REW Signature Product · ARV Series
Air Release Valves
Single Action · Double Action · Combination · 15mm – 300mm
Automatic air release and vacuum break valves for pipeline protection. Automatically releases trapped air during pipeline filling and admits air during draining to prevent vacuum formation and pipeline collapse.
Size Range
15mm to 300mm
Pressure Class
PN10 – PN25
Standards
EN 1074-4 · AWWA C512
Body Material
CI · DI · CS · SS
ISO 9001:2015 Certified
EN 1074-4 · AWWA C512
Automatic Air Release
Since 1948 · Lahore, Pakistan
79+ Years of Valve Engineering
ISO 9001:2015 Certified
EN 1074-4 · AWWA C512
Automatic Air Release
Since 1948 · Lahore, Pakistan
79+ Years of Valve Engineering
CROSS-SECTION · 01
Product Overview
The Guardian of Pipeline Integrity
Air release valves are essential pipeline protection devices that automatically release trapped air during pipeline filling and admit air during draining to prevent vacuum formation and pipeline collapse.
REW manufactures air release valves in four core configurations — Single Action, Double Action, Combination and Spindle Loaded types — per EN 1074-4 and AWWA C512 standards, from DN15 to DN300, serving Pakistan's water utilities, irrigation systems and industrial facilities since 1948.
Automatic Operation
Self-actuating — releases air and admits air automatically without external power
Pipeline Protection
Prevents air locks and vacuum collapse in pipelines
High Efficiency
Rapid air release during filling, controlled air admission during draining
Multiple Configurations
Single, Double, Combination and Spindle Loaded types available
Product Variants
Four Core Configurations
Each engineered for specific air release challenges — from small bore residential systems to large bore municipal water mains.
ARV-SA
Type 01
Single Action Air Release
Automatic air release valve that automatically releases trapped air during pipeline filling. The float rises with water level and closes the orifice when water reaches the valve. Prevents air locks in pipelines.
Automatic air release during pipeline filling
Float-operated mechanism
Prevents air locks in pipelines
Small orifice for controlled air release
Size: 15mm – 50mm (½" – 2")
Pressure: PN10 – PN25
Material: CI, DI, CS, SS
Standard: EN 1074-4, AWWA C512
Primary Applications
Water Mains
Pipeline Protection
Water Treatment
Irrigation
ARV-DA
Type 02
Double Action Air Release
Combination air release and vacuum break valve. Automatically releases air during pipeline filling AND admits air during pipeline draining to prevent vacuum formation and pipeline collapse. Dual protection in one valve.
Automatic air release AND vacuum break
Prevents vacuum collapse during draining
Dual protection in single valve body
Large and small orifice combination
Size: 15mm – 300mm (½" – 12")
Pressure: PN10 – PN25
Material: CI, DI, CS, SS
Standard: EN 1074-4, AWWA C512
Primary Applications
Water Mains
Pipeline Protection
Pumping Stations
Water Treatment
ARV-CO
Type 03
Combination Air Release
Large orifice combination air release valve for high-volume air release applications. Features both large orifice for rapid air release during filling and small orifice for continuous air release during operation.
Large orifice for rapid air release
Small orifice for continuous air release
High-volume air release capability
Dual orifice design
Size: 50mm – 300mm (2" – 12")
Pressure: PN10 – PN25
Material: CI, DI, CS, SS
Standard: EN 1074-4, AWWA C512
Primary Applications
Large Water Mains
Pumping Stations
Water Treatment
Irrigation
ARV-SL
Type 04
Spindle Loaded Air Release
Manual override air release valve with spindle-loaded mechanism. Allows controlled manual air release and isolation. Ideal for applications requiring manual control and isolation capability.
Manual override capability
Spindle-loaded mechanism
Controlled air release
Isolation capability
Size: 15mm – 300mm (½" – 12")
Pressure: PN10 – PN25
Material: CI, DI, CS, SS
Standard: EN 1074-4, AWWA C512
Primary Applications
Water Mains
Pumping Stations
Water Treatment
Irrigation
Manufacturing Process
Watch Our Production Line
From raw casting to final testing — witness seven decades of valve engineering mastery in motion.
