REW Signature Product · ST Series
Steam Traps
Thermodynamic · Thermostatic · Float · Inverted Bucket · 15mm – 300mm
Automatic condensate removal devices that discharge condensate, air and non-condensable gases from steam systems while preventing live steam loss. Essential for steam system efficiency, energy conservation and process optimization in sugar mills, textile mills, chemical plants and power projects.
Size Range
15mm to 300mm
Pressure Rating
PN10 – PN40
Standards
EN 26447 · ISO 6552
Body Material
CI · CS · SS
ISO 9001:2015 Certified
EN 26447 · ISO 6552 · ISO 6704
100% Factory Tested
Since 1948 · Lahore, Pakistan
79+ Years of Valve Engineering
ISO 9001:2015 Certified
EN 26447 · ISO 6552 · ISO 6704
100% Factory Tested
Since 1948 · Lahore, Pakistan
79+ Years of Valve Engineering
CROSS-SECTION · 01
Product Overview
The Guardian of Steam Efficiency
A steam trap is an automatic valve that removes condensate, air and non-condensable gases from steam systems while preventing the escape of live steam. Essential for maintaining steam system efficiency, preventing water hammer, reducing energy waste and ensuring optimal process performance.
REW manufactures steam traps in four core configurations — Thermodynamic, Thermostatic, Float & Thermostatic, and Inverted Bucket types — per EN 26447 and ISO 6552 standards, from DN15 to DN300, serving Pakistan's sugar mills, textile mills, chemical plants and power projects since 1948.
Energy Efficiency
Prevents live steam loss while removing condensate efficiently
Water Hammer Prevention
Prevents water hammer damage to pipes and equipment
Automatic Operation
Self-actuating — no external power or manual intervention required
Air Removal
Removes air and non-condensable gases for optimal heat transfer
Product Variants
Four Core Configurations
Each engineered for specific steam system requirements — from steam tracing to high-capacity process equipment drainage.
ST-TD
Type 01
Thermodynamic Steam Trap
Disc-type thermodynamic steam trap that operates on the difference in kinetic energy between steam and condensate. Compact, simple design with single moving part. Ideal for steam tracing, drip legs and process equipment drainage.
Single moving part — simple, reliable design
Compact size for steam tracing applications
Freeze resistant — suitable for outdoor installation
Wide operating pressure range
Size: 15mm – 50mm (½" – 2")
Pressure: PN10 – PN40 / Class 150 – 600
Material: CI, CS, SS
Standard: EN 26447, ISO 6552
Primary Applications
Steam Tracing
Drip Legs
Process Equipment
Outdoor Installation
ST-TS
Type 02
Thermostatic Steam Trap
Temperature-actuated steam trap that operates on the temperature difference between steam and condensate. Bimetallic or bellows element responds to temperature changes. Ideal for steam tracing, heating and process equipment where sub-cooling is acceptable.
Temperature-actuated operation
Sub-cools condensate for energy recovery
Freeze resistant — suitable for outdoor use
Excellent air venting capability
Size: 15mm – 50mm (½" – 2")
Pressure: PN10 – PN40 / Class 150 – 600
Material: CI, CS, SS
Standard: EN 26447, ISO 6552
Primary Applications
Steam Tracing
Heating
Process Equipment
Outdoor Use
ST-FT
Type 03
Float & Thermostatic Steam Trap
Combination float and thermostatic steam trap that combines continuous condensate removal with excellent air venting. Float mechanism provides continuous discharge while thermostatic element vents air and non-condensable gases. Ideal for process equipment and heat exchangers.
Continuous condensate discharge
Excellent air venting capability
High condensate capacity
Ideal for process equipment drainage
Size: 15mm – 150mm (½" – 6")
Pressure: PN10 – PN40 / Class 150 – 600
Material: CI, CS, SS
Standard: EN 26447, ISO 6552
Primary Applications
Process Equipment
Heat Exchangers
Autoclaves
Heat Tracing
ST-IB
Type 04
Inverted Bucket Steam Trap
Inverted bucket steam trap that operates on the difference in density between steam and condensate. Robust, reliable design with excellent condensate handling capacity. Ideal for process equipment, heat exchangers and drip legs where high condensate loads are present.
