An electro-pneumatic proportional valve is designed for applications requiring a cost-effective variable pressure regulation.

Pulstronic, a new pneumatic proportional valve from ASCO Joucomatic, is designed for applications requiring variable pressure regulation. Developed from ASCO Joucomatic's unique Sentronic proportional valve, Pulstronic offers a cost effective solution where the levels of response required by a particular application are not extreme. Pulstronic is a self-contained, electro-pneumatic proportional valve with an integrated control loop that provides precise regulation of pressure.

Designed for operation on normal filtered air (50 micron), Pulstronic employs ASCO Joucomatic's innovative poppet technology - proven on the market leading Sentronic proportional valve - to provide good rates of response with minimum hysteresis (< 1% of maximum output pressure (PMR), when increasing or decreasing pressure.

In addition, repeatability is excellent at 0.5% of PMR (10bar).

The IP 65 rated Pulstronic is available in four versions: the DN4 with G 1/8 ports, the DN7 with G1/4, the DN12 with G 1/2 and the DN 0.5 with instant fittings to accept 4mm flexible hose.

The latter version is particularly adapted for piloting pneumatically operated valves or boosters.

All the valves operate with analogue set points of 0-10v, 0-20mA or 4 - 20mA, and offer operational security in the form of a 'pressure held at power failure function.' A typical list of applications for the Pulstronic includes: * Compensation of thickness on pinch rollers - The pressure acting against the top roller (in a series of two) is controlled by Pulstronic, ensuring that the thickness of the processed material remains constant.

* spot welding - The Pulstronic valve controls the pinching force of the welding head depending on the material to be welded and its thickness.

* Turbo-supercharging - The Pulstronic adjusts exhaust gas flow to the turbo-supercharger, depending on the engine speed, to maintain the charging pressure at a constant level.

* Material testing - The Pulstronic continuously increases the force acting against a test piece until the latter is destroyed.