REW Air Release Valve Manufacturing
From casting to final testing — complete production process
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Applications
Serving 40+ Industries
REW air release valves protect Pakistan's most critical pipeline infrastructure — from water utilities to irrigation systems.
01
Water Supply
WASA, KWSB, municipal distribution, treatment plants
02
Irrigation
Canal projects, tube wells, agricultural distribution
03
HVAC
Chilled water, heating circuits, cooling towers
04
Chemical
SS valves for corrosive media, acid, alkali service
05
Sugar Mills
Process lines, steam systems, condensate return
06
Oil & Gas
Refineries, pipelines, OGDCL, PPL, PARCO terminals
07
Power Generation
Hydro, thermal — WAPDA, K-Electric, NEPRA
08
Mining
Slurry lines, dewatering, mineral processing
09
Food Processing
Sanitary lines, CIP systems, steam sterilization
10
Textile
Dyeing, steam distribution, process water
11
Fire Protection
Hydrant systems, sprinkler mains, fire water storage
12
Wastewater
Sewage treatment, effluent handling, sludge lines
Working Principle
Automatic Air Release
Step-by-step operation sequence of a REW air release valve — from air release to vacuum break protection.
01
Pipeline Filling
As pipeline fills with water, air accumulates at high points. Air release valve automatically opens to release trapped air.
02
Air Release
Float rises with water level. When water reaches valve, float closes orifice to prevent water loss.
03
Normal Operation
During normal operation, small orifice continuously releases any accumulated air to maintain pipeline efficiency.
04
Pipeline Draining
During pipeline draining, vacuum forms. Valve automatically opens to admit air and prevent vacuum collapse.
05
Vacuum Break
Air admission prevents vacuum formation that could collapse pipeline. Protects pipeline integrity during draining.
06
Continuous Protection
Automatic operation ensures continuous pipeline protection — no external power, no manual intervention required.
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 float mechanism and orifice.
Cover / Bonnet
Covers the body opening and provides access for float inspection and maintenance. Bolted design.
Float
Float mechanism that rises with water level to close orifice. SS or plastic construction for corrosion resistance.
Orifice
Controlled orifice for air release. Small orifice for continuous air release, large orifice for rapid air release during filling.
Seat
Precision-machined sealing surface. EPDM, NBR, or PTFE seat for bubble-tight shut-off.
Spindle (Spindle Loaded Type)
Manual override spindle for controlled air release and isolation capability.
Gasket
EPDM or NBR gasket between body and cover for pressure integrity.
Bolts & Nuts
SS or MS bolts secure cover to body. Torqued to specification for leak-free joint.
Technical Specifications
The Engineering Ledger
Complete specification sheet for REW Air Release Valves — every dimension, material, and standard documented for your engineering team.
Air Release Valve · Full Specification
DOC · ARV-SPEC-2026
| Product Name | Air Release Valve — Single Action, Double Action, Combination, Spindle Loaded |
|---|---|
| Size Range | 15 mm (½") to 300 mm (12") |
| Pressure Rating | PN10, PN16, PN25 |
| Body Material | Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
| Float Material | Stainless Steel, Plastic (PP, PE) |
| Seat Material | EPDM, NBR, PTFE — selected based on media and temperature |
| Gasket Material | EPDM, NBR — for pressure integrity |
| End Connection | Flanged (EN 1092-2, ANSI B16.5) / Threaded (BSP/NPT) |
| Operating Temp | -10°C to +80°C (depending on seat material) |
| Operation | Automatic (float-operated) / Manual (spindle loaded) |
| Design Standards | EN 1074-4, AWWA C512 |
| Flange Standard | BS 4504, ANSI B16.5, DIN 2501, EN 1092 |
| Testing Standard | EN 1074-4, API 598 — Pressure and Function Test |
| Coating / Paint | Epoxy Coated (Fusion Bonded), Bitumen, Hot-Dip Galvanized |
| Applications | Water, Wastewater, Irrigation, HVAC, Industrial |
| Certification | ISO 9001:2015 · ISO 14001:2015 · ISO 45001:2018 · PSQCA |
| Origin | Manufactured in Lahore, Pakistan — Since 1948 |
Engineering Standards
Compliance & Certifications
Every REW air release valve is manufactured and tested to internationally recognized standards.
