REW Signature Product · GV Series
Gate Valves
Rising & Non-Rising Spindle · 25mm – 2500mm
REW's flagship product line — engineered for on/off isolation in pipelines carrying water, steam, oil, gas and chemicals. Manufactured to BSS, ANSI and DIN standards with full-bore, low-resistance flow paths and zero-leakage shut-off.
Size Range
25mm to 2500mm
Pressure Class
PN10 – PN40
Standards
BSS · ANSI · DIN
Body Material
CI · CS · SS · Ductile
DETAIL · 01
Product Overview
The Industry Standard for Pipeline Isolation
A gate valve is a linear-motion valve used to start or stop fluid flow. When fully open, the gate is completely removed from the flow path, resulting in minimal pressure drop. REW has been manufacturing gate valves since 1948 — supplying Pakistan's largest utilities, defence projects, and heavy industry.
Every REW gate valve is hydrostatically tested, dimensionally inspected, and shipped with full material traceability and test certificates.
Zero Leakage
Metal-to-metal or resilient seated for bubble-tight shut-off
Low Pressure Drop
Full-bore design offers near-zero flow resistance when open
79+ Years
Trusted by WASA, DHA, Army, PAF and major industrial clients
Multi-Standard
BSS, ANSI, DIN, JIS — flanged, threaded or welded ends
Product Variants
Four Core Configurations
Each type engineered for specific pipeline requirements — from municipal water to high-pressure steam and oil transmission.
RS-GV
Type 01
Rising Spindle Gate Valve
OS&Y (Outside Screw & Yoke) design where the stem rises above the handwheel as the valve opens,
providing visual position indication. Ideal for above-ground installations and critical applications
where valve position must be immediately visible.
Visual position indicator — stem rises when opening
Protected stem threads — longer service life
Easier maintenance and lubrication access
Suitable for high-temperature applications
Size: 25mm – 1200mm (1" – 48")
Pressure: PN10 – PN40 / Class 150 – 300
Material: CI, CS, SS 304/316, Ductile Iron
Standard: BS 5163, API 600, DIN 3352
Primary Applications
Power Plants
Steam Lines
Above-Ground Pipelines
High-Temp Service
NRS-GV
Type 02
Non-Rising Spindle Gate Valve
Compact design where the stem rotates but doesn't rise vertically. The gate travels up and down
on the threaded stem while the handwheel remains stationary. Perfect for underground chambers,
valve pits, and installations with limited vertical clearance.
Space-saving design — no vertical stem movement
Ideal for underground and confined spaces
Lower overall height requirement
Cost-effective for water distribution
Size: 50mm – 600mm (2" – 24")
Pressure: PN10 – PN16 / Class 150
Material: CI, Ductile Iron, Bronze Trim
Standard: BS 5163, AWWA C509
Primary Applications
Underground Chambers
Water Distribution
Valve Pits
Municipal Systems
FW-GV
Type 03
Flanged Wedge Gate Valve
Industrial workhorse featuring solid or flexible wedge design with flanged ends for easy installation
and maintenance. The wedge-shaped gate provides tight shut-off and is available in various materials
for diverse industrial applications from water to aggressive chemicals.
Flexible wedge prevents thermal binding
Full-bore design for minimal pressure drop
Heavy-duty construction for industrial use
Bi-directional flow capability
Size: 50mm – 2500mm (2" – 100")
Pressure: Class 150 – 600 / PN10 – PN40
Wedge Type: Solid, Flexible, Split
Standard: API 600, API 602, BS 1414
Primary Applications
Oil & Gas
Chemical Plants
Refineries
Industrial Water
SL-GV
Type 04
Slab / Through-Conduit Gate Valve
Full-bore slab design with parallel gate faces enabling pigging operations in pipelines. Essential
for oil & gas transmission lines, this valve provides unobstructed flow when open and meets
API 6D specifications for pipeline service with double block and bleed capability.
Full-bore for pipeline pigging operations
Double block and bleed capability
API 6D compliant for pipeline service
Self-relieving seats for safety
Size: 100mm – 1200mm (4" – 48")
Pressure: Class 150 – 2500
Type: Expanding, Non-Expanding Slab
Standard: API 6D, API 600
Primary Applications
Oil & Gas Pipelines
Transmission Lines
Pigging Systems
High-Pressure Service
Manufacturing Process
Watch Our Production Line
See how REW gate valves are manufactured with precision engineering and 79 years of expertise.
REW Gate Valve Manufacturing
From casting to final testing — complete production process
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Applications
Serving 12+ Industries
REW gate valves are specified and re-ordered by Pakistan's most demanding organizations — from utilities to defence.
