A compact single-stage Venturi ejector — the dominant industrial vacuum generator type — can be sourced from MISUMI Thailand at ฿371.64 (≈US$10.50) for a silencer-equipped PISCO cartridge, while the upper end of the same catalog reaches ฿9,787.75 for an SMC multi-stage silencer-integrated unit [S3].
The catalog page dated 2026-06-05 lists 39 silencer-equipped vacuum generators/ejectors from SMC, PISCO, CHELIC, MYOUTOKU and MISUMI own brand, with lead times ranging from same-day to 29 days, and a price adjustment effective 1 July 2026 announced on the same page [S3]. Rotary vane vacuum generators (positive-displacement oil-sealed pumps) are priced and sized on a completely different axis — flow in m³/h and motor kW — with 48 industrial manufacturers offering 456 products on the DirectIndustry index, led by BECKER (72 SKUs) and Busch Vacuum Solutions (49 SKUs) [S2].
Two Principal Hardware Classes and Their Price Logic
Industrial vacuum generators split into two economically distinct families: pneumatic Venturi ejectors and rotary vane (oil-sealed or dry) vacuum pumps, and the cost drivers barely overlap between them [S1][S2]. A Venturi cartridge has no electric motor, no moving wear parts beyond the nozzle/diffuser, and its bill of materials is dominated by the body (aluminium, PBT plastic, or anodised aluminium manifold), the integrated silencer (option), and any solenoid/pilot valve package — IO-Link adds a measurable but small premium [S1].
The MISUMI Thailand price ladder for silencer-equipped pneumatic units shows the spread clearly: ฿371.64 to ฿548.00 for the cheapest PISCO single-stage silencer cartridges, ฿482.80 to ฿2,856.85 for SMC mid-range units with solenoid valves, and ฿6,720.95 to ฿9,787.75 for SMC high-flow or multi-stage silencer-integrated modules [S3]. Rotary vane generators, by contrast, scale with flow rate and ultimate vacuum: the Becker VT 4.2 (1.9–2.3 m³/h, 0.09 kW, 400 mbar) sits at the bottom of the rotary ladder, the Becker VT 4.8 reaches 8–9.1 m³/h at 0.37–0.44 kW, and the Busch R5 RA 0840 A PLUS delivers 440–840 m³/h at 18.5 kW with 0.1 mbar ultimate vacuum — typically a five-figure US-dollar unit [S2].
Cost Drivers: What Moves the Price on a Pneumatic Venturi
Five variables dominate the price of a vacuum generator of the Venturi/ejector type, and each can be observed directly in the MISUMI Thailand price ladder [S3]. Stage count: single-stage cartridges cluster at ฿371.64–฿1,295.00, two- and three-stage modular units (Gimatic EJ-MEDIUM, EJ-LARGE, EJ-BA) climb into the ฿1,500–฿9,000 band per the DirectIndustry spec sheets [S1]. Ultimate vacuum depth: deeper vacuum (−90 to −94 kPa class on the EJ series, 0.1 mbar on Busch R5 rotary units) requires tighter nozzle tolerances and more stages [S1][S2].
Integrated silencer: PISCO silencer cartridges carry a ฿371.64–฿8,985.28 price band versus non-silenced equivalents, with same-day ship availability on the cheap end and 11-day lead on premium silenced modules [S3]. Pilot/solenoid valve package: a vacuum generator with integrated 2/2 or 3/2 solenoid valve and IO-Link (Coval, GIMATIC, SMC ZK2-class) typically adds 30–80% over the bare cartridge price [S1]. Brand premium: in the same MISUMI listing, PISCO and CHELIC silencer cartridges (฿371.64–฿1,295.00) sit 40–60% below equivalent-spec SMC units (฿482.80–฿9,787.75) at the same flow class [S3].
Rotary Vane Generators: Cost per Cubic Meter per Hour
For oil-sealed rotary vane vacuum pumps, two OEMs dominate the index and set the price benchmarks: Becker and Busch [S2]. Becker's VT series is the dry-running, self-lubricating graphite-vane line: VT 4.2 (1.9–2.3 m³/h, 0.09 kW, 400 mbar) is the entry point, VT 4.4 (4.1–4.7 m³/h, 0.18–0.21 kW, 150 mbar) is the mid-tier, and VT 4.8 (8–9.1 m³/h, 0.37–0.44 kW, 150 mbar) anchors the small-plant rough-vacuum duty [S2].
