Proportional valve comes in four versions
An
Asco Numatics product story
Edited by the Engineeringtalk editorial team
Mar 20, 2006
Self-contained, electro-pneumatic proportional valve with an integrated control loop that provides precise regulation of pressure is for operation on normal filtered air.
Asco Joucomatic's Pulstronic proportional valve is for pressure control applications requiring a constant flow, including 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.
For operation on normal filtered air (50um), Pulstronic uses poppet technology - as used on the Sentronic proportional valve - to provide good rates of response with hysteresis below 1% of maximum output pressure (PMR) when increasing or decreasing pressure.
Repeatability is 0.5% of PMR (10bar).
The IP65-rated unit comes in four versions - the DN4 with G1/8 ports, the DN7 with G1/4, the DN12 with G1/2 and the DN05 with instant fittings to accept 4mm flexible hose.
The last on the list is 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.
Applications include compensation of thickness on pinch rollers, spot welding, turbo-supercharging and materials testing.
In pinch roller applications, it 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 valve controls the pinching force of the welding head depending on the material to be welded and its thickness.
In turbo and supercharging applications, it adjusts exhaust gas flow to the turbo-supercharger, depending on the engine speed, to maintain the charging pressure at a constant level.
In material testing, it continuously increases the force acting against a test piece until the latter is destroyed.
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