Applications
Ultra low power pilots with flapper-nozzle technology have been designed to be mounted on pneumatic solenoid valves. They are used mainly in explosive atmospheres or industries where harmful substances are present.
These include:
- Chemical industries
- Pharmaceutical industries
- Oil and gaz refineries
- Industries subject to the ATEX Directive
- Functional safety environments, ...
Flapper-nozzle technology
The pilot (1) is supplied with air at pressure P1 (the supply pressure of the valve). The pressure reduces to P2 as it passes through the orifice and then out through the nozzle (2). All the while P2 is below the lower threshold of the pilot the spool will not move. On voltage, the flapper (3) moves closer to the nozzle, restricts the air being exhausted and pressure P2 increases. As the pressure reaches and passes the threshold of the pilot the spool (4) moves and enables air to pass from the (5) valve supply port (available with NPT or connection) and through the valve.
Flapper nozzle technology relies on a constant drain of air through the nozzle with a consumption <0,3Nm³/h
Features
Reduced Power Consumption
- Pilot with ultra low power consumption of 30 mW
Enhanced Process Safety
- Zone 1 product certified to the ATEX Directive
Universal solution
- Safety parameters are compatible with all barrier manufacturers
Long life with high reliability
- Reliable product and proven pilot technology (Flapper nozzle) for industrial process.
5M cycles for valves with Namur interface,
25M cycles for the tapped version
Characteristics
| Pilote | Valve | ||
| Voltage: Power: Consumption I: P: Ambient temperature: Protection: Pilot body: ATEX : |
16 to 40 V CC 0,03 W 2.5 to 6.7 mA 40 to 270 mW -40 to +80/+50°C according to temperature class IP65 PBT reinforced (thermoplastic polyester) II 2G Ex ia IIC T5/T6 (category 2G zone 1) |
Body: Pilot end: Spool: Screw: Connection: Function: NAMUR Interface |
aluminium PBT Delrin Stainless steel 316L Tapped & Namur; G1/4 & 1/4NPT 3/2 ? 5/2 monostable & bistable 1-3-5 ports on the same side |
Documentation
- Spool valve series 551, function 3/2, G1/4 tapped connection with ultra low power pilot
- Spool valve series 551, function 5/2, G1/4 tapped connection with ultra low power pilot
- Spool valve series 551, functions 3/2, 5/2 or 5/3, with NAMUR interface and ultra low power pilot