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Air Compressor

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FAQs

Direct-drive units are smaller, lighter, and cheaper — well-suited to intermittent use, mobile applications, and where the compressor sits beside the operator (despite higher noise). Typical duty cycle 50-60%. Belt-drive units are larger and heavier but quieter, longer-lived, and rated for higher continuous duty (70-80%) — the workshop default for permanent installations and continuous-tool use. For a fleet workshop running impact wrenches, sanders, and paint guns daily, choose belt-drive; for mobile and occasional use, direct-drive is fine.

Receiver size is sized to your tool-use pattern. For continuous high-flow tools (sanders, sandblasters, large paint guns), a larger receiver buys you continuous flow without the pump short-cycling — typical workshop size 100-200 litres. For intermittent tool use with peak demand spikes (impact wrenches, brad nailers), the receiver buffers the spike — 50-100 litres is often enough. As a guide: receiver size in litres ≥ 4 × maximum CFM demand. The receiver capacity is listed on every compressor product page.

Displacement CFM is the theoretical air the pump moves at zero pressure — a marketing-friendly number. Free-air-delivery (FAD) CFM is the actual air the compressor delivers at working pressure, accounting for pump efficiency and pressure losses — the number that matches your tool's air requirements. Always size by FAD CFM, not displacement. The trade brands (SIP, Nuair) publish FAD figures honestly; FAD is also the figure listed on every compressor product page in this range.

Single-phase 230V covers compressors up to about 3 kW / 4 HP (typical max free-air delivery around 14 CFM). Above that, three-phase 400V is required — providing smoother running, better motor efficiency, and longer motor life. If you have three-phase supply available in your workshop and need a compressor above 3 kW, three-phase is always the better choice. The phase requirement is listed on product pages; never run a three-phase compressor on a phase converter without specifying it.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Piston Compressor

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Within Compressors, Piston Compressor covers the workshop and trade-grade reciprocating-piston air compressors — the most widely-used compressed-air technology for workshops, fabrication shops, plant-yard operations, and trade installations. Parts For Machines supplies piston compressors across the wide selection from compact 25-litre direct-drive units up to industrial 270+ litre belt-drive twin-stage compressors for heavy workshop and production use. Parts For Machines is an Authorised Distributor and Seller of SIP and Nuair across the piston compressor range.

SIP is the dominant brand here, with the broadest line covering both the entry-level Airmate range and the professional-spec Industrial range (with cast-iron pumps, larger receivers, and thermal-protection switches). Nuair extends the range with Italian-built compressors covering trade and light-industrial use, with the Nuair B range a workshop favourite. Sealey covers smaller direct-drive units suited to mobile and intermittent use; Draper extends entry-level and trade options.

Compressors split into two main configurations. Direct-drive compressors run the pump directly from the motor at full speed — compact, lower-cost, but louder and lower duty cycle (typically rated 50-60% duty). Belt-drive compressors run the pump at lower RPM via a belt and pulley — quieter, longer-life, with higher duty cycle (typically 70-80%) and better suited to continuous workshop use. Product pages list rated output (in CFM or L/min, free-air-delivery measured at working pressure), maximum pressure (typically 10 bar / 145 PSI for trade units, up to 14 bar for industrial), receiver capacity (in litres — the buffer tank between the pump and the user), motor power (in kW or HP), drive type (direct or belt), phase (single-phase 230V or three-phase 400V), and noise level (in dB at 1 metre).

For workshop use, size the compressor's free-air-delivery to the highest-consuming tool you'll run continuously, with at least 25-30% margin for duty-cycle and air-system losses. For intermittent tool use, the receiver smooths the demand — a larger receiver lets a smaller pump cope with bigger tools used briefly. Trade pricing on multi-unit and workshop fit-out orders is available; contact the team via WhatsApp 07754288583.

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FAQs

Direct-drive units are smaller, lighter, and cheaper — well-suited to intermittent use, mobile applications, and where the compressor sits beside the operator (despite higher noise). Typical duty cycle 50-60%. Belt-drive units are larger and heavier but quieter, longer-lived, and rated for higher continuous duty (70-80%) — the workshop default for permanent installations and continuous-tool use. For a fleet workshop running impact wrenches, sanders, and paint guns daily, choose belt-drive; for mobile and occasional use, direct-drive is fine.

Receiver size is sized to your tool-use pattern. For continuous high-flow tools (sanders, sandblasters, large paint guns), a larger receiver buys you continuous flow without the pump short-cycling — typical workshop size 100-200 litres. For intermittent tool use with peak demand spikes (impact wrenches, brad nailers), the receiver buffers the spike — 50-100 litres is often enough. As a guide: receiver size in litres ≥ 4 × maximum CFM demand. The receiver capacity is listed on every compressor product page.

Displacement CFM is the theoretical air the pump moves at zero pressure — a marketing-friendly number. Free-air-delivery (FAD) CFM is the actual air the compressor delivers at working pressure, accounting for pump efficiency and pressure losses — the number that matches your tool's air requirements. Always size by FAD CFM, not displacement. The trade brands (SIP, Nuair) publish FAD figures honestly; FAD is also the figure listed on every compressor product page in this range.

Single-phase 230V covers compressors up to about 3 kW / 4 HP (typical max free-air delivery around 14 CFM). Above that, three-phase 400V is required — providing smoother running, better motor efficiency, and longer motor life. If you have three-phase supply available in your workshop and need a compressor above 3 kW, three-phase is always the better choice. The phase requirement is listed on product pages; never run a three-phase compressor on a phase converter without specifying it.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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