Key Features
✓ Automatic mechanical condensate drain
✓ Float-operated automatic discharge
✓ No electrical supply required
✓ No solenoid valve or timer required
✓ Drains only when condensate collects
✓ Minimises compressed air losses
✓ Suitable for systems up to 16 Bar
✓ Pressure tested to 20 Bar
✓ 1/2" BSP connection
✓ Optional NPT thread available
✓ Aluminium alloy construction
✓ Stainless steel internal components
✓ Suitable for oil/water condensate
✓ -10°C to +80°C temperature range
✓ Simple vertical installation
✓ Low maintenance mechanical design
✓ Large UK stocks available
✓ Free next working day UK delivery
1/2" BSP Mechanical Condensate Drain Valve 0–16 Bar
£37.10
incl. VAT
£30.92
ex. VAT
-40% Was £61.81 incl. VAT
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Description
1/2" Mechanical Condensate Drain Valve – Automatic Float Drain
The ZLDV-12 mechanical condensate drain valve provides fully automatic removal of condensate from compressed air systems without requiring electrical power, timers or solenoid valves.
Using a mechanical float-operated discharge system, the valve opens automatically when accumulated condensate reaches the required level and closes again after discharge. Unlike timed drains that operate at fixed intervals, the ZLDV-12 drains only when condensate is present, helping minimise unnecessary compressed air loss and energy consumption.
Designed for pressures up to 16 Bar, it is ideal for air compressors, receivers, refrigerated and adsorption dryers, filters, moisture separators, aftercoolers and compressed air distribution systems requiring reliable automatic condensate drainage.
Function & Operation
Function: Automatic mechanical condensate drain
Operation: Float-operated discharge valve
Working principle: Mechanical float lever
Installation: Vertical mounting
Connection: 1/2" BSP
Optional thread: NPT
Maximum working pressure: 16 Bar
Pressure test: 20 Bar
Operating temperature: -10°C to +80°C
Construction & Materials
Body: Aluminium alloy
Float: High-strength polymer
Internal components: Stainless steel
Seals: NBR
Media
Condensate
Compressed air
Water
Oil
Oil/water condensate
How the Mechanical Float Drain Works
Condensate entering the drain collects inside the valve chamber and causes the internal float to rise.
When the condensate reaches the discharge level, the mechanical float mechanism opens the drain valve and automatically releases the accumulated liquid.
As the condensate level falls, the float lowers and the drain closes again, helping prevent unnecessary loss of compressed air.
No electrical supply, timer programming or external control system is required.
Mechanical Float Drain vs Timer Drain
A mechanical float drain operates according to the actual condensate level rather than at predetermined time intervals.
Mechanical Float Drain
✓ Drains when condensate is present
✓ No electrical supply required
✓ No timer adjustment required
✓ Minimises unnecessary air discharge
✓ Automatically adapts to condensate load
Electronic Timer Drain
✓ Drains at predetermined intervals
✓ Adjustable ON and OFF periods
✓ Suitable for predictable drain cycles
✓ Electrical supply required
✓ Digital programming available
This makes the ZLDV-12 particularly suitable where condensate levels vary and automatic demand-based drainage is preferred.
Typical Applications
Air compressors
Compressed air receivers
Refrigerated air dryers
Adsorption dryers
Coalescing filters
Compressed air filters
Moisture separators
Aftercoolers
Compressed air distribution systems
Industrial pneumatic equipment
Condensate collection vessels
Benefits
✓ Fully automatic condensate removal
✓ No electrical wiring
✓ No timer programming
✓ No solenoid coil to energise
✓ Reduced unnecessary air discharge
✓ Low operating costs
✓ Simple installation
✓ Low maintenance requirements
✓ Reliable continuous operation
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