Robust, reliable design
High condensate handling capacity
Excellent for process equipment drainage
Wide operating pressure range
Size: 15mm – 150mm (½" – 6")
Pressure: PN10 – PN40 / Class 150 – 600
Material: CI, CS, SS
Standard: EN 26447, ISO 6552
Primary Applications
Process Equipment
Heat Exchangers
Drip Legs
High Condensate Load
Manufacturing Process
Watch Our Production Line
From raw casting to final testing — witness seven decades of valve engineering mastery in motion.
REW Steam Trap Manufacturing
From casting to final testing — complete production process
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Applications
Serving 40+ Industries
REW steam traps protect Pakistan's most critical steam systems — from sugar mills to power plants.
01
Sugar Mills
Juice heaters, evaporators, vacuum pans, crystallizers
02
Textile Mills
Dyeing machines, dryers, steamers, calenders
03
Power Generation
Steam turbines, heat exchangers, steam tracing
04
Chemical Plants
Reactors, heat exchangers, distillation columns
05
HVAC Systems
Heating coils, unit heaters, steam tracing
06
Food Processing
Sterilizers, cookers, dryers, steam jackets
07
Pharmaceutical
Autoclaves, sterilizers, clean steam systems
08
Paper Mills
Dryers, cylinders, steam heated rollers
09
Rubber Industry
Vulcanizers, autoclaves, steam heated presses
10
Laundry & Dry Cleaning
Presses, dryers, steam heated equipment
11
Oil & Gas
Refineries, pipelines, steam tracing
12
Cement Plants
Steam heating, process equipment
Working Principle
Automatic Condensate Removal
Step-by-step operation sequence of a REW thermodynamic steam trap — from condensate discharge to steam trapping.
01
Condensate Entry
Condensate and air enter the steam trap from the steam system. The disc is lifted by the pressure of incoming condensate, allowing discharge.
02
Condensate Discharge
Condensate flows through the trap and is discharged to the condensate return system. Air and non-condensable gases are also vented.
03
Steam Arrival
When live steam reaches the trap, it creates a pressure differential that forces the disc against the seat, closing the valve and preventing steam loss.
04
Steam Trapping
The disc remains closed, trapping live steam in the system while condensate accumulates. This cycle repeats continuously for efficient steam system operation.
05
Continuous Operation
The thermodynamic steam trap operates automatically without external power, responding to the thermodynamic properties of steam and condensate for efficient operation.
06
Energy Efficiency
By preventing live steam loss while removing condensate, steam traps improve steam system efficiency, reduce energy waste and prevent water hammer damage.
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, CS or SS. Houses the disc mechanism and flow passages.
Cover / Cap
Covers the body opening and provides access for disc inspection and maintenance. Bolted or screwed design.
Disc
The moving element that opens and closes to discharge condensate and trap steam. SS or hardened steel construction.
Seat
Precision-machined sealing surface. Hardened steel or stainless steel for long service life and tight shut-off.
Strainer Screen
Stainless steel strainer screen protects the disc from debris and pipe scale. Removable for cleaning.
Thermostatic Element
Bimetallic or bellows element (thermostatic traps) that responds to temperature changes for automatic operation.
Float
Stainless steel float (float traps) that rises and falls with condensate level for continuous discharge.
Inverted Bucket
Inverted bucket (inverted bucket traps) that operates on density difference between steam and condensate.
Technical Specifications
The Engineering Ledger
Complete specification sheet for REW Steam Traps — every dimension, material, and standard documented for your engineering team.
