Proportional valve for pressure control uses requiring a constant flow: these include glue and lacquer dosing, pressure control of welding equipment, and flow control over nozzles.

Asco Joucomatic's Pulstronic proportional valve is designed for pressure control applications requiring a constant flow: these include turbine speed control, glue and lacquer dosing, pressure control of welding equipment, and flow control over nozzles. 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 DN05 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'.

Typical applications where the Pulstronic provides an optimised control solution include: compensation of thickness on pinch rollers; spot welding; turbo-supercharging and materials testing.

In pinch roller applications, Pulstronic controls the pressure acting against the top roller (in a series of two), ensuring that the thickness of the processed material remains constant.

Similarly, in spot welding the Pulstronic valve controls the pinching force of the welding head depending on the material to be welded and its thickness.

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

Finally, in material testing the Pulstronic continuously increases the force acting against a test piece until the latter is destroyed.

* Free Proportional Technology Catalogue - further information regarding the Pulstronic, Sentronic D, Piezotronic and Asco Joucomatic's complete range of proportional valve products is contained within a new 25- page catalogue produced by the company.

The publication provides all relevant information regarding proportional technology and devotes four pages to application examples, each with its own accompanying graphic.

Free copies of the catalogue are available from Asco Joucomatic's marketing department.