1. Explosion-Proof Chemical Dosing Sequence Control
In a petrochemical plant operating under ATEX Zone 1 conditions, this time delay valve is used to sequentially open a secondary solvent valve exactly 15 seconds after the main catalyst valve opens, purely through pneumatic signals without requiring vulnerable electrical timers.
Problem SolvedEliminates the need for expensive and bulky explosion-proof electrical enclosures by providing precise 0-30s adjustable pneumatic delays in hazardous environments.
ATEX Zone 1Adjustable delay time 0-30s0-10 bar operating pressurePneumatic logic control
2. Combustible Dust Filter Purge Delay
Installed in a flour milling facility classified as ATEX Zone 21, the valve controls a reverse-pulse jet cleaning system. It delays the shutoff of the purge air by 10 seconds after the milling cycle ends, utilizing its 600 l/min flow capacity to clear residual dust from the filter bags.
Problem SolvedPrevents combustible dust accumulation in silos by ensuring a sustained post-cycle purge, while maintaining strict compliance with Zone 21/22 explosion protection standards without electrical components.
ATEX Zone 21600 l/min standard nominal flow rateCompressed air ISO 8573-1:20100-30s adjustable delay time
3. Automated Part Ejection Sequencing in Metal Stamping
Utilized in an automated metal stamping line operating at standard 6 bar shop air pressure. The VZOB-3-1/4 delays the actuation of a pneumatic part ejector cylinder by a few seconds to ensure the press ram has fully retracted before ejection.
Problem SolvedPrevents mechanical collisions and tooling damage between the retracting press and the ejected part by enforcing a strictly timed, purely pneumatic mechanical delay sequence.
0-10 bar operating pressureG1/4 pneumatic connection0-30s adjustable delay timeVDMA24364-B2-L LABS (PWIS) conformity
