Consider the joint operation of a control valve and a manual balancing valve in a traditional coil pack. We have two devices that regulate flow: a control valve and a manual metered balancing valve/orifice, commonly referred to as a circuit setter.

The coil pack is an essential part of a petrol engine's ignition system and even a minor problem, made more likely by the cold temperatures found in winter, demands a visit to a trained car mechanic - who is likely to charge a minimum of pounds 200.

The Switching Networks (SN) are used at every pulse for plasma initiation in each of the Central Solenoid coil packs, and in the circuits of the PF Coils 1 and 6.

Developments are continuing to service the irrigation pipe markets where point-of-sale labels can be automatically secured at the coiling stage, whilst coil packs can be formed starting at 180 mm ID.

The AA discovered all four spark plugs and the two coil packs were loose, so whoever had fitted the plugs had not used enough torque.

It also includes a number of mounting holes for rails and coil packs.