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FAQ

VALVES & FITTINGS

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Brass Gate Valves Cast Iron Gate Valves Cast Steel Gate Valves Forged Steel Gate Valves Stainless Steel Gate Valves Rising Stem Gate Valves Non-rising Stem Gate Valves Double Disk Parallel Gas Gate Valves Knife Gate Valves Bellows Sealed Gate Valves

Globe Valves

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Cast Iron Globe Valves Cast Steel Globe Valves Forged Steel Globe Valves Stainless Steel Globe Valves Brass Globe Valves

Butterfly Valves

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Wafer Type Butterfly Valves Flange Type Butterfly Valves Eccentric Butterfly Valves Lug Type Butterfly Valves

Check Valves

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Cast Steel Check Valves Cast Iron Check Valves Stainless Steel Check Valves Brass Check Valves Lift Check Valves Swing Check Valves Forged Steel Check Valves

Ball Valves

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Cast Iron Ball Valves Cast Steel Ball Valves Stainless Steel Ball Valves Brass Ball Valves Fully Welded Ball Valves Electric Ball Valves Ceramic Core Ball Valves Multiport Ball Valves Rotary Valves Top Entry Ball Valves Floating Ball Valves High Pressure Ball Valves High Temperature Ball Valves V-port Ball Valves

Control Valves

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Globe Control Valves

Plug Valves

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Cast Iron Plug Valves

Regulating Valves

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Cast Iron Regulating Valves

Balance Valves

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Cast Iron Butterfly Balance Valve Cast Iron Internal Thread Globe Balance Valve Brass Balance Valve Number-lock Balance Valve

Safety Valves

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Closed Spring Loaded Full Bore Type Safety Valve Closed Spring Loaded Low Lift Type Safety Valve High Temperature And High Pressure Safety Valve Pilot Operated Safety Valve Spring Full Bore Type Safety Valve With Radiator Spring Full Bore Type With Lever Safety Valve Spring Loaded Low Lift External Thread Type Safety Valve Spring Loaded Low Lift Type Safety Valve Spring Loaded Low Lift Type With Lever Safety Valve Stainless Steel Spring Loaded Full Bore Type Safety Valve With Handle Twin Spring Type Safety Valve

Instrument Valves

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Needle Valves Other Valves

LNG Cryogenic Valves & Accessories

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LNG Filling Nozzle Cryogenic Gas Return Nozzle Cryogenic Gas Refueling Receptacle Cryogenic Gas Relief Valve Cryogenic Gas Shut-off Valve Cryogenic Gas Breakaway Coupling Cryogenic Gas Pressure Regulator Cryogenic Gas Check Valve

Pipeline Filters

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Cast Iron Filter Cast Steel Filter Stainless Steel Filter Brass Filter

Pipeline & Fittings

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Fittings

Flanges

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Blind Flange Lap Joint Flange Long Welding Neck Flange Slip-on Flange Socket Welding Flange Threaded Flange Welding Neck Flange Plate Flange Spectacle Blind Orifice Flange Tube Sheet Anchor Flange Swivel Flange Reducing Flange Loose Flange

Customization

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Two Way Distributing Valve Rotary Discharge Valve

Process Description of Dissolved Air Flotation

The feed water to the DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to coagulate the colloidal particles and/or a flocculant to conglomerate the particles into bigger clusters.

A portion of the clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called the air drum) into which compressed air is also introduced. This results in saturating the pressurized effluent water with air. The air-saturated water stream is recycled to the front of the float tank and flows through a pressure reduction valve just as it enters the front of the float tank, which results in the air being released in the form of tiny bubbles. Bubbles form at nucleation sites on the surface of the suspended particles, adhering to the particles. As more bubbles form, the lift from the bubbles eventually overcomes the force of gravity. This causes the suspended matter to float to the surface where it forms a froth layer which is then removed by a skimmer. The froth-free water exits the float tank as the clarified effluent from the DAF unit.

Some DAF unit designs utilize parallel plate packing material (e.g. lamellas) to provide more separation surface and therefore to enhance the separation efficiency of the unit.

DAF systems can be categorized as circular (more efficient) and rectangular (more residence time). The former type requires just 3 minutes. A particular circular DAF system is called "Zero speed", allowing quite water status then highest performances.

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