Janatics DS3 Series NAMUR Pneumatic Solenoid Valve, 3/2 Way Normally Closed, G 1/4" Port, 24V DC Coil with Connector, DS345SR61-W

ASCO (Emerson) SCG551A001MS.24/DC

ASCO Series 551 spool valve, NAMUR version, G1/4 (leaflet 00552GB)

ASCO (Emerson) SCG551A001MS.24/DC. Series 551 NAMUR spool valve, G 1/4 (ISO 228/1), 6 mm orifice, 2 to 10 bar, single solenoid with spring return, screw-type manual operator, 24 V DC. ASCO builds this as a combined 3/2 normally closed and 5/2 valve: the NAMUR interface plate is fitted for the function the actuator needs, so this one catalogue number covers the 3/2 normally closed duty. Points to check before ordering. Rated flow is 700 l/min on the ASCO against 1400 l/min on the Janatics; ASCO publishes its figure at 6 bar without stating the pressure drop it is measured at, while Janatics publishes 1400 l/min at 6 bar inlet with a 1 bar drop, so confirm stroke time on the actuator rather than treating the two numbers as directly comparable. Exhaust ports 3 and 5 are G 1/8 on the ASCO against G 1/4 on the Janatics, so silencers, exhaust throttles and exhaust protectors do not carry across. The manual operator is a screw type on the ASCO where the Janatics is push and lock. The 24 V DC coil draws 2.5 W hot and 3 W cold on the ASCO against 5 W on the Janatics. The ASCO is rated -25 to +60 degrees C against 5 to 60 degrees C for the Janatics. Supply port thread, NAMUR mounting interface, the DIN 43650 form B connector with a gland for 6 to 8 mm cable, IP65 and coil insulation class F are the same on both.

Parker Hannifin 331N03-496482C2

Parker Pneumatic (Parker Lucifer) NAMUR valve range G1/4, series N03/N05 with 22 mm coil

Parker Hannifin 331N03-496482C2 — G1/4 NAMUR 3/2 normally closed pilot-operated spool valve, 22 mm safe-area coil supplied with its DIN 43650 form B (Pg9) plug, 24 V DC. Cross-referenced on valve function, NAMUR 1/4" interface, port size, coil voltage, coil width and connector form. Temperature is the difference to check first: the ambient and medium range here is 5 °C to 60 °C, while Parker rate the 331N03 medium down to 0 °C in the range catalogue (1101/UK) and down to -10 °C in the Fluid Control general catalogue (FCDE/0110/UK), with coil ambient -10 °C to +50 °C. This valve is therefore not rated for service below 5 °C, though it is rated 10 °C higher at the top, to 60 °C against Parker's 50 °C. Coil power is 5 W against Parker's 3 W. Nominal flow is 1400 L/min against Parker's 1250 L/min, both measured at 6 bar inlet with a 1 bar pressure drop, and the working pressure range starts at 2 bar against Parker's 2.5 bar minimum differential. Construction also differs: Parker's 331N03 is a dedicated 3/2 body, while this valve is the 5/2 body with a 3/2 adaptor plate. Both deliver 3/2 normally closed on the NAMUR 1/4" interface.