Steam Trap · Full Specification
DOC · ST-SPEC-2026
| Product Name | Steam Trap — Thermodynamic, Thermostatic, Float & Thermostatic, Inverted Bucket |
|---|---|
| Size Range | 15 mm (½") to 300 mm (12") |
| Pressure Rating | PN10, PN16, PN25, PN40 · Class 150, 300, 600 |
| Body Material | Cast Iron (GG25), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
| Disc Material | Stainless Steel 304, Stainless Steel 316, Hardened Steel |
| Seat Material | Stainless Steel, Hardened Steel |
| Strainer Screen | Stainless Steel 304 — removable for cleaning |
| Thermostatic Element | Bimetallic or Bellows (thermostatic traps) |
| Float | Stainless Steel 304 (float traps) |
| Inverted Bucket | Stainless Steel 304 (inverted bucket traps) |
| End Connection | Threaded (BSP/NPT), Flanged (EN 1092-2, ANSI B16.5), Socket Weld |
| Operating Temperature | -10°C to +400°C (depending on type and material) |
| Design Standards | EN 26447, ISO 6552, ISO 6704 |
| Testing Standard | EN 26447, ISO 6552 |
| Coating / Paint | Epoxy Coated, Bare Finish |
| Applications | Steam Tracing, Process Equipment, Heat Exchangers, Autoclaves, Dryers |
| Certification | ISO 9001:2015 · ISO 14001:2015 · ISO 45001:2018 · PSQCA |
| Origin | Manufactured in Lahore, Pakistan — Since 1948 |
Engineering Standards
Compliance & Certifications
Every REW steam trap is manufactured and tested to internationally recognized standards.
EN 26447
European Standard
Industrial steam traps — Classification, design, testing and marking. Primary European standard for steam traps.
ISO 6552
International Standard
Steam traps — Vocabulary. International standard for steam trap terminology and classification.
ISO 6704
International Standard
Steam traps — Classification and designation. International standard for steam trap classification.
ISO 7841
International Standard
Steam traps — Capacity testing method. International standard for steam trap capacity testing.
ISO 7842
International Standard
Steam traps — Air discharge capacity testing. International standard for air venting capacity.
ISO 6553
International Standard
Steam traps — Marking. International standard for steam trap marking and identification.
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 150, 300, 600 ratings for American market compliance.
ISO 9001:2015
Quality Management
Quality management system certified. Every steam trap traceable from raw material to final test.
Pressure Ratings
Working & Test Pressures
Pressure-temperature ratings for REW steam traps across all standard pressure classes.
| Pressure Class | Working Pressure (bar) | Test Pressure (bar) | Temperature Limit |
|---|---|---|---|
| PN10 | 10 | 15 | -10°C to +200°C |
| PN16 | 16 | 24 | -10°C to +200°C |
| PN25 | 25 | 37.5 | -10°C to +300°C |
| PN40 | 40 | 60 | -10°C to +400°C |
| Class 150 | 19.6 | 29.4 | -10°C to +200°C |
| Class 300 | 50 | 75 | -10°C to +300°C |
| Class 600 | 100 | 150 | -10°C to +400°C |
Dimensional Information
Size & Weight Data
Select a size to view detailed dimensional data for REW steam traps. All dimensions in millimeters.
DN15
DN20
DN25
DN32
DN40
DN50
Nominal Size (DN)15 mm
Face-to-Face (L)100 mm
Height (H)95 mm
Width (W)75 mm
ConnectionThreaded BSP
Weight (approx.)1.2 kg
The Forge
Forged with 79 Years of Mastery
From raw casting to final testing — every REW steam trap 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, CS, SS
02
CNC Machining
CNC lathes and VMCs for seat, bore, disc and body machining to precise tolerances
03
Disc & Seat Lapping
Precision lapping of disc-to-seat interface for tight shut-off. Hardened surfaces for long life
04
Assembly
Precision assembly of disc, seat, strainer and cover. Thermostatic element installation (thermostatic traps)
05
Testing
100% factory testing per EN 26447 and ISO 6552 standards. Capacity and performance verification
06
Painting & Dispatch
Epoxy coating, marking, documentation pack with test certificate and installation manual
FACILITY · LHR
CNC Machining · Lahore Plant
Quality Assurance
Zero-Defect Philosophy
Every steam trap undergoes rigorous inspection and testing before dispatch. Our quality system is certified to ISO 9001:2015.
Incoming Inspection
Raw material verification — chemical composition and mechanical properties per standards
Dimensional Inspection
Precision instruments verify all critical dimensions against approved drawings
Pressure Testing
100% factory pressure testing per EN 26447 and ISO 6552 standards
Capacity Testing
Condensate discharge capacity and air venting capacity verification per ISO 7841 and ISO 7842
Visual Inspection
Surface finish, casting defects, machining quality, assembly integrity
Coating Inspection
DFT measurement, adhesion test for epoxy coatings
Identification Marking
Size, pressure class, material grade, manufacturer logo — permanently marked
Documentation
Test certificates, dimensional reports, installation manual — complete documentation
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 steam trap 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, troubleshooting, spare parts list, 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 test reports, material test certificates, and inspection records.