EN 1074-4
European Standard
Valves for water supply — Air valves. Primary design standard for REW air release valves.
AWWA C512
American Water Works
Air-release, air-vacuum, and combination air valves for waterworks service.
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 ratings for American market compliance.
DIN 2501
German Flange Standard
Flanges and their joints. PN designated flanges for European market compliance.
EN 1092
European Flange Standard
Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories.
API 598
Valve Testing
Standard testing procedures for all valve types. Pressure and function test requirements.
ISO 9001:2015
Quality Management
Quality management system certified by TÜV Austria. Every valve traceable from raw material to final test.
PSQCA
Pakistan Standards
Pakistan Standards Quality Control Authority certification for quality assurance.
Pressure Ratings
Working & Test Pressures
Pressure-temperature ratings for REW air release valves across all standard pressure classes.
| Pressure Class | Working Pressure (bar) | Test Pressure (bar) | Temperature Limit |
|---|---|---|---|
| PN10 | 10 | 15 | -10°C to +80°C |
| PN16 | 16 | 24 | -10°C to +80°C |
| PN25 | 25 | 37.5 | -10°C to +80°C |
Dimensional Information
Size & Weight Data
Select a size to view detailed dimensional data for air release valves. All dimensions in millimeters.
DN15
DN25
DN50
DN100
DN150
DN200
DN300
Nominal Size (DN)15 mm
Height (H)180 mm
Flange Diameter95 mm
Bolt Circle65 mm
No. of Bolts4
Bolt DiameterØ12 mm
Weight (approx.)2.5 kg
The Forge
Forged with 79 Years of Mastery
From raw casting to final testing — every REW air release 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, flange and body machining to precise tolerances
03
Float Assembly
Precision float mechanism assembled with seat for automatic air release operation
04
Assembly & Testing
Complete assembly with gasket, cover and bolts. Function test for automatic operation
05
Pressure Testing
Shell test at 1.5× working pressure, function test for air release operation
06
Painting & Dispatch
Epoxy coating, marking, documentation pack with 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
Dimensional Inspection
Precision instruments verify all critical dimensions against approved drawings
Pressure Test
1.5× working pressure held for specified duration. No visible leakage permitted
Function Test
Automatic air release and vacuum break function verified
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 — complete traceability
QA LAB · LHR
Technical Resources
Download Documentation
Complete technical documentation for engineering, procurement, and installation teams.
Technical Datasheet
Complete specifications, materials, dimensions for all air release valve variants.
Download →
Product Catalogue
Full REW product range with technical data, applications, and ordering information.
Download →
Installation Manual
Step-by-step installation guide and commissioning procedures.
Download →
Maintenance Manual
Preventive maintenance schedules and overhaul procedures.
Download →
CAD Drawings
2D and 3D CAD files in DWG, STEP, and IGES formats.
Download →
Certificates
ISO 9001, ISO 14001, ISO 45001, PSQCA certificates.
Download →
Test Reports
Sample test reports and inspection records.
Download →
Selection Guide
Technical guide for selecting the right air release valve.
Download →
Installed Projects
Trusted Across Pakistan
REW air release valves installed in critical infrastructure projects nationwide.
Water Supply
Lahore Water Treatment Plant
Lahore, Punjab
120+
Valves Installed
DN50-300
Size Range
2024
Completion
Oil & Gas
PARCO Oil Terminal Expansion
Mahmood Kot, Punjab
85+
Valves Supplied
PN25
Pressure Class
2025
Phase 2
Power Generation
Muzaffargarh Power Station
Muzaffargarh, Punjab
65+
Valves Installed
PN40
Pressure Class
2025
Completed
Sugar Mills
Chashma Sugar Mill Expansion
Mianwali, Punjab
95+
Valves Installed
DN50-200
Size Range
2026
Ongoing
Technical FAQ
Engineering Questions
Answers to the most common technical questions about REW air release valves.