01
Water Supply
WASA, KWSB, municipal distribution, treatment plants
02
Wastewater
Sewage treatment, effluent handling, sludge lines
03
Hydropower
WAPDA projects, penstocks, turbine isolation
04
HVAC
Chilled water, heating circuits, steam distribution
05
Fire Protection
Hydrant systems, sprinkler mains, fire water storage
06
Chemical
SS valves for corrosive media, acid, alkali service
07
Sugar Mills
Process lines, steam systems, condensate return
08
Oil & Gas
Refineries, pipelines, OGDCL, PPL, PARCO terminals
09
Power Generation
Hydro, thermal, nuclear — WAPDA, K-Electric
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
Linear Motion Flow Control
Step-by-step operation sequence of a REW gate valve — from closed to fully open position.
01
Closed Position
The gate disc is fully seated against the seat rings, blocking all flow. The stem is in its lowest position with the handwheel fully clockwise.
02
Opening Sequence
Counter-clockwise rotation of the handwheel raises the stem. The gate lifts vertically from the seat, beginning to open the flow path.
03
Fully Open Position
The gate is completely withdrawn into the bonnet cavity. Full bore is established with minimal flow resistance and near-zero pressure drop.
04
Flow Characteristics
Gate valves are designed for on/off service only. Partial opening causes vibration and seat erosion — never used for throttling.
05
Pressure Behaviour
Bi-directional flow capability. Pressure rating maintained in both directions. Seat design prevents blow-out under full working pressure.
06
Design Advantages
Full bore, low pressure drop, bi-directional, minimal maintenance, long service life, suitable for high-pressure applications.
EXPLODED 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, SS, or ductile iron. Houses the flow passage and seat rings.
Bonnet
Covers the body opening and provides access for maintenance. Bolted, screwed, or pressure-sealed to the body.
Gate / Disc
The closure element. Solid, flexible, or split wedge design. SS 304/316, bronze, or gun metal. Provides shut-off.
Stem
Transmits handwheel motion to the gate. SS 304/316, EN8, EN19. Acme or trapezoidal threads for smooth operation.
Seat Rings
Precision-machined sealing surfaces. Integral or renewable. Metal-to-metal or resilient (EPDM, NBR, PTFE, Viton).
Packing & Gland
Prevents stem leakage. Graphite, PTFE, or asbestos-free packing. Gland follower compresses packing for seal.
Handwheel
Manual operating device. Cast iron or steel. Size proportional to valve torque requirements.
Yoke & Bush
Supports the stem and handwheel assembly. Bronze bush reduces friction. Yoke arms connect bonnet to yoke.
Materials of Construction
Material Specifications
Component-wise material selection based on service conditions, pressure class, and operating medium.
Materials · Component Breakdown
DOC · MAT-GV-2026
| Component | Material | Purpose | Advantages |
|---|---|---|---|
| Body | Cast Iron (GG25), Carbon Steel (WCB), SS 304/316, Ductile Iron (GGG40) | Primary pressure containment | High strength, corrosion resistance, cost-effective |
| Bonnet | Same as body material | Access cover, stem support | Matching thermal expansion, uniform strength |
| Gate / Disc | SS 304, SS 316, Bronze, Gun Metal | Flow closure element | Hardness, wear resistance, corrosion protection |
| Stem | SS 304, SS 316, EN8, EN19 (Chrome plated) | Motion transmission | High tensile strength, thread durability |
| Seat Rings | SS 304, SS 316, Bronze, Stellite overlay | Sealing surface | Bubble-tight shut-off, erosion resistance |
| Packing | Graphite, PTFE, Asbestos-free | Stem leakage prevention | Temperature resistance, chemical compatibility |
| Gland Follower | Carbon Steel, SS | Packing compression | Adjustable seal, maintenance access |
| Handwheel | Cast Iron, Steel | Manual operation | Ergonomic design, torque transmission |
| Bolts / Nuts | B7 / 2H, SS 304/316 | Bonnet-to-body joint | High tensile, temperature resistant |
| Gasket | Compressed asbestos-free, Spiral wound, PTFE | Bonnet sealing | Pressure integrity, chemical resistance |
| Bush / Yoke | Bronze (LG2), SS | Stem guidance, friction reduction | Low friction, wear resistance, self-lubricating |
Engineering Standards
Compliance & Certifications
Every REW gate valve is manufactured and tested to internationally recognized standards.
