Compressor Drain Valves
Air Compressor Automatic Drain Valve G1/2 | 230VAC Solenoid | Timer Controller
TBS-08980AIRC-00090
£52.99
Compressor Drain Valves
7 products available
An air compressor drain valve removes condensed water from the receiver tank, so moisture doesn't build up and corrode the vessel from the inside. This category covers the air compressor automatic drain valve and the simpler manual types used on workshop, plant and mobile compressors. It's aimed at maintenance teams, workshop managers, contractors and OEM service engineers who need a reliable way to clear condensate without relying on someone remembering to open a tap.
Compel's range here is narrow and focused. We stock a small selection of compressor drain valves rather than a wide catalog, so the guide below helps you confirm the right type before you order. A working water drain valve on an air compressor protects the tank, the air line and the tools downstream. Check the listing for port thread, pressure rating and mounting details, then buy from a supplier that serves trade accounts and ships against a purchase order.
7 products in Compressor Drain Valves
Products
Compressor Drain Valves
Air Compressor Automatic Drain Valve | M15.5 x 1.5 Thread | 0.2 to 0.8MPa
TBS-08976AIRC-00087
£68.99
Compressor Drain Valves
Air Compressor Automatic Drain Valve | 1/2" DN15 Brass | Timer Solenoid
TBS-08970AIRC-00084
£77.99
Compressor Drain Valves
Air Compressor Drain Valve Kit | 25cm Braided Hose | 1/4NPT Brass
TBS-08870AIRC-00052
£60.99
Compressor Drain Valves
Air Compressor Automatic Drain Valve | 1/2" DN15 | Timer | Brass
TBS-08815AIRC-00033
£124.99
Compressor Drain Valves
Air Compressor Drain Valve | 1/4 BSP Brass | Tank Blowdown Valve
TBS-08804AIRC-00030
£24.99
Compressor Drain Valves
Air Compressor Drain Valve | 1/4 BSP Brass Drain Cock | T-Handle
TBS-08731AIRC-00004
£25.99
Choosing between manual and automatic compressor drain valves
A manual drain valve is a tap or ball valve on the tank outlet. It's cheap and simple, but it only works if someone opens it on schedule. Skipped drains let water collect, and wet air then reaches tools and process equipment.
An air compressor auto drain valve removes the human factor. Common automatic designs include float-operated, timer-controlled and solenoid-operated types. Each one clears condensate without an operator standing by the machine.
- Manual: lowest cost, suits light or occasional use where drain checks are reliable.
- Float-operated: opens when condensate reaches a level, with no power needed.
- Timer or solenoid: opens at set intervals, needs a power supply, and suits tanks that run long hours.
- Check the listing for the operating principle before you buy.
Matching the valve to your compressor tank and connection
Fit comes first. Confirm the thread size and type on your tank's drain port, and check whether the valve screws straight in or needs an adapter. A mismatch here is the most common reason for a returned part.
Then compare pressure. The valve's working pressure rating must cover the compressor's maximum output pressure, not just its normal running pressure. The listing gives the rated pressure for each valve. If the datasheet doesn't state it, ask before you order rather than assume.
- Port thread size and thread standard
- Maximum working pressure of the valve versus your compressor
- Body material, such as brass or plastic, as listed
- Supply voltage for powered types, if applicable
Installation position, discharge and common mistakes
Fit the drain valve at the lowest point of the receiver, where condensate collects. A valve mounted higher up leaves a pool of water below it. Route the discharge to a safe, suitable drain, since the water often carries compressor oil and shouldn't go straight onto the floor.
Don't treat an auto drain as maintenance-free. Condensate carries scale and oil, and debris can hold a valve open or stop it sealing. Inspect and clean it as part of routine servicing, and check that it still closes fully under pressure.
Buying guide
Choosing Compressor Drain Valves
- How do I choose an air compressor automatic drain valve?
- Match the port thread to your tank, confirm the pressure rating covers your compressor's maximum pressure, then pick the operating type. Float-operated valves need no power, while timer and solenoid types need a supply. Check the listing for each of these details before ordering.
- Will a compressor auto drain valve fit my existing tank?
- It will if the thread size and thread standard match your tank's drain port. Check the existing fitting first. If the threads differ, you'll need a suitable adapter, so confirm the thread on the product listing before you buy.
- When should I fit a compressor automatic drain valve instead of a manual one?
- Fit an automatic valve where the compressor runs for long periods, runs unattended, or serves process equipment that can't tolerate wet air. A manual valve suits light, occasional use where draining is done reliably. If drains get missed, switch to automatic.
- Can I fit a water drain valve on an air compressor without depressurising it?
- No. Isolate the compressor and release stored air before removing or fitting any drain valve. The receiver holds stored energy, and a valve removed under pressure can eject violently. Follow the compressor manufacturer's procedure.
- How often should a compressor drain valve be checked?
- Inspect it as part of routine servicing and more often in dusty or humid conditions. Look for blockage, weeping or failure to close, since scale and oil in condensate can foul the seat. Clean or replace the valve if it won't seal.
- What mistakes do people make with a drain valve compressor setup?
- The usual errors are choosing a valve with too low a pressure rating, mounting it above the lowest point of the tank, and ignoring thread compatibility. Another is dumping oily condensate on the floor. Fit at the lowest point, check the rating and route the discharge safely.