Diaphragm Valve

As a Diaphragm Valve Supplier in Dubai, UAE Valves supplies manual and actuated diaphragm valves designed for reliable shutoff and smooth throttling on clean, corrosive, and lightly abrasive services. The flexible diaphragm seals against a weir or straight-through seat, creating a clean flow path with modest pressure loss and simple maintenance. These valves are widely used as pump isolation valves and corrosion resistant control valves in water, chemical, and utility systems.

How Diaphragm Valves Work

• Closing: Turning the handwheel or driving the actuator pushes a compressor that flexes the diaphragm down onto the seat, stopping flow.
• Opening: Lifting the diaphragm clears the bore and allows fluid to pass.
• Weir pattern: Requires shorter diaphragm travel, offering fine throttling control.
• Straight-through pattern: Provides an unobstructed bore, suitable for slurries and higher solids content.
• Isolation: The diaphragm completely separates the stem and bonnet from the process media, essential when handling corrosive or particulate-laden fluids.

Benefits

• Tight shutoff with the process isolated from moving parts
• Good throttling control, especially in the weir pattern
• Low maintenance due to few wetted moving components
• Suitable for corrosive and seawater media when paired with lined or alloy bodies and elastomer diaphragms
• Clean, streamlined flow path that resists clogging and reduces pressure drop
• Spares and diaphragm replacement kits available for long-term support

Types Offered

• Cast Iron Diaphragm Valve – economical choice for utility water and non-corrosive services
• Ductile Iron Diaphragm Valve – higher strength body for moderate pressures in water and seawater duties
• Electric Actuated Diaphragm Valve – precise positioning for automated control loops
• Pneumatic Actuated Diaphragm Valve – fast, fail-safe operation for shutoff and modulation

Industries Served

• Water & Desalination – intake, pretreatment, chemical dosing, and RO reject lines
• Petrochemical & Chemical – acids, alkalis, brine, and utility service
• Mining & Minerals – reagent lines and light slurry applications
• Power Generation – demineralized water, chemical dosing, and plant utilities
• Marine & Offshore – seawater and ballast systems

Technical Specifications

• Size range: DN 15 to DN 600 (½ in to 24 in)
• Pressure ratings: typically PN 10 to PN 16; ASME Class 150 on selected sizes
• Temperature range: −10 °C to +180 °C depending on body, lining, and diaphragm material; higher available with elastomer upgrades
• End connections: flanged to ASME B16.5 or EN 1092; threaded and weld ends on request
• Patterns: weir and straight-through
• Actuation: manual handwheel, pneumatic, or electric with limit and position feedback
• Control characteristics: near-linear on weir pattern, high Cv on straight-through

Design Standards

• MSS SP 88 – diaphragm valves
• EN 558 / ISO 5752 – face-to-face dimensions
• ASME B16.34 – design and pressure-temperature ratings where applicable
• ASME B16.5 / EN 1092 – flange standards
• ISO 5211 – topworks for actuator mounting

Inspection and Testing

• Hydrostatic shell and seat testing to ISO 5208 / EN 12266
• Functional stroke checks with travel and position verification
• Leak tightness verification at set differential pressure
• Material traceability to EN 10204 3.1 with serial-level data
• Certification packs including diaphragm batch certificates available on request
• Third-party inspection available on request

Body and Trim Material Compatibility

Special Features

• Weir and straight-through bodies to suit throttling or slurry duty
• Visual position indicators and mechanical travel stops for repeatable settings
• Lockable handwheels and rising stem indicators for safe operation
• Purge or flush ports on straight-through bodies to clear fines
• Low emission bonnet options and stainless external fasteners for coastal sites
• Diaphragm failure detection ports and maintenance-friendly bonnet designs
• Customisation available for body materials, elastomer selection, and actuation options to meet local project conditions