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Diverter valves for powder, pellet and liquid flow diversion in flap, plug and tunnel designs, manual and pneumatic, in aluminium, cast iron and stainless steel.
A diverter valve routes a single incoming flow to one of two or more outlets, or converges multiple sources into one line. In bulk solids handling — flour, sugar, cement, plastic granules, minerals — diverters sit under silos and in pneumatic conveying lines, built as flap diverters (a pivoting blade in a Y or K shaped housing), rotary plug diverters (a drilled plug turning between ports, preferred for pressure conveying because it preserves the pipe bore), and tunnel or slide diverters for gravity chutes. For liquids, diverting ball and plug valves with L-port or T-port bores route product between tanks, and sanitary divert valves serve food and pharmaceutical lines. Bodies are cast aluminium for light powders, cast iron for minerals and cement, and stainless steel 304/316 with polished contact surfaces and food-grade seals for hygienic duties; hygienic designs can be supplied to 3-A and EHEDG practice. Pneumatic cylinder actuation with position switches is standard for automated plants, with manual lever versions for occasional switching. Line sizes commonly run DN50 to DN400, with conveying pressures to about 3.5 bar for plug diverters. When enquiring, state the conveyed material and its abrasiveness, dilute or dense phase, line size and pressure, orientation (gravity or in-line), outlet angle, body material, seal type, actuation and voltage, and any hygienic certification requirement.
A diverter valve is a routing switch for product: one line in, a choice of lines out (or the converging mirror image). Unlike an isolation valve it usually operates with product present, often hundreds of times a day, so the specification questions are about the product's behaviour — how it flows, how it wears, whether it can contaminate the other leg — more than about pressure containment.
A blade pivots inside a Y- or K-shaped housing to blank one outlet. Simple, compact, economical, easy to line for wear, and the default for gravity chutes and dilute-phase conveying. Their weakness is the seal line around the blade: standard designs leak a little to the closed leg. Inflatable-seal versions solve this — after each switch, an elastomer seal inflates around the blade edge, giving near-tight segregation for allergen and multi-recipe plants.
A rotary plug diverter turns a drilled plug so a smooth full-bore passage aligns with the chosen outlet; there is no blade in the flow, pressure loss is minimal and closed-leg sealing is good, which makes it the choice for positive-pressure and dense-phase pneumatic conveying to roughly 3.5 bar. Tunnel and slide diverters translate a sliding section for heavy-duty gravity applications in minerals and cement.
For liquids, L-port and T-port ball or plug valves route product between destinations; sanitary divert valves in 316L with polished bores serve dairy, beverage and pharma, and hygienic builds can follow 3-A and EHEDG design practice where audited.
Match the body to the product: aluminium for light powders, cast iron with replaceable polyurethane or hardened liners for abrasives, stainless 304/316 for hygiene and corrosives. For strongly abrasive media, wear happens at the blade edge and outlet throats; ask what liners and spares are available rather than assuming the casting alone will last.
Pneumatic double-acting cylinders with solenoid valves and open/closed proximity switches are the plant standard; specify air pressure available, solenoid voltage and whether switching happens under flowing product. Manual lever versions serve infrequent switching.
Diverters are low-pressure equipment relative to process valves — conveying lines rarely exceed a few bar — and connect by flanges, compression couplings or welded stubs matched to the conveying pipe standard. There is no dedicated product standard for conveying diverters; hygienic versions reference 3-A and EHEDG, and where a project insists on pressure-boundary references, ASME B16.34 materials practice applies.
Product and its properties (bulk density, particle size, abrasiveness, dust explosivity, hygiene class), conveying mode and pressure, line size, port count and angles, orientation, body and liner materials, seal type, closed-leg tightness requirement, actuation details, switching frequency, certification needs, quantity and delivery. Indian fabricators supply diverters in all these formats and export routinely with test and material certificates.
A diverter valve has exactly two legitimate states per outlet — selected or blanked — and it must move between them decisively. Everything in the design serves three goals: present a clean flow path to the selected outlet, keep product out of the unselected outlet, and survive the product's abrasion and the duty's switching frequency.
The pivoting blade forms one wall of the selected passage and the closure of the rejected one. In gravity service the product stream mostly falls past the blade; in dilute-phase conveying the gas stream bends around it, costing a modest pressure drop at the elbow the blade creates. Fine powders migrate past the blade's perimeter clearance into the closed leg — a few grams an hour, irrelevant in a cement plant, unacceptable in an allergen-segregated food plant. That is the whole case for inflatable seals: the blade switches with clearance (low wear, low actuation force), then the seal inflates at 4 to 6 bar air and closes the clearance completely until the next switch. The control sequence matters — deflate, switch, re-inflate — and the supplier's solenoid and timing package should enforce it.
The drilled plug is effectively a piece of pipe that rotates. Selected, it presents an uninterrupted bore, so dense-phase slugs pass without the impact and fallout a blade edge would cause, and conveying pressure is preserved — significant when the blower is sized against every tenth of a bar. Blanked, the plug's solid face closes the other port against differential pressure. Wear concentrates where the bore edges sweep the housing; hardened plugs, replaceable sleeves and abrasion-resistant coatings are the countermeasures for minerals duty.
Switching on the fly — with product moving — imposes the hardest duty: the blade or plug must shear through a product stream, the actuator must not stall mid-travel (a half-switched diverter sends product to both legs), and position switches must confirm full travel before the control system believes the route changed. If your process requires on-the-fly switching, state it; the manufacturer will upsize the cylinder, strengthen pivots and may recommend a brief conveying pause instead for severely abrasive media.
An L-port ball rotates 90 degrees to connect the common port to either outlet, passing through a momentary dead point; a T-port can bridge both outlets during transit, which either usefully avoids pressure spikes or dangerously cross-connects lines depending on your process — choose the port pattern deliberately. Sanitary divert valves add crevice-free bodies and seat designs that clean in place.
The recurring ones: blade edge and liner wear opening leak paths; product packing into the closed leg and jamming the next switch (worse with hygroscopic or fibrous materials — specify purge connections); actuators sized for an empty housing stalling against settled product after a shutdown; inflatable seals cycled without deflating, tearing in months; and proximity switches drifting so the plant loses route confirmation. Each is preventable at specification time, which is why the enquiry should describe the product and the switching regime honestly rather than just the pipe size.
Padamade Private Limited