What is the difference between single action and double action air release valves?+
Single action air release valves automatically release air during pipeline filling only. Double action (combination) air release valves both release air during filling AND admit air during draining to prevent vacuum formation. Double action provides complete pipeline protection.
What are the four types of air release valves REW manufactures?+
REW manufactures four core configurations: (1) Single Action — automatic air release during filling, (2) Double Action — air release and vacuum break, (3) Combination — large and small orifice combination, (4) Spindle Loaded — manual override capability.
What is the size range for REW air release valves?+
REW manufactures air release valves from DN15 to DN300 (½" to 12"). Single action types available from 15mm to 50mm. Double action and combination types from 15mm to 300mm.
What pressure ratings are available?+
REW air release valves are available in PN10, PN16, and PN25 pressure ratings. Shell test is performed at 1.5× working pressure per EN 1074-4 standards.
What standards do REW air release valves comply with?+
REW air release valves are manufactured to EN 1074-4 and AWWA C512 standards. Flanges conform to BS 4504, ANSI B16.5, DIN 2501 and EN 1092. Testing is per EN 1074-4 and API 598.
What body materials are available?+
Standard body materials include Cast Iron (GG25), Ductile Iron (GGG40/50), Carbon Steel (WCB), and Stainless Steel (CF8/CF8M). Float materials include stainless steel and plastic (PP, PE).
How do air release valves work?+
Air release valves use a float mechanism. During pipeline filling, air accumulates and float rises to close orifice when water reaches valve. During draining, vacuum forms and valve opens to admit air, preventing pipeline collapse.
Where should air release valves be installed?+
Air release valves should be installed at high points in pipelines where air naturally accumulates. Typical locations include pipeline peaks, pump discharge, and high points in distribution systems.
How often should air release valves be maintained?+
Recommended maintenance interval is 12-24 months depending on service conditions. Maintenance includes: float inspection, seat condition check, gasket inspection, and function test.
What is the pressure testing procedure for REW air release valves?+
Every valve undergoes: (1) Shell test at 1.5× working pressure — no visible leakage permitted. (2) Function test for automatic air release and vacuum break operation. All tests documented with certificates.
Can REW manufacture custom-sized air release valves?+
Yes. REW can manufacture air release valves in custom sizes from DN15 to DN300, custom pressure classes, special materials, and custom configurations. Custom drawings delivered within 48 hours.
What is the typical lead time for air release valve orders?+
Standard sizes (DN15-DN150): 2-4 weeks. Large sizes (DN200-DN300): 4-6 weeks. Custom sizes or special materials: 6-10 weeks. Emergency orders can be expedited.
What seat materials are available?+
REW offers EPDM seats for water service up to 80°C, NBR seats for oil service, and PTFE seats for chemical service. Seat material is matched to the service media and temperature.
What is the difference between large orifice and small orifice air release valves?+
Large orifice valves release large volumes of air rapidly during pipeline filling. Small orifice valves continuously release small amounts of air during normal operation. Combination valves have both orifices for complete protection.
What coating options are available?+
Standard coating is fusion-bonded epoxy (FBE). Options include: bitumen coating for underground service, hot-dip galvanizing, and custom RAL colors. Coating specification confirmed at time of order.
What documentation is provided with each shipment?+
Standard documentation includes: Test Report, Dimensional Inspection Report, Certificate of Compliance, and Installation/Maintenance Manual. Third-party inspection certificates available on request.
What is the warranty period for REW air release 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.
Are spare parts available for REW air release valves?+
Yes. Complete spare parts inventory maintained for all standard sizes. Available spares include: floats, seats, gaskets, bolts/nuts, and covers. Spare parts typically dispatched within 48-72 hours.
How do I select the correct air release valve type?+
Selection depends on: (1) Pipeline size — determines valve size, (2) Pressure class — determines pressure rating, (3) Media — determines seat material, (4) Application — single action for filling only, double action for complete protection. Our technical team provides free selection guidance.
How do I request a quotation for air release 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 (single/double/combination/spindle), quantity, and application details. Technical team responds within 24 hours.
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ISO 14001:2015
Environmental Management
ISO 45001:2018
Health & Safety Management
PSQCA Mark
Pakistan Standards Certified
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