfly valve orders?+
Standard sizes (DN50-DN300): 2-4 weeks. Large sizes (DN350-DN600): 4-6 weeks. Special sizes (DN600+) or exotic materials: 6-10 weeks. Emergency orders can be expedited. Exact lead times confirmed at time of quotation based on current production schedule.
What actuator options are available?+
REW butterfly valves can be supplied with electric actuators (24V, 110V, 220V, 380V), pneumatic actuators (single-acting spring return or double-acting), hydraulic actuators, or manual gear operators. All actuators mount per ISO 5211 standard. Communication options include 4-20mA, Modbus, Profibus.
What coating options are available?+
Standard coating is fusion-bonded epoxy (FBE) in blue or green, 250 microns DFT. Options include: bitumen coating for underground service, hot-dip galvanizing, bare finish, and custom RAL colors. Special coatings available for corrosive environments. Coating specification confirmed at time of order.
What documentation is provided with each shipment?+
Standard documentation includes: Material Test Certificate (MTC) per EN 10204 3.1, Hydrostatic Test Report (shell and seat), Dimensional Inspection Report, Painting/Coating Certificate, Certificate of Compliance, and Installation/Maintenance Manual. Third-party inspection certificates available on request.
What is the warranty period for REW butterfly valves?+
Standard warranty is 12 months from date of commissioning or 18 months from date of shipment, whichever occurs first. Warranty covers manufacturing defects in materials and workmanship. Extended warranty available on request for critical applications.
Are spare parts available for REW butterfly valves?+
Yes. Complete spare parts inventory maintained for all standard sizes. Available spares include: discs, seat rings, shafts, bearings, gaskets, O-rings, actuators, and position indicators. Spare parts typically dispatched within 48-72 hours.
How do I select the correct butterfly valve type?+
Selection depends on: (1) Size and pressure — flanged for high pressure/large diameter, wafer for compact layouts, (2) Actuation — lever for small valves, gear for medium, motorized for automation, (3) Service media — determines seat material, (4) Installation — lug for dead-end service. Our technical team provides free selection guidance.
How do I request a quotation for butterfly valves?+
Submit your requirements via the quote form on this page, email rewpak@yahoo.com, or call +92 322 276 2222. Include: size, pressure class, material, type (wafer/lug/flanged), actuation (lever/gear/motorized), seat material, end connection, quantity, and application details. Technical team responds within 24 hours with specifications, lead time, and pricing.
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Health & Safety Management
PSQCA Mark
Pakistan Standards Certified
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