DN300 Programmable Logic Controller: Advanced Industrial Automation Solution
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What is the DN300 valve assembly?
Note on the listing title: the queue titles this article a "Programmable Logic Controller" — the part is a valve, and DN300 is not a controller model but the nominal diameter: 300 mm, cast right into the valve body. This is a pneumatically actuated wafer-pattern butterfly valve built for dust service: a cast aluminium body holding an orange epoxy-coated disc on twin shafts, driven through an ISO mounting bracket by a Jiangyi JYC101 rack-and-pinion pneumatic actuator (90° rotation, 4-7 bar supply, -20 to +80 °C), with a solenoid valve for the open/close signal and a position indicator box whose transparent cover reads OPEN and CLOSED over a red-green dial. The accessories label on the indicator says it plainly: "BUTTERFLY VALVE FOR DUST PROOF" — this is the isolation damper for dust-collection and pneumatic-conveying lines, where a 300 mm bore has to slam shut on entrained powder. One assembly, new, 30 kg as recorded. All 11 photos and 1 video below show this exact valve.
Part details
| Field | Value |
|---|---|
| Nominal size | DN300 — 300 mm bore ("DN300" cast into the body) |
| Type | Wafer-pattern butterfly valve, dust-service (indicator label: "BUTTERFLY VALVE FOR DUST PROOF") |
| Body | Cast aluminium, wafer flange pattern, twin-shaft disc |
| Disc | Orange epoxy-coated, closes against the body seat |
| Actuator | Jiangyi JYC101 rack-and-pinion pneumatic actuator — 90° travel, supply 4-7 bar, -20 to +80 °C (Jiangsu Jiangyi Industrial Automation Co., Ltd.) |
| Controls fitted | Solenoid valve, position indicator box with OPEN/CLOSED dial, quick-connect air fittings supplied loose |
| Mounting | ISO-pattern bracket between valve and actuator |
| Quantity | 1 assembly, new as recorded at intake |
| Shipping weight | 30 kg as recorded |
Values are read from the body casting, the actuator label and the indicator-box label in the photo set.
Why a dust-line damper is built this way
A butterfly valve in a dust line does a harder job than its water-line cousin: the disc closes into a seat that powder has been settling against all shift, and it must still seal. The wafer body handles the mechanical side — clamped between the pipe flanges, the short face-to-face keeps a 300 mm valve light enough for one fitter to handle, which matters at the 30 kg this assembly records. The epoxy-coated disc closes against the full body seat, and the twin-shaft layout spreads the actuator torque across both sides of the disc so a trapped dust bed does not skew it. The JYC101 rack-and-pinion actuator is the standard quarter-turn drive: 4-7 bar of plant air through the solenoid snaps the disc open or shut in under a second, the open/closed indicator shows the position from across the room, and the travel stops inside the actuator set the 90° exactly so the disc never batters the seat. In a dust-collection network these dampers are the isolation points — between a hopper and its filter, before a fan, at a duct junction — and when one fails it is usually the seat or the seals, both reachable without cutting the valve out. As an assembly — valve, actuator, solenoid, indicator and fittings matched and mounted — it drops onto the flange pair and wires to the PLC in minutes.
Photos and video
All images below are original KOEED warehouse photos. Click any photo to view it full size.
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