Download →
Selection Guide
Technical guide for selecting the right steam trap type and size for your application.
Download →
Installed Projects
Trusted Across Pakistan
REW steam traps installed in critical steam systems across Pakistan's industries.
Sugar Mills
Chashma Sugar Mill Expansion
Mianwali, Punjab
500+
Steam Traps Installed
DN15-150
Size Range
2026
Ongoing
Textile Mills
Nishat Textile Mills
Faisalabad, Punjab
800+
Steam Traps Supplied
DN15-100
Size Range
2025
Completed
Chemical Plants
Engro Chemical Plant
Karachi, Sindh
350+
Steam Traps Installed
DN15-80
Size Range
2025
Completed
Power Generation
Muzaffargarh Power Station
Muzaffargarh, Punjab
250+
Steam Traps Installed
DN15-100
Size Range
2025
Completed
Technical FAQ
Engineering Questions
Answers to the most common technical questions about REW steam traps.
What is a steam trap and why is it important?+
A steam trap is an automatic valve that removes condensate, air and non-condensable gases from steam systems while preventing the escape of live steam. Steam traps are essential for maintaining steam system efficiency, preventing water hammer damage, reducing energy waste and ensuring optimal process performance.
What are the different types of steam traps REW manufactures?+
REW manufactures four core configurations: (1) Thermodynamic — disc-type operating on kinetic energy difference, (2) Thermostatic — temperature-actuated with bimetallic or bellows element, (3) Float & Thermostatic — combination float and thermostatic for continuous discharge with air venting, (4) Inverted Bucket — operates on density difference between steam and condensate.
What is the size range for REW steam traps?+
REW manufactures steam traps from DN15 to DN300 (½" to 12"). Thermodynamic and thermostatic traps available from 15mm to 50mm. Float and inverted bucket traps available from 15mm to 150mm.
What pressure ratings are available?+
REW steam traps are available in PN10, PN16, PN25, PN40 and Class 150, 300, 600. Operating temperature range from -10°C to +400°C depending on type and material.
What standards do REW steam traps comply with?+
REW steam traps are manufactured to EN 26447, ISO 6552 and ISO 6704 standards. Testing is per EN 26447 and ISO 6552. Flanges conform to BS 4504 and ANSI B16.5.
What body materials are available?+
Standard body materials include Cast Iron (GG25), Carbon Steel (WCB), and Stainless Steel (CF8/CF8M). Disc and seat materials include stainless steel and hardened steel for long service life.
How do I select the correct steam trap type?+
Selection depends on: (1) Application — steam tracing, process equipment, drip legs, (2) Condensate load — continuous or intermittent, (3) Pressure and temperature — operating conditions, (4) Air venting requirement — thermostatic element for air removal. Our technical team provides free selection guidance.
How often should steam traps be maintained?+
Recommended maintenance interval is 12 months depending on service conditions. Maintenance includes: visual inspection, strainer cleaning, disc and seat inspection, and performance testing. Harsh environments may require more frequent maintenance.
What is the typical lead time for steam trap orders?+
Standard sizes (DN15-DN50): 2-4 weeks. Larger sizes (DN50-DN150): 4-6 weeks. Special sizes or exotic materials: 6-10 weeks. Emergency orders can be expedited. Exact lead times confirmed at time of quotation.
What documentation is provided with each shipment?+
Standard documentation includes: Test Certificate per EN 26447 and ISO 6552, Dimensional Inspection Report, Installation Manual, and Material Test Certificate. Third-party inspection certificates available on request.
Related Products
Complete Your Steam System
Explore the full REW product range — engineered to work together as a complete steam system solution.
ISO 9001:2015
Quality Management
ISO 14001:2015
Environmental Management
ISO 45001:2018
Health & Safety Management
PSQCA Mark
Pakistan Standards Certified
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