Bushc's R5 RA series extends the same architecture to industrial flows: R5 RA 0025 F (25–40 m³/h, 1.0–1.4 kW, 0.1 mbar), R5 RA 0040 F (40–48 m³/h, 1.4–1.7 kW, 0.1 mbar), and R5 RA 0840 A PLUS (440–840 m³/h, 18.5 kW, 0.1 mbar) — each step roughly doubles flow and price [S2]. The Pfeiffer Vacuum Duo 1.6/M (1.5 m³/h) and Duo 3/M/DC (2.9 m³/h) add a magnetically-coupled, oil-leak-free variant for analyser integration, typically commanding a 20–40% premium over sealed-shaft equivalents for the elimination of conventional shaft-seal leakage [S2].
Comparison: Venturi vs Rotary Vane on Selection Criteria
On four decision criteria a buyer can score the two families [S1][S2][S3]: Purchase price — Venturi wins: ฿371.64 to ฿9,787.75 catalog band, no motor [S3]; rotary vane typically an order of magnitude higher per kW installed [S2]. Ultimate vacuum depth — rotary vane wins: 0.1 mbar achievable (Busch R5), versus roughly −90 to −94 kPa (−900 to −940 mbar) for multi-stage Venturi cartridges [S1][S2]. Continuous-duty robustness — rotary vane wins: designed for continuous operation in the rough/medium vacuum range with self-lubricating graphite or fibre-reinforced epoxy vanes, while Venturi units need filtered dry compressed air and reach thermal limits above ~60 °C [S1][S2]. Footprint and integration — Venturi wins: cartridge masses of 2.4–189 g (GIMATIC EJ-MEDIUM/EJ-LARGE/EJ-BA series) and inline or T-shape mounting directly at the gripping point, versus a rotary vane pump that needs a motor, baseplate, exhaust line and often an inlet trap [S1].
Total Cost of Ownership: Air, Vane Wear, and Maintenance
The cheapest Venturi on the MISUMI list is not always the cheapest over a service life. A pneumatic vacuum generator consumes compressed air continuously when the vacuum is held, and that air cost — plus dried-air filtration to ISO 8573-1 classes — frequently exceeds the purchase price within 12–24 months in 24/7 pick-and-place cells. A Vortex-cooler or ejector with a 50 NL/min air consumption running two-shift will burn through several thousand cubic metres of compressed air per year, where the silent cartridge itself cost ฿371.64 to begin with [S3].
Rotary vane pumps trade compressed-air cost for vane-replacement cost. Becker specifies self-lubricating graphite composite vanes for oil-free operation, with replacement intervals typically every 6,000–15,000 operating hours depending on inlet dust load and water-vapour exposure; Busch R5 uses fibre-reinforced epoxy resin vanes with a similarly service-interval-driven cost model [S2]. The Busch R5 RA 0840 A PLUS (18.5 kW, 840 m³/h peak) is a process-vacuum class unit where the electric bill dominates TCO — at industrial electricity tariffs, energy alone can exceed the capital cost inside 18–30 months of continuous duty [S2].
Where the Vacuum Generator Catalog Sits in the Pneumatic Stack
On the MISUMI Thailand pneumatic catalog the silencer-equipped vacuum generator SKU cluster sits in the M3402000000 category and is configured alongside cylinders, solenoid valves, and air-preparation units that share the same brand and lead-time tiers [S3]. The same-day-ship SKUs cluster at PISCO and the lower end of SMC (฿378.25 to ฿1,587.80), and lead time stretches to 18–29 days only on the high-flow multi-stage silencer-integrated modules above ฿6,000 [S3].
For a pneumatic valve actuator buyer evaluating whether to spec an ejector vacuum versus a mechanical vacuum pump, the decision typically hinges on duty cycle, ultimate vacuum level, and contamination tolerance — a brief cross-walked against the Vacuum Generator vs Pneumatic Actuator spec map and the Pneumatic Cylinder buying guide can save a mis-spec. Buyers building a complete pick-and-place cell will also be sizing pneumatic valve actuators and solenoid coils in the same vendor quote, so the silencer-cartridge price band (฿371.64 to ฿9,787.75) should be benchmarked against the vacuum gauge instrumentation, the FRL/filter train, and the downstream solenoid coil cost to capture the full pneumatic-stack spend per station [S3].
The next two trackable signals for buyers: the 1 July 2026 MISUMI Thailand price adjustment noted on the catalog page, and the 18–29-day lead-time SKUs in the SMC silencer-integrated high-flow tier — both should be confirmed against the live quote on the next sourcing cycle [S3].