BS 5163
British Standard
Design, manufacture and testing of gate valves for waterworks purposes. Primary standard for municipal water applications.
API 600
American Petroleum Institute
Steel gate valves — flanged and butt-welding ends. Standard for oil, gas, and petrochemical industry applications.
API 602
API Compact Design
Compact steel gate valves for smaller sizes. Covers forged and cast construction for high-pressure service.
DIN 3352
German Standard
Gate valves for water supply. Specifies dimensions, materials, and testing requirements for European markets.
AWWA C509
American Water Works
Standard for resilient-seated gate valves for water supply service. Covers 3" through 48" sizes.
API 598
Valve Inspection & Testing
Standard testing procedures for all valve types. Shell test, seat test, and backseat test requirements.
ISO 5208
International Standard
Industrial valves — Pressure testing of metallic valves. Harmonized international testing protocol.
ASME B16.10
Face-to-Face Dimensions
Standardized face-to-face and end-to-end dimensions for valves. Ensures interchangeability.
BS 4504
Flange Standard
Circular flanges for pipes, valves and fittings. PN designated. Covers bolt patterns and dimensions.
Pressure Ratings
Working & Test Pressures
Pressure-temperature ratings for REW gate valves across all standard pressure classes.
| Pressure Class | Working Pressure (bar) | Shell Test (bar) | Seat Test (bar) | Temperature Limit |
|---|---|---|---|---|
| PN10 | 10 | 15 | 11 | -20°C to +120°C |
| PN16 | 16 | 24 | 17.6 | -20°C to +200°C |
| PN25 | 25 | 37.5 | 27.5 | -20°C to +300°C |
| PN40 | 40 | 60 | 44 | -20°C to +450°C |
| Class 150 | 19.6 | 29.4 | 21.6 | -29°C to +425°C |
| Class 300 | 50 | 75 | 55 | -29°C to +450°C |
| Class 600 | 100 | 150 | 110 | -29°C to +450°C |
Dimensional Information
Size & Weight Data
Select a size to view detailed dimensional data. All dimensions in millimeters unless otherwise specified.
DN50
DN100
DN150
DN200
DN300
DN400
Nominal Size (DN)50 mm
Face-to-Face (L)150 mm
Height (H)280 mm
Handwheel Diameter160 mm
Flange Diameter165 mm
Bolt Circle125 mm
No. of Bolts4
Weight (approx.)18 kg
The Forge
Manufactured With 79 Years of Mastery
From raw casting to final hydrostatic test — every REW gate 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, CS, SS
02
CNC Machining
CNC lathes and VMCs for seat, bore, flange and stem machining to ±0.05mm tolerance
03
Drilling & Threading
CNC drilling of flange bolt holes per BS/ANSI/DIN patterns. Acme thread cutting on stems
04
Assembly & Fitment
Skilled fitters assemble gate, stem, bonnet and packing with precision lapping
05
Pressure Testing
Shell test at 1.5× working pressure, seat test at 1.1× — per API 598 / BS 5163
06
Painting & Dispatch
Epoxy coating, marking, documentation pack with MTC, test certificate and dimensional report
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 / ISO 5208
Visual Inspection
Surface finish, casting defects, machining quality, assembly integrity
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 gate valve variants.
Download →
Product Catalogue
Full REW product range with technical data, applications, and ordering information.
Download →
Installation Manual
Step-by-step installation guide, torque specifications, 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 hydrostatic test reports, material test certificates, and inspection records.
Download →
Selection Guide
Technical guide for selecting the right gate valve for your application and service conditions.
Download →
Installed Projects
Trusted Across Pakistan
REW gate valves installed in critical infrastructure projects nationwide.
Water Supply
Lahore Water Treatment Plant
Lahore, Punjab
240+
Valves Installed
DN50-600
Size Range
2024
Completion
Oil & Gas
PARCO Oil Terminal Expansion
Mahmood Kot, Punjab
180+
Valves Supplied
API 600
Standard
2025
Phase 2
Hydropower
Diamer-Bhasha Dam Project
Gilgit-Baltistan
96
Penstock Valves
DN800
Max Size
2026
Ongoing
DHA Projects
DHA Lahore Phase 9 Infrastructure
Lahore, Punjab
320+
Valves Installed
DN50-400
Size Range
2025
Completed
Technical FAQ
Engineering Questions
Answers to the most common technical questions about REW gate valves.
What is the difference between rising and non-rising spindle gate valves?+
In a rising spindle (OS&Y) valve, the stem rises above the handwheel as the valve opens, providing visual position indication. In a non-rising spindle valve, the stem rotates but doesn't move vertically — the gate travels up and down on the threaded stem. Rising spindle is preferred for above-ground installations; non-rising is ideal for underground chambers with limited vertical clearance.
Can gate valves be used for throttling or flow regulation?+
No. Gate valves are designed for on/off service only. Partial opening causes vibration, seat erosion, and potential damage to the gate and seat. For throttling applications, use globe valves or butterfly valves.
What is the maximum operating temperature for REW gate valves?+
Maximum temperature depends on body material and seat type. Cast iron valves: up to 200°C. Carbon steel valves: up to 425°C. Stainless steel valves: up to 450°C. Resilient seated valves (EPDM/NBR): limited to 80-120°C depending on elastomer.
What standards do REW gate valves comply with?+
REW gate valves are manufactured to BS 5163, API 600, API 602, DIN 3352, and AWWA C509 standards. Testing is per API 598, ISO 5208, and BS 5163. Flanges conform to BS 4504, ANSI B16.5, and DIN 2501.
What materials are available for gate valve bodies?+
Standard body materials include Cast Iron (GG25), Ductile Iron (GGG40), Carbon Steel (WCB), Stainless Steel 304, and Stainless Steel 316. Special alloys available on request for corrosive or high-temperature service.
How often should gate valves be maintained?+
Recommended maintenance interval is 12-24 months depending on service conditions. Maintenance includes: operational test, packing adjustment/replacement, lubrication of stem threads, visual inspection for leakage, and bolt torque verification. Harsh environments may require more frequent maintenance.
What is the pressure testing procedure for REW gate 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) Backseat test for rising spindle valves. Test certificates are provided with every shipment.
Can REW manufacture custom-sized gate valves?+
Yes. REW can manufacture gate valves in custom sizes from DN25 to DN2500 (1" to 100"), 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 gate valve orders?+
Standard sizes (DN50-DN300): 2-4 weeks. Large sizes (DN350-DN600): 4-6 weeks. Special sizes (DN600+): 6-10 weeks. Emergency orders can be expedited. Exact lead times confirmed at time of quotation based on current production schedule.
What type of seat is best for my application?+
Metal-to-metal seats: high temperature, abrasive service, steam. EPDM: water service up to 80°C. NBR: oil and hydrocarbon service. PTFE: chemical service, wide temperature range. Viton: high temperature chemical service. Selection depends on medium, temperature, and pressure.
Are REW gate valves bi-directional?+
Yes. REW gate valves are designed for bi-directional flow. Pressure rating is maintained in both flow directions. However, for optimal sealing performance, installation with flow direction marked on the body is recommended when specified.
What coating options are available?+
Standard coating is fusion-bonded epoxy (FBE) in blue or green, 250-300 microns DFT. Options include: bitumen coating for underground service, hot-dip galvanizing, bare finish, and custom RAL colors. 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, Dimensional Inspection Report, Painting/Coating Certificate, Certificate of Compliance, and Installation/Maintenance Manual. Third-party inspection certificates available on request.
Can gate valves be automated?+
Yes. REW gate valves can be supplied with electric actuators, pneumatic actuators, or hydraulic actuators. Gear operators are standard for valves DN300 and above. Actuator sizing and mounting flanges per ISO 5211.
What is the difference between solid wedge and flexible wedge gate valves?+
Solid wedge: one-piece construction, suitable for most services, cost-effective. Flexible wedge: two-piece construction with flexible connection, accommodates thermal expansion and seat misalignment, preferred for high-temperature steam service and applications with thermal cycling.
How do I select the correct pressure class?+
Select pressure class based on maximum operating pressure plus 10-20% safety margin. PN16 for water distribution up to 16 bar. PN25/PN40 for industrial process lines. Class 150/300/600 for oil, gas, and high-pressure applications. Consult REW engineering team for critical applications.
What is the face-to-face dimension standard?+
Face-to-face dimensions follow BS 5163 for waterworks valves, API 600 for petroleum industry valves, DIN 3202 for German standard valves, and ASME B16.10 for general industrial valves. REW can manufacture to any of these standards as specified.
Are spare parts available for REW gate valves?+
Yes. Complete spare parts inventory maintained for all standard sizes. Available spares include: gate discs, seat rings, stems, packing sets, gaskets, bolts/nuts, handwheels, and bushings. Spare parts typically dispatched within 48-72 hours.
What is the warranty period for REW gate 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.
How do I request a quotation for gate 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, seat type, end connection, quantity, and application details. Technical team responds within 24 hours with specifications, lead time, and